Ideal for jewelry and other soldering crafts Non-asbestos, made of Silquar Retains heat during soldering and can be cleaned with water Withstand temperatures up to 2200 degrees Fahrenheit 12 inch by 6 inch Silquar material is used in our non-asbestos boards. Silquar retains heat during soldering and can be easily cleaned with water. Takes heat up to 2,200 degrees Fahrenheit. 12" x 6".