No need to worry about permeation of the product or an attack of the liner system by the product. These caps provide a wide range of chemical compatibility and temperature tolerance. The foam backed Teflon* PTFE resists attack from virtually all chemicals at room temperature and provides resilience for tight seal. Not autoclavable.
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Colonial Scientific has teamed up with the industry leaders, Fisher Scientific and VWR, and now offers their entire product line. Colonial Scientific provides any part from the Fisher Scientific site with a part number.