车间里这段对话，干光学的大概率听过。
采购问：这批新到的透明料，怎么注塑出来的导光板边缘发雾，客户那边又要退？
工程师蹲在机台边看了半天：你买的是COP还是COC？牌号对上没有？
采购翻进货单：都说是"日本透明光学料"，一吨比正牌便宜八万。
工程师摇头：问题不在便不便宜，在你连自己买的是哪条工艺线的料都没搞清。
这段对话里，藏着COP这个品类一个大坑：它跟COC长得像、都透明、都做光学件，但工艺路线不同、副牌飘的指标不同，混用就是给自己埋雷。今天把COP单独拎出来讲透。
COP和COC不是一回事
很多人把COC和COP混着叫，其实差一个工艺。
COC是把乙烯和环状单体加成共聚出来的。COP是把环状单体先开环聚合，再加氢还原出来的。两条路线，最后都得到高透明、低双折射的非晶塑料，但分子链细节不一样。
COP的强项在光学。它的双折射率特别低，导光均匀，做相机镜头、做手机镜头的塑胶镜片、做显示背光模组的导光板，比COC还顺手。它还耐伽马、耐化学，医疗光学件也用它。
但COP比COC更小众。全球能稳定量产高端COP的，基本就是日本那几家。
全球做COP的，瑞翁一家独大
按产能和高端光学份额排，全球COP的供给格局比COC还集中。下面三家，是绕不开的主供。
第一家，瑞翁（Zeon Corporation）。 日本瑞翁是全球最早把COP工业化的厂，品牌叫Zeonex和Zeonor。它的产能约4万多吨一年，扩产后还要往上加，在全球COP产能里占了差不多一半，高端光学领域的份额更高。瑞翁走的是开环聚合再加氢路线，Zeonex主打高透明低双折射的光学级，Zeonor主打耐湿热的注塑级。手机镜头、车载镜头、微型棱镜，背后都有瑞翁的影子。说COP绕不开瑞翁，这话不夸张。
第二家，JSR（日本合成橡胶）。 JSR的Arton系列，前面COC那篇提过。它用的也是开环聚合路线，在COP阵营里占一席之地。Arton的特点是耐热和耐化学比瑞翁还猛一点，做光学膜的涂层、做半导体相关的透明件有差异化。产能不大，约五千吨一年，但高端膜材里辨识度高。
第三家，三井化学（Mitsui Chemicals）。 三井的APEL系列，虽然以COC路线为主，但它也有覆盖光学应用的共聚牌号。在COP这个细分里，三井靠牌号齐全、供应稳定占住第三档。做光学件想多源备份，三井是常被拉进来的那家。
这个品类就是这么集中：瑞翁一家往下压，JSR和三井在后面补位。
副牌通识：COP副牌飘在哪
COP副牌的道理跟其他料一样：同一厂家同一牌号聚合出来，出厂检验个别指标没踩中正牌下沿，就是副牌。四大来源——开停车头尾料、牌号切换过渡料、正常生产中熔指/透光/双折射小幅飘移的批次、副线尾料。它还是原厂原生粒子，分子链跟正牌同源，不是回收再造粒。
但COP副牌有个特殊点：它飘的指标，往往恰恰是光学件很敏感的那几项——透光率、双折射、厚度方向的相位差。所以COP副牌能不能用，关键看你的件对这几项敏不敏感。
做高解析镜头、做AR眼镜的光波导件，这些对双折射零容忍，副牌别碰。做导光板的非主光区、做光学护罩、做显示屏的边框透明件，副牌只要指标在控制范围内，完全能上。
边界还是那条：正牌全达标、批次稳；副牌个别指标小幅飘、基材同源；回料是边角料再造粒、受过二次热历史；再生料是废旧回收、波动大。别拿后两者冒充COP副牌。
瑞翁的副牌，光学件怎么接
瑞翁Zeonex/Zeonor的副牌，主要飘在双折射和透光率这两项。
做导光板，主入光区要正牌，副牌打副光区和边框，光程短的位置双折射差一点看不出来。做光学护罩、做仪器面板的透明视窗，副牌足够。瑞翁副牌走大包装为主，进光学制品厂料仓，料粒跟正牌肉眼难分，看原厂包装标识。
JSR Arton的副牌，量小价高
Arton本身产能小，副牌流出量有限，市面上货紧。它的副牌多用于光学膜的非关键层、做显示件的内结构。遇到Arton副牌，先确认牌号和飘移指标，别拿它去冲镜头级应用。
三井APEL的副牌，做备份料很合适
三井APEL的副牌，熔指和耐热温度可能小幅飘。它适合做光学件的备份供应源——主供用瑞翁正牌，辅线用三井副牌，非关键件分流出去，把成本压下来。APEL副牌换上去不用大改配方，验一遍敏感指标就能上机。
副牌选购避坑：光学件三件事
第一，分清COC和COP。两条工艺线的料不能混用，导光板用COC做可能光程不对，做前先确认牌号背后的工艺。
第二，双折射和透光先测。光学件副牌进厂，这两项必须留样测，相位差用仪器卡，别靠眼睛看。
第三，大包装小包装按批量来。打样用小包装，量产用大包装摊薄成本，别在规格上吃亏。
科隆仓库现货｜COP防潮
主推品牌：日本瑞翁Zeon、JSR、日本三井化学
主要牌号：Zeonex/Zeonor、Arton、APEL
