每年这个时候，做LED灯杯反射器的厂就要开始头疼了：一批薄壁反射器过完回流焊，黄的黄、翘的翘，光反射率一测掉一大截。客人要的是白光透亮、尺寸端正，你交出去的是一圈发黄的"小碟子"。
问题往往不出在注塑师傅的手艺，而出在料。LED反射器要过无铅回流焊，炉温两百六十度往上走两三次，普通高温尼龙一进去就软、就变形、就变色。能扛住这种折腾的，一只手数得过来，PA4T就是其中最狠的那一档。
可PA4T正牌贵，薄壁件用料又省不下来，做反射器的老板们一边骂娘一边找副牌。找来找去发现一个尴尬的事实：这料全世界真正能量产纯树脂的，几乎就一家。
PA4T：把酰胺密度堆到顶的那种狠人
PA4T叫聚对苯二甲酰丁二胺，单体是丁二胺加对苯二甲酸。它把碳链压到最短的"4"，再把芳香环请进来，酰胺密度极高、结晶又快，熔点和刚性都顶在高温尼龙的天花板附近。它最关键的本事，是过无铅回流焊不变形、阻燃能做到很薄的壁厚也过V-0，CTI还高——这正是LED反射器、SMT连接器要的东西。
但这个品类的格局，比PA46还要极端。按行业资料，真正具备PA4T规模化量产能力的，全球基本只有恩骅力（Envalior）一家，牌号ForTii®。它握着那套"C4二胺"技术——也就是生物基路线的丁二胺——从单体到聚合全攥在手里，别人想进，连原料这一关都难。所以下面不硬凑三家"同级玩家"，按真实梯队讲：一家独大，外加两家用相邻材料抢应用的外围对手。
副牌通识：同一配方里没踩线的那一档
还是先把概念校准。
副牌不是次品，不是回料，更不是掺了东西的便宜货。它是同一厂家、同一牌号里，出厂检验时个别指标没完全踩线的那一批。聚合同一条线，分子结构和正牌一致，可能熔指偏一点、色相差半度、反射率相关指标多飘了一格，但仍是原厂原生粒子。
来源四类：开停车头尾料、牌号切换过渡料、个别指标小幅飘移的批次、副线尾料。同牌号副牌分精选副、普通副，价格通常低于正牌。
| 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 | 高要求件、认证件 |
| 副牌 | 原厂未完全达标批次 | 个别指标小幅偏离，基材与正牌一致 | 内件、一般结构件 |
| 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 | 低端制品、填充 |
恩骅力ForTii：PA4T这桌饭，基本是它一人开的
ForTii®就是PA4T的当家牌号。它用"C4二胺"做出高结晶形态，高温刚性和机械强度在同类里拔尖，尺寸稳、和无铅回流焊兼容得好，阻燃牌号0.2毫米壁厚都能过V-0，CTI八百伏往上。LED反射器、电子电气的耐热件，大量是它。
副牌方面，ForTii的副牌多出在色相或流动性小幅偏离的批次。对做非高光、一般照明反射器的厂，挑精选副，过回流焊不变形这本事还在。包装既有大包装也有小包装，打样和量产按用量选。要留神：因为独大，市面仿冒和"同名不同料"的货不少，认准原厂原包、要批号，别贪那种低得离谱的价。
可乐丽Genestar（PA9T）：不做PA4T，却抢它的活
严格说，日本可乐丽的Genestar®是PA9T，不是PA4T。但在LED反射器、SMT连接器这种"要低吸水、要回流焊"的战场上，它俩经常同台竞标。Genestar吸水率低、成型好，反射器和连接器都在用。
对预算紧张、又想绕开ForTii高价的厂，Genestar的副牌是个对位替代思路——前提是你的工况它吃得下。它的副牌同样来自批次指标小幅偏离，基材和正牌同源。
三井化学ARLEN（PA6T）：另一条对位路线
日本三井化学的ARLEN®是PA6T体系，也不是纯PA4T，但它在耐热、低吸水、成型性上做了平衡，对着SMT无铅焊接的电子件。熔点做到三百二十摄氏度，流动性也好。
它的副牌料来源和别家一致，适合已经在用PA6T体系、想压成本的反射器和连接器厂。换料要重新过回流焊验证，别直接拿PA4T的工艺套。
PA4T副牌上手前，想清楚你到底要扛什么
PA4T副牌最大的坑，是"以为买了PA4T就能解决一切"。第一，纯PA4T副牌流通量本来就小，市场上更多是相邻材料的副牌，先把牌号和材料体系认死。第二，反射器件必过回流焊炉温曲线实测，别只看TDP表。第三，吸潮照样预干燥，薄壁件烘不到位直接起泡。第四，反射率、黄度要逐批留样测，色相类副牌尤其要盯。
说白了，这料不是买回去就赢，验证过才算数。
科隆仓库现货｜PA4T批次
主推品牌：恩骅力Envalior、日本可乐丽Kuraray、日本三井化学
主要牌号：ForTii、Genestar、ARLEN
