The term “polymer” or plastics refers to a rather simple concept, which can be easily explained with some simplified chemistry…
From commodity plastics all the way to high-performance plastics, we have tested them all. Read into our adventures with those different materials.
What can possibly make 3D printing even more fun and captivating? A variety of filaments you can use to bring ideas to life! That why making your own filament is convenient and fun. Just in case you still have a hard time grasping the value in filament making – No problem, here are some points to guide you.
If you’ve worked with the 3D printing long enough, you may have felt a glint of disappointment regarding the lack of the materials you wish to try in your projects. Of course, color changing, and glowing filaments are fun, just like the super-flexible ones, but creators need more potential and more appliance possibilities for their final printed items. And this is the exact reason to consider making your own 3D filament instead of purchasing the ready-made one.
We don’t know about your experience, but we face the defective filament too often to blame it on the coincidence. Different thickness, fragility, lamination – all of these low-quality 3D filament features can ruin your project, or even become a cause of your 3D printer’s breakdown.
Customization – creating your material with the required properties – can eliminate all these listed problems. And here are the reasons, why.
- Filament extruder allows controlling all features of the produced filament. Thanks to the built-in thickness meter, possibility to customize all the stages of granules heating, multiple sensitive sensors, the filament you’ll get will have the identically perfect properties without any thicknesses or thinnings, overburnt sections, cavities.
- You can combine different materials in order to get entirely new blends. When the standard assortment of filaments satisfies you neither with quality nor with characteristics, you’re able to experiment with different types of plastic granules, additives, tweaking compounds to obtain something brand-new for your projects.
When making your own printing material using a 3D filament extruder, you’re controlling the future of filament.
Let’s say you need less than a kilo of the Bio PE, but don’t want to wait several days before the delivery? Simply extrude whatever amount of 3D filament is required at the time it’s needed!
A home-made filament is convenient because:
- You make the needed amount of the printing material and don’t have to keep dozens of half-empty spools you’ve used once and not going to try anymore.
- The filament will not be stored in improper conditions. Sunlight, temperature change, high humidity damage the structure of the filament making it inapplicable for printing. But when you create it on-the-go and then immediately use it for craft, you get the best quality without any odd material remains.
- No need to order filament from unreliable sites. Every time you buy 3D filament on the Internet you rely on luck – its quality is quite hard to predict unless you’re shopping from your trusted manufacturer. Then again, having a filament extruder, the printing material you’ll be using in the craft will pass your quality test, so the prints will always be up to your standards.
- Have filament when you need it. Don’t count days before delivery – your perfect 3D filament is always within reach!
Let’s look at the price of the spool of the regular black PLA filament. You won’t find a decent material cheaper than $17 per 1 kilogram. This price, apart from the raw material price, includes the cost of the manufacturing (electricity, heat, industrial workstation, employees paycheck), shipping, storage, and seller’s extra charge.
Comparing the price of the ready-made PLA with the PLA pellets, you will see an unbelievable variation of prices: 1 kilogram of the most expensive PLA granules costs $5. Thus, when you buy filament pellets instead of manufactured spools you save around $12 per kilogram.
Of course, a quality filament extruder will cost money, and you absolutely don’t need it if 3D printing is your part-time hobby. In this case, you may never pay off the cost of the equipment, and the purchase will only leave you with a hole in your pocket.
However, if 3D printing for you is something more than making models of your favorite cartoon characters, we’d recommend thinking about buying a filament extruder to fulfill your demands.
We all know how often 3D printing process becomes interrupted by different issues – from a jammed nozzle to an accidental warping. You stop the machine, fix the problem and start printing again, but what about the plastic the printer has already used?
In many 3D workshops, such wasted material is collected for the re-using needs. The concept is simple:
- Collect defected plastic
- Clean and let it dry
- Put it into the special plastic shredder
- Manufacture the filament from the plastic granules using filament extruder
Such a scheme not only saves you a sufficient amount of money but also protects nature from redundant plastic pollution. Benefiting all sides of the ecosystem.
