Shanghai Yu Hao Chemical Technology Co., Ltd. perennial cash supply Russia Chlorobutyl CBK 139 Product name: chlorinated butyl rubber CBK-139 Origin: Russia Nizhnekamsk (NIZHNEKAMASK). Performance: chlorinated butyl rubber CBK-139 is an unsaturated chlorinated butyl rubber product, which unsaturation of 1.8mol% of the product is modified butyl rubber. Airtight layer is mainly used for tire sidewall, as well as some high-temperature heat tube rubber products. Small amount for the pharmaceutical packaging products.