Click Each Image Below To Enlarge: 38-439 Rexam Acid Cap 38-439 Cap Socket Canister 3 Inch Socket With the issuance of DOT Special Permit 14656, chemical packagers can now package 70% Nitric Acid in a 2.5 liter plastic bottle without an overpack, in full compliance with 49 CFR, Part 173.158. The 2.5 liter bottle, manufactured with PPQ resin, provides the chemical packager numerous benefits over glass including safety, high-purity, ease of handling, reduced inventory, and smaller package footprint.