"张工，这个燃油系统的耐磨件，PA66用着老是磨、还渗油，到底换什么？"
"你试试POK。"
"POK？又是个新料，贵不贵？副牌有没有靠谱的？"
"贵是贵点，但这料全球基本就一家在量产，副牌你得认原厂原粒，别瞎找。"
这段对话，差不多是汽车燃油系统件采购和工程师之间的日常。广西柳州有家做汽车燃油系统部件的厂，就卡在这段对话上——他们的一个燃油管接头，PA66磨不住、阻氧还差点意思，工程师一提POK，采购第一反应是"这料听都没听过，副牌敢用吗"。
POK（聚酮）小众，又近乎一家独大，坑自然也就集中在"认不认得出原厂原粒"这一件事上。今天把POK讲透。
POK是什么，谁在供
POK，学名聚酮（Polyketone），主链由一氧化碳和烯烃交替排列的半结晶脂肪族工程塑料。它的看家本事是抗冲击、耐磨、耐化学、耐燃油、阻气性好，还是环保料——不含甲醛、丙烯腈，食品医疗级能过FDA。汽车燃油系统、耐磨齿轮、水管理件、食品接触件都爱用它。
POK是近乎寡头的小众品类，全球主要国外玩家按实际梯队写：
晓星（Hyosung，韩国）：POKETONE是它家招牌，全球首个把脂肪族聚酮商业化量产的厂家，蔚山龙岩（Yongyeon）工厂年产能五万吨，2015年起商业量产，在这个品类里基本是主导供应；
EMS-GRIVORY（瑞士）：GRINYL K聚酮系列，基于专利技术做增强、阻燃品级，主打低排放与耐化学；
艾万提（Avient，美国）：Edgetek PKE系列聚酮改性料，定位尼龙替代、低碳足迹。
早年壳牌、杜邦、Kuraray等在聚酮上有过技术布局，但真正把脂肪族聚酮大规模做起来的，目前就是晓星一家独大，剩下两家是补充与改性档。
副牌是什么，独苗料的边界
POK副牌的概念，还是那一套。
定义：同一厂家同一牌号里，出厂检验没完全踩中正牌指标的那部分。同一批聚合料，合格贴正牌，个别指标小幅浮动就是副牌。
四大来源：开停车头尾料、牌号切换过渡料、工艺波动致熔指/结晶度/某一项小幅超标的批次、副线尾料。
它仍是原厂原生聚合粒子，分子结构和正牌一致。和回料、再生料的边界：
| 类型 | 来源 | 品质 | 典型用途 |
|---|
| 正牌 | 原厂达标批次 | 全指标达标、批次稳 | 燃油系统、耐磨承重件 |
| 副牌 | 原厂未完全达标批次 | 个别指标小幅偏离，基材同源 | 一般耐磨件、非承压结构件 |
| 回料/水口料 | 加工边角料再造粒 | 已受过一次热历史 | 低要求制品 |
| 再生料 | 废旧塑料回收造粒 | 性能波动大 | 低端填充 |
POK主链是碳和一氧化碳交替排出来的，结晶致密，耐磨耐燃油的底子就在这。副牌只要基材是原厂原粒，这个底子还在。
晓星POKETONE：近乎独苗的主供
晓星POKETONE在脂肪族聚酮里基本是独苗主供，蔚山厂年产能五万吨，品级覆盖未增强、玻纤增强、阻燃、食品医疗级（F级过FDA、NSF、USP Class VI）。燃油系统接头、耐磨脚轮、水管理件用得最多。
它的副牌浮动项，常见是熔指和结晶速度，抗冲击、耐燃油的主干性能还在。做非承压的一般耐磨件、非燃油直触的结构件，这种副牌够用；做燃油系统承压、耐磨关键件，得用正牌或精选副。包装分大包装、小包装，按批量领。
适用场景：燃油系统件、耐磨件、水管理。
EMS-GRIVORY GRINYL K：瑞士补充档
EMS-GRIVORY的GRINYL K聚酮系列，走专利技术路线，做未增强、增强和阻燃品级，强调低排放、耐化学和UL94 V0阻燃。它量不如晓星大，定位是补充和差异化。
这档副牌适合做对阻燃、低排放有要求的周边件。要做主流燃油系统件，还是晓星POKETONE渠道更稳、品级更全。
适用场景：阻燃周边件、低排放件。
Avient Edgetek PKE：改性复配档
艾万提Edgetek PKE系列是聚酮改性料，定位尼龙替代、更低碳足迹，适合化学腐蚀、耐腐蚀工况。这一档是改性复配，不是原厂原生聚合，副牌来源更要盯紧，能做一般耐磨件，但燃油系统关键承压件别在这档赌。
对采购来说，POK真正靠谱的主供就是晓星POKETONE一家，其余两家是补充。
