Glass Funnel, Short Stem, available in 3 sizes with a 60 degree angle for precise fitting of filter paper. Funnel is constructed with Borosilicate 3.3 glass, heavy uniform walls, molded rims, and a fire polished stem to give a long service life. Funnels have a high resistance to chemical attack, and mechanical and thermal shock. Designed from ASTM Specification E1905, Type 1, Class A requirements.