Caps, Screw Top, Solid, with Blue PTFE / EPDM Rubber / Blue PTFE Liner, fitted in knurled polypropylene, White Caps. For use with 24-400mm threaded EPA Style vials. ND24 threads. MicroSolv Brand. 100/PK.
Liner is 65 Shore A, (Hardness), is 2.0mm thick and can be used for for long term storage with any 30, 40 or 60 vial that has 40-400 threads.
EPDM is an M-Class rubber under ASTM standard D-1418; the M class comprises elastomers having a saturated chain of the polyethylene type. EPDM is made from ethylene, propylene, and a diene co-monomer that enables crosslinking via Sulfur vulcanization.
Solid top cap does not have an opening and is designed for storage or transportation.