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：COP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
选型口诀和一个真实案例
正牌COP贵到一片导光板不敢报价，回料COP雾得像磨砂玻璃，大厂副牌COP刚好把双折射率那道关踩稳。
做COP副牌选型，记住这五条：一看件对双折射敏不敏感，二分清COC还是COP，三验透光和相位差，四按批量选大小包装，五留批次留样。
说个案例。抚顺有家做车载光学件的厂，之前做仪表盘导光板，一直用瑞翁Zeonor正牌，一吨料三十几万，一块导光板的材料成本占比压不下来。换过一批便宜的透明料上机，结果导光不均、边缘发雾，客户那批件整批判退，损失不小。后来我们给它配了瑞翁同牌号的副牌，双折射在控制范围、透光率差零点几个点，主光区继续用正牌，副光区和边框用副牌。调整之后，这块件的材料成本降了一截，导光均匀性客户验收通过，批次良率稳在九成六。
这就是COP副牌的用法——不是全盘替换，是把对指标不敏感的区域分流出去。宁波市科隆新材料有限公司做进口副牌多年，COP、COC这类光学高透明料，类似的分流配比每年调不少，说白了就是帮你把镜头和导光板的成本，在量产之前算明白。
做光学件、做镜头、做导光板的，谁还没被COP的高价压过？是正牌一片镜片不敢报价？还是图便宜进了发雾的回料？或者副牌买回来发现COC和COP混了？
资料与数据来源
Dataintelo《Cyclic Olefin Polymer (COP) Market》市场研究报告（2026）
PROCESS流程工业《国内首套COP项目宁波动工，打破海外高端材料垄断》（2026-06）
24ChemicalResearch《Optical Grade COC/COP Market》（2026-08）
Chemical Research Insight《Top 10 Companies in the COP Industry 2026》
中国化工信息周刊《COC/COP国产替代加强，市场空间广阔》（2025-12）
数据
Optics, you've most likely heard this conversation in the workshop.
Procurement asks: Why does the edge of the injection-molded light guide plate fog up with this newly arrived transparent material, and the customer wants to return it?
Engineer squatted by the machine and looked for a long time: Did you buy COP or COC? Does the grade match?
Procurement checks the order of goods: Everyone says it's 'Japanese transparent optical material,' 80,000 yuan cheaper per ton than the genuine brand.
Engineer shakes his head: If the problem isn't there, it's not cheap. You don't even know which process line you bought from.
In this conversation, there's a big pitfall in the COP category: it looks similar to COC, both are transparent, and both are made as optical components, but their process routes and secondary product float indicators differ. Mixing them is just setting a trap for yourself. Today, I'll take COP out and explain it thoroughly.
COP and COC are not the same thing.
Many people mix COC and COP together, but actually they're just one process difference.
