Kimble Funnel Heavy Uniform Walls Strong Rim 100mm 
Borosilicate glass 3.3. Kimble funnels are constructed with heavy uniform walls and strong, beaded rims and fire polished stems to give a long service life. Made from borosilicate glass 3.3, these funnels have a high resistance to chemical attack and mechanical and thermal shock. ISO 4788. 100mm.