CSM多少钱一公斤？
这个问题一搜，从十五块一公斤到四十块一公斤，报价差得比氯含量还多。有人说我买的十五的国产通用用得挺好，有人说我买的四十的进口高端才叫高耐候。到底差在哪？
说实话，问CSM多少钱一公斤的人，大概率还没搞懂CSM这东西不是一个料——通用级、高耐候级、耐油级、阻燃级、涂料级，每个分支价格都不一样。你拿通用级的价和高耐候比，那不叫比价，叫被忽悠。
CSM就是氯磺化聚乙烯，聚乙烯经氯化和氯磺化反应制得，耐候、耐臭氧、耐化学腐蚀，常用于橡胶制品、涂料、胶粘剂、防水卷材、电线电缆。
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。
进口CSM（外企大厂）
通用级，参考价约20-30元/公斤。橡胶制品、涂料、胶粘剂。
高耐候级，参考价约25-38元/公斤。户外应用、防水卷材、电线电缆。
耐油级，参考价约28-40元/公斤。油封、胶管、耐油制品。
国产CSM（中企大厂）
通用级，参考价约15-24元/公斤。性价比高，橡胶制品、涂料、胶粘剂。
高耐候级，参考价约18-30元/公斤。户外应用、防水卷材、电线电缆。
涂料级，参考价约16-26元/公斤。防腐涂料、建筑涂料、工业涂料。
一句话总结：国产通用15-24块，国产高耐候/涂料16-30块，进口通用20-30块，进口高耐候/耐油25-40块。你要的是啥氯含量和性能，决定了你该在哪一档选。
二、同是CSM，价差凭什么这么大
CSM的价格差，主要藏在四个地方。
第一，氯含量不同。氯含量25%左右便宜，氯含量40%以上高耐候但贵。氯含量越高，耐候性和耐油性越好，但弹性略降。
第二，磺酰氯含量不同。低磺酰氯便宜，高磺酰氯贵。磺酰氯含量决定交联密度和性能。
第三，用途不同。通用级便宜，耐油/高耐候级贵。特殊用途需要特殊配方，价格更高。
第四，品牌和产地。进口溢价高但批次稳定，国产性价比高但牌号少。同样是高耐候级，进口比国产贵30-50%，贵的是品控和研发。
三、采购避坑：别让氯含量骗了你
我见过太多采购，比价比到最后选了最便宜的十五的，然后做出来的制品耐候差、开裂、客户退货，一次损失够买半年的好料。
CSM采购这行，水比你想的深。三个坑必须绕开：
第一，看氯含量和门尼粘度不看牌号。同一个牌号不同批次性能可能波动，拿到料先测氯含量和门尼粘度，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CPE当CSM卖，拿低氯含量当高氯含量卖。要COA、要氯含量检测、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15块，做出来制品次品率5%；B料单价24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——比如要高耐候又要高弹性、要耐油又要低温柔韧、要低成本又要阻燃——那不是CSM的问题，是你需要的不是标准CSM，是改性CSM。
这时候可以看看宁波科隆新材目前在做的高性能改性CSM方案，增韧、增强、耐候、阻燃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CSM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，CSM行情一天一个样，聚乙烯、氯气、二氧化硫、磺酰氯、汇率都在动。
如果你需要进口、国产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CSM这事儿，十五的和四十的，差的不是二十五。
单价是门槛，选对氯含量和性能才是底线。别让报价单上的数字迷惑了你——你买的不是一公斤塑料，是一公斤能做出高耐候防水卷材的方案。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CSM采购上踩过什么坑？是耐候差还是开裂？评论区聊聊，点赞最高的三位，送一份CSM主流牌号选型对照表。
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CSM和EPDM有什么区别
CSM改性料厂家怎么选
CSM加工常见问题及解决
How much is CSM per kilogram? Today's quotes — the price of chlorosulfonated polyethylene hides in chlorine content
How much is CSM per kilogram?
A quick search shows quotes ranging from CNY 15/kg to CNY 40/kg — a spread wider than the chlorine content itself. Some buyers say the CNY 15 domestic general-purpose grade works fine; others insist only the CNY 40 imported premium grade counts as high weatherability. Where does the difference really lie?
Honestly, anyone asking "how much is CSM per kilo" probably has not yet understood that CSM is not a single material — general-purpose, high-weatherability, oil-resistant, flame-retardant and coating grades each carry a different price. Comparing a general-purpose quote with a high-weatherability one is not price comparison; it is how you get fooled.