Filament extruders, on the top of all these advantages, are a promising source of income. You can freely share it with the other people for the additional price. Cost of the granulated plastic – even summarized with the charge for your services – won’t excel the price of the spooled filament. This way you’ll have a source of the passive income, and your extruder won’t stand idly when you won’t need it.
In addition, we’ve already discussed how you can use the extruder in order to experiment with the materials. Other 3D printing fans will appreciate a close-by source of cheap qualitative filament, so your extruder will have less chance to cool down!
To buy or not to buy a 3D filament extruder
This is not your option if you’re absolutely fine with the filament you buy from the manufacturer, as well as if you turn on 3D printer once a month. Still, when printing is your primary occupation, filament extruder is an excellent investment in your printer’s well-being and your creative freedom. Defective printing material is our collective nightmare, and an efficient extruder can really change a situation with filaments for better.
Do you want to know the latest news from the 3D printing world? Do you know why PEI is one of the coolest printing materials available on the market? Or what you can do with PETG filament? Well, you’ll find all the answers in our 3devo blog. Don’t miss an opportunity to learn something cool!
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Why are filaments so expensive and what you can do about it?
When buying filaments for your 3D printer, a common question may come across your mind – Why are these things so expensive? After all, it’s only a piece of plastic, right?
Yes, but there is more to 3D filaments than what meets the eye! We invite you to explore with us some of the factors which affect the price of a filament. We shall immerse ourselves in the basics of filaments and what it costs to get them from the manufacturer to your home. In addition, we will offer several secrets that will help you reduce the cost of filaments without sacrificing quality.
3D printer filaments are made of various polymers, which is the technical name for various ‘plastics’. Polymers are chains of repeating segments of molecules. The most common ones include ABS (a co-polymer of acrylonitrile, butylene, and styrene) and PLA (polylactic acid). We invite you to learn more about them in the following article. Never less, 3D printing may utilize almost any polymer, if it has the following properties.
It may be remolded when heated – Essential for 3D printing.
It can be “stretched out” when heated – Though it must not “leak” once it has been set.
It is durable when cooled down – This property can be enhanced or compromised based on your project.
The quality of a filament is determined by these properties. Additionally, you may require further special abilities for a specific product, such as flexibility (nylon), weather resistance (ASA), or outright strength (polycarbonate). In the graphic below, you can see which materials are the superheroes in their respective categories.
The cost of a polymer plays the main role in the overall price of the filament. Each comes from a different source and requires various techniques to prepare.
Quality of a polymer can also be reduced by impurities, which are common when it is prepared by cheaper methods. I can testify to this with my own experience. Even though I have been at first pleased to find cheap filaments on some e-commerce websites, I have always ended up with low-quality products, that leaked, cracked, smelled bad, etc.
Let’s talk about a less mentioned, yet very important part of filaments – the additives! The color of filaments alone suggests that they contain something more than just pure plastic. It is fascinating to explore the variety of enhancements that can be included in a filament and the effect that they have on its price.
The most common additive is a dye. Dyes vary wildly in quality – factors such as color, solubility, UV resistance, and toxicity can play a role in their price. This is the case especially for fluorescent dyes which glow in dark, or UV active dyes which glow under UV light.
Additives can also improve the physical properties of the product. A very important example is hardness, which can vary wildly even when we consider a single type of polymer. This is achieved by adding only small amounts of a necessary additive. But it’s by far not the only property that we can introduce!
Other common additives include flame retardants and autoxidizing agents. The small amount of additives does not impact the stability of the polymer, yet it expands the possible applications of 3D printed products. How cool is that?!
3. Processing, packaging and a niche market
Let’s take a look at a less technical topic, which is an issue of both quality and quantity. The processing of polymers into filaments is not necessarily expensive, but it requires special equipment to achieve their uniform dimensions. You may have already found that out the hard way, since cheap filaments often end up getting stuck in the printer. The use of expensive specialized equipment necessary for precise extrusion will be reflected in the price.
After extrusion, the filament is cut, packaged and sold not in bulk, but in single threads. It is necessary to wind every single filament onto a plastic spindle, which is called spooling. The spool adds to the weight quite a bit, which increases the amount of fuel required to ship them. It is also inefficient since the rolled up filaments contain a lot of air. This contributes to the price as well.
