Designed specifically for use in welding areas, WeldSafe's new, 9/16" thick surface expertly repels sparks and hot metal shards. It offers extra durability in heavy use situations and has a higher melt point of over 500 Degrees Fahrenheit. Its super resilient, Nitricell sponge base is a PVC/Nitrile rubber blend that offers immediate rebound and unparalleled support and comfort during long, strenuous shifts. Depend on WeldSafe to out-perform traditional anti-fatigue matting in spot-welding applications. Now available in a UltraSoft version that has a double thick 7/8" Nitricell sponge base. For use in dry welding areas. Weldsafe's durable rubber surface repels sparks and hot metal shards while its Nitricell sponge base provides premium comfort and resilience. (Not for use around slag.) While many people had previously thought that mats could not be used in welding areas, now WeldSafe offers a solution to standing worker fatigue. Test specifications and results are MVSS 302 Flammability (surface) - "A" rating. It has a flame spread of 1.0/Wet COF = .32, ASTM F355 Impact Absorption - Peak deceleration 9.5g duration/msec 307.0, ASTM D575 Compression - Deflection at 35 psi/mm=7.85, ASTM C501 Abrasion Resistance - Wear index, 1/g = 59.3, ASTM D412 Tensile Strength - Longitudinal 800 psi, ASTM D412 Elongation - Longitudinal 150 percente, Wearwell Requirements Density (sponge) - > 7 lbs./ft (3), ASTM D395-98 Accelerated Compression -