PP. Transparent. With NS stopper made of PP. - Stopper type A: with square-knob cap and red core. - Stopper type B: with octagonal-knob cap and red core. Good chemical resistance, ideal for long-term storage of liquids. Autoclavable at 121 °C (2 bar) acc. to DIN EN 285. PP. Transparent. With NS stopper made of PP. - Stopper type A: with square-knob cap and red core. - Stopper type B: with octagonal-knob cap and red core. Good chemical resistance, ideal for long-term storage of liquids. Autoclavable at 121 °C (2 bar) acc. to DIN EN 285.