PET多少钱一公斤？成本算账，瓶片和工程料是两个世界
PET多少钱一公斤？
这个问题一搜，从七块一公斤到三十五块一公斤，报价差得比粘度还多。有人说我买的七块五的三房巷CZ-318用得挺好，有人说我买的三十二块的杜邦Rynite才叫工程塑料。到底差在哪？
说实话，问PET多少钱一公斤的人，大概率还没搞懂PET这东西不是一个料——瓶级、纤维级、膜级、工程级（玻纤增强），每个分支价格都不一样。你拿瓶级的价和工程级比，那不叫比价，叫被忽悠。
一、主流牌号报价（外企+中企）
先把市面上走量的牌号和参考价摆出来。以下为近期市场参考价，实时价格以当日询价为准。
杜邦（DuPont）
Rynite RE5264E，30%玻纤增强，参考价约32元/公斤。工程级，高强度、耐高温，电子电器、汽车部件。
Rynite SST35，35%玻纤增强，参考价约32元/公斤。超韧级，汽车结构件。
远纺（Far Eastern）
CH-610，瓶级食品级，参考价约10-11元/公斤。注拉吹瓶料，高透明，喷雾瓶、饮料瓶。
三房巷（中企大厂）
CZ-318，水瓶级，参考价约7-8元/公斤。国产主力，性价比高，矿泉水瓶、油瓶。
CZ-328，瓶级，参考价约7-8元/公斤。中粘度，通用瓶制品。
华润化学（中企大厂）
CR-8863，吹塑高透明食品级，参考价约7-8元/公斤。油瓶、食品包装。
CR-8816，瓶级，参考价约7-8元/公斤。通用瓶制品。
万凯新材（中企大厂）
WK-821，水瓶级，参考价约7-8元/公斤。性价比高，饮料瓶、包装。
一句话总结：瓶级7-11块，纤维级6-8块，膜级8-12块，工程级玻纤增强20-35块。你要的是啥用途，决定了你该在哪一档选。
二、同是PET，价差凭什么这么大
PET的价格差，主要藏在四个地方。
第一，用途等级不同。瓶级、纤维级便宜，膜级贵一点，工程级（玻纤增强）最贵。工程级PET是加了玻纤的，和瓶级完全不是一个东西。
第二，粘度不同。瓶级分高粘、中粘、低粘，粘度越高价格越贵。粘度决定了加工方式和制品强度。
第三，功能改性不同。玻纤增强、阻燃、抗UV、食品级——这些都要加钱。工程级PET加了30%玻纤，价格直接翻三倍。
第四，品牌和产地。进口溢价高但批次稳定，国产性价比高但质量参差。同样是瓶级，远纺比三房巷贵30%，贵的是品控和研发。
三、采购避坑：别让粘度骗了你
我见过太多采购，比价比到最后选了最便宜的七块的，然后做出来的瓶子强度不够、乙醛超标、客户退货，一次损失够买半年的好料。
PET采购这行，水比你想的深。三个坑必须绕开：
第一，看特性粘度不看牌号。同一个牌号不同批次粘度可能波动，拿到料先测IV，和COA对得上再用。别听销售说"差不多"，差不多就是差很多。
第二，警惕以次充好。有些贸易商拿纤维级当瓶级卖，拿瓶级当工程级卖。要COA、要物性报告、要原厂包装，三证合一才敢用。
第三，别只比单价，算综合成本。A料单价7块，做出来次品率5%；B料单价10块，次品率1%。算到每件制品上，B料反而更便宜。
四、标准牌号满足不了？看看改性方案
如果你发现标准牌号怎么选都差点意思——比如要阻燃又要高流动、要增强又要增韧、要食品级又要低成本——那不是PET的问题，是你需要的不是标准PET，是改性PET。
这时候可以看看宁波科隆新材目前在做的高性能改性PET方案，玻纤增强、阻燃、增韧、抗UV这些方向都有对应牌号在做。有特殊需求的可以私信要一份改性PET的报价参考，比自己买基料再加助剂调试，省的不只是钱，还有试错的时间。
说白了，标准料是大锅饭，改性料是定制菜。你的制品要求越高，越需要定制。
五、常用牌号，私信给你当日报价
上面的价格都是参考价，PET行情一天一个样，原油、PTA、乙二醇、汇率都在动。
如果你需要杜邦、远纺、三房巷、华润这些品牌的具体牌号当日报价，私信我，发你一份实时价格表。不绕弯子，报实数。
写在最后
买PET这事儿，七块的和三十五的，差的不是二十八。
单价是门槛，选对用途等级和粘度才是底线。别让报价单上的数字迷惑了你——你买的不是一公斤塑料，是一公斤能做出合格制品的方案。把账算到每件制品上，再加上次品退货损失，你才知道谁真便宜谁真贵。
你在PET采购上踩过什么坑？是粘度不对还是以次充好？评论区聊聊，点赞最高的三位，送一份PET主流牌号选型对照表。
PET和PBT有什么区别
PET瓶级粘度怎么选
PET和PC有什么区别
PET改性料厂家怎么选
PET注塑常见问题及解决
How much is PET per kilogram?
PET is not one material: different grades, and each carries a different price.
1. Mainstream grade quotes (imported + domestic) — recent market references; live prices subject to same-day inquiry.
DuPont
Rynite RE5264E, approx. CNY 32/kg. high-strength; high-temperature; electronics; automotive parts.
Rynite SST35, approx. CNY 32/kg. automotive structural parts.
PET
CH-610, approx. CNY 10-11/kg. high-transparency.
PET
CZ-318, approx. CNY 7-8/kg.
CZ-328, approx. CNY 7-8/kg.
PET
CR-8863, blow molding high-transparency food-grade, approx. CNY 7-8/kg. food packaging.
CR-8816, approx. CNY 7-8/kg.
Chinese majors