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：PA4T副牌仓库现货5000吨左右
现货明细：小包副牌备货800-1000吨、箱装副牌备货300-500吨、大包料/吨包料备货3500-3900吨
供应保障：先测后签，进厂先把关键指标测一遍，对上用途再签合同
PA4T副牌对上薄壁节拍，一批比一批稳
口诀收好：
要过无铅回流焊、薄壁耐热——上PA4T/PPA，别用普通尼龙硬扛；
高光反射率件、认证件——正牌，别省；
一般照明反射器、非高光件——可看副牌，先炉温实测后量产；
先认死材料体系和牌号，PA4T、PA9T、PA6T别混；
回流焊炉温曲线逐批实测，黄度、反射率留样；
薄壁件照样预干燥，防起泡；
认准原厂原包、要批号，打样走小包装，量产走大包装。
遵义有家做LED反射器的客户，之前图便宜用普通高温尼龙顶，过完回流焊，一批里发黄翘曲的超过15%，反射率合格率跌到六成。后来换了进口PA4T副牌，按反射器壁厚重做炉温曲线、逐批复测黄度和反射率，合格率拉到98%以上，单件料成本还比正牌ForTii低了一截。这就是对位选型的账——料对了，良率才稳。宁波市科隆新材料有限公司常年帮反射器、连接器厂筛进口高温尼龙副牌，类似案子一年处理不少，说白了就是把"回流焊一过就发黄"这种事，在打样阶段就掐掉。
做反射器的、做灯杯的、做SMT件的，谁还没被回流焊坑过？是过完炉黄了一圈？还是薄壁件翘得对不上镜头？或者副牌色相一批一个样？
资料与数据来源
本文头部企业信息综合自恩骅力Envalior官网（ForTii® PA4T产品页）、浙江省塑料行业协会PA4T技术解析、可乐丽Kuraray官网（Genestar® PA9T）、三井化学官网（ARLEN® PA6T）及第三方高温尼龙市场报告（2024—2026）交叉核对。PA4T纯树脂量产企业较集中，按实际梯队呈现，不硬排同级前三。资料
At this time of year, factories that make LED lamp cup reflectors start to get headaches: after a batch of thin-walled reflectors goes through reflow soldering, some turn yellow, some warp, and their light reflectivity drops significantly. Customers want bright white light and precise dimensions, but what you deliver is a batch of yellowing 'little dishes'.
The problem often doesn't lie in the skill of the injection molding technician, but in the material. LED reflectors need to go through lead-free reflow soldering, with the oven temperature going up to 260 degrees or higher two or three times. Ordinary high-temperature nylon softens, deforms, and discolors immediately. There are only a few materials that can withstand this kind of treatment, and PA4T is among the toughest of them.
But genuine PA4T is expensive, and the material for thin-walled parts cannot be spared, so the bosses making reflectors curse while looking for alternative brands. After searching around, they discovered an embarrassing fact: in the whole world, there is almost only one company that can truly mass-produce pure resin with this material.
