老吴在慈溪做汽车门锁件，一批PBT/PET共混料因为新配方把PET比例调了，仓库里剩了六吨多旧配比的原包料。袋身上的标签还是两年前印的，他对着配方单发愣——旧配比的料，新机根本用不上，可扔了又心疼，那可是花了真金白银买回来的。仓管问他要不要处理掉，老吴摆摆手："处理？你知道这料外面怎么收吗？"
PBT/PET这种共混料，呆滞起来连自己人都分不清。
料换了配比，旧料就成了"知道是啥却用不上啥"的尴尬。
PBT/PET为什么难处理？它把PBT的成型快和PET的耐油污拼在一起，专门给门锁、电子件这种既要快又要耐油的地方用。可PBT和PET本来就是"近亲"，长得像、密度像、烧起来味道也像，普通回收商拿在手里根本分不清你这袋是纯PBT、纯PET还是共混料。这就像两杯长得差不多的茶，一杯绿茶一杯乌龙，外行一口喝不出区别。一旦混了堆，价值直接腰斩。再加上单价不低、用量又没纯PBT大，二手市场接得住的人不多，压在仓里光资金占用就够你受的。
共混料就怕的不是放，是被当成另一种料贱卖。
再算时间账：这种共混料放久了，PET那部分容易水解，分子量往下掉，料跟着变脆。你自己上机试两模就知道，跑出来的件一掰就断。这时候再卖，人家测一测物性，压价压得你没脾气。
再说收废料的。你打一圈电话，对方一听PBT/PET，先装懂，"这个我们常收"，报完价你一听就知道他压根没分清。统货商的套路你闭着眼都能背：先把你说慌，"这料放这么久，PET都降解了"，然后按统货价收，转手卖给改性厂翻一倍。有些更阴，上门看货的时候偷偷拿点样去测，测完回来压你价："你这料PET比例不对，只能当普通PBT收。"说白了，他不是来收货的，是来拿你的料练手的，练完手还得你掏钱。
跟分不清茶和咖啡的人谈茶价，你注定亏。
科隆新材做终端消化型回收，PBT/PET这种共混料我们接得动。我们手上长期有做门锁、电子、耐水解结构件的客户在用这类料，热门批次收进来当天就能走，不压库。遇到偏门配比、混批或者存放较久的，我们拉回厂按物性测试分级，进自家改性配方按比例消化，不挑牌号、不挑批次。定价按实测耐水解、耐油性能和外观分级，明码实价，不是统货一刀。自有产能和固定客户托底，报价稳，不随行情大起大落。
共混料的价，得靠真测出来，不是靠嘴估出来。
合作流程五步：报料、分级评估、上门收货、抵扣货款、结算开票。你把料袋印字、数量、外观、用途拍过来，我们按实物定级报价，谈拢就上门拉货。回收款能直接抵你后续采购新料的货款——工程塑料这块我们自有KONICE改性塑料系列。慈溪老吴那六吨多旧配比料，评估完折了个实在价，直接抵了他下半年KONICE改性料差不多一半的货款，标签发黄那几袋也没被另眼相看。
把用不上的配比，变成用得上的新料额度。
可回收的PBT/PET牌号我们接得不少。巴斯夫Ultradur系列里的PBT/PET共混料、SABIC Valox ENH8530这类耐水解耐油的主流牌号，是我们的常规收货对象；其他厂牌、其他配比的PBT/PET，也欢迎报料，以实物评估为准。可回收形态包括呆滞原包料（整托散包都行）、水口料和浇口料、门锁件边角料和机头料、电子件废品与不良品，以及项目收尾的库存尾料，标识清楚、成分单一都能谈。
避坑三条。"PBT和PET长得一样，混着卖呗？"真相是混了就被当统货压价。"放着慢慢用？"真相是吸湿降解不可逆，越放越软。"谁价高卖给谁？"真相是不懂配比的贩子，到手必砍。
合规这块：正规回收处置，过磅单、回收单齐全，流向可查，能配合过环保审计和ISO审核，绝不流向非法小作坊。
Old Wu makes car door locks in Cixi. A batch of PBT/PET blend, because the new formula adjusted the PET ratio, left over six tons of original raw material with the old mix in the warehouse. The label on the bag was still printed two years ago. He was stunned by the single formula—old mix material is useless for the new machine, but throwing it away makes it painful, since it was bought with real money. The warehouse manager asked if he wanted to dispose of it, but Old Wu waved his hand: "Process?" Do you know how this material is collected outside? "
PBT/PET blends are so dull that even people can't tell them apart.
