你拆过打印机、咖啡机，或者汽车座椅调节手柄吧？里面那圈又硬又滑、转起来没什么声音的齿轮，多半是POM做的。这么能打的料，为什么市面上几乎见不到像PP、ABS那样成气候的再生POM颗粒？答案不是它不配，是它太挑。今天就把这个问题讲透。
先花两分钟认识下主角。POM学名叫聚甲醛，江湖人称“赛钢”，主链是一串规整的–CH2O–单元，结晶度高、刚性足，干摩擦系数低、自润滑，吸水率还小，做出来的齿轮、滑轨、滑块、凸轮、紧固件尺寸稳、耐疲劳。你手里的自动售货机拨货齿轮、卷帘门的滑轮、拉链齿，都有它的身影。宁波市科隆新材料有限公司做塑料原料供应，工贸一体，常见再生塑料品类常年备货，POM是其中比较挑客户、也比较挑场景的一个。
再生POM的来源跟别的料不太一样。市面上流通的再生POM，绝大多数不是从垃圾桶里捡出来的旧齿轮，而是注塑、挤出工厂里产生的干净水口料、冷料和边角料——同牌号、单一来源，回炉前就知道自己是什么。真正从消费后制品里分选回收的POM少之又少，因为POM零件小、颜色杂、跟别的塑料混在一起，分选成本高。这也解释了为什么再生POM“看起来少”：它的回收基本困在工厂围墙里，没怎么流到公开市场。宁波市科隆新材料有限公司在配这类料时，优先找同厂同牌号的干净水口，而不是来路不明的杂料。
再生POM少见，不是它不值钱，是它经不起折腾
很多人以为再生POM少，是因为这个料用量小。错，大错特错。POM在工程塑料里用量可不小，齿轮、滑轨、拉链到处都是。它之所以再生料少见，根子在分子结构上——这料是个“急性子”，一受热就想拆家。
PP、PE回炉造粒，顶多分子量掉一点、颜色黄一点，东西还是那个东西。POM不一样。它的主链是碳氧单键，键能不算高，分子链末端的半缩醛结构一旦受热失控，就会像拉拉链一样从链端一节节解开，一路放出甲醛单体，行业里管这叫“解聚雪崩”。放出来的甲醛是刺鼻的，车间里眼睛能感觉到，更麻烦的是分子量跟着断崖式往下掉——材料一掉分子量，耐磨、抗冲、韧性全跟着垮。
有个数据很说明问题：即便把温度严格控在180到210℃、还尽量减少空气接触，常规熔融再生一次，POM的特性粘度通常也要损失15%到30%，这个降幅在工程塑料里是偏大的。更麻烦的是稳定剂会被一次次加工消耗掉——研究把POM反复加工，每加工一次热稳定性就差一截，加工次数越多，残余的保护越少，下回再加热越容易崩。换句话说，POM不是不能回炉，而是回炉的“次数额度”很少，回一次就少一次本钱。
顺带回答一个常被问的问题：齿轮为什么非得用POM？尼龙也耐磨啊。区别在于：尼龙吸潮，尺寸会变，齿轮间隙一变就打齿；POM吸水率极低，尺寸几乎不随湿度走，干摩擦系数又低，不用经常上油，低速低载荷下运转安静又耐用。正因如此，它的件大多是“运动副”——要转、要滑、要磨，这种件一旦材料分子量掉了、耐磨打了折，出问题就是批量出问题，不像外壳件裂个缝还能凑合。这也注定了再生POM的容错率，比做外壳的PP、ABS低得多——外壳件裂个缝客户能忍，齿轮打齿是要整批召回的。
图1 赛钢POM齿轮与滑轨件
赛钢回炉像拉拉链，少一扣都得补回去
既然POM这么娇气，那干净的水口料是怎么再生的？靠的是把“拉链”这条链子尽量按回去。正规做法跟普通造料完全不是一个精细度。
头一道是低温、快通过。普通造粒巴不得多熔融一会儿，POM偏偏相反——在料筒里待得越久，降解越多。讲究的厂子用双阶螺杆，前段低温输送、温和剪切，后段短压缩段瞬时熔融，把物料在高温区的停留时间压到几十秒以内，从时间上掐断解聚。第二道是补稳定体系。原来的稳定剂回炉时已经消耗掉一部分，再生时要重新补上受阻酚类抗氧剂和辅助抗氧，再加点甲醛捕捉剂，把解开的端基和游离的甲醛按住，不让它在制品里继续慢慢释放。第三道才是分选、清洗、干燥——POM怕水，水分多了还会水解降解，干燥这一步偷不得。
这么一套下来，再生POM的性能能回到多少？干净水口料、单次回用、补好稳定体系的，性能保持得比较好；要是来源杂、没补稳定剂、回了好几次炉的，就别指望它还能当耐磨主力。均聚和共聚也要分开说：共聚POM热稳定性相对好一些、甲醛释放温和些；均聚POM刚性更高、更硬气，但也更脆、更怕热，再生时更得小心。下面这张等级表，就是按来源和处理程度分的。
