同牌号PCTG副牌透光率常在九成上下浮动一两个点、热变形温度相差不到5℃，分子骨架和正牌没换。
近四成高透明盘子，被一家美国厂攥着
先给你一个数：全球非晶共聚酯这块高透明的盘子，美国伊士曼一家就占了近四成。你手里那个耐摔、可进洗碗机、没有BPA的水杯，材料大概率跟Tritan脱不开关系。
但正牌Tritan贵，贵到很多做透明容器、透明包装的厂，只能拿PET硬顶——PET一遇热水就软，做热饮杯、婴儿餐具根本顶不住。中间这道缝，就是PCTG副牌的位置。这篇讲清楚。
PCTG是什么：把PET的结晶“掐灭”
PCTG，学名聚对苯二甲酸环己烷二甲醇酯，是一种非晶性共聚酯。说人话：它和PET是亲戚，但分子里多加了CHDM（环己烷二甲醇），把结晶给掐灭了，于是变得又透又韧，还耐化学、耐热水、可消毒。高端那一档，伊士曼的Tritan还用了TMCBD（四甲基环丁二醇），耐热更上一层，完全无BPA。
它能干啥？透明水杯、婴儿餐具、食品容器、化妆品包材、透明医疗器械——凡是要“透、韧、耐热、没BPA”的地方，都有它。
全球做这东西的，国外就三家扛大梁：美国伊士曼（Eastman）的Tritan™和Eastar™是龙头，中国区份额近四成；韩国SK化学的SKYGREEN®和ECOZEN™排第二，两成出头；意大利的Selenis（M&G继承体系）做Selekt™系列跟在后面。国产材料还在追。我们按梯队讲。
副牌通识：盯住透光、黄度、IV值这三项
PCTG副牌，还是那套逻辑。同一厂家同一牌号聚合，出厂检验透光率、色相、或者粘度某一项没完全踩线，就是副牌。来路四条：开停车头尾料、换牌号过渡料、工艺波动批次、副线尾料。
它还是原厂原生粒子，非晶结构跟正牌一致，只是某项指标小幅飘。和回收PCTG不是一回事——回收料经过一次热历史，粘度掉、黄度升，做透明件直接发雾发黄。边界表照旧：
| 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 | 高要求件、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 | 一般件、配色件、内件 |
| 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 |
PCTG副牌盯三件事：透光率、黄度指数、粘度（IV值）。这三项决定你吹出来的容器透不透、黄不黄、壁厚匀不匀。
伊士曼Eastman：Tritan就是它家的
第一家，美国伊士曼（Eastman）。PCTG高端的代名词就是它家Tritan™，TX1001、TX1800、EX401、EX501这些牌号，做母婴餐具、运动水杯的厂闭着眼都认识。Eastar™则是性价比通用级。
伊士曼的强项是无BPA认证全、耐热高、耐洗碗机反复消毒。副牌料过来，一般是透光率或黄度小幅飘，但分子骨架是原厂的。做对透明要求没到母婴级的普通透明容器、日用品，伊士曼副牌是稳妥选择。
SK化学：性价比和生物基那一档
第二家，韩国SK化学（SK Chemicals）。它家的SKYGREEN®是老牌透明共聚酯，ECOZEN™则是加了生物基、可耐100℃沸水、可进洗碗机的新一代。做厨房小电器、水杯、保鲜盒的厂用得多。
SK化学的优势是性价比和生物基概念，批次稳定。副牌料适合做对耐热要求中等的透明包装、化妆品容器。挑它的副牌，重点看透光和耐热是不是对得上你的消毒工艺。
Selenis：通用片材包装的性价比之选
第三家，意大利Selenis。这家是原来M&G共聚酯体系的继承者，做Selekt™系列非晶共聚酯，在包装和片材方向有一席之地。
它的特点是通用级性价比，做热成型片、透明包装容器很对路。副牌料适合做不直接接触高温的透明包装、展示盒。选它副牌，粘度和成型窗口要试好。
避坑：母婴热饮件别省，普通件副牌够用
PCTG副牌怎么挑？第一，先认用途等级。母婴、热饮、可消毒的，别省那点钱；普通常温透明件，副牌够用。
第二，盯透光率和黄度。透明件发雾发黄，客户一眼就看出来。第三，测IV值。粘度不对，吹瓶壁厚不均，注塑充模也出问题。
第四，认厂。伊士曼、SK化学、Selenis这三家的副牌是原厂料，别碰来路不清的“共聚酯平替”。第五，包装只问大包装、小包装。大包装上量产吹瓶注塑，小包装打样。
科隆仓库现货｜PCTG囤货
主推品牌：伊士曼、SK化学、Selenis
主要牌号：Tritan/Eastar系列、SKYGREEN/ECOZEN系列、Selekt系列
包装规格：大包装/小包装均有备货
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
选型口诀 + 一个西安透明容器厂的案子
口诀：
1. 要无BPA、耐热、可消毒——伊士曼Tritan；
2. 要性价比、生物基——SK化学SKYGREEN/Ecozen；
3. 要通用透明片材包装——Selenis；
4. 进厂先测透光率、黄度、IV值；
5. 母婴热饮件——用正标，别省；
6. 普通透明容器——副牌够用；
7. 量产选大包装，打样选小包装。
西安有家做透明食品容器的客户，之前为了压成本，透明保鲜盒拿普通PET硬顶，结果微波一加热就变形收缩，退货率到了9%。后来换成伊士曼同牌号副牌，透光率和黄度进厂先测后签，微波不变形、透明度一次做干净，退货率降到0.4%，良率回到九成六。
材料一吨贵了千把块，一年售后省下来的钱翻了好几番。这就是选型的价值——透明耐热这关，省错地方就是在赔售后。宁波市科隆新材料有限公司常年做进口大厂副牌，包装、透明容器方向的案子经手不少，说白了就是帮你把“透不透、热不变不变”这件事，量产之前试到位。
资料与数据来源
· PW Consulting《Worldwide Amorphous Copolyester Material Market 2026》
· 豆丁网《2026年中国非结晶型共聚酯材料报告》《2026年中国共聚酯PETG和PCTG行业报告》
· Eastman Tritan™资料；SK Chemicals SKYGREEN/ECOZEN资料；Selenis Selekt™资料
·
The light transmittance of the same grade PCTG sub-brand often fluctuates by one or two points around 90%, the heat distortion temperature differs by less than 5°C, and the molecular framework and genuine plate are not replaced.
Nearly 40% of highly transparent plates are held by a US factory
Here's a figure: For the global amorphous copolyester plate, Eastman alone accounts for nearly 40%. The drop-resistant, dishwasher-safe, BPA-free water cup you have is most likely related to Tritan.