避坑：燃油件最怕什么
POK副牌做汽车燃油系统件，三个坑。
一、别把改性复配料当原厂原粒。POK主供是晓星，副牌也得是它家同一牌号的原厂原粒，改性复配料的耐燃油和批次稳不一定够。
二、耐磨和耐燃油按工况验。燃油直触、承压件要做浸泡和耐磨留样，熔指对上不等于工况过关。
三、熔指和结晶速度先对工艺。副牌常飘这两项，注塑工艺窗口先调稳再批量。
科隆仓库现货｜POK可查
主推品牌：韩国晓星Hyosung、EMS-GRIVORY、美国艾万提Avient
主要牌号：POKETONE、GRINYL K、Edgetek PKE
包装规格：原厂原包，分大包装与小包装两种；小包副牌、箱装副牌、大包料/吨包料分档码放，按批量备货
仓库现货：POK副牌仓库现货4000吨上下
现货明细：小包副牌备货600-900吨、箱装副牌备货250-450吨、大包料/吨包料备货2650-3150吨
供应保障：检测单随货，出厂化验单随机同行，到货可对着单据复核
选型口诀与一个柳州案例
选型口诀：
燃油直触、承压关键件，认正牌；
一般耐磨、非承压件，副牌能降本；
耐燃油浸泡、耐磨先留样；
熔指、结晶速度先调工艺；
主供认晓星POKETONE原厂原粒。
柳州那家做汽车燃油系统部件的厂，把一个燃油管接头从PA66换成晓星POKETONE的副牌，先做燃油浸泡和耐磨留样再上量产，接头磨耗和渗油问题几乎解决，还比PA66加内衬省了一道工序。这就是选对独苗料原厂副牌的价值——不是POK太贵用不起，是你得知道它那点"脾气"该在哪一档用。宁波市科隆新材料有限公司调配进口POK副牌多年，汽车燃油件的案子处理不少。
POK副牌是正牌的"耐磨陪练"——同一根CO和烯烃交替的分子链上长出来，只是熔指和结晶数据在化验单上轻飘了半格，跑燃油管照样扛造。
"Engineer Zhang, the wear parts of this fuel system—PA66 keeps wearing out and even leaking oil. What exactly should we replace them with?"
You try POK.
POK? Another new item, is it expensive? Does the sub-brand have anything reliable?
It's a bit expensive, but this material is basically mass-produced by only one company in the world. For the sub-brand, you have to use the original manufacturer's original pieces; don't look for them randomly.
This conversation is pretty much a typical exchange between automotive fuel system parts procurement and engineers. There’s a factory in Liuzhou, Guangxi, that makes automotive fuel system components, and they get stuck at this point in the conversation—their fuel pipe connector, made of PA66, wears poorly and has mediocre oxygen barrier performance. When the engineer mentions POK, the procurement’s first reaction is, 'I’ve never even heard of this material, can we use a second-tier brand?'
