Funnel Filter 100mm, Borosilicate glass, plain at 60° angle-EIS-CH0456D offers a thoughtfully designed, durable resource for hands-on learning. Borosilicate Glass Funnel Filter 10cm Plain at 60° angle The borosilicate glass funnel filter with plain at a 60° angle is a sturdy tool that is ideal for transferring solutions from one vessel to another with minimal spilling and solution loss. Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.