每年这个时候，做电子电器外壳和医疗配件的厂就开始头大：
客户要一批透明件，要求透光率够、抗摔、过跌落测试。正牌PC一吨报价下来，订单利润直接被削掉一块；换便宜的料吧，上机一烤，内应力没消干净，成品在仓库里自己裂成冰花纹。还有做医疗配件的，用了来路不明的料，客户一问原料牌号和认证，答不上来，整批货直接退。
这种翻车现场，每年都在上演。问题不出在PC这材料身上，出在你只知道"正牌贵、杂牌险"，却不知道中间还有个被低估的选项——PC副牌。
今天就把PC这个品类、全球三家靠得住的国外大厂，以及它们的副牌到底能不能碰，一次讲透。
PC：透明得像玻璃，硬得像铠甲
PC学名聚碳酸酯，工程塑料里的"透明硬汉"。透光率能到八成以上，接近玻璃，抗冲击却甩玻璃几条街，摔不碎；还能在一百多度的环境里长期扛着。安全帽镜片、手机外壳、汽车大灯、医疗透明器具，都是它的地盘。
全球PC产能高度集中，挤掉大陆厂商，海外阵营头部有：德国科思创Covestro、沙特基础工业SABIC、日本帝人Teijin，三菱工程塑料也在前排阵营边缘。按市场份额排，科思创常年排头排，招牌PC系列叫Makrolon；SABIC手里握着从GE接手来的LEXAN商标，跟科思创咬得很紧；帝人Teijin的Panlite在光学级、医疗级上份额靠前，常居第三档。不同研报口径下，第三名帝人和三菱工程塑料偶尔互换，但科思创和SABIC的头两席很稳。
PC副牌不是残次品，是透光率差那么零点几个百分点的原厂料
PC用副牌，先把概念立住。
副牌，是同一厂家同一牌号里，出厂检验没完全够着正牌指标的那部分。同一批聚合产物，全指标达标贴正牌，个别指标小幅偏离就是副牌。它还是原厂原生粒子，PC的分子结构跟正牌一致，不是废透明件打碎再造粒。
它从哪来？四个口子：装置开停车的不稳定料（头尾料）、牌号切换的过渡料、工艺波动导致透光率或色相或熔指小幅偏离的批次、副线尾料。
边界要分清：
| 类型 | 来源 | 品质 | 典型用途 |
|---|
| 正牌 | 原厂达标批次 | 全指标达标、批次稳定 | 医疗件、光学件、认证件 |
| 副牌 | 原厂未达标批次 | 个别指标小幅偏离，基材与正牌一致 | 一般透明件、外壳、结构件 |
| 回料/水口料 | 制品加工边角料再造粒 | 已受过一次热历史 | 低要求件 |
| 再生料 | 废旧塑料回收造粒 | 性能波动大 | 低端件、填充 |
PC副牌典型的偏离，就是透光率差零点几个百分点，或者色相略黄。这对光学镜片是硬伤，对普通外壳几乎无感。
科思创：Makrolon，PC圈子的"标准件"
德国科思创Covestro，从拜耳材料科技独立出来，是全球PC市场份额排在头排的厂家，招牌PC叫Makrolon，PC/ABS合金叫Bayblend。做透明件的，没几个没听过Makrolon这个商标。
科思创副牌的特点：牌号体系全、流出批次相对稳。偏离项常集中在透光率小幅下降或色相略黄上，但抗冲击和耐热这些PC的看家指标，副牌和正牌是一个底子。拿去做非光学透明件、电器外壳、一般防护件，透光率差那零点几，人眼根本看不出来，成本却能砍下来一截。适用场景：电子外壳、一般透明罩、防护件。
SABIC：LEXAN，从GE手里接过来的金字招牌
沙特基础工业SABIC，手握从GE收购来的LEXAN商标，PC全球份额紧咬科思创。背靠中东原料一体化，成本控制有底子。
SABIC副牌的特点：中高端牌号流出，常落在熔指或外观指标上，基材强度和阻燃底子好。它流出的副牌拿去做不需要过光学认证、但要有一定抗冲和耐热的电子电器件，很合适。医疗级副牌要单独挑——只有明确医疗认证批次的副牌才敢往医疗器械上用，别听供应商一句"都差不多"就上。适用场景：电子电器外壳、阻燃件、一般结构件。
帝人：Panlite，光学和医疗的精细派
日本帝人Teijin，招牌PC叫Panlite，在光学级、医疗级PC上份额靠前。它家规模不如前两家，但在低双折射、高纯度这种细分点上口碑扎实。
帝人副牌的特点：批次不大但料精，偏离项常集中在色相或熔指上，光学一致性好的批次偏多。拿去做对光学要求不苛刻、但对白度和外观有要求的透明罩、展示件、一般电子件，是降本的好手。适用场景：一般透明件、展示器材、电子配件。
挑PC副牌，这几个数字先盯死
PC副牌用得对不对，全看几个数字。
一看透光率偏离多少。光学件、镜片、镜头，透光率差零点几都不行，老老实实正牌；普通外壳、罩子，差一个百分点都无所谓。二看内应力。PC制品裂成冰花纹，十有八九是料没烘好、成型没退火，副牌基材本身没问题，但上机前含水率必须控住。三看认证用途。医疗件、食品接触件，副牌批次必须有对应认证背书，别拿工业级副牌冒充医疗级。四看包装溯源。正规大厂副牌分大包装、小包装流出，原厂袋和批次号要能对上。
