SIS多少钱一公斤？
这个问题一搜，从十五块一公斤到三十五块一公斤，报价差得比异戊二烯含量还多。有人说我买的十五的国产通用用得挺好，有人说我买的三十五的进口高端才叫高粘性。到底差在哪？
说实话，问SIS多少钱一公斤的人，大概率还没搞懂SIS这东西不是一个料——通用级、高粘性级、耐候级、充油级、干胶级，每个分支价格都不一样。你拿通用级的价和高粘性比，那不叫比价，叫被忽悠。
SIS就是苯乙烯-异戊二烯-苯乙烯嵌段共聚物，热塑性弹性体，高粘性、易加工，常用于胶粘剂、胶带、标签、密封件、玩具。
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SIS（外企大厂）
通用级，参考价约20-28元/公斤。胶粘剂、胶带、标签。
高粘性级，参考价约23-32元/公斤。高端胶带、医用胶带、特殊胶粘剂。
耐候级，参考价约25-35元/公斤。户外应用、汽车配件、建筑材料。
国产SIS（中企大厂）
通用级，参考价约15-22元/公斤。性价比高，胶粘剂、胶带、标签。
高粘性级，参考价约18-28元/公斤。高端胶带、医用胶带、特殊胶粘剂。
充油级，参考价约12-18元/公斤。软质制品、玩具、密封件。
一句话总结：国产充油12-18块，国产通用15-22块，国产高粘性18-28块，进口通用20-28块，进口高粘性/耐候23-35块。你要的是啥异戊二烯含量和性能，决定了你该在哪一档选。
二、同是SIS，价差凭什么这么大
SIS的价格差，主要藏在四个地方。
第一，异戊二烯含量不同。异戊二烯含量60%左右便宜，含量80%以上高粘性但贵。异戊二烯含量越高，粘性和弹性越好，但强度略降。
第二，充油与否不同。干胶贵，充油便宜。充油级比干胶便宜20-30%，但性能略降。
第三，耐候等级不同。通用级便宜，耐候级贵。耐候需要特殊稳定剂，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。同样是高粘性级，进口比国产贵30-50%，贵的是品控和研发。
三、采购避坑：别让异戊二烯骗了你
我见过太多采购，比价比到最后选了最便宜的十二的充油级，然后做出来的胶带粘性差、出油、客户退货，一次损失够买半年的好料。
SIS采购这行，水比你想的深。三个坑必须绕开：
第一，看粘性和拉伸强度不看牌号。同一个牌号不同批次性能可能波动，拿到料先测粘性和拉伸强度，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SBS当SIS卖，拿充油级当干胶卖。要COA、要异戊二烯含量检测、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12块，做出来胶带次品率5%；B料单价18块，次品率1%。算到每卷胶带上，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——比如要高粘性又要耐候、要高强度又要软质、要低成本又要医用级——那不是SIS的问题，是你需要的不是标准SIS，是改性SIS。
这时候可以看看宁波科隆新材目前在做的高性能改性SIS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SIS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，SIS行情一天一个样，苯乙烯、异戊二烯、填充油、稳定剂、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SIS这事儿，十二的和三十五的，差的不是二十三。
单价是门槛，选对异戊二烯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，是一公斤能做出高粘性胶带的方案。把账算到每卷胶带上，再加上次品退货损失，你才知道谁真便宜谁真贵。
你在SIS采购上踩过什么坑？是粘性差还是出油？评论区聊聊，点赞最高的三位，送一份SIS主流牌号选型对照表。
SIS和SBS有什么区别
SIS异戊二烯含量怎么选
SIS和SEBS有什么区别
SIS改性料厂家怎么选
SIS加工常见问题及解决
How much is SIS per kilogram?
SIS is not one material: high-adhesion, weatherability, oil-extended, dry rubber, and each carries a different price.
1. Mainstream grade quotes (imported + domestic) — recent market references; live prices subject to same-day inquiry.
Imported SIS
general-purpose, approx. CNY 20-28/kg. adhesives; tape; labels.
high-adhesion, approx. CNY 23-32/kg. medical tape.
weatherability, approx. CNY 25-35/kg. outdoor applications; automotive parts; construction materials.
Domestic SIS
general-purpose, approx. CNY 15-22/kg. adhesives; tape; labels.
high-adhesion, approx. CNY 18-28/kg. medical tape.
oil-extended, approx. CNY 12-18/kg. soft products; toys; seals.
2. Why prices differ so much
Four factors: (1) composition — lower levels are cheaper; higher levels give better performance but cost more. (2) oil extension — premium grades need special formulations and cost more. (3) weatherability grade — 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 SIS, you need a modified compound. Ningbo Kolong New Materials is developing high-performance modified SIS solutions covering glass-fiber reinforcement, flame retardancy, weatherability and conductivity. Message us for a modified SIS 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; SIS 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.
