Material: DURAN ® glass. Autoclavable: yes. Amber coloured with unaltered DURAN ® characteristics inside the bottle as only the exterior is coated. Long useful life and brown colouring has good chemical resistance. Light protection: absorption in short wave range up to 500 nm. With DIN GL thread and pitch Bottles up to 25 ml, with a specially shaped glass edge, so no pouring ring is required Bottles from 100 to 2000 ml: ring-shaped reinforcement in the bottles’ shoulder, shows the bottles’ nominal content With printed retrace code (batch code) Acc. to ISO 4796-1 Screw top bottle DURAN ® brown glass with pouring ring and PP screw cap