Low heat conductivity at high temperatures 100% asbestos free Resistance up to 1250° C Low density Has a low heat conductivity at high temperatures and resists high gas velocity, which makes it ideal for most jewellery projects. These boards are lightweight so they don't hold heat and they have a very low thermal conductivity at high temperatures. It measures 127mm W x 254mm L x 15mm T. It is 100% asbestos free, with a resistance up to 1250° C. The low density creates an excellent protection against your work table .