18 oz Heat Treated Fiberglass. An economical welding blanket that will withstand temperatures to 1000 degrees. Ideal for insulation pads, pipe lagging, safety barriers curtains and shields. These blankets resist most acids, alkalis and solvents. Provides protection from sparks and light splatter. Custom sizes available upon request. Pre-finished size tarpauline may actually finish 3-5% less in size. Need to specify on the PO if a specific finished sizes is required.