TLG® melting point capillary tubes are used to determine the point at which a solid sample turns to liquid. Tubes are 100mm and 90mm long when supplied with both ends open and sealed at one end respectively. Tube length insures that the open end will extend well above the bath's surface to prevent the bath liquid from entering the tube. Packeged as 500 tubes per vial and 4 vials per case. USP Type I and ASTM E438, Type I, Class B Requirement.