Custom Molded Silicone Bellows for Protection Boots YUNZORI | Direct factory price | OEM & ODM supported | ISO 9001:2015, FDA 21 CFR 177.2600, LFGB, RoHS, REACH Product Overview Custom Molded Silicone Bellows for Protection Boots are engineered and molded in-house by Dongguan Yunze Silicone Products Co., Ltd. Manufactured from 100% platinum-cured silicone rubber (50°A Shore A, -40°C to +250°C / -40°F to +482°F), these custom molded parts are designed for demanding industrial