PA4T: The kind of hardcore person who pushes amide density to the max
PA4T is called poly(p-phenylene terephthalamide), and the monomers are butanediamine and terephthalic acid. It compresses the carbon chain to the shortest '4', then brings in the aromatic ring. The amide density is extremely high, it crystallizes quickly, and its melting point and rigidity are near the ceiling of high-temperature nylons. Its most crucial ability is that it does not deform during lead-free reflow soldering, can achieve flame retardancy even at very thin wall thicknesses to pass V-0, and has a high CTI—exactly what LED reflectors and SMT connectors need.
But the structure of this category is even more extreme than PA46. According to industry data, the only company in the world that truly has the capability for large-scale production of PA4T is basically Envalior, with the grade ForTii®. They have mastered the 'C4 diamine' technology — that is, the bio-based route to butanediamine — controlling everything from monomer to polymer. Others who want to enter the market would struggle even at the raw material stage. Therefore, instead of forcing a comparison among three 'peer players,' based on the actual hierarchy: one dominates the market, accompanied by two peripheral competitors using adjacent materials to compete for applications.
Sub-card common sense: the tier in the same formula that hasn't crossed the line
Let's first calibrate the concept.
The secondary grade is not a defective product, not recycled material, and certainly not a cheap product mixed with other substances. It is a batch from the same manufacturer and the same grade where, during factory inspection, certain indicators did not fully meet the standard. Aggregated from the same production line, its molecular structure is consistent with the primary grade, though the melt index may be slightly different, the color hue off by half a shade, or reflectivity-related indicators slightly higher, but it is still original factory raw material.
Four sources: leftover materials from starting and stopping production, transition materials from grade switching, batches with minor fluctuations in specific indicators, and subsidiary line leftover materials. For the same grade, secondary grades are classified into selected secondary and ordinary secondary, with prices usually lower than the main grade.
| Type | Source | Quality | Typical uses |
|---|
| Genuine brand | Original factory standard batch | All indicators meet the standards, batch stability | High-demand parts, certified parts |
| Side deck | Factory batch not fully up to standard | Individual indicators slightly deviate, base material is consistent with the genuine brand | Inner components, general structural parts |
| Recycled material / Sprue material | Processing scrap material into pellets | Has undergone one heat history | Low-demand products |
| Recycled material | Recycled Plastic Pelletizing | Performance fluctuates greatly | Low-end products, fillers |
Enhuali ForTii: PA4T started this meal alone, basically.
ForTii® is the flagship grade of PA4T. It uses 'C4 diamine' to achieve a high-crystallinity form, with top-notch high-temperature rigidity and mechanical strength in its class. It has stable dimensions, is compatible with lead-free reflow soldering, and the flame-retardant grade can pass V-0 even with a 0.2 mm wall thickness and has a CTI above 800 volts. It is widely used in LED reflectors and heat-resistant components in electronics and electrical applications.
Regarding the secondary cards, ForTii's secondary cards mostly come from batches with slight deviations in hue or fluidity. For factories producing non-high brightness, general lighting reflectors, they can still pick and sort the secondary cards, and they have the skill to pass through reflow soldering without deformation. There are both large and small packaging options, and sampling and mass production should be chosen based on the amount needed. Be cautious: because it is dominant in the market, there are quite a few imitations and 'same name, different material' products. Make sure to choose the original manufacturer and original packaging, check the batch number, and don’t be tempted by prices that are ridiculously low.
Colpoly Genestar (PA9T): Not making PA4T, but taking its business
Strictly speaking, Japan's Kolon Genestar® is PA9T, not PA4T. But in battlegrounds like LED reflectors and SMT connectors, where 'low water absorption and reflow soldering' are required, the two often compete side by side. Genestar has low water absorption and molds well, and it is used in both reflectors and connectors.
For manufacturers with tight budgets who also want to avoid ForTii's high prices, Genestar's sub-brand is an alternative option—provided your operating conditions are suitable for it. Its sub-brand similarly comes from slight deviations in batch specifications, and the base material is the same as the main brand.