We must also account for the size of the market. This is the concept known as the rule of supply and demand. 3D printing is a fast growing, but still a niche market. This means that there aren’t many filament manufacturers, especially ones who would sell high quality products. The demand is increasing, but the production is expensive and low in volume – think of Tesla cars as another example. Thus, the manufacturers can ask for more money than for other polymer products, such as plastic spoons.
Tips – How to reduce the cost of a filament
From the reasons we have given, it may seem that compromising on the price of a filament will most likely result in a bitter surprise – and you would be right! Still, there are ways to get around this. Here are is a brief overview of the top 5 tips to lower 3D printing costs.
- Buying in bulk is always cheaper than by single spools. You may buy multicolor sets, or simply order a wholesale package of filaments.
- Read reviews, recommendations and compare prices. Thanks to the internet, we have all the information at our disposal!
- Make sure to plan your project thoroughly. Not only that you will not overpay for unnecessarily expensive polymers, but you will end up using less.
- Consider extruding your own 3D filaments from granulates. As seen in the table below, filaments are far more expensive than granulate they are made from.
- Recycle your products. This requires specialized equipment that reduces plastic products to granulate.
|Material||Filament price/USD per kg||Granulate price/USD per kg|
( Comparison of popular filament and granulate prices can be found here )
Material, additives and production costs all add up to the final market value. But don’t worry; we have also given you several ways to reduce the cost of your 3D printing operation! Still, there is so much more to 3D printing! Be sure to check out further articles on our blog to learn more about specific types of filaments, extruders and recycling.
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Meet the brand-new Precision and Composer series
These past few months have been exciting here at 3devo. We looked into everything that made our filament makers a success, and everything that could make them better. Now we’re proud to announce two new-and-improved series of products. Here’s a first look at the Precision Series and Composer Series filament makers. These latest devices make working with materials simpler than ever, offering even more possibilities in manufacturing and innovation.
Focused on better results
Our NEXT filament maker found numerous amounts of applications in industries ranging from education and research to manufacturing and aerospace. They brought users a variety of benefits including shorter lead times, reduced material waste, and increased control over material making. Also, they facilitated material research and customization, while introducing the precision of industrial filament making to desktop-based setups.
However, we realized that our filament makers could serve these purposes even better – if they focused on specific requirements. Our new Precision and Composer Series filament makers are specialized, result-oriented machines aimed at simplifying the material making process. Each in a different way.
The Precision Series filament maker
The Precision series enables mass production of 3D printing filament with improved speeds and diameter accuracy. With a high-flow extruder screw, this allows filament to be produced at high speeds while also maintaining diameter precision.
The Composer Series filament maker
The Composer series targets material mixing and experimentation, allowing innovators to develop custom filament from a wide variety of polymers and additives. With a mixing screw, this delivers quality material mixing and compounding.
Both series have two additional models that address material-specific requirements. The Precision 350 and the Composer 350 can handle temperatures up to 350°C, allowing them to comfortably process polymers including PLA, ABS, PC, PS, PETG, TPU, TPE, PPS, PA (6,12,66) along with others. The Precision 450 and the Composer 450 have higher temperature tolerances (up to 450°C), which means they can additionally process high-performance polymers like PAEK, PSU, PTFE, PVDF and more.
Find out more about choosing the perfect 3devo filament maker.
It’s what’s inside that counts
Our new filament makers contain numerous upgrades and improvements to deliver even better results. Here is what we improved:
Every Precision and Composer model has an improved extruder system with an innovative ‘swappable’ design. We’ve designed the entire extruder system – extruder screw, barrel, die-head, motor and heaters – as an independent, removable unit to simplify cleaning, repair and maintenance. Disassembling and reattaching this unit is a quick and simple process that users can now manage on their own.
Advanced heating system
Efficient temperature handling is central to high-quality filament extrusion. To this end, we’ve upgraded the heating system. All Precision and Composer filament makers now contain ceramic band heaters with 4 controllable heating zones. Each heater is handcrafted in-house to ensure top-of-the-line quality. Giving you complete control over the extrusion process. To further improve filament quality, all machines have hoppers with closeable caps to prevent material contamination.
