先算一笔账。
一吨PBSA，正牌报价比副牌高出小几百到八百。吹降解地膜的厂子，一柜料就是二十来吨，省下来大几万，老板看了高兴。可地膜这东西是铺到地里的，铺完才两个月就脆成碎片，农作物苗刚冒头，膜先没了，回头农户索赔、农业部门抽检不合格，一棚赔进去的钱，够你买三吨正牌料。
这笔账，小学生都会算，可每年开春下订单的时候，总有人把它忘了。问题不在PBSA贵不贵，在你搞没搞懂副牌跟正牌之间，到底差的是哪几个数。今天把PBSA讲透。
PBSA比PBS软在哪，凭什么下地
PBSA，丁二酸-丁二醇-己二酸共聚酯。说白了，就是在PBS的分子链上，硬塞进了一截己二酸。这一截一加，材料立马变软、变韧，断裂伸长率能冲到百分之五百以上，模量比纯PBS低一大截。
软有软的好处。它特别适合吹膜——地膜、包装袋、湿巾层压膜，膜泡拉得开、韧性够、折起来不裂。但软也有软的代价：耐热比PBS差，挺括度不够，做厚壁件就显软塌。所以你品，PBSA天生就是奔着薄膜去的。
这里要把它跟PBS的关系说透。PBS是纯脂肪族，硬一点、熔点高一点；PBSA往里加了己二酸，等于在分子链上插了一段更柔顺的结构，结晶度降下来，材料立马变软变韧。你可以理解成：同样的底座，PBSA多穿了一件弹性外套。正因为这个差别，纯PBS适合注塑做硬件，PBSA适合吹膜做软袋，用反了就是另一笔翻车账。
全球做PBSA的国外大厂，跟PBS高度重叠，但又有自己的侧重。按海外产能和市场份额排，第一梯队还是那几张熟面孔：日本Resonac（原昭和电工）、韩国IRE Chemical，以及三菱化学技术体系的PTT MCC Biochem。PBSA是个细分池子，国内玩家不少，但我们今天只说非大陆阵营。
副牌这概念，别跟回料搅成一锅
讲大厂之前，先把副牌说死。
副牌，是同一厂家同一牌号里，出厂检验没完全踩到正牌指标的那部分。同一批缩聚料，全项合格贴正牌，某一两个指标差一点归副牌。它是原厂原生粒子，分子结构跟正牌一条线，不是粉碎再造。
四个来源：开停车头尾料、牌号切换过渡料、工艺波动个别指标小幅超标的批次、副线尾料。边界再划一遍：正牌全达标；副牌个别指标小偏、基材没换；回料是加工边角料回炉，多一道热历史；再生料是废塑料再造，性能飘忽。四类料，别混。
Resonac的Bionolle 3001，地膜圈的老熟人
日本Resonac（原昭和电工）的Bionolle，是PBSA里响当当的招牌，尤其3001这一系列膜级料，拉伸和断裂伸长率都是标杆水平，抗拉强度二十多兆帕、断裂伸长率五百多，吹起地膜来膜泡稳得很。
它家副牌的特点是过渡料切得干净，常见偏离项集中在熔点和熔指，粒子本身分子量分布跟正牌差得不多。用在对厚度均匀要求不那么极限的农用地膜、园艺膜上，副牌完全够格。大包装小包装都在流通。
IRE Chemical的Enpol，韩国人的灵活牌
第二家韩国IRE Chemical，牌子Enpol，在群山做PBSA，膜级和注塑级都有。它家PBSA的市场存在感不算小，海外份额常年排在前面。
Enpol副牌的特点是批次差异略大，熔指和伸长率偶尔会跳出正牌区间。这种料不适合一上来就冲高端透明膜，但拿来跟其他降解料掺混、做一般农业覆盖膜、做包装内衬，性价比很高。价格也比Resonac温柔一档。
PTT MCC Biochem的BioPBS家族，技术底子在
第三家泰国PTT MCC Biochem，三菱化学技术体系，BioPBS。它在PBSA这条线上走的是"生物基可堆肥"路子，膜级料也有布局。
它家副牌常偏离在生物基含量测算、色相这一栏。正因为认证线卡得严，副牌往往不是性能塌，而是"差一点点没盖章"。拿去做不需要贴认证标的普通降解膜、工业包装膜，非常实在。
数字不会骗人，副牌先测这两项
PBSA副牌挑货，别光盯价格，盯两个数。
第一个是断裂伸长率。PBSA靠韧性吃饭，伸长率掉一截，地膜铺地里就先脆。第二个是熔点。熔点偏低，吹膜温度就得往下压，不然膜泡塌、断头多。同牌号PBSA副牌，断裂伸长率通常落在百分之五百上下浮动几十个百分点，熔点比正牌低个两度，吹膜起霜和断头率的差别，全看这两组数你有没有先测。
还有第三条，别把PBSA跟PBS、PBAT混着买。这仨名字像，料性差一截。PBS偏硬适合注塑，PBSA偏软适合吹膜，PBAT又是另一条路。副牌料包装袋上那串牌号、那串组分，收货时第一件事就是对着化验单核一遍，别图省事。
举个例子。山东威海有家做降解农用地膜的客户，之前图便宜进了一柜没测数的副牌，铺下去两个月脆成碎片，赔了农户一棚。后来改成先测伸长率和熔点，小样吹一卷，数据对上再放量，脆化时间从两个月拉到四个月以上，再没出过索赔。这就是算账——省下来的料钱，不能建立在赌指标上。宁波市科隆新材料有限公司做进口降解膜副牌这些年，帮客户把这两组数卡清楚，是常规动作。
科隆仓库现货｜PBSA全检
主推品牌：Resonac原昭和电工（Bionolle）、韩国IRE Chemical（Enpol）、泰国PTT MCC Biochem（BioPBS）。
主要牌号：Bionolle 3001、Enpol、BioPBS。
包装规格：大包装、小包装都有，小包装试机打样，大包装、吨包料量产摊薄。
仓库现货：PBSA副牌仓库现货通常在4000吨上下，常年备货不断档。
其中小包副牌备货600-900吨、箱装副牌备货250-450吨、大包料/吨包料备货2650-3150吨，按订单配比灵活出。
供应保障：检测单随货走，每批指标可核。
收尾：四句选料口诀
PBSA副牌，记住四句：
一，伸长率、熔点先测，别把价格当成全部标准；
二，吹高端认证膜上正牌，做普通覆盖膜、掺混料用副牌；
三，小样先吹一卷，脆化时间拉得够长再放量；
四，原厂原生粒子，不把回料再生料当副牌捡。
做降解地膜、做包装膜的，谁没赔过？是铺下去两个月就碎？还是吹膜吹到一半断头满天飞？又或是省了几百块料钱，赔了一棚农户？
Let's do the math first.
One ton of PBSA costs a few hundred to eight hundred yuan more than the secondary brand. Factories that blow degradable plastic film can use about twenty tons per container, saving tens of thousands, which makes the boss happy. But plastic film is laid in the ground; after just two months, it breaks into fragments. When crop seedlings just sprout, the film disappears first, farmers demand compensation, agricultural departments fail inspections, and the money paid per greenhouse is enough to buy three tons of genuine feedstock.
