Validity period Since May 15, 2011, Bayer MaterialScience will increase the price of the following products sold in North America: MDI products will increase by US$0.1 per pound; TDI products will increase by US$0.15 per pound; Alcohol products increased by $0.15 per pound. Silicone Molds,Resin Molds,Silicone Sphere Mold,Custom Silicone Molds Dongguan Huayuan Electronic Technology Co., Ltd , https://www.siliconefactory-oem.com