In addition to their enhanced design and build, our new-generation filament makers have upgraded software that improves their thermal stability by up to 35%.
Stay in the loop
We’re also in the works of developing a web app with cloud access, which will enable active data logging of extrusion tests. But that is a topic for a future post, so stay tuned! In the meantime, learn more about our Precision and Composer series here.
Recycling. A word often related to large companies receiving tons and tons of paper or plastic in an effort to reduce…
Last year saw a huge surge in the varieties of different 3D printing materials. However, with the world’s focus on saving the environment, not many are coming from biological sources. Even though 3D prints can be recycled into other 3D prints, it is not a zero-sum outcome. With the increase in biological materials though, the end result would be just carbon dioxide and water. In this article we focus on one of these biological materials – Bio PE – and if it can be extruded using our filament extruder.
Bio PE Summary
By definition, bio-plastics and biopolymers are the type of plastics and polymers which come from renewable biomass sources. These sources include: vegetable oils, sugarcane, starch and wheat grain. Depending on the products; the global bio-plastics market includes bio-PET, starch blends, PLA, bio-PA, bio-PE and others. Bio PE, or biopolyethylene, is simply polyethylene made out of ethanol. After a dehydration process, it becomes ethylene using these biomass sources. The final product is polyethylene, which properties mimic those of conventional polyethylene.
The main application for biopolymers is packaging, which makes up around 28% of the total volume shown in 2016. This includes shopping bags, food packaging, bottles and many other uses. Other uses include blow-molded hollow parts such as automotive fuel tanks, injection molded parts, tubes and other applications used in the automotive and consumer-goods industries.
Advantages & Disadvantages
According to Braskem, the world-leading supplier of bio-PE, a production rate of 200 kilo ton/year of bio-PE would require approximately 450 million liters of ethanol. This would utilize 65 million hectares of Brazilian sugar cane land to produce enough sugar to enable Braskem’s production capacity. This represents 0.02% of the Brazilian arable land. Clearly, the impact to the sugar cane food supply is quite small.
Another great advantage is that the chemical structure, applications, and recycling are identical to fossil-fuel based PE. Also do not forget that Bio PE is 100% recyclable.
All these advantages do come with one main drawback. Currently, the price of bio-PE is about 50% higher than fossil-fuel PE. In upcoming years though it should see a decrease in price when volumes increase.
Extruding Bio PE + TMP + MAPE
Here at 3devo we were able to acquire some Bio Polyethylene (PE) SHD 7255 LSL, including 20% thermomechanical pulp (TMP) and 6% maleated polyethylene (MAPE). Take note this is just a short summary of our testing. Please visit our contact page for more information.
Preparation and Extrusion
Cleaning the Next filament extruder has been very important. Either a purging compound or HDPE can be used. Drying the materials was also critical. After 7 hours of drying the material doubled in moisture content over 48 hours (stored in a closed container with silica gel), it was finally ready. Three tests were conducted, using various temperatures and settings. It was interesting to see how quickly the material heated up, and fast fan cooling was vital it to handle more stress. Low temperatures also helped improve the results.
After multiple tests, we conclude that Bio PE + TMP + MAPE combination can be successfully extruded with the Next. Some issues include the TMP particles causing the material to get easily torn apart and the ease at which the material heats up. Cleaning also determines the best results for the final filament.
In the end, bio-plastics and biopolymers are definitely something to focus on in the future of 3D printing. Their unique characteristics make it great for sustainable development. Also now that extruding materials like this is possible, it will be great to see what upcoming projects will be rolling out in the years ahead.
PEI, Polyetherimide, is one of the more rare polymers we have tested here at 3devo. That, however, does not mean it is any less useful. This high performance engineering thermoplastic, usually with an amber to transparent colour, makes a great name for itself in various high-demanding applications. It can often replace metal or other strong substances thanks to its impressive chemical and mechanical properties, but how well does it extrude? In this article we will make a brief overview of PEI as well as our extrusion tests for this strong polymer.
