买再生PEEK最怕什么？
不是耐温不够。这东西熔点343℃、连续使用250℃、除了浓硫酸浓硝酸几乎什么都不怕，天生就是个硬核选手。
最怕的是分子量掉了。PEEK的核心卖点之一是分子链又长又稳，每经历一次热加工循环分子量就降10%到20%，三次标准回收之后拉伸强度典型降8%到12%——客户拿件去测，强度差了一截，回头说你偷工减料。你还没法当场反驳——因为耐温那块料确实没缩水，是回收那一遭把分子链搞短了。
做半导体CMP保持环的、做压缩机耐磨活塞环的、做汽车变速箱轴承保持架的，谁没被看着是好料、打出来不对这种事坑过。
这篇把再生PEEK的性能脾气和颜色门道讲透：哪些性能循环之后还稳得住，哪些性能一回收就打折，颜色又为什么直接决定它能干什么活。看完再下单，至少心里有本账。
原生Victrex 450G的底子先摆出来：密度1.30克每立方厘米，在特种工程塑料里算匀称；熔点343℃，玻璃化转变温度143℃，连续使用温度约250℃；拉伸强度约100兆帕，弯曲模量3.8吉帕；简支梁缺口冲击约5.0千焦每平方米，断裂伸长率25%到50%；吸水率24小时约0.05%，泡水里尺寸也不怎么飘；天然UL94 V-0，最薄1.5毫米壁厚就达标，不用加任何阻燃剂。
说白了，这东西天生耐温、耐磨、阻燃，是个六边形战士。
那再生料呢？好消息和坏消息各一条。好消息是，分子量掉归掉，拉伸强度基本保留——再生样实测还能拉到90兆帕上下，降幅有限。坏消息是，缺口冲击掉得比强度明显，延展性跟着垮。
记住这个不对称：拉伸性能循环后扛得住，冲击性能循环后扛不住。再生PEEK选型，本质就是在这两者之间算账。
Tm343℃和连续250℃是金字招牌
343℃这个数字，是PEEK吃饭的本钱。
先把一个认知纠偏：PEEK是半结晶材料，有明确的熔点。它不像PEI和PPSU那些无定形透明料那样只有玻璃化转变温度、没有熔点，而是在343℃这个点突然熔化。所以它能常年在250℃连续干活，短期能扛300℃。
对比一下就懂：PEI的连续使用温度大约170到180℃，PPSU大约180℃，PEEK高出一大截。这就是它在航空结构件、半导体CMP保持环、井下工具这些高温场景里被点名的原因。
代价也有：要把这东西加工出来，料筒温度得拉到360到400℃，模具温度170到200℃还是强制的——模温不够，结晶度上不来，件一出来尺寸就飘。普通注塑机料筒根本吃不下这个温度，得上专用料筒。这就是金字招牌的另一面：能耐多高的温，加工就得受多大的罪。
分子量掉得比头发还快
耐温这块招牌结实，但分子链这东西，回收一回就短一回。
原理不复杂：PEEK每次熔融加工都在360到400℃的高温区间，加上空气里的氧气，芳香环和醚键酮基被热氧老化一点点剪断。链一短，分子量下来，熔体流动性就往上走。拉伸因为还能靠链间作用力撑着，三次回收后典型降8%到12%；但冲击不一样——冲击测试考的是链段能不能在高速形变下缠结吸能，链一短，缠结点少了，缺口冲击就往下掉，比拉伸掉得明显。
这里有个坑得提前说清楚：这个每循环分子量降10%到20%、三次回收拉伸降8%到12%，是PEEK专属数据，不能套到别的品种头上。工业上，PIR边角料以25%到75%配适当填料体系可以维持可接受的力学性能；为了稳性能，常拿30%到50%原生新料掺混再生料做refresh。但有一条红线：医疗植入件和半导体洁净级，法规上禁用任何再生料——这不是商量，是底线。
佛山有家做压缩机耐磨活塞环的客户，之前图便宜拿国内凑的再生PEEK，每批料的缺口冲击从4.2飘到2.8千焦每平方米，打出来的活塞环装机后跑不到500小时就异常磨损，三个月里连续退了两批货，退货率干到8%。后来换成从东南亚进口的固定料源——本色未填充水口料和黑色耐磨级水口料分开收，进口料源颜色可控、本色料源充足，每车附分子量和拉伸检测报告，拉伸稳在90兆帕以上，缺口冲击稳在4.0千焦每平方米以上，退货率压到0.5%。
说白了，进口料源颜色可控、本色料源充足、性能稳定，落到量产线上就是耐磨件不用每批重做台架、不用拿整批货去赌寿命。
颜色是再生PEEK的第二张脸
再生PEEK的颜色，直接决定它能干什么活。
天然浅棕琥珀色是本色未填充树脂的天生颜色，也是最贵的一档——本色PIR水口料成分单一、清洁度高，稀缺性溢价；黑色是加碳黑调色的，遮盖力强、料源广，耐磨轴承级常用；碳纤增强的是黑色，高强度高刚性；玻纤增强的是浅灰偏白，高刚性。
本色未填充级为什么最稀缺？因为PEEK在高温下加工，分子难免热氧老化，颜色会一步步加深——从浅棕到黄、到褐、到黑，而且这个变色是不可逆的。你拿反复回收的本色料去打外观件，颜色根本压不住。本色纯树脂和玻纤增强料之间那档价差，很大一部分就是为本色两个字付的溢价。
变色机理不复杂：高温多次加工加上热氧老化，分子链上生成发色团，再加上杂质一点点累积，颜色就越来越深。还有一个特别要注意的点——PEEK对污染极敏感，任何黑点、碳酸钙、杂料掺进去都会在最终零件上形成黑点，Victrex官方都明确提示过这个问题。
这里有个朴素逻辑：做外观件、要本色的，别指望反复回收的料；做内部耐磨件、不怕黑的，黑色料更划算。颜色选对了，省的是配色成本和换色折腾。