POK (polyketone) is niche and almost monopolized, so the pitfalls are naturally concentrated on whether you can recognize the original manufacturer’s pellets. Today, let's thoroughly explain POK.
What is POK, and who is supplying it?
POK, scientifically known as Polyketone, is a semi-crystalline aliphatic engineering plastic with a main chain composed of alternating carbon monoxide and olefin. Its key features are impact resistance, wear resistance, chemical resistance, fuel resistance, good gas barrier properties, and it is environmentally friendly — free of formaldehyde and acrylonitrile, with food and medical-grade grades that can pass FDA standards. It is widely used in automotive fuel systems, wear-resistant gears, water management components, and food contact parts.
POK is a niche category that is almost oligopolistic, with the main global foreign players ranked by actual tier as follows:
Hyosung (Hyosung, South Korea): POKETONE is its flagship product, the world's first company to commercialize and mass-produce aliphatic polyketone. The Ulsan Yongyeon factory has an annual production capacity of 50,000 tons and has been in commercial production since 2015, basically dominating supply in this category;
EMS-GRIVORY (Switzerland): GRINYL K polyamide series, enhanced and flame-retardant grades based on patented technology, mainly featuring low emissions and chemical resistance;
Avient (USA): Edgetek PKE series of polyketone modified materials, positioned as a nylon alternative with a low carbon footprint.
In the early years, companies like Shell, DuPont, and Kuraray had technical layouts in polyketone, but the only one that has truly scaled up aliphatic polyketone on a large scale so far is Xiaoxing, dominating the field, while the other two play a supplementary and modification role.
What is a secondary card, the boundary of a sole seedling material
The concept of POK subsidiary brands is still the same set.
Definition: Within the same manufacturer and the same brand, the portion that does not fully meet the official brand's specifications during factory inspection. For the same batch of polymer, products that meet the standards are labeled with the official brand, while individual indicators that fluctuate slightly are considered sub-brand.
Four major sources: leftover material from starting and stopping production, transition material from grade switching, batches with slight exceedance of melt index/crystallinity/one parameter due to process fluctuations, and leftover material from secondary lines.
It is still the original factory's native aggregated particles, with a molecular structure identical to the genuine brand. The distinction from recycled and reprocessed materials:
| Type | Source | Quality | Typical uses |
|---|
| Authentic brand | Original factory standard batch | All indicators meet the standards, batch stability | Fuel system, wear-resistant load-bearing parts |
| Side deck | Factory batch not fully up to standard | Some indicators slightly deviate, the substrate is of the same origin | General wear-resistant parts, non-pressure-bearing structural parts |
| Recycled material / Sprue material | Regranulation of processed scraps | Has undergone one heat history | low-specification product |
| Recycled material | Recycled Plastic Pelletizing | Performance fluctuates greatly | low-end filling |
The POK main chain is formed by alternating emissions of carbon and carbon monoxide, resulting in dense crystallization; the foundation of wear resistance and fuel resistance lies in this. As long as the base material of the sub-brand is made from original factory pellets, this foundation still exists.
Xiaoxing POKETONE: The almost sole main supplier
Xiaoxing POKETONE is basically the sole supplier among aliphatic polyketones. The Ulsan factory has an annual production capacity of 50,000 tons, covering grades from unreinforced, glass fiber reinforced, flame-retardant, to food and medical grades (F-grade approved by FDA, NSF, USP Class VI). It is most widely used in fuel system connectors, wear-resistant casters, and water management components.
Its secondary brand floating items are commonly melt index and crystallization speed, while the main trunk performance of impact resistance and fuel resistance remains. For non-pressure general wear-resistant parts and structural parts that do not directly contact fuel, this secondary brand is sufficient; for fuel system pressure-bearing, wear-critical parts, you need to use the primary brand or carefully selected secondary brand. Packaging is divided into large packages and small packages, distributed according to batch quantity.
Applicable scenarios: fuel system components, wear-resistant parts, water management.