还有个坑：PC吸潮，副牌料如果仓储不当，含水率上去，上机就是银丝气泡。到货先烘料，这步省不得。
科隆仓库现货｜PC库存
主推品牌：科思创、SABIC、帝人
主要牌号：Makrolon、LEXAN、Panlite
包装规格：大包装、小包装均有现货
仓库现货通常在5000吨左右：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
深圳那家做医疗外壳和电子件的，把透光率这笔账算精了
广东深圳有家做医疗设备外壳和电子透明件的厂，去年接了一批订单，客户既要透明抗摔，又压价压得狠。全用正牌Makrolon，利润见底；用杂牌料，医疗外壳客户一问原料认证，根本接不住。
后来他们把产品拆开看：外露的透明视窗和认证件继续用正牌保品质，内部外壳和非认证的透明结构件，切了一批科思创Makrolon副牌和帝人Panlite副牌，专挑透光率小幅偏离（人眼无感）、但抗冲和熔指达得底线的批次。上机前统一烘料、控制内应力，透光率实测离正牌只差0.5个百分点。
算下来，非认证件材料一吨省了六百多，这批订单整体成本降了大概一成二，良率稳在97%，客户验厂看的是正牌那部分，完全不受影响。这就是PC副牌的正确打开方式——不是拿它顶光学件、医疗认证件的活，是把"露脸要认证的用正牌、藏起来的透明件用副牌"分清楚。宁波市科隆新材料有限公司做进口PC副牌这些年，类似的搭配每年配不少，说白了就是帮你把一件产品里哪些件配正牌、哪些件配副牌，在量产前就分明白。
八句口诀，PC副牌怎么挑
1. 光学件、医疗认证件，老老实实用正牌；
2. 一般透明外壳、非认证件，才轮到副牌上；
3. 先认厂：科思创、SABIC、帝人，原厂流出才踏实；
4. 透光率差零点几的副牌，外壳件随便用，镜片件别碰；
5. 上机前必烘料，含水率控不住就是银丝气泡；
6. 医疗级副牌要认准认证批次，别拿工业级凑；
7. 包装看原厂标识，大包装小包装都要能溯源；
8. 小批量试机再放量，留样追批次。
做电子外壳的、做医疗配件的、做透明罩的，谁没在PC上翻过车？
是成品在仓库里裂成冰花纹？还是透明件黄得像老照片？或者图便宜进了批"副牌"，上机一烘全是银丝？
Every year around this time, factories making electronic and electrical enclosures and medical accessories start to get headaches:
The client wants a batch of transparent parts, requiring sufficient light transmittance, drop resistance, and drop tests. After quoting genuine PC per ton, the order profit is cut off by a chunk; Switch to cheaper materials, but after baking in the machine, the internal stress hasn't been fully resolved, so the finished product cracks into ice patterns in the warehouse. There are also medical accessories makers who use unknown materials. When customers ask about raw material grades and certifications, they can't answer and immediately return the entire batch.
This kind of failure happens every year. The problem isn't with the PC material, but because you only know "genuine brands are expensive, generic brands have risk," but don't realize there's an underestimated option in the middle—the PC sub-brand. Today,
will thoroughly explain the PC category, the three reliable global giants, and whether their sub-brands can be touched.
