Silicone Tapered Hole Plugs for Powder Coating Oven Masking YUNZORI | Direct Factory Price | OEM & ODM Supported | ISO 9001:2015, FDA 21 CFR 177.2600, LFGB, RoHS, REACH Product Overview These silicone tapered hole plugs for powder coating oven masking are engineered and molded in-house by Dongguan Yunze Silicone Products Co., Ltd. Manufactured from 100% platinum-cured silicone rubber with a 50°A Shore A hardness and temperature range of -40°C to +250°C (-40°F to +482°F),