COC is made by copolymerizing ethylene with cyclic monomers. COP is made by first opening the ring polymer, then adding hydrogen to reduce it. Both routes ultimately result in highly transparent, low-birefringence amorphous plastics, but the molecular chain details are different.
COP's strength lies in optics. Its birefringence index is especially low, light is uniform, and it's even more convenient for making plastic lenses for camera lenses, mobile phone lenses, and light guide plates for display backlight modules—even more convenient than COC. It's also gamma- and chemical-resistant, and is used in medical optical components.
But COP is even more niche than COC. Globally, only a few companies can stably mass-produce high-end COP.
Globally, COP-making is dominated by Ruion .
Ranked by capacity and high-end optical share, the global COP supply is even more concentrated than COC. The following three are the main suppliers you can't ignore.
First, Zeon Corporation. Japan's Zeon Corporation is the world's earliest manufacturer to industrialize COP, with brands Zeonex and Zeonor. Its annual capacity is about 40,000 tons, with further increases after expansion, accounting for nearly half of global COP capacity and a higher share in high-end optics. Zeonex takes an open-loop polymer-and-hydrogen route, Zeonex focuses on high-transparency, low-birefringence optical grade, and Zeonor focuses on injection-molded grade resistant to moisture and heat. Mobile phone lenses, automotive lenses, and micro prisms all bear the influence of Ruion. Saying COP can't avoid Ruion, and that's no exaggeration.
The second company, JSR (Japanese synthetic rubber). JSR's Arton series was mentioned in the previous COC article. It also uses an open-loop polymerization approach and holds a place in the COP camp. Arton's features are heat and chemical resistance, which is stronger than Ruion, differentiated in coatings for optical films and semiconductor-related transparent parts. Its capacity is not large, about 5,000 tons per year, but it is highly recognizable among high-end film materials.
The third company, Mitsui Chemicals. Mitsui's APEL series, although mainly COC routes, also has copolymer grades covering optical applications. In the COP segment, Mitsui occupies the third tier thanks to its complete range of grades and stable supply. For optical components seeking multi-source backup, Mitsui is often the one to be pulled in.
This category is concentrated like this: Ruiweng's family pushed downward, JSR and Mitsui filled the gap.
Secondary Brand Knowledge: Where do COP secondary plates float
COP The principle behind secondary plates is the same as other materials: same manufacturer and same grade aggregated together, and if some factory inspection indicators don't hit the lower edge of the genuine brand, it's the secondary brand. The four main sources are the starting and parking front and tail materials, grade switching transition materials, batches with slight drift in melt finger/translucency/birefringence during normal production, and auxiliary line tailings. They are still original factory particles, with molecular chains from the same origin as genuine brands, not recycled pellets.
But COP secondary cards have a special feature: the indicators they float on are often exactly the few things optical components are very sensitive to—light transmittance, birefringence, phase difference in thickness direction. So whether a COP secondary brand can be used depends on whether your part is sensitive to these factors.
For high-resolution lenses and AR glasses light wave guides, these have zero tolerance for birefringence, avoid secondary cards. For non-primary light areas of light guide plates, optical shields, and transparent border parts for displays, as long as the indicators are within control, the secondary brand can be used.
The boundary is still the same: all genuine brands meet standards, batch quality is stable; Secondary cards have slight fluctuations in some indicators, same base material; Reclaimed material is scrap material re-granulated and subjected to secondary heat history; Recycled material is recycled waste and has high fluctuations. Don't use the latter two as COP secondary cards.
Zeonex's secondary brand, how to connect optical components ?
Zeonex/Zeonor's secondary cards mainly focus on birefringence and light transmittance.
for light guide plates, the main light entry area must be genuine, the secondary light area and frame should be used, and the short optical path positions should have double refraction barely noticeable. For optical shields and transparent windows on instrument panels, secondary brands are sufficient. Ruiyong's secondary brand mainly comes in large packaging, entering the optical product factory's silos. The granules are hard to tell from the genuine brand, so check the original packaging label.
JSR Arton's secondary brand is small in quantity and expensive
Arton with limited production capacity, limited secondary brand outflow, and tight supply on the market. Its secondary brand is mostly used for non-critical layers of optical films or for the internal structure of display components. When encountering Arton secondary brands, first confirm the grade and drift indicators; don't use them for lens-grade applications.
