"These bright red, easy to open, polypropylene (PP) Biohazard Bags are for disposal of biohazard waste and plastic laboratory items such as used tips and tubes. Bags have a clearly printed biohazard symbol and pass ASTM 1922 tear resistance and ASTM 1709 dart impact tests. Steam autoclavable for sterilization of waste before disposal. Polypropylene bags include black biohazard symbol and precautionary procedures printed in four languages (English, Spanish, French, German) for added safety High temperature steam autoclavable to 135°C (275°F) Pass ASTM 1922 Tear Resistance and ASTM 1709 Dart Impact Tests 55 microns (2.2 mil) thickness"