1 Dram Flint Round Glass Vial With 13-425 Neck Finish. Common for lab and fragrance oil use. Vial is made of USP Type 1, Class A and B borosilicate glass. Capable of handling temperatures over 200 degree C, able to withstand any type of sterilization procedures. This vial features a flat bottom and no mold seam lines to impact processing in automated filing. Available with Phenolic thermoset plastic cap that makes this package autocalveable. Excellent resistance to chemical corrosion and low moisture.