Feature●This Capillary Melting Point Tube is made of Kimax-51 glass●The tubes have a thinner wall with both ends open and are designed from requirements contained in United States Pharmacopeia●Length: 90mm; I.D. 1.5-1.8mm●Wall Thickness: 0.2mm●Packed in vialsDescription These 100mm open ended U.S.P. Capillary Melting Point Tubes are made of Kimax-51 glass and designed from requirements contained in United States Pharmacopeia (USP). Length: 100mm. I.D.: 0.8-1.1mm. Wall Thickness: 0.25mm. Kimble #: 34502-99.