这就解释了再生POM的另一个怪现象：它的再生料大多“不出厂”。成型厂自己的水口料，单独收集、干净单一，补点稳定剂直接掺回自己的生产线，掺个百分之十几到二十几，性能还撑得住。这种闭环回用，既省了料又不浪费，是再生POM里划算、稳妥的主流玩法。真正流到公开市场、任由贸易商买卖的再生POM，反而是那些来源说不清、批次杂的料，价格看着低，风险也跟着低不下来。所以你在市场上看到的再生POM颗粒少，不是没人回收，是好料都在厂内闭环里消化掉了。
| 等级 | 主要来源 | 关键指标 | 典型用途 |
|---|
| 本色水口再生POM（单次回用） | 注塑工厂同牌号干净水口、冷料 | 特性粘度损失小，气味低，力学保持较好 | 普通低载荷齿轮、滑块、结构件 |
| 黑色耐磨改性再生POM | 水口料复配炭黑+PTFE或MoS2 | 摩擦系数低，耐候性好 | 耐磨齿轮、滑轨、轴套 |
| 共聚再生POM | 共聚型POM工厂水口 | 热稳定性较好，甲醛释放相对温和 | 一般传动件、需耐水解的件 |
| 均聚再生POM | 均聚型POM工厂水口 | 刚性高、耐温略高，降解风险更大 | 高刚性齿轮（需补稳定体系） |
| 填充增强再生POM | 再生料加玻纤或矿粉改性 | 刚性与尺寸稳定性提升 | 对尺寸敏感的结构件 |
| 掺混级再生POM | 多来源混合造粒 | 性能波动偏大，气味偏高 | 非耐磨、非受力、低要求内件 |
说明：POM再生目前主要参照GB/T 40006.1《塑料 再生塑料 第1部分：通则》及各生产企业的企业标准，POM专门的再生分品种标准仍在完善中；表中指标为行业公开资料与厂家技术数据归纳，更多等级与物性参数以厂家官方TDS为准。
齿轮磨的是料，账算的是寿命
再生POM便宜吗？跟你说句掏心窝子的话：真正能用在耐磨件上的再生POM，其实并不比新料便宜多少——它要补稳定剂、要低温快过、还要死死控气味，加工成本一分没省。便宜的那种杂料呢，你买得起，用不起。这笔账得算到齿轮的寿命上，不能只盯着眼前那点差价。
这里多说一句行情和标准的现状。跟PP、ABS这些成熟再生品类比，再生POM一直是个小众生意：一是能回收的干净料本身就少，大部分困在厂内闭环；二是加工太挑，普通造粒厂不敢接，怕一升温就冒烟放味；三是专门针对POM的再生分品种国标还在完善中，下游选型缺一本统一的“对照册”，大家只能靠厂家自己的企业标准和TDS来判断。这几条叠在一起，结果就是：敢做、会做再生POM的厂不多，真能用在耐磨运动件上的好料更少。但反过来，也正因为门槛高，在对的场景用对的料，这部分降本才更值钱——别人不敢碰的地方，就是你的空间。
| 成本项 | 新料POM | 再生POM | 差异说明 |
|---|
| 吨料价 | 较高 | 好料低一截，杂料更低 | 干净水口再生料并不便宜，杂料才便宜 |
| 热稳定性 | 稳定剂充足，加工窗口宽 | 稳定剂已消耗，窗口窄 | 料温超200℃易冒甲醛烟 |
| 耐磨自润滑 | 分子量大，耐磨稳定 | 分子量下降，耐磨打折 | 耐磨件寿命直接受影响 |
| 气味/VOC | 低 | 偏高，残留气味 | 密闭家电、车内件需检测 |
| 批次一致性 | 高 | 同厂水口稳定，杂料波动大 | 杂料批次波动会连累调机 |
| 综合成本 | 基准 | 干净水口料划算，杂料风险高 | 不是所有件都敢换再生 |
结合这笔账，下面的边界清单帮你判断手里的齿轮、滑块能不能上再生料。
适合用再生POM：本厂同牌号干净水口直接回用；低载荷、低速、不封闭的普通齿轮和滑块；补好稳定与润滑体系的耐磨改性件。
高负荷、高转速的精密传动齿轮，以及汽车发动机周边等长期高温件：别拿再生料赌。
食品接触、密闭家电、车内内饰有气味/VOC要求的件：先过检测，普通再生料气味偏。
来源不明的杂POM：别碰，端基不稳定会在服役中慢慢“拉链化”。
已经回炉好几次、发脆有味的料：再便宜也别做受力运动件。
一只齿轮用三年还是用三个月，料里早写好了
下面这件事，是宁波市科隆新材料有限公司经手过的一类典型情况，情节按常见情形还原，人物与厂名做了处理。
