4mL Disposable Glass Culture Tubes. Borosilicate glass Kimax-51 composition assures the best all-around chemical durability of commercial glasses now available for laboratory ware. Complies with ASTM Specification E438, Type I, Class B glass requirements. Kimax-51 has excellent chemical resistance against sodium leaching - a factor common in soda lime glass products. These are premium quality tubes with sturdy, uniform bottoms and consistent lengths. The 10 and 12 x 75 mm sizes are suitable for cell washing procedures. Tubes are packed in convenient trays for ease of use on bench topsand in drawers The 10 and 12 x 75 mm sizes fit into Kimble 73510 stainless steel dispensers. Trays are shrink wrapped in plastic film with tubes remaining in constant alignment for protection against in-transit breakage and contamination. Designed from ASTM Specification E890. 10 x 75 (O.D. x Length mm). Kimble #: 73500-1075.