Mitsui APEL's secondary brand, very suitable as backup material
Mitsui APEL secondary brand, melt finger and heat resistance may fluctuate slightly. It's suitable as a backup supply source for optical components—main supply uses genuine Ruiong brand, auxiliary auxiliary lines use Mitsui, non-critical parts are diverted out to reduce costs. Replace APEL secondary brand without major recipe changes; just test sensitive indicators and it's ready to use.
Secondary brand selection pitfalls: Three things to do for optical components
First, distinguish between COC and COP. Do not mix materials for two process lines; using COC for light guide plates may cause optical path errors. Before manufacturing, confirm the process behind the grade.
Second, test birefringence and light transmission first. When sub-brands of optical components arrive at the factory, these two items must be sampled and tested; phase differences are measured by instrument cards, not by eye.
Third, large and small packages are sold in batches. Use small packages for prototyping, and large packages for mass production to dilute costs. Don't lose out on specifications.
Cologne warehouse in-stock | COP moisture-proof
Main recommended brands: Zeon (Japan), JSR, Mitsui Chemicals (Japan )
Main grades: Zeonex/Zeonor, Arton, APEL
Packaging specifications: original factory packaging, available in large and small packaging; Small parcel sub-brand, boxed sub-brand, large package/ton material sorted and stacked, stocked according to batch
warehouse stock: COP sub-brand warehouse stock around 4000 tons
Spot details: Small package secondary brand stock 600-900 tons, boxed secondary brand stock 250-450 tons, large package/material per ton stock 2650-3150 tons
Supply Guarantee: Test reports accompany the goods, factory inspection reports randomly accompany, and upon arrival, they can be checked against the documents.
Selection mnemonic and a real case
The genuine COP is so expensive that they don’t dare to quote for a single light guide plate, recycled COP is as frosted as matte glass, and the subsidiary brand COP from a major factory just manages to hit the birefringence threshold.
When choosing COP for a secondary brand, remember these five points: first, check whether the material is sensitive to double refraction; second, distinguish between COC and COP; third, test light transmittance and phase difference; fourth, select the package size according to the batch volume; fifth, keep samples from each batch.
Let me give an example. There’s a factory in Fushun that makes automotive optical components. They used to produce instrument panel light guide plates and always used genuine Zeonor from REON, which cost over 300,000 yuan per ton. The material cost for a single light guide plate couldn’t be reduced. They once tried a batch of cheaper transparent material, but the result was uneven light guiding and hazy edges. The client rejected the entire batch, causing significant losses. Later, we supplied them with a secondary brand of REON with the same grade: birefringence was within control limits, and light transmittance differed by only a few tenths of a percent. The main light area still used the genuine brand, while the secondary areas and edges used the secondary brand. After these adjustments, the material cost of a single piece was significantly reduced, light uniformity passed client inspection, and batch yield stabilized at 96%.
This is how COP sub-brands are used — it's not a complete replacement, but rather diverting areas that are insensitive to the indicators. Ningbo Kolon New Materials Co., Ltd. has been making imported sub-brands for many years. For COP, COC, and other high-transparency optical materials, similar diversion ratios are adjusted quite a bit every year. In simple terms, it helps you calculate the cost of lenses and light guide plates clearly before mass production.
Those who make optical components, lenses, and light guides, who hasn't been crushed by COP's high prices? Is it that the genuine brand can't even quote for a single lens? Or did you try to save money and end up with foggy recycled material? Or did you buy from a secondary brand only to find COC and COP mixed together?
Sources of information and data
Dataintelo 'Cyclic Olefin Polymer (COP) Market' Market Research Report (2026)
PROCESS Process Industry 'China's First COP Project Starts Construction in Ningbo, Breaking the Monopoly of High-End Overseas Materials' (2026-06)
24ChemicalResearch 'Optical Grade COC/COP Market' (August 2026)
Chemical Research Insight 'Top 10 Companies in the COP Industry 2026'
China Chemical Information Weekly 'COC/COP Domestic Substitution Strengthened, Market Space is Broad' (2025-12)
Data