EMS-GRIVORY GRINYL K: Swiss Supplementary File
The GRINYL K polyketone series from EMS-GRIVORY follows a patented technology route, offering unreinforced, reinforced, and flame-retardant grades, emphasizing low emissions, chemical resistance, and UL94 V0 flame retardancy. Its volume is not as large as Xiaoxing's, and it is positioned as a supplementary and differentiated product.
This sub-brand is suitable for peripheral parts that require flame retardancy and low emissions. For mainstream fuel system components, the Xiaoxing POKETONE channel is still more reliable and offers a more complete range of grades.
Applicable scenarios: flame-retardant peripheral components, low-emission parts.
Avient Edgetek PKE: Modified Blended Grade
The Edgetek PKE series from AiwanTi is a polyether ketone (PEK) modified material, positioned as a nylon replacement with a lower carbon footprint, suitable for chemically corrosive and corrosion-resistant conditions. This grade is a modified blend, not the original factory's virgin polymer, so you need to keep an eye on secondary brands. It can be used for general wear-resistant parts, but don't gamble with key pressure-bearing components in fuel systems with this grade.
For procurement, the only truly reliable main supplier of POK is Xiaoxing POKETONE, the other two are supplementary.
Pitfall to Avoid: What Fuel Components Fear the Most
POK subsidiary makes automotive fuel system parts, three pits.
1. Don't treat modified compounded materials as original factory pellets. The main supplier of POK is Xiaoxing, and the secondary brand must also use the same grade of original factory pellets from that company. The flame retardancy and batch stability of modified compounded materials may not be sufficient.
2. Abrasion resistance and fuel resistance should be tested according to working conditions. Fuel directly contacting and pressure-bearing parts need immersion and abrasion sampling tests. Melt index being up does not equal passing the working condition requirements.
3. Melt flow index and crystallization rate come first for the process. Secondary brands often fluctuate in these two aspects; adjust the injection molding process window steadily before mass production.
Cologne warehouse stock | POK verifiable
Main promoted brands: South Korea Hyosung, EMS-GRIVORY, United States Avient
Main brands: POKETONE, GRINYL K, Edgetek PKE
Packaging specifications: Original factory packaging, available in large and small packs; small packs are sub-branded, boxed sub-branded, large pack materials/ton bags are graded and stacked, stocked according to batch quantity.
Warehouse stock: POK sub-brand warehouse stock around 4000 tons
Spot details: Small bag secondary brand stock 600-900 tons, boxed secondary brand stock 250-450 tons, large bag material/ton bag material stock 2650-3150 tons
Supply Guarantee: Test sheet accompanies the goods, factory inspection certificate randomly sent with the goods, and it can be checked against the documents upon arrival.
Selection Mnemonic and a Liuzhou Case
Selection Tip:
For fuel direct-contact and pressure-bearing critical components, ensure they are genuine brand.
Generally for wear-resistant, non-pressure parts, secondary brands can reduce costs;
For fuel-immersion resistance and wear resistance, sample testing should be done first;
For melt flow index and crystallization rate, the process should be adjusted first;
The main supplier recognizes Xing POKETONE's original factory granules.
That factory in Liuzhou that makes automotive fuel system components switched a fuel pipe connector from PA66 to a secondary brand of Xing POKETONE. They first conducted fuel immersion and wear resistance sample testing before going into mass production. The connector's wear and oil leakage problems were almost resolved, and it even saved a process compared to PA66 with lining. This is the value of choosing the right original-secondary material—not that POK is too expensive to use, but you need to know which 'temperament' to use in which application. Ningbo Kelong New Materials Co., Ltd. has been compounding imported POK secondary brands for many years and has handled many automotive fuel part cases.
POK secondary brand is the "wear-resistant training partner" of the original brand—growing on the same alternating molecular chains of CO and olefins, only the melt flow index and crystallization data float slightly on the test report, but it still withstands use in fuel pipes.