耐磨自润滑和耐化学是最后的倔强
如果说耐温是PEEK的招牌，那耐磨和耐化学就是它的底线。
PEEK分子链上芳香环和醚键酮基交替排列，结构本身就又硬又韧，摩擦系数低，耐磨寿命远优于尼龙和石墨尼龙。做轴承保持架、齿轮、活塞环这些要反复摩擦的地方，它是常客。
耐化学这一项更是硬核：耐绝大多数有机溶剂、酸碱、油类，唯独被浓硫酸、浓硝酸等强氧化剂侵蚀。耐水解耐蒸汽这一项同样能打——可以承受134℃蒸汽反复灭菌超过1000次性能无明显下降，这是它能进医疗和食品领域的关键。介电性能也稳定，宽温宽频下都不怎么飘，做电子连接器、线圈骨架这些要绝缘的地方都认它。
但有个绕不开的坑：高温加工带来的颜色加深是不可逆的。你要做浅色、本色件，反复回收的料颜色根本压不住。所以行业里再生PEEK大多走黑色——用黑把色差盖住，眼不见为净。这就是为什么高端医疗件和半导体洁净件宁愿选原生本色，再生料老老实实去做黑色遮盖的耐磨结构件。耐磨和耐化学是分子给的本钱，颜色加深是回收环节绕不开的代价。
四个细分方向，一句话讲清
高耐温级：主打343℃熔点和250℃连续使用温度，做长期耐热的航空替代件和半导体设备结构件。
高耐磨补韧级：回收后分子量下降冲击变差，靠掺混比例和填料把缺口冲击稳在可用区间，做轴承、齿轮、活塞环。
天然阻燃级：不靠阻燃剂、本色V-0，做对阻燃烟毒有要求的电子电气和连接器骨架。
耐化学级：耐绝大多数酸碱溶剂油类，耐反复蒸汽灭菌，做化工密封件和医疗器械配件。
写在最后：七条选料口诀
1. 盯耐温：熔点343℃、连续250℃，这是PEEK的本钱，别拿普通工程塑料替代；
2. 盯分子量：每循环降10%到20%，三次回收拉伸降8%到12%，冲击掉得比拉伸明显；
3. 盯掺混：PIR配填料可掺25%到75%，常拿30%到50%原生新料refresh稳性能；
4. 盯颜色：天然琥珀本色稀缺最贵、黑色量大价低，按外观要求选；
5. 盯黄变：高温加工颜色加深不可逆，本色件别反复回收；
6. 盯耐磨耐化学：低摩擦、耐溶剂、耐千次蒸汽是分子给的本钱；
7. 盯红线：医疗植入和半导体洁净禁用再生料，这条别碰。
写在最后：再生PEEK的性能账，本质是耐温耐磨扛得住、分子量冲击扛不住这本账。343℃熔点和250℃连续使用温度是它天生带的本钱，循环之后照样立得住；分子量是回收环节容易断的那根筷子，掺混掺得准不准，直接决定你量产件裂不裂。宁波市科隆新材料有限公司做改性PEEK和再生料选型多年，料源走东南亚进口渠道，进口料源颜色可控、本色料源充足、性能稳定，类似的选型案子每年处理几十起，说白了就是帮你把性能刺客在量产之前拦下来。
What is the biggest fear when buying recycled PEEK?
It's not that it's not heat-resistant. This product has a melting point of 343°C, can be used continuously at 250°C, and is almost immune to almost anything except concentrated sulfuric acid and rich nitric acid—it's a natural hardcore player.
The biggest worry is losing molecular weight. One of PEEK's core selling points is that the molecular chains are long and stable. After each hot processing cycle, molecular weight drops by 10% to 20%, and after three standard recyclings, the typical tensile strength drops by 8% to 12%—customers test the parts and find the strength is a notch lower, then accuse them of cutting corners. You can't even argue on the spot—because the heat-resistant material really hasn't shrunk, but the recycling process shortens the molecular chains.
Anyone making semiconductor CMP retaining rings, compressor wear-resistant piston rings, or automotive transmission bearing cages—who hasn't been seen as good material or labeled as something wrong?