CSM is chlorosulfonated polyethylene, made by chlorinating and chlorosulfonating polyethylene. It offers weatherability, ozone resistance and chemical corrosion resistance, and is commonly used in rubber products, coatings, adhesives, waterproof membranes and wire and cable.
1. Mainstream grade quotes (imported + domestic)
Here are the high-volume grades and reference prices on the market. Figures below are recent market references; live prices are subject to same-day inquiry.
Imported CSM (overseas majors)
General-purpose grade, approx. CNY 20-30/kg. Rubber products, coatings, adhesives.
High-weatherability grade, approx. CNY 25-38/kg. Outdoor applications, waterproof membranes, wire and cable.
Oil-resistant grade, approx. CNY 28-40/kg. Oil seals, hoses, oil-resistant products.
Domestic CSM (Chinese majors)
General-purpose grade, approx. CNY 15-24/kg. Cost-effective; rubber products, coatings, adhesives.
High-weatherability grade, approx. CNY 18-30/kg. Outdoor applications, waterproof membranes, wire and cable.
Coating grade, approx. CNY 16-26/kg. Anti-corrosion coatings, architectural coatings, industrial coatings.
In short: domestic general-purpose CNY 15-24, domestic high-weatherability/coating CNY 16-30, imported general-purpose CNY 20-30, imported high-weatherability/oil-resistant CNY 25-40. The chlorine content and performance you need decide which tier you belong in.
2. Why do CSM prices differ so much
The CSM price gap mainly hides in four factors.
First, chlorine content. Around 25% chlorine is cheap; above 40% gives high weatherability but costs more. The higher the chlorine content, the better the weatherability and oil resistance, but elasticity drops slightly.
Second, sulfonyl chloride content. Low sulfonyl chloride is cheap; high sulfonyl chloride costs more. Sulfonyl chloride content determines crosslink density and performance.
Third, application. General-purpose is cheap; oil-resistant/high-weatherability grades are expensive. Special applications need special formulations and cost more.
Fourth, brand and origin. Imports carry a premium but offer batch stability; domestic grades offer value but fewer options. For the same high-weatherability grade, imported costs 30-50% more than domestic — you pay for quality control and R&D.
3. Procurement pitfalls: don't let the chlorine content fool you
I have seen too many buyers end up choosing the cheapest CNY 15 material after endless price comparison, only to have parts fail on weatherability and crack, trigger customer returns — one loss enough to buy half a year of good material.
Procurement of CSM is deeper water than you think. Three traps must be avoided:
First, test chlorine content and Mooney viscosity instead of trusting the grade name. Performance of the same grade can fluctuate between batches. Test against the COA before use. Don't listen to salespeople saying "close enough" — close enough is far apart.
Second, watch out for substitution fraud. Some traders sell CPE as CSM, or low-chlorine as high-chlorine. Demand the COA, a chlorine-content test and original packaging. Only accept material with all three.
Third, don't compare unit price alone — calculate total cost. Material A at CNY 15/kg yields a 5% defect rate; material B at CNY 24/kg yields 1%. Per finished part, B is actually cheaper.
4. Standard grades not enough? Consider modified compounds
If standard grades always fall short — you need high weatherability AND high elasticity, oil resistance AND low-temperature toughness, or low cost AND flame retardancy — the problem is not CSM itself; you don't need standard CSM, you need modified CSM.
Ningbo Kolong New Materials is developing high-performance modified CSM solutions, with grades covering toughening, reinforcement, weatherability and flame retardancy. For special needs, message us for a modified CSM quote reference — it saves not only money but also trial-and-error time compared with buying base resin and tuning additives yourself.
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. CSM prices change daily — polyethylene, chlorine, sulfur dioxide, sulfonyl chloride and exchange rates all move.
If you need same-day quotes for specific imported or domestic grades, message us and we will send a live price sheet. No beating around the bush — real numbers.
Final words
For CSM, the difference between CNY 15 and CNY 40 is not CNY 25.
Unit price is the threshold; choosing the right chlorine content and performance is the baseline. Don't let the quote sheet fool you — you are not buying one kilogram of plastic, you are buying a solution for making high-weatherability waterproof membranes. Do the math per finished part, add in the loss from rejected goods, and you will know who is truly cheap and who is truly expensive.
What pitfalls have you hit when buying CSM — poor weatherability or cracking? Share in the comments; the three most-liked readers will receive a CSM grade selection guide.