Even elementary school students can calculate this, but every spring when ordering, someone always forgets it. The issue isn't whether PBSA is expensive, but whether you understand what is the difference between secondary and genuine brands. Today, I'll explain PBSA thoroughly.
PBSA is softer than PBS? Why put it in the
PBSA of succinic acid–butanediol–adipic acid copolyester. Simply put, it's like forcing a segment of adipic acid into the PBS molecular chain. This extra cut immediately softens and toughens the material, with a break elongation rate of over 500%, and its modulus is much lower than pure PBS.
Soft has its advantages. It's especially suitable for film blowing—mulch, packaging bags, wet wipe lamination. The film bubbles can be stretched open, tough, and won't crack when folded. But softness comes with its trade-offs: heat resistance is worse than PBS, not crisp enough, and thick-walled parts look soft and saggy. So you see, PBSA was born to be a thin film.
Here, we need to explain its relationship with PBS. PBS is pure aliphatic, harder and has a higher melting point; PBSA adds adipic acid, which means a smoother structure is inserted into the molecular chain, lowering crystallinity and instantly softening and toughening the material. You can think of it as: with the same base, PBSA wears an extra elastic jacket. Because of this difference, pure PBS is suitable for injection molding hardware, PBSA is better for blown film for soft bags, and if used backwards, it can be another backlash.
The major foreign companies making PBSA worldwide overlap heavily with PBS, but each has its own focus. Ranked by overseas production capacity and market share, the first tier is still the same few familiar faces: Japan's Resonac (formerly Showa Denko), South Korea's IRE Chemical, and Mitsubishi Chemical's PTT MCC Biochem. PBSA is a niche pool with many domestic players, but today we're only talking about the non-mainland camp.
The concept of secondary brands shouldn't be mixed with recycled materials .
Before talking about big companies, let's make the secondary brand a secret.
The secondary brand is the part of the same manufacturer and grade that didn't fully meet the official brand standards during factory inspection. If the same batch of polycondensate material passes all items and is labeled as genuine, if one or two indicators fall short, it's considered a secondary brand. These are original factory virgin particles, with molecular structure aligned with genuine brands, not crushed or reprocessed.