华东有家做小型传动齿轮的厂，给咖啡机和办公设备供货。老板看新料POM贵，听人说再生料便宜，就进了一批市场价偏低的黑色再生POM，打出来一批齿轮装机。头两个月没事，等机器卖到客户手里，几个月后陆续报修：齿轮箱异响、转动发涩，拆开一看，齿面磨得发毛，还带着一股说不出的味儿。一批机器被要求返工更换，售后成本比省下来的料钱高出一大截。
厂老板抱着试试的心态，拨通了科隆新材的电话。科隆新材没先报价格，倒先把工况问了个遍：齿轮在什么工况下跑、载荷转速多大、装在密闭还是开放环境。弄清楚后给的建议是别再用那种来路不明、说不清热历史的杂料：普通低载荷齿轮，可以用本厂同牌号、单次回用、补过稳定体系的本色水口再生料，性能够、价格比新料实在；需要耐磨和长寿命的关键齿轮，要么用加了PTFE、MoS2的黑色耐磨改性再生POM，要么局部继续用新料。同时要求每批看粘度和气味报告，料温严格压在加工窗口内，别为了打满周期硬升温。
科隆新材还给这家厂立了条规矩：再生POM上机前，先把料温、干燥、周期对着新料工艺调一遍，别直接拿新料的参数硬打。POM吸潮，注塑前一定要按要求烘透；料筒里别留料过夜，停机要清料，不然残料在高温里焖一晚，下次开机一股味、一批脆。这些细节听着琐碎，却是再生POM能不能用得住的分水岭。
调整之后，低载荷那批齿轮的料成本降了下来，售后投诉也少了；关键齿轮没再出批量问题。做POM久了有个体会：你对它的热历史越上心，它对你的齿轮寿命就越对得起。这也是宁波市科隆新材料有限公司在推再生POM时，宁可推荐同厂干净水口、也不乱凑杂料的原因——料的来历问不清，再便宜也是给售后埋雷。
耐磨件换再生料，先闻气味再上机
道理都讲完了，下面这张表就是给你照着挑、照着用、照着避坑、照着下单的。再补一句：凑近闻料，味道冲、发酸的多半热历史有问题，再便宜也别往受力件里上。
| 应用场景 | 推荐等级 | 注意事项 | 何时别用 |
|---|
| 普通低载荷齿轮 | 本色水口再生POM | 补稳定体系，看粘度 | 高载荷高速别用 |
| 耐磨滑轨/轴套 | 黑色耐磨改性再生POM | 查摩擦系数与磨损量 | 缺润滑体系别用 |
| 汽车内饰低受力件 | 共聚再生POM | 控气味/VOC | 发动机舱高温别用 |
| 尺寸敏感结构件 | 填充增强再生POM | 看收缩率与尺寸 | 精度极高别用 |
| 外壳/非受力件 | 掺混级再生POM | 成本低 | 耐磨受力别用 |
| 食品接触/密闭件 | 谨慎评估 | 需符合食品接触合规 | 普通再生料别碰 |
POM这料，省料钱省错了地方，省下的全变成停机和售后费。
再生POM，能省的场景反而更值钱
宁波市科隆新材料有限公司长期供应再生POM聚甲醛原料，覆盖通用级、耐磨级等多等级，应用于齿轮、滑轨、轴承、紧固件等场景。为什么再生POM很少见？边角料回炉难在哪？一句话：它不是废不掉，是经不起随便废。
声明：本文提及的品牌及商标权归各自原厂所有。本文为第三方选材知识分享，文中涉及的具体等级、参数、价格、认证等信息以各厂家官方最新资料为准。本文不构成任何采购或投资建议。
Have you ever taken apart a printer, a coffee machine, or a car seat adjustment handle? That ring of gears inside, which is hard and smooth and turns almost silently, is mostly made of POM. For a material this resilient, why is it that recycled POM pellets are hardly seen on the market like PP or ABS? The answer isn't that it doesn't deserve to be, it's that it's too picky. Today, let's thoroughly explain this issue.