But the genuine Tritan is expensive—so much so that many factories making transparent containers and packaging can only use PET hard as a hard shell—PET softens when exposed to hot water, but can't withstand hot drink cups or baby utensils at all. The gap in between is where the PCTG secondary brand is located. This article explains it clearly. What is
PCTG:
PCTG it "stifles" PET crystals , scientifically named polyterephthalate cyclohexanedimethanol, an amorphous copolyester. To put it plainly: it is related to PET, but it contains CHDM (cyclohexanedimethanol) in its molecules, which kills the crystals, making it translucent and tough, chemical-resistant, water-resistant, and disinfectable. At the high-end level, Eastman's Tritan uses TMCBD (tetramethylcyclobutylene glycol), which is heat-resistant and completely BPA-free.
What can it do? Transparent water cups, baby utensils, food containers, cosmetic packaging, transparent medical devices—wherever you want to be "transparent, tough, heat-resistant, and BPA-free," you can find it.
Globally, only three companies are leading this industry: Tritan™ and Eastar™ from Eastman in the US are the leaders, with nearly 40% market share in China; SK Chem's SKYGREEN® and ECOZEN™ from Korea are second, just over 20%; Selenis (M&G succession system) from Italy follows with the Selekt™ series. Domestic materials are still catching up. Let's talk by tier.
Secondary Card Knowledge: Focus on light transmission, yellowness, and IV value
PCTG secondary cards, still following the same logic. If the same manufacturer and grade are polymerized, and any item in the factory inspection for light transmittance, hue, or viscosity doesn't fully meet the line, it's a secondary brand. There are four main sources: starting and stopping the starting and tail materials, switching grades as transition materials, process fluctuation batches, and secondary line scraps.
It's still original factory native particles, with an amorphous structure identical to the genuine brand, except that some indicators have slightly fluctuated. It's not the same as recycling PCTG—after a thermal cycle, the recycled material loses viscosity and increases yellow, and when made into transparent parts, it becomes foggy and yellow. Boundary table remains as before:
| Type | Source | Quality | Typical Use |
|---|
| Genuine Brand | Original Factory Standard Batch | Full Indicator Compliant, Batch Stable | High Requirements, Certified Parts |
| Subbrand | Original factory substandard batch | slight deviations in certain indicators, substrate consistent with genuine brand | General parts, color-matched parts, internal parts |
| Reused/sprue material | Processed scraps repelled and granulated | Already experienced once heat history | Low requirements products |
| Regenerated material | Recycled plastic pelletizing | Large performance fluctuations | Low-end products, fillers |
PCTG and sub-brands focus on three things: light transmittance, yellowness index, and viscosity (IV value). These three factors determine whether the container you blow through completely, whether it is yellow, and whether the wall thickness is uniform.