Four sources: start-and-stop starting and tail materials, grade switching transition materials, batch with slight exceedances due to process fluctuations, and secondary line scraps. Draw the boundaries again: genuine brands all meet standards; Secondary brands have minor deviations in some indicators, no substrate replacement; Reprocessed materials are processed scraps and remelted, adding an extra heat cycle; Recycled materials are recycled from waste plastic, with unstable performance. Four types of materials, don't mix them.
Resonac's Bionolle 3001, a familiar face in the mulch film industry
Japan's Resonac (formerly Showa Denko) Bionolle, is a well-known brand in PBSA. Especially the 3001 series of film-grade materials, which have benchmark tensile and elongation at break, tensile strength over 20 MPa, and elongation at break over 500, making the film bubble very stable when blown up.
's sub-brand features clean cutting of transition materials, with common deviations concentrated in melting point and melting index, and the molecular weight distribution of particles is not much different from the genuine brand. Used for agricultural and horticultural films that require uniform thickness, the sub-brand is fully qualified. Both large and small packages circulate in circulation.
IRE Chemical's Enpol, a flexible brand from Korea
The second Korean IRE Chemical brand is Enpol, making PBSA in Gunsan, covering both film and injection grade products. Their PBSA has a considerable market presence, with a long-standing overseas market share among the top.
Enpol secondary brand is characterized by slightly larger batch differences, with melting fingers and elongation rates occasionally exceeding the official brand's range. This material is not suitable for immediate high-end transparent film, but it is very cost-effective for mixing with other degradable materials, making general agricultural cover films, or packaging linings. Its price is also a notch gentler than Resonac.
PTT MCC Biochem's BioPBS family has technical foundations in
Thailand's PTT MCC Biochem, Mitsubishi Chemical Technology System, BioPBS. They follow the "bio-based compostable" approach in the PBSA line and also have a presence in film-grade materials.
's sub-brand often deviates from the bio-based content calculation and hue sections. Because the certification line is strict, sub-brands often don't suffer from poor performance but "just a little bit missing stamps." Using them to make ordinary biodegradable films or industrial packaging films that don't require certification marks is very practical.
Numbers don't lie; sub-brands test these two first
PBSA selecting sub-brands, don't just focus on price, focus on two numbers.
The first is elongation at break. PBSA relies on toughness; if its elongation drops a bit, the mulch film will become brittle when laid on the ground. The second is the melting point. If the melting point is low, the film blowing temperature must be lowered; otherwise, the film bubbles collapse and there are more fractures. For PBSA secondary brands of the same grade, the elongation at break usually fluctuates around 500%, fluctuating by several dozen percentage points, and the melting point is two degrees lower than the genuine brand. The difference in frosting and broken rate during film blowing depends entirely on whether you tested these two numbers first.
Another rule: don't mix PBSA with PBS or PBAT. These three have similar names but differ in material properties. PBS is harder and better for injection molding, PBSA is softer for film blowing, and PBAT is a different path. The label and component on the sub-brand material packaging bag are first tested and verified by the test sheet—don't try to save time.
For example. In Weihai, Shandong, a client who made degradable agricultural mulch film bought a cabinet of untested sub-brands for a cheap price, and after two months, they broke into fragments, costing the farmer an entire greenhouse. Later, they switched to first testing elongation and melting point, then blowing up the sample, matching the data, then ramping up, and the brittle time was extended from two months to over four months, with no further claims. That's the accounting — the saved material money can't be based on betting on targets. Ningbo Kelong New Materials Co., Ltd. has been doing the import degradable film sub-brand for years, helping clients clearly count these two sets of numbers, which is routine.
Cologne warehouse in stock | PBSA full inspection
Main brands: Resonac (formerly Showa Electric (Bionolle), Korea IRE Chemical (Enpol), Thailand PTT MCC Biochem (BioPBS).
Main grades: Bionolle 3001, Enpol, BioPBS.
Packaging specifications: Both large and small packages, small packaging trial machine samples, large packaging and ton-weight mass production and thinning.
Warehouse in-stock: PBSA sub-brand warehouses usually have stock around 4000 tons, with constant stock year-round.
Among them, small parcel sub-brand stock is 600-900 tons, containerized sub-brand stock is 250-450 tons, and large package/ton package material stock is 2650-3150 tons, flexibly distributed according to order ratio.
Supply Guarantee: Test orders are sent with the goods, and each batch can be verified as indicators.
Conclusion: Four material selection tips
PBSA sub-brand, remember these four points:
First, measure elongation and melting point first; don't treat price as the sole standard;
Second, promote high-end certified films as genuine brands, and use sub-brands for ordinary cover films and blended materials;
Third, blow a roll of the sample first, then increase volume after the brittleness time is extended enough;
Fourth, original factory original particles, don't treat recycled materials as a secondary brand.
Who hasn't lost money in making degradable mulch film or packaging film? Did it break after two months of laying? Or did it break off halfway through the film blowing and scatter everywhere? Or did you save a few hundred yuan on material and lose a whole farmer's shack?