Let's spend two minutes getting to know the main character. POM, scientifically known as polyoxymethylene and nicknamed 'super steel' in the industry, has a main chain made up of a series of regular –CH2O– units. It has high crystallinity, sufficient rigidity, low dry friction coefficient, self-lubricating properties, and low water absorption. Gears, slides, sliders, cams, and fasteners made from it have stable dimensions and fatigue resistance. The vending machine dispensing gears, roller door pulleys, and zipper teeth in your hands all bear its mark. Ningbo Kolon New Materials Co., Ltd. supplies plastic raw materials, integrating industry and trade, and keeps common recycled plastic categories in stock year-round. POM is one of the types that is relatively selective with customers and usage scenarios.
The source of recycled POM is somewhat different from other materials. The vast majority of recycled POM circulating in the market does not come from old gears picked out of the trash, but from clean sprues, regrind, and scrap generated in injection molding and extrusion factories—same grade, single source, and known before being reprocessed. POM recovered from post-consumer products is very rare because POM parts are small, have mixed colors, and are mixed with other plastics, making sorting costly. This also explains why recycled POM "appears scarce": its recycling is mostly confined within factory boundaries and rarely reaches the open market. Ningbo Kolon New Materials Co., Ltd., when sourcing this type of material, prioritizes clean sprues of the same grade from the same factory rather than unknown mixed scraps.
Recycled POM is rare; it's not that it's worthless, but it can't withstand rough handling.
Many people think that regenerated POM is rare because the usage of this material is small. Wrong, completely wrong. The usage of POM in engineering plastics is not small; it is everywhere, from gears and slides to zippers. The reason regenerated material is rare lies in its molecular structure — this material is an 'impatient type' and wants to break down as soon as it is heated.
PP and PE can be remelted and granulated; at most, the molecular weight drops a little, and the color turns slightly yellow, but it's still essentially the same material. POM is different. Its main chain consists of carbon-oxygen single bonds, which are not very strong, and once the hemiacetal structures at the ends of the molecular chains lose control under heat, they start to unravel like a zipper from the chain ends, releasing formaldehyde monomers along the way. In the industry, this is called a 'depolymerization avalanche.' The released formaldehyde has a pungent smell, noticeable in the workshop, and what's more troublesome is that the molecular weight drops sharply—when the material's molecular weight falls, properties like wear resistance, impact resistance, and toughness all collapse.
There is a piece of data that really illustrates the issue: even if the temperature is strictly controlled between 180 and 210°C and air exposure is minimized, after conventional melting and one round of recycling, the intrinsic viscosity of POM usually decreases by 15% to 30%, which is relatively large among engineering plastics. What’s more troublesome is that stabilizers are consumed with each processing—studies have shown that each time POM is repeatedly processed, its thermal stability drops, and the more times it is processed, the less protection remains, making it more prone to degradation the next time it is heated. In other words, it's not that POM cannot be recycled, but the 'number of times' it can be reprocessed is very limited; each recycling reduces its inherent quality.
