Customized .5ml vial for hplc with ptfe liner pp cap-Aijiren 27262. black polypropylene hole cap, thread for 8-425, PTFE/silicone, septum thickness .5 mm, for use with 2 mL vial (standard opening), pkg of 00 ea. Pricing. 27273. black polypropylene hole cap, thread for 0-425, PTFE/silicone, septum thickness .5 mm, for use with 2 mL vial. Get Price.