Mitsui Chemicals ARLEN (PA6T): Another Para-Route
ARLEN® from Mitsui Chemicals Japan belongs to the PA6T system and is not pure PA4T, but it balances heat resistance, low water absorption, and moldability, and is suitable for SMT lead-free soldering electronic components. Its melting point reaches 320 degrees Celsius, and it also has good fluidity.
Its secondary material source is the same as others, suitable for reflector and connector manufacturers who are already using the PA6T system and want to reduce costs. Changing the material requires redoing reflow soldering validation; don’t directly apply the PA4T process.
Before getting started with the PA4T sub-card, think carefully about what you really want to take on.
The biggest pitfall of PA4T substitute brands is thinking that buying PA4T will solve everything. First, the circulation of pure PA4T substitutes is naturally small, and the market has more substitute brands of adjacent materials, so you need to first fix the grade and material system. Second, reflective devices must go through actual reflow soldering temperature curve testing, don’t just look at the TDP table. Third, moisture absorption still requires pre-drying; if thin-walled parts aren’t baked properly, they will bubble. Fourth, reflectivity and yellowness should be measured for each batch, and color-related substitutes especially need close monitoring.
To put it bluntly, just buying this stuff doesn't mean you'll win; it only counts after verification.
Cologne Warehouse Stock | PA4T Batch
Main promoted brands: Envalior, Kuraray (Japan), Mitsui Chemicals (Japan)
Main brands: ForTii, Genestar, ARLEN
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 sorted by grade and stacked, stocked according to batch quantity.
Warehouse stock: PA4T secondary brand warehouse stock around 5,000 tons
Stock Details: Small parcel sub-brand stock 800-1000 tons, container sub-brand stock 300-500 tons, large bulk materials/ton packaging stock stock 3500-3900 tons
Supply Guarantee: Test before signing, test key indicators before entering the factory, match usage before signing contracts
PA4T sub-brand with thin-walled beat, each batch is more stable than the last
Keep the mnemonic:
must pass lead-free reflow soldering and thin-wall heat resistant — use PA4T/PPA, do not use ordinary nylon for hard loading;
High reflectivity parts, certified parts — genuine brand, don't skimp;
General lighting reflectors and non-high-gloss parts—check the secondary brand, test furnace temperature before mass production;
First, identify the material system and grade; do not mix PA4T, PA9T, PA6T;
Reflow oven temperature curve measured batch by batch, keep samples for yellowness and reflectivity;
Pre-dried thin-walled parts as usual to prevent bubbles;
Make sure to use original factory packaging and batch number, use small packages for samples, large packages for mass production.
Zunyi has a client who makes LED reflectors. Previously, they used ordinary high-temperature nylon tops cheaply, but after reflow soldering, over 15% of the batch yellowed and warped, and the reflectance pass rate dropped to 60%. Later, they switched to imported PA4T secondary brands, re-examined the furnace temperature curve based on reflector wall thickness, and re-tested yellowness and reflectance batch by batch. The pass rate was raised to over 98%, and the cost per piece was even lower than the genuine ForTii. This is the accounting of alignment selection—the right material ensures stable yield. Ningbo Kelong New Materials Co., Ltd. has long helped reflector and connector factories screen imported high-temperature nylon secondary brands. They handle many similar cases annually. In other words, they eliminated the issue of "yellowing after reflow soldering" during the prototyping stage.
Reflector makers, lamp cups, SMT components—who hasn't had a reflow soldering pit? Did the pan turn yellow after the process? Or did the thin-wall parts curl up and don't match the lens? Or is the hue of the secondary brand uniformly the same?
Information and Data Sources
The top company information in this article is compiled from Envalior official website (ForTii® PA4T product page), Zhejiang Plastics Industry Association PA4T technical analysis, Kuraray official website (Genestar® PA9T), Mitsui Chemicals official website (ARLEN® PA6T), and third-party high-temperature nylon market reports (2024–2026) cross-checked. PA4T pure resin mass production enterprises are concentrated, presented according to actual tiers, not rigidly ranked among the top three in the same class. Information