changed the material ratio, and the old material became the awkward situation of "knowing what it is but not using it." Why is
PBT/PET hard to handle? It combines the molding speed of PBT with PET's oil resistance, specifically for places like door locks and electronic parts that need both speed and oil resistance. But PBT and PET are "close relatives"—they look similar, have the same density, and taste similar when burned. Ordinary recyclers can't even tell if your bag is pure PBT, pure PET, or blended. It's like two cups of tea that look similar—one green tea and one oolong—outsiders can't tell the difference in one sip. Once mixed together, the value is cut in half. Plus, the unit price isn't low, and the quantity isn't as high as pure PBT, so few people in the second-hand market can handle it. Just the capital tied up in the warehouse is enough to take the risk.
The real fear isn't about storing it, but being sold cheaply as another material.
Let's calculate the timeline: If this blend is stored for a long time, the PET part hydrolyzes easily, molecular weight drops, and the material becomes brittle. You can test the mold on the machine and you'll see that the parts that come out break easily. Then sell again, and they test the physical properties and lower the price to make you lose your temper.
Now let's talk about the waste collectors. You make a round call, and when the other party hears PBT/PET, they pretend they understand, "We buy this often," but after quoting the price, you know they didn't even know the difference. You can memorize the wholesaler's tricks with your eyes closed: first, they fool you, "This material has been stored for so long, the PET has degraded," then buy at the wholesale price and sell it to modification factories for double price. Some are even more sneaky: when you come to inspect goods, they secretly take samples for testing, then come back and bargain your price: "Your PET ratio is wrong, so you can only buy it as regular PBT." "To put it bluntly, they're not here to buy goods, they're here to practice with your material, and after you practice, you have to pay."
If you negotiate tea prices with people who can't tell tea from coffee, you're destined to lose money.
Kelong New Materials does end-use digestion recycling; we can handle PBT/PET blends. We have customers who have long made door locks, electronics, and hydrolysis-resistant structural parts using these materials. Popular batches can be bought the same day without inventory pressure. If we encounter off-mix ratios, mixed batches, or long-term storage, we bring them back to the factory for physical property testing and grading, then convert them into our own modified formulas according to proportion, without picking on grade or batch. Pricing is based on actual measured hydrolysis resistance, oil resistance, and appearance grading, with clear pricing—not a one-off price cut. With our own production capacity and fixed customers as a backup, our quotes are stable and don't fluctuate wildly with market trends.
The price of mixed materials must be measured honestly, not estimated by words.
Five-step cooperation process: material reporting, grading and evaluation, on-site pickup, deducting payment, settlement and invoice issuance. You place a bid for the material bag printing, quantity, appearance, and purpose, then we grade and quote based on the actual item. Once we reach an agreement, we come to the door to deliver the goods. The recovered payment can be directly used to offset your subsequent purchase of new materials—for engineering plastics, we have our own KONICE modified plastics series. Cixi Lao Wu's more than six tons of old-mix material were appraised and discounted to a real price, directly offsetting about half of his second half of the payment for KONICE's modified material in the second half of the year. The few bags with yellowed labels weren't given any special attention.
Turning unused mix ratios into usable new material quotas.
We have received quite a few recyclable PBT/PET grades. The PBT/PET blends in BASF's Ultradur series, SABIC Valox, ENH8530 mainstream hydrolysis and oil-resistant grades are our regular buyers; Other brands and other PBT/PET formulations are also welcome to submit materials, subject to physical appraisal. Recyclable forms include obsolete original packaging (whole pallets and bulk packages are fine), sprue and gate materials, door lock scraps and machine head scraps, electronic scrap and defective products, and inventory scraps at the end of projects. All are negotiable with clear labels and single compositions.
Three pitfalls to avoid. "PBT and PET look the same, why not mix them and sell them together?" The truth is, once mixed together, they get mistreated as regular goods and undervalued. "Leave them and use them slowly?" The truth is moisture absorption and degradation are irreversible, and the more you store them, the softer they get. "Who sells at the highest price?" The truth is, dealers who don't understand proportions will cut them off once they get them.
Compliance: Proper recycling and disposal, complete weighing and recycling forms, traceable flow, can cooperate with environmental audits and ISO audits, and absolutely won't end up in illegal small workshops.
