... high concentration of gaseous oxygen or liquid oxygen involved.Specificatin:Thickness: 0.075mm---(Tolerance+/-0.015mm 0.1mm---(Tolerance+/-0.02mm)Width : 12mm,13mm,18mm ... ,24mm,26mm,52mm,100mm,150mm (Tolerance 0.5mm)Length: 5mm,10mm,15mm,20mm,40mm,60mm,80mm,100mm ...