Magnetic crimp caps for CTC Autosampler. 100/pk . Aijiren vials are available in clear or amber glass, as well as polypropylene. Sample Vials and Accessories. Crimp caps squeeze the septum between the rim of the glass vial and has a PTFE/silicone septum bonded to the polypropylene cap, using. Labware Tubes, Caps, Vials, and Racks Vials