Funnel Filter 75mm, Borosilicate glass, plain at 60° angle-EIS-CH0456C offers a thoughtfully designed, durable resource for hands-on learning. Funnel Filter 3" Diameter Made of Borosilicate Glass Pitch of 60° angle. One Funnel Can be held by Eisco Ring clamp CH0674B with Metal ware stand MTST1 or STRD1 Eisco Labs Borosilicate glass Funnel Filter 3" Diameter, Pitch of 60° angle. Long stem 2.75" One Funnel Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.