PEI’s characteristics include extreme rigidity, high strength (even at elevated temperatures), long term heat resistance, dimensional stability and good electrical properties. It is easy to spot due to its light amber colour (unfilled) and is usually semi-transparent. Like other amorphous, high temperature resins, PEI has outstanding dimensional stability and is inherently flame retardant.
PEI does resist chemicals, such as hydrocarbons, alcohols and halogenated solvents. Creep resistance over the long term allows PEI to replace metal and other materials in many structural applications. It is also widely used in electronics because of its good arc resistance and dielectric constant. Furhermore, PEI is UFDA/USDA and USP class VI compliant.
- Reusable machined components
- Aircraft/Automotive instrumentation
- Plastic Manifolds
- Electrical insulators
- Electrical component housings
- Great thermal stability (continuous use temperature of 365F/180° C)
- High strength
- Continuous rigidity and strength to 340F (170°C)
- Dimensionally stable
- Excellent flame and heat resistance (UL 94 V-0 rated)
- Consistent dielectric properties over a range of frequencies
- Good acid resistance
- High resistance to autoclave sanitizing
- Low moisture absorption
- Can withstand steam autoclaving
- Inherently flame retardant
- Certified Grades for food-contact and bio-compatibility applications
- Can be expensive
- Not a lot of colour choices (amber or sometimes transparent)
Extruding PEI (ULTEM 1010 Resin)
Here at 3devo we were able to acquire some PEI for extrusion tests (Ultem 1010 Resin was used). Because of its high strength factors we were interested to see what the results would be. Below is an overview of the whole process, however, for a more detailed report please contact us via the sales contact page.
First cleaning of the extruder had to take place. Using ASACLEAN™ GL2, followed by ASACLEAN™ PX2, we were able to clean the device to prevent any impurities impacting the results. Once both materials had run through the device in order to properly clean it, the heaters were all set to the same temperature (160 °C).
There are three important things to look out for when extruding new filament for the first time:
- How does the filament look? Are there any signs of bubbles/holes, die lines, weld
lines, melt fracture or warpage?
- Is the flow similar to that of standard PLA (when using the same rpm)?
- Is it possible to pull the material without any trouble (the material does not stick to
the puller wheel and does not break as a result of the force of the puller)?
After multiple tests, we concluded that PEI is able to be successfully extruded with the NEXT. The tests we ran determined that PEI should be extruded below 370 °C (but not too low) in order to prevent bubbles and holes from forming, and that proper cleaning methods should be used in order to determine the best results.
In the end, PEI was a very interesting polymer to test out compared to other ones we have tested in the past. Its high strength, rigidity and thermal stability meant that a lot of care had to be taken when running the tests. PEI though is a great filament and very useful, especially in aerospace and automotive applications.
Zortrax is a name renowned for precision engineering. Most famous for their exclusive line of 3D printers, namely the M300 and M200, creating high quality prints with ease. However, Zortrax also shine in their range of filaments. These all boast great qualities and are ideal for a range of uses from prototypes to decorative elements.
We soon decided to focus on one of their more popular filaments: Z-ULTRAT. Therefore, we wanted to see how well it would extrude, and what use it could be for you or your business.
The Z-ULTRAT is no ordinary filament, designed purely for its own Zortrax M200 3D Printer. Its main features (high hardness and durability) make it great for prototyping mechanical parts, architectural models and design prototypes. Below are its key features:
|Name||Z-ULTRAT 3D Printing Filament Cool Grey 1.75mm 800g|
|Printing technology||LPD (Layer Plastic Deposition)|
|Dedicated device||Zortrax M200 3D Printer|
|Weight||1 kg (2.2 lb) gross wt. / 800 g (1.76 lb) net. wt.|
|Efficient melting point for 3D printing||269 – 279 °C [516 – 534 F]|
|Glass Transition Temperature||144 °C [291 F]|
|Vicat Softening Temperature||130 °C [266 F]|
|Hazards||Product does not present any hazard while operating|
For more information visit the official Zortrax Z-ULTRAT page.
While these are all good features, it is not so easy for extrusion. Especially when comparing it to PLA. The next step will look at testing how well the filament extrudes using our filament extruder.