This article thoroughly explains the performance temperament and color of recycled PEEK: which properties remain stable after cycling, which properties lose value after recycling, and why color directly determines what it can do. Read before placing an order, at least you have a plan.
Original Victrex 450G base first: density 1.30 grams per cubic centimeter, which is quite balanced among specialty engineering plastics; melting point 343°C, glass transition temperature 143°C, continuous use temperature about 250°C; tensile strength about 100 MPa, bending modulus 3.8 gigapa; simply supported beam notch impact about 5.0 kJ/m², elongation at break 25% to 50%; Water absorption rate about 0.05% in 24 hours, dimensions don't fluctuate much even in water; Natural UL94 V-0, with wall thickness as thin as 1.5 millimeters, meets standards without any flame retardants.
To put it bluntly, this thing is naturally heat-resistant, wear-resistant, and flame-retardant—a hexagonal warrior.
What about recycled material? Good news and bad news. The good news is, even after the molecular weight drops, tensile strength is basically retained—recycled samples can still be pulled around 90 MPa in actual tests, with limited reduction. The bad news is that the notch impact loses more than the specific strength, and ductility deteriorates accordingly.
Remember this asymmetry: it can withstand tensile performance cycles, but not after impact performance cycles. Choosing recycled PEEK is essentially a balance between the two.
Tm343°C and continuous 250°C are golden signatures
343°C is PEEK's financial backbone.
Let's correct a misconception: PEEK is a semi-crystalline material with a clear melting point. Unlike PEI and PPSU, which have only a glass transition temperature and no melting point, it suddenly melts at 343°C. So it can operate continuously at 250°C year-round and withstand 300°C in the short term.
Compare and understand: PEI has a continuous operating temperature of about 170 to 180°C, PPSU about 180°C, and PEEK is much higher. This is why it is specifically targeted in high-temperature scenarios such as aerospace structural parts, semiconductor CMP retaining rings, and downhole tools.
