DescriptionDURAN® Plastic stopper, PE, 34/35 SpecificationsFeaturesDocuments DURAN® Plastic stopper, PE, 34/35 Neck NS34/35 Material PE Colour Wit For chemical and thermal resistance, see our chemical and thermal resistance page. Non-DIN size. Note on using DURAN® glass stoppers with soda-lime glass bottles: If the bottle and the stopper have a temperature differerence greater than 30 °C, the glass stoppers can become stuck!