Please note that this product is "made to order". Therefore an order cannot be canceled or returned even if delivery times are longer! Ideal for use with biological media, volatile solvents, corrosive chemicals and sensitive compounds The liner is ultrasonically welded to the cap to eliminate the possibility of adhesive contamination and adhesive failure common with autoclaving Available in convenient Lab Pack quantities as well as larger Case Packs Low compression set silicone, ideal for storing specimens for extended periods in wide temperature ranges PTFE or polypropylene on the exposed side of the liner imparts an inert, chemical-resistant surface Open caps provide access with a syringe AutoclavableMeer tonenMinder tonen