There are also costs: to process this thing, the barrel temperature must be raised to 360 to 400°C, and mold temperature 170 to 200°C is still mandatory—if the mold temperature isn't high enough, crystallinity won't increase, and the parts will flutter in size as soon as they come out. Ordinary injection molding machine barrels simply can't handle this temperature, so they need specialized barrels. This is the flip side of the golden signboard: the higher the temperature you can withstand, the more suffering you have to endure during processing.
Molecular weight drops faster than hair
The reputation for temperature resistance is solid, but molecular chains are shorter after every cycle.
The principle is simple: Each PEEK melt processing occurs at a high temperature range of 360 to 400°C, combined with oxygen in the air, and the aromatic rings and ether bond ketones are gradually sheared by the aging of the thermal oxygen. Once the chain is short, the molecular weight decreases, and melt fluidity increases. Stretching can still be supported by inter-chain forces, and after three recoveries, typically reduces by 8% to 12%; But impact is different—impact tests test whether the chain segment can absorb energy through entanglement under high-speed deformation. If the chain is short, fewer tangling points cause the notch impact to drop downward, which is more noticeable than when stretched.
There's a pitfall here that needs to be clarified in advance: this is a 10% to 20% reduction in molecular weight per cycle, and an 8% to 12% reduction in tensile after three cycles—these are PEEK-specific data and cannot be applied to other products. In industry, PIR offcuts at 25% to 75% combined with appropriate packing systems can maintain acceptable mechanical properties; To stabilize performance, 30% to 50% virgin new material is often mixed with recycled material for refresh. But there's a red line: for medical implants and clean-grade semiconductors, regulations prohibit any recycled material—this isn't a negotiation, it's the bottom line.
Foshan has a customer who makes wear-resistant piston rings for compressors. Previously, I wanted to buy domestic recycled PEEK for cheap prices. Each batch of chip had notch impact drifting from 4.2 to 2.8 kJ per square meter. The punched piston rings wore abnormally within less than 500 hours after installation. Two batches were returned in three months, with a return rate as low as 8%. Later, they switched to fixed imported materials from Southeast Asia—natural color unfilled sprue material and black wear-resistant grade sprue material separately. Imported material color is controllable, natural color is sufficient, and each truck comes with molecular weight and tensile test reports. Tensile strength is stable above 90 MPa, notch impact is stable above 4.0 kJ/m², and the return rate is reduced to 0.5%.
To put it plainly, imported materials have controllable colors, natural color sources are abundant, and performance is stable. On the mass production line, wear-resistant parts don't require remaking of benches every batch or risk lifespan with the whole batch.
Color is the second face of recycled PEEK .
The color of recycled PEEK directly determines what it can do.
Natural light brown amber is the natural color of unfilled resin and is the most expensive grade—natural PIR sprue material has a single composition, high cleanliness, and is highly scarce; Black is colored with carbon black, offering strong coverage, wide material availability, commonly used in wear-resistant bearings; Carbon fiber reinforced is black, high strength and rigidity; Glass fiber reinforced is light gray with white color and high rigidity.
Why is unfilled natural color grade the rarest? Because PEEK is processed at high temperatures, molecules inevitably age by heat and oxygen, causing the color to deepen step by step—from light brown to yellow, then to brown, then to black, and this discoloration is irreversible. If you use recycled natural color material to make exterior parts, the color simply can't be suppressed. A large part of the price difference between natural pure resin and glass fiber reinforcement is a premium paid for the word 'natural color. '
The color change mechanism is not complicated: repeated high-temperature processing combined with thermal oxygen aging forms a chromophore on the molecular chains, and with impurities accumulating bit by bit, the color gets darker and darker. Another point to note is that PEEK is extremely sensitive to contamination. Any black spots, calcium carbonate, or impurities mixed in will form black spots on the final part, and Victrex has clearly pointed out this issue.