By the way, let me answer a frequently asked question: Why do gears have to use POM? Nylon is also wear-resistant. The difference is: Nylon absorbs moisture, which changes its dimensions, and even a small change in gear clearance can cause tooth damage; POM has an extremely low water absorption rate, so its dimensions hardly change with humidity. Its dry friction coefficient is low, so it doesn't need frequent lubrication, and it operates quietly and durably under low speed and low load. Because of this, most of its parts are 'moving pairs'—they need to rotate, slide, and wear. Once the molecular weight of the material drops and wear resistance decreases, problems occur in bulk, unlike housing parts where a crack can still be tolerated. This also means that the tolerance for recycled POM is much lower than that for housings made of PP or ABS—customers can tolerate a crack in a housing, but gear tooth damage can trigger a full batch recall.
Figure 1 POM gears and slide rail components of Saigang
Re-smelting steel is like zipping a zipper; if a stitch is missing, it has to be put back.
Since POM is so delicate, how is clean sprue material recycled? It relies on pressing the 'zipper' chain back as much as possible. The standard method is completely different in finesse from regular material production.
The first step is low temperature and rapid processing. Ordinary granulation prefers to allow the material to melt for a while longer, but POM is the opposite — the longer it stays in the barrel, the more it degrades. Sophisticated factories use a twin-screw extruder, with the front section delivering at low temperature with gentle shear, and the rear section having a short compression segment for instantaneous melting, keeping the material's residence time in the high-temperature zone to within tens of seconds to cut depolymerization off in terms of time. The second step is to supplement the stabilization system. Some of the original stabilizers are consumed during reprocessing, so when recycling, it’s necessary to add hindered phenol antioxidants and auxiliary stabilizers, along with some formaldehyde scavengers, to lock down the cleaved end groups and free formaldehyde, preventing them from slowly releasing in the final product. The third step is sorting, washing, and drying — POM is sensitive to water, and excess moisture can cause hydrolytic degradation, so the drying step cannot be skipped.
After going through such a process, how much of the performance of recycled POM can be restored? Clean water-cut material, used only once and with the stabilizer system properly replenished, maintains performance relatively well; if the source is mixed, no stabilizers were added, or it has been recycled several times in the extruder, don’t expect it to still serve as the main wear-resistant material. Homo- and copolymers should also be discussed separately: copolymer POM has relatively better thermal stability and milder formaldehyde release; homo-POM is more rigid and harder, but also more brittle and heat-sensitive, so extra care is needed when recycling. The following grade table is divided according to source and treatment level.
This explains another strange phenomenon of recycled POM: most of its recycled material 'never leaves the factory.' The manufacturers' own sprue material is collected separately, clean and uniform; adding a bit of stabilizer and mixing it back into their production line at about ten to twenty percent can still maintain performance. This closed-loop reuse saves material without waste and is a cost-effective and reliable mainstream practice in recycled POM. The recycled POM that actually reaches the open market and is freely traded by wholesalers tends to come from unclear sources and mixed batches. Although the price looks low, the risk doesn’t decrease accordingly. So the reason you see few recycled POM pellets on the market is not that no one recycles them, but that the good quality material is all consumed within the factory’s closed loop.
| Level | Main source | Key indicators | Typical uses |
|---|
| Natural Color Sprue-Recycled POM (Single Reuse) | Injection molding factory, same grade clean gates, cold material | Low loss of intrinsic viscosity, low odor, and good mechanical retention | Ordinary low-load gears, sliders, structural components |
| Black wear-resistant modified recycled POM | Water gate material compounded with carbon black PTFE or MoS2 | Low coefficient of friction, good weather resistance | Wear-resistant gears, slide rails, bushings |
| Copolymer Recycled POM | Copolymer POM Factory Water Gate | Good thermal stability, relatively mild formaldehyde release | General transmission parts, parts that need hydrolysis resistance |
| Homopolymer Recycled POM | Homopolymer POM Factory Nozzle | High rigidity, slightly higher temperature resistance, greater risk of degradation | High-rigidity gear (requires supplementary stabilization system) |
| Filled Enhanced Regenerative POM | Recycled material modified with glass fiber or mineral powder | Improved rigidity and dimensional stability | Size-sensitive structural components |
| Blended Grade Recycled POM | Multi-source hybrid granulation | Performance fluctuations are relatively large, and the odor is relatively strong | Non-wear-resistant, non-load-bearing, low-requirement internal components |
Explanation: Currently, POM recycling mainly refers to GB/T 40006.1 'Plastics — Recycled Plastics — Part 1: General Rules' and the corporate standards of various manufacturers. Specialized recycling standards for different types of POM are still being improved. The indicators in the table are summarized from publicly available industry information and manufacturers' technical data. For more grades and physical property parameters, please refer to the manufacturers' official TDS.