PC: Transparent like glass, hard like armor
PC Scientific name polycarbonate, the "transparent tough guy" among engineering plastics. Its light transmittance can reach over 80%, close to glass, yet its impact resistance is several miles away from glass without shattering; It can even withstand environments over 100 degrees Celsius for extended periods. Helmet lenses, phone cases, car headlights, medical transparent devices are all its territory.
Global PC production capacity is highly concentrated, pushing out mainland manufacturers. The overseas leaders include: Germany's Covestro, Saudi Basic Industry SABIC, and Japan's Teijin Teijin, with Mitsubishi Engineering Plastics also on the edge of the front row. By market share, Covestro has always been at the top, with its flagship PC series called Makrolon; SABIC holds the LEXAN trademark acquired from GE and is closely linked to Covestro; Teijin Teijin's Panlite holds a high market share in optical and medical-grade products, often ranking third tier. Under different research report criteria, Teijin and Mitsubishi Engineering Plastics occasionally swap third place, but Covestro and SABIC hold the top two spots very securely.
PC sub-brand is not a defective product; it is original material with a light transmittance of just a few percentage points
PC. Use sub-brand to establish the concept first.
Sub-brand refers to the part of the same manufacturer and grade that does not fully meet the genuine brand standards during factory inspection. For the same batch of polymerized products, if all indicators meet the standard, the genuine brand is labeled; if some indicators deviate slightly, it is the secondary brand. It is still original factory original particles; the molecular structure of PC is identical to the genuine brand, not recycled transparent parts crushed and pelletized.
Where does it come from? Four parts: unstable material used during unit operation and shutdown (head and tail material), transition material from grade changes, batch material with slight deviations in light transmittance, hue, or melting index caused by process fluctuations, and auxiliary line residue.
Boundaries must be clearly defined:
| Type | Source | Quality | Typical Use |
|---|
| Genuine Brand | Original Factory Standard Batch | All Indicators Compliant, Batch Stability | Medical Parts, Optical Parts, Certified Parts |
| Subbrand | Original factory non-compliant batch | Slight deviations in some indicators, substrate consistent with genuine brand | General transparent parts, housing, structural parts |
| Reused/sprue material | Product processing scraps repelled and granulated | Already experienced once heat history | Low requirement parts |
| Recycled Materials | Recycled Plastic Pelletizing | Large Performance Fluctuations | Low-end Parts, Filling |
PC Sub-brand, Typical Deviation is a difference of several percentage points in light transmittance, or a slightly yellowish hue. These optical lenses are a major flaw, almost indifferent to ordinary cases.
Covestro: Makrolon, the "standard part " in the PC community .
Covestro Germany spun off from Bayer MaterialScience and is one of the top global PC market shareholders. Their signature PC is called Makrolon, and their PC/ABS alloy is called Bayblend. Few who make transparent parts have heard of the Makrolon trademark.
Covestro secondary brand features: comprehensive grade system, relatively stable outflow batches. Deviations often focus on slight light transmission or slightly yellowish hue, but impact resistance and heat resistance are key PC indicators; secondary and genuine brands are the same base. If used for non-optical transparent parts, electrical housings, or general protective parts, the light transmittance is just a fraction of a fraction of a point off, so the human eye can't see it, but the cost can be cut by a bit. Applicable scenarios: electronic housings, general transparent covers, protective parts.
SABIC: LEXAN, the prestigious brand
Saudi Basic Industries SABIC inherited from GE, holds the LEXAN trademark acquired from GE, and its global PC market share is closely tied to Covestro. Backed by Middle Eastern raw material integration, cost control is solid. Features of
SABIC secondary brands: Mid-to-high-end grades flow out, often focusing on melting fingers or appearance indicators, with good substrate strength and flame retardancy foundation. Its sub-brands are suitable for electronic and electrical devices that don't require optical certification but must have some impact and heat resistance. Medical-grade sub-brands must be chosen separately—only sub-plates with clear medical certification batches are used in medical devices; don't just say "they're all pretty similar" and put them on the market. Applicable scenarios: electronic and electrical housings, flame-retardant parts, general structural parts.
Teijin: Panlite, the refined master of optics and medical
Nihon Teijin, signature PC called Panlite, with a leading market share in optical and medical-grade PCs. Its scale is not as large as the previous two, but it has a solid reputation in niche areas like low birefringence and high purity.
