... special nylon, has high enough strength and operation temperature for welding main specifation:filter dimension:110*90*5mm( 4 1/3 ... special nylon, has high enough strength and operation temperature for welding. Ample mask space,safety structure,excellent face protection for ... /2X1/5)108X50.8X5mm(4-1/4X2X1/5) Mask and auto darkening filter meet with CE and ANSI standard. Operature temperature: -10 ...