Extruding Z-ULTRAT 3D Printing Filament
The Regular NEXT 1.0 was used for the tests, and was set to 220 °C across all three sections. The purpose for using the regular extruder as opposed to the Advanced version, is due to the extrusion screw of the model. It has been previously observed that the Regular screw, lacking the pineapple mixing station, is generating more pressure. Better nozzle flow is a result of this.
The machine is pre-loaded with HDPE. This is to ensure the extrusion barrel and screw are clean and performing at an optimum level upon receiving the Zortrax ABS. In order to remove all contaminants, the machine was left to run HDPE for an hour. The filament was added after this step.
Numerous tests were completed using different settings in order to achieve industry-standard results. Below is a graph showing off the stability over time:
In the end, the filament became stable at: 1- 275 / 2- 280 / 3 – 270 at speeds of 5rpm.
The filament produced better results after changing the speed to 5rpm, with only slight deviations (still within 100 microns) over 35-40 minutes. As a result, the test was a success. This was because a thickness of 1.75mm is not easy to extrude, as more control is needed. Also noted that ABS is harder to extrude when compared to other filaments such as PLA.
The Zortrax range of 3D printers and filaments offer fantastic end results. Mechanical parts, casing elements for testing and even consumer and educational product prototypes – all are possible, with complimentary colours to go with. Furthermore, you have the option of recycling your prints after you are done. This means both businesses and printing enthusiasts alike will be able to take full advantage of these great products.
Here at 3Devo, we really enjoying testing a variety of different filaments. Last week we were about to test some PAEK. As you may or may not know, PAEK is a family of semi-crystalline thermoplastics with high-temperature stability and high mechanical strength. We were lucky enough to test some AvaSpire AV-621 from Solvay (provided by ALBIS PLASTIQUE France). Catchy name, but is it any good? This article will cover all you need to know about PAEK, and how it performed in our tests.
As mentioned PAEK, or polyaryletherketone, is a family of semi-crystalline thermoplastics. In this family you will find:
- Polyetherketone (PEK)
- Polyetheretherketone (PEEK)
- Polyetherketoneketone (PEKK)
- Polyetheretherketoneketone (PEEKK)
- Polyetherketoneetherketoneketone (PEKEKK)
Polyaryletherketone (PAEK) was first prepared in the early 1970s, but results and the overall process was somewhat limited. PEEK was the first thermoplastic to go large scale in 1977, where ICI used polyetherification reactions to create the polymer. In 1981, Victrex of Lancashire, England, introduced PEEK resins commercially. Next came PEK, introduced by BASF AG, the large German plastics company, which attempted to gain the total market share, eventually stopping all production of PEKEKK resins. This left Victrex as the only supplier of PEK resins in the world.
In the end, PEEK’s growth rates started to soar, mainly due to its high mechanical strength and chemical resistance. From vehicles, to aircrafts, to most electronics and medical applications, more and more suppliers started to enter the market. These suppliers include:
- Victrex (UK)
- Solvay Speciality Polymers (Belgium and US)
- Panjin Zhongrun High Performance Polymers (China)
- Jida Evonik High Performance Polymers (China)
Below is a list of some of the advantages and disadvantages of using PAEK:
- Highly fire-resistant
- Good chemical resistance
- Can be used for high temperature applications
- Excellent mechanical and dielectric properties
- Relatively high cost material
- High temperature molding and extrusion required
In our first attempt to create PAEK filament we used the AV-621 NT grade produced by AvaSpire with a melting point of 340°C, which we pre-dried at 150°C for 4 hours. The first step in the extrusion process was using PX2 cleaning purge (with a temperature range of 280-420°C) as a transition material, in order to be able to raise the temperature of all heaters to 380°C.
The first thing we noticed while extruding with an overall temperature of 380°C, was the large amount of air bubbles in the filament. This could mean two things, either the granulate was not dry enough, or the overall temperature is too high. Lowering the overall temperature by 10°C improved the quality a lot, but now we faced nozzle lip buildup as you can see in the picture below:
Some polymers tend to have this problem, and it causes major surface roughness of the filament. In this case, the buildup was reduced by increasing the temperature of the front heater.
