11mm Crimp - Poly Crimp. Seals. Poly Crimp ™ seals are constructed of polypropylene that fits virtually any crimp 12 x 32mm sample vial. Use a standard crimping tool to securely crimp the Poly Crimp ™ Seal onto any crimp top vial. Available in a variety of colors with a wide range of liners: Molded Septum, Starburst, PTFE, PTFE/Butyl rubber, PTFE/Silicone, PTFE/Silicone/PTFE, and PTFE/Silicone with a slit.