12 x 35 mm 0.50 dram (1.85 ml) Amber borosilicate vial with 8-425 black phenolic pulp/vinyl lined cap attached. amber screw thread vials offer protection from harmful light and uv rays for light sensitive products. These general purpose glass vials are made of type i borosilicate glass, providing exceptional resistance to heat shock and chemical leaching. Attached black phenolic (thermoset) caps with pulp/vinyl liners are perfect for general use. the liner is made of a vinyl coating applied to high density polyethylene coated paper and then it is laminated to pulpboard. this general purpose liner is commonly used for food, beverage, medical and chemical applications packed at less than 120 deg f, including mild acids, alkalis, solvents, alcohols, oils and aqueous products; not recommended for active hydrocarbons or bleaches.