Rapid ECH0457D Funnel Powder is an industrial quality powder funnel made of polypropylene plastic. Excellent for transferring powdered or liquid reagents. Funnels have a parallel stem with minimizes bridging of powder. Designed for use in professional laboratories, but is an ideal choice for science classrooms and household use. Dimensions: Top diameter: 150mm (6") Total length: 135mm (5.3") Stem length: 31mm (1.2") Stem O.D.: 27mm (1.1") Autoclavable, with superior chemical durability and heat tolerance. Can withstand temperatures ranging from -20°C to 135°C.