WK-821, approx. CNY 7-8/kg. packaging.
2. Why prices differ so much
Four factors: (1) composition — lower levels are cheaper; higher levels give better performance but cost more. (2) viscosity — premium grades need special formulations and cost more. (3) functional modification — special applications need special formulations or certification and cost more. (4) Brand and origin — imports carry a premium but offer batch stability; for the same grade, imports cost 30-50% more than domestic, paying for quality control and R&D.
3. Procurement pitfalls
The cheapest material often fails on performance and triggers customer returns. Three traps to avoid:
First, test key properties against the COA instead of trusting the grade name — performance of the same grade can fluctuate between batches. Second, watch out for substitution fraud: some traders pass off cheaper or recycled material as the real thing; demand the COA, a test report and original packaging before use. Third, don't compare unit price alone — calculate total cost per finished part, including rejected-goods loss; a higher-priced grade with a 1% defect rate is often cheaper than a low-priced one with 5% rejects.
4. Standard grades not enough? Consider modified compounds
If standard grades always fall short — for example you need flame retardancy AND high transparency, reinforcement AND chemical resistance, or low cost AND food grade — you don't need standard PET, you need a modified compound. Ningbo Kolong New Materials is developing high-performance modified PET solutions covering glass-fiber reinforcement, flame retardancy, weatherability and conductivity. Message us for a modified PET quote reference — it saves not only money but also trial-and-error time.
In plain terms: standard grades are a big pot of shared rice; modified compounds are a dish cooked to order. The higher your requirements, the more you need customization.
5. Popular grades — same-day quotes via message
All prices above are references; PET prices change daily as feedstocks and exchange rates move. If you need same-day quotes for specific grades, message us and we will send a live price sheet. No beating around the bush — real numbers.
Final words
Unit price is the threshold; choosing the right grade and performance is the baseline. Do the math per finished part, add rejected-goods loss, and you will know who is truly cheap and who is truly expensive.
What pitfalls have you hit when buying this material? The three most-liked comments will receive a grade selection guide.