Eastman: Tritan is their first brand from
, Eastman USA. PCTG's high-end brand is their Tritan™. Brands like TX1001, TX1800, EX401, EX501—brands like mother and baby tableware and sports cups are all familiar to any factory. Eastar™ is a cost-effective general-purpose product.
Eastman's strengths are BPA-free certification, high heat resistance, and dishwasher durability. When using secondary brands, the light transmittance or yellowness usually fluctuates slightly, but the molecular framework is original. For ordinary transparent containers and daily necessities that aren't required for transparency at the level of mother and baby, Eastman's secondary brand is a safe choice.
SK Chemicals: The second in the cost-performance and bio-based category
is SK Chemicals from Korea. Their SKYGREEN® is a traditional transparent copolyester, while ECOZEN™ is a new generation with bio-based additives, 100°C boiling water resistance, and dishwasher safety. It's widely used by factories for small kitchen appliances, water cups, and food storage containers.
SK Chemical's advantages are cost-effectiveness and bio-based concept, with stable batch production. The secondary brand material is suitable for transparent packaging and cosmetic containers with moderate heat resistance requirements. When choosing their secondary brand, focus on whether the light transmission and heat resistance match your disinfection process.
Selenis: The cost-effective choice for general-purpose sheet packaging
Third company, Italian Selenis. This company is the successor of the original M&G copolyester system, producing the Selekt™ series of amorphous copolyesters, and has a place in packaging and sheet materials.
Its feature is general-grade cost-effectiveness, making it very suitable for hot-formed sheets and transparent packaging containers. Secondary brand materials are suitable for transparent packaging and display boxes that do not directly contact high temperatures. When choosing secondary brands, test viscosity and forming windows well.
Pitfall: Don't skip on hot maternal and baby drinks; ordinary secondary brands are sufficient
PCTG How to choose secondary brands? First, identify the grade of use. For mothers and babies, hot drinks, and disinfectants, don't skimp on that little money; For regular temperature transparent parts, the secondary brand is sufficient.
Second, monitor light transmittance and yellowness. Customers can spot misty or yellow parts at a glance. Third, measure the IV value. If viscosity is incorrect, the blow mold wall thickness is uneven, and injection molding may also have issues.
Fourth, identify the manufacturer. Eastman, SK Chemical, and Selenis have sub-brands that are original factory materials; avoid unfamiliar "copolyester alternatives." Fifth, only ask about large and small packaging packaging. Large packaging is used for mass production blow molding injection molding, small packaging is sampled.
Cologne warehouse in stock | PCTG stocking
Main recommended brands: Eastman, SK Chemical, Selenis
Main grades: Tritan/Eastar series, SKYGREEN/ECOZEN series, Selekt series
Packaging specifications: both large and small packages are stocked
warehouse stock usually around 5000 tons
small sub-brand stock 800-1000 tons, sub-brand containerized 300-500 tons, large packages/ton packaging stock 3500-3900 tons
Supply Assurance: Test before signing
Selection Formula A case for a Xi'an transparent container factory
Tip:
1. BPA-free, heat-resistant, disinfectable — Eastman Tritan;
2. Cost-effective and bio-based — SK Chemical SKYGREEN/Ecozen;
3. Universal transparent sheet packaging — Selenis;
4. Measure light transmittance, yellowness, and IV value before entering the factory;
5. Mother and baby hot beverage parts — use the official standard, don't save money;
6. Ordinary transparent containers — secondary brands are sufficient;
7. For mass production, choose large packaging; for samples, choose small packaging.
Xi'an's client who makes transparent food containers. Previously, to cut costs, they used regular PET hardtop transparent containers, but as soon as they were microwaved, they deformed and shrank, resulting in a return rate of 9%. Later, they switched to Eastman sub-brands of the same grade. Light transmittance and yellowness were tested before signing upon arrival. Microwave deformation and transparency were done in one go, with return rates dropping to 0.4% and yield rates returning to 96%.
Materials cost over a thousand yuan per ton, but the money saved after a year of after-sales service multiplied several times. This is the value of product selection—transparent heat resistance, and the mistake is losing after-sales compensation. Ningbo Kelong New Materials Co., Ltd. has long been a sub-brand supplier for major imported manufacturers, handling many cases related to packaging and transparent containers. Simply put, it's about helping you get the issue of 'permeability and heat stability' in place before mass production.
Information and Data Source
· PW Consulting 'Worldwide Amorphous Copolyester Material Market 2026'
· Douding.com '2026 China Amorphous Copolyester Material Report' and '2026 China Copolyester PETG and PCTG Industry Report'
· Eastman Tritan™ data; SK Chemicals SKYGREEN/ECOZEN data; Selenis Sellekt™ data
·
