LEWCO Style 1200 HT-O, 1800 HT-O and 3600 HT-O are made of 98% pure continuous filament amorphous silica material.  The intended use for these products is in all high temperature applications where the need for thermal insulation and/or protection is required.  Offers excellent protection against heavy sparks, spatters, and molten slag. LEWCO Style 1800HT-O has been tested and meets NFPA 701-1999 Fire Tests for Flame-Resistant Textiles and Films Method 1. LEWCO Style 3600HT-O has been tested and meets NFPA 701-1999 Fire Tests for Flame-Resistant Textiles and Films Method 2.