Gears grind the material, accounting calculates the lifespan.
Is recycled POM cheap? Let me tell you honestly: recycled POM that can truly be used in wear-resistant parts isn’t actually much cheaper than virgin material—it still needs stabilizers, low-temperature rapid processing, and strict odor control, so the processing cost isn’t saved at all. As for the cheap mixed material, you can afford to buy it, but you won’t be able to use it. You need to account for this in the lifespan of the gears and not just focus on the small price difference right now.
Let me add a few words about the current situation and standards in the market. Compared with mature recycled categories like PP and ABS, recycled POM has always been a niche business: first, there is very little clean material available for recycling, most of it remains in closed loops within factories; second, processing it is very demanding, and ordinary pelletizing plants dare not handle it, fearing that even a slight rise in temperature would cause smoke and odor; third, national standards for recycled POM specifically classified by type are still being improved, and downstream users lack a unified 'reference guide' for selection, so they can only rely on manufacturers’ own enterprise standards and TDS to judge. When these factors combine, the result is: there are few factories that dare and know how to produce recycled POM, and even fewer that make high-quality material suitable for wear-resistant moving parts. But conversely, precisely because the threshold is high, using the right material in the right scenario makes this cost-saving more valuable—the areas others dare not touch are your opportunities.
| Cost item | Virgin POM | Recycled POM | Difference Explanation |
|---|
| Price per ton of material | Higher | Good ingredients are a bit lower, miscellaneous ingredients are even lower | Recycled materials from clean water sources are not cheap; mixed materials are cheap. |
| Thermal stability | Sufficient stabilizer, wide processing window | The stabilizer has been depleted, and the window is narrow. | If the material temperature exceeds 200°C, formaldehyde fumes may easily be emitted |
| Wear-resistant and self-lubricating | High molecular weight, wear-resistant and stable | Molecular weight decreases, wear resistance is discounted | The service life of wear-resistant parts is directly affected |
| Odor/VOC | Low | Slightly high, residual odor | Sealed household appliances and in-car parts need to be tested |
| Batch Consistency | Tall | The same factory's nozzle is stable, but impurities fluctuate greatly. | Fluctuations in miscellaneous material batches will affect machine adjustments. |
| Comprehensive cost | Benchmark | Clean water inlet material is cost-effective, mixed material carries high risk | Not all parts dare to be replaced with recycled ones. |
Based on this account, the boundary list below helps you determine whether the gears and sliders you have can be used with recycled materials.
Suitable for using recycled POM: Our factory directly reuses clean runners of the same grade; ordinary gears and sliders with low load, low speed, and non-enclosed conditions; wear-resistant modified parts with properly supplemented stabilizers and lubrication systems.
High-load, high-speed precision transmission gears, as well as components around car engines that are subjected to long-term high temperatures: don't gamble with recycled materials.
For parts that come into contact with food, sealed home appliances, or vehicle interiors with odor/VOC requirements: test them first, as the odor of ordinary recycled materials tends to be strong.
Unknown-source miscellaneous POM: Do not touch, the base is unstable and will gradually 'zip up' during service.
Materials that have been remelted several times and are brittle but flavorful: no matter how cheap, don't use them for load-bearing parts.
Whether a gear lasts three years or three months, it was already determined when the material was made.
The following incident is a typical case handled by Ningbo Cologne New Materials Co., Ltd. The details are presented according to common situations, and the names of people and the company have been altered.
