网页Polypropylene caps are chemically inert and suitable for most chromatography applications Shop Fisherbrand 10mm PP Screw Seal, Black, Center hole, 10-425 thread, Fisherbrand™ 10mm PP Screw Seal, Black, Center hole, 10-425 thread, Assembled septum: Autosampler Vial Caps and Closures Autosampler Vials, Caps, and