Here's a simple logic: for exterior parts that want natural color, don't expect recycled materials; For internal wear-resistant parts that aren't afraid of black, black is more cost-effective. Choosing the right color saves you the cost of color matching and the hassle of color changes.
Wear resistance, self-lubrication, and chemical resistance are the last stubborn ones.
If temperature resistance is PEEK's trademark, then wear resistance and chemical resistance are its bottom line.
PEEK alternating aromatic rings and ether ketone groups on the molecular chain, the structure is inherently hard and tough, with a low friction coefficient and wear resistance far superior to nylon and graphite nylon. For places where repeated friction is needed for bearing cages, gears, and piston rings, it's a regular customer.
Chemical resistance is even more solid: resistant to most organic solvents, acids, alkalis, and oils, except for strong oxidizing agents like concentrated sulfuric acid and concentrated nitric acid. It also excels in hydrolysis and steam resistance—it can withstand 134°C steam repeated sterilization over 1000 times with no significant performance decline, which is key to its use in medical and food fields. Its dielectric properties are also stable, with little drift across a wide temperature and frequency range, making it suitable for insulating areas like electronic connectors and coil frames
But there's an unavoidable pitfall: the color deepening caused by high-temperature processing is irreversible. If you want to make light-colored, natural color parts, repeatedly recycled materials can't hold the color back. That's why most recycled PEEK in the industry goes black—using black to cover color differences, out of sight is out of sight. That's why high-end medical and semiconductor clean parts prefer to choose the original color, while recycled materials honestly use black masking for wear-resistant structural parts. Wear resistance and chemical resistance are the costs given by molecules, while color deepening is an unavoidable cost in the recycling process.
Four sub-directions, explained in one sentence
High temperature resistance grade: Focuses on a melting point of 343°C and continuous use temperature of 250°C, making long-term heat-resistant aerospace replacement parts and semiconductor equipment structural parts.
High Wear and Toughening Grade: After recovery, molecular weight decreases and impact worsens; relying on blending ratio and filler to stabilize notch impact within usable range, used for bearings, gears, and piston rings.
Natural Flame Retardant Grade: Does not rely on flame retardants or natural V-0, but is used for electronic, electrical, and connector frameworks that require flame retardant smoke and toxicity.
Chemical Resistance Grade: Resistant to most acids, alkalis, solvents, and oils, resistant to repeated steam sterilization, used for chemical seals and medical device accessories.
Final Notes: Seven Material Selection Tips
1. Focus on Temperature Resistance: Melting point 343°C, continuous 250°C, this is PEEK's cost—don't replace it with ordinary engineering plastics;
2. Monitor molecular weight: reduce by 10% to 20% per cycle, and after three recyclings, tensile reduction is 8% to 12%, with impact loss more pronounced than tensile reduction;
3. Monitor blending: PIR fillers can be blended with 25% to 75%, commonly using 30% to 50% virgin new material for refreshing and stabilizing performance;
4. Monitor color: natural amber is rare and most expensive, black is available in large quantities and cheap, choose based on appearance requirements;
5. Monitor yellowing: color deepening during high-temperature processing is irreversible; do not repeatedly recycle natural color parts;
6. Monitor wear and chemical resistance: low friction, solvent resistance, and resistance to thousand-steam are the costs provided by molecules;
7. Keep an eye on the red line: medical implants and semiconductor cleanrooms are prohibited from using recycled materials—don't touch this rule.
In conclusion: The performance record of recycled PEEK is essentially that it can withstand temperature and wear resistance, but cannot withstand molecular weight shocks. A melting point of 343°C and continuous use at 250°C are inherent advantages, and even after cycling, they can still stand; Molecular weight is the chopstick that breaks easily during recycling; whether mixing is accurate directly determines whether your mass-produced parts crack. Ningbo Kelong New Materials Co., Ltd. has been selecting modified PEEK and recycled materials for many years, sourcing through Southeast Asian import channels. The imported materials have controllable colors, sufficient natural color sources, and stable performance. Dozens of similar selection cases are handled annually, essentially helping you stop the performance assassins before mass production