In the end we managed to create a spool of PAEK with a filament thickness of 1.75mm, but the surface of the filament was still on the rough side. This means we will keep on looking for better settings of the Next Advanced Extruder, but at least the machine has now proved its ability to create PAEK filament. This adds up in the list of successfully tested high-end polymers, along with materials such as PEEK and PEKK.
Here at 3Devo we really enjoy trying out new polymers. Most of them have different functions and qualities that make them unique. This week we had a look at PEKK, or Polyetherketoneketone. This semicrystalline polymer, shows off both a sound structural performance in high temperature and a strong chemical resistance. These positive qualities make it very useful in various fields, from medicine to aerospace.
Before 2011, PEKK’s main use was for the production of thermoplastic composites. It was sold in limited quantities to a few small compounding companies. These companies offered PEKK in various melting processes, as well as other specialty and composite processes. However, in 2011, Arkema began industrial PEKK production making it more accessible, so let us take a closer look into what makes this polymer so unique.
- PEKK is a part of the High Performance of Polyaryletherketone (PAEK) polymer family.
- Glass transition temperature of 162°C (323.6°F)
- The melting temperature for the PEKK homo-polymer is around 400°C
- Slow crystallization rate
- Manufacturers and distributors: Arkema, Velox, RTP and Cytec
- Brand names: Kepstan and RTP
PEEK vs PEKK
Unlike PEEK, PEKK displays both amorphous and crystalline material properties. This makes PEKK quite interesting. Thanks to its unique mechanical, physical and chemical properties, PEKK lends itself to a broader range of uses than PEEK:
- Up to 80% greater compression strength than PEEK
- Wider processing window of parameters than PEEK
- High strength and toughness
- Chemical resistance
- Easy processing
- Lower moulded-in stresses
- Greater dimensional stability
- Remains transparent even at higher operating temperatures
- Improved flow characteristics (due to an extremely slow rate of crystallisation)
According to Tim Spahr of Arkema’s Corporate Research in North America, “These properties allow for lower processing temperatures and the ability to process the Kepstan® 6000 Series (one of their products) copolymers polymers as either amorphous or semi-crystalline structures, depending on processing technologies and cooling conditions.” He also added, “They can be injection molded and extruded as an amorphous polymer without the need for quenching.”
Oxford Performance Materials, always popular with their advances in developing of applications, are now using PEKK to improve infections related to artificial hips, knees, and other implanted devices. In February 2014, OPM became the first company to receive FDA clearance. This was for the manufacturing of patient-specific 3D printed polymeric implants for a line of cranial prosthesis as shown above.
NASA is also not wanting to be left out of the 3D-printing world. They of course have many projects that involve 3D printing, but last year a 3D printed part received a lot of attention as part of their latest ICESat-2 project. The project aims to examine and measure changes in ice-sheet elevations, sea-ice thicknesses, and global vegetation in Greenland and the Antarctic. Stratasys had to develop a bracket for this project for the sole purpose of space travel. PEKK made its debut in space as part of the satellite, allowing for this central bracket component to be only the second 3D printed part to go into space so far.
The military will also be using PEKK’s heat and chemical resistance and its ability to withstand heavy mechanical weights for various uses out in the field. For example, a plastic guard that prevents light emitted from a flashlight from exposing a soldier’s location.
Our Tests with PEKK
We decided to use a bag of the Kepstan® 6000 series copolymers, as it offers offer a low melting point and has a slow crystallization rate. We used the Kepstan 6001 PF variant.
Like PEEK, the transition material played a key role throughout the PEKK extrusion process.
This time we used a different high temperature purging compound: Asaclean PX2 grade (280 Celcius up to 420 Celcius), to reach the desired temperature range for PEKK (330 Celcius up to 345 Celcius).
By pressure feeding the PEKK powder in the hopper of the Advanced Level Extruder, the cooling fans at 30% and the screw speed at 7RPM, we had a good time with the unique filament. Successfully we extruded 2.85mm, which will be tested any time soon by one of our clients. PEKK offers a lot of advantages to say PEEK or other polymers, but it truly stands out in real-world applications. Hopefully more industry sectors can see the potential of this useful polymer.