Teijin secondary brand characteristics: Batch sizes are small but the material is fine; deviations often focus on hue or fuse fingers, and batches with good optical consistency tend to be common. Used for transparent covers, display parts, and general electronic parts that are not demanding about optics but require whiteness and appearance, making them cost-effective. Applicable scenarios: general transparent parts, display equipment, electronic accessories.
When choosing PC secondary cards, focus on these numbers first
PC whether the main card is used correctly, all depends on the numbers.
First, check how much the light transmittance deviates. For optical components, lenses, lenses, if the transmittance differs by just a fraction, it's fine; just stick to the genuine brand; For ordinary shells and covers, even a percentage point difference is fine. Second, check the internal stress. PC products crack into ice patterns, most likely because the material hasn't been properly baked or annealed. The sub-brand base material itself is fine, but moisture content must be controlled before machine use. Third, check the purpose of certification. For medical items and food contact parts, the sub-brand batch must have corresponding certification endorsements; don't use industrial-grade sub-brands to pass off as medical-grade. Fourth, check packaging traceability. Reputable large factories have large and small sub-brand packaging, and the original bag must match the batch number.
Another pitfall: PC absorbs moisture. If sub-brand materials are not properly stored, the moisture content will increase, causing silver thread bubbles upon loading. Baking the material first upon arrival—this step is indispensable.
Cologne Warehouse In Stock | PC Stock
Main Recommended Brands: Covestro, SABIC, Teijin
Main Brands: Makrolon, LEXAN, Panlite
Packaging Specifications: Both large and small packages are in stock
Warehouse stock usually around 5000 tons; small sub-brand stock is 800-1000 tons, Container sub-brand stock 300-500 tons, large package material/ton packaging stock stock 3500-3900 tons
Supply guarantee: test before signing
That company in Shenzhen that makes medical enclosures and electronic components, calculated the light transmittance account carefully
Shenzhen, Guangdong There is a factory that makes medical equipment enclosures and electronic transparent parts. Last year, they received a batch of orders. The customer wanted transparency to resist drops and also to negotiate prices hard. Using only genuine Makrolon means bottoming out profits; Using generic materials, medical casing customers simply can't handle raw material certification
Later, they opened up the products to check: the exposed transparent windows and certified parts continued to use genuine brands for quality, while the internal casing and uncertified transparent structural parts were cut. They cut a batch of Covestro Makrolon sub-brands and Teijin Panlite sub-brands, specifically selecting batches with slightly deviating light transmittance (invisible to the human eye) but meeting impact resistance and melting resistance standards. Before machine installation, they uniformly dried the material and controlled internal stress; actual light transmittance measured only 0.5 percentage points below the genuine brand.
calculated that non-certified parts saved over 600 yuan per ton of material, reducing overall costs by about 12% for this batch of orders, with a yield stable at 97%. The customer inspected the genuine part and was completely unaffected. This is the correct way to open up PC secondary brands—not to use them for optical or medically certified parts, but to distinguish between 'genuine parts for visible and certified parts, and secondary badges for hidden transparent parts.' Ningbo Kelong New Materials Co., Ltd. has been making imported PC secondary brands for years, and has produced quite a few similar combinations every year. Simply put, it's about helping you distinguish which parts in a product have genuine and which are secondary brands, before mass production.
Eight Mnemonics: How to Choose PC Secondary Brands?
1. For optical parts and medical-certified parts, be honest and practical for genuine brands;
2. Usually transparent casings and non-certified parts are used for secondary plates;
3. First, identify the manufacturer: Covestro, SABIC, Teijin—only when the original factory is sold out can you feel secure;
4. For sub-brands with light transmittance differences of just a fraction, use casing parts freely, but avoid lens parts;
5. Always dry the material before machine use; if moisture content is uncontrollable, silver thread bubbles appear;
6. For medical-grade sub-brands, choose the certified batch; don't use industrial-grade to make the difference;
7. Check the original factory label for packaging; both large and small packages should be traceable;
8. Small batch testing before ramping up, retaining samples to follow batches.
Who hasn't messed up on PCs for electronic casings, medical accessories, or transparent covers?
Is the finished product cracked into ice patterns in the warehouse? Or is the transparent part so yellow it looks like an old photo? Or is it cheap and got a batch of "secondary brands" that are all silver threads when baked on the machine?