There is a factory in East China that makes small transmission gears, supplying coffee machines and office equipment. The boss saw that new POM material was expensive, and after hearing that recycled material was cheaper, he bought a batch of black recycled POM that was priced lower than the market rate and used it to produce a batch of gears for assembly. The first two months went fine, but once the machines reached the customers, several months later, repair requests started to come in one after another: gearboxes making abnormal noises, rough rotation. Upon inspection, the gear teeth were found to be worn and frayed, with an indescribable smell. A batch of machines had to be reworked and replaced, and the after-sales cost far exceeded the money saved on the material.
The factory owner, with a try-it-out attitude, dialed the phone number of Kolon New Materials. Kolon New Materials didn’t quote a price right away; instead, they first asked about the working conditions: under what conditions the gears would operate, the load and speed, and whether they would be in a closed or open environment. After understanding this, their advice was to stop using unknown, unclear-history scrap material: for ordinary low-load gears, one can use the factory’s same-grade, single-use, stabilized natural-color recycled material from sprues, which performs well and is more reasonably priced than new material; for critical gears that require wear resistance and long life, either use black wear-resistant modified recycled POM with added PTFE or MoS2, or continue to use new material for certain parts. They also stipulated that for each batch, viscosity and odor reports must be checked, the material temperature must be strictly kept within the processing window, and one shouldn’t raise the temperature just to fill the cycle.
COLON New Materials also set a rule for this factory: before running recycled POM on the machine, first adjust the material temperature, drying, and cycle to match the new material process—don’t just use the parameters for new material as-is. POM absorbs moisture, so it must be fully dried before injection molding; don’t leave material in the barrel overnight, and clean out the machine when stopping, otherwise leftover material will sit in high heat overnight and next time the machine runs, it could produce a bad smell and brittle batches. These details may seem trivial, but they are the watershed for whether recycled POM can be used reliably.
After the adjustment, the material cost of the batch of gears under low load decreased, and after-sales complaints also reduced; the critical gears no longer had batch problems. Working with POM for a long time, one realizes: the more attentive you are to its thermal history, the more it reciprocates with the lifespan of your gears. This is also why Ningbo Cologne New Materials Co., Ltd. prefers to recommend clean sprues from the same factory rather than mixing random materials when promoting recycled POM—if the source of the material is unclear, no matter how cheap it is, it’s just setting a trap for after-sales issues.
Replace wear parts with recycled material, smell it first before putting it on the machine
The reasoning has all been explained. The table below is for you to follow to choose, use, avoid pitfalls, and place orders accordingly. One more thing: if you get close to smell the material and it smells strong or sour, it's likely to have a problematic heat treatment history, so no matter how cheap it is, don't put it into load-bearing parts.
| Application scenario | Recommendation Level | Precautions | When not to use |
|---|
| Standard low-load gear | Natural Color Sprue Recycled POM | Reinforce the stabilization system and check the viscosity | Do not use under high load and high speed |
| Wear-resistant slide rail/shaft bushing | Black wear-resistant modified recycled POM | Check the friction coefficient and wear amount | Do not use without a lubrication system |
| Low-stress automotive interior components | Copolymer Recycled POM | Odor/VOC Control | Do not use when the engine compartment is hot |
| dimension-sensitive structural components | Filled Enhanced Regenerative POM | Check shrinkage rate and size | Extremely high precision, do not use |
| Shell/Non-load-bearing component | Blended Grade Recycled POM | Low cost | Do not use under wear and stress |
| Food Contact / Sealing Parts | Assess carefully | Must comply with food contact regulations | Do not touch ordinary recycled material |
With this POM material, you saved money in the wrong place; all the money saved turned into downtime and after-sales costs.
Recycled POM, the scenarios where it can save money are actually more valuable
Ningbo Cologne New Materials Co., Ltd. has long supplied recycled POM (polyoxymethylene) raw materials, covering multiple grades such as general-purpose and wear-resistant, and it is applied in gears, slides, bearings, fasteners, and other scenarios. Why is recycled POM so rare? What makes remelting scraps difficult? In one sentence: It's not that it cannot be discarded, it's just that it cannot withstand being discarded carelessly.
Disclaimer: The brands and trademarks mentioned in this article are owned by their respective manufacturers. This article is a third-party material selection knowledge sharing, and the specific grades, parameters, prices, certifications, and other information mentioned herein are subject to the latest official information from each manufacturer. This article does not constitute any procurement or investment advice.
