USP Reference Standards are specified for use in conducting official USP–NF tests and assays. USP also provides Reference Standards specified in the Food Chemicals Codex as well as authentic substances—high-quality chemical samples—as a service to analytical, clinical, pharmaceutical and research laboratories. To confirm accuracy and reproducibility, USP Reference Standards are rigorously tested and evaluated by multiple independent laboratories including USP, commercial, regulatory, and academic labs. USP also provide publicly available, official documentary standards for pharmaceutical ingredients in the USP–NF that link directly with our primary reference standards.

Plastic Additive 1 (Ethylene bis[3,3-bis[3-(1,1-dimethylethyl)-4-hydroxyphenyl] butanoate]) CAS 32509-66-3
Plastic Additive 2 (pentaerythrityl tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate]) CAS 6683-19-8
Plastic Additive 3 (2,2',2'',6,6',6''-hexa-tert-butyl-4,4',4''-[(2,4,6-trimethyl-1,3,5-benzenetriyl)trismethylene]triphenol) CAS 1709-70-2
Plastic Additive 4 (Octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate) CAS 2082-79-3
Plastic Additive 5 (Tris(2,4-di-tert-butylphenyl) phosphite) CAS 31570-04-4
Plastic Additive 6 (1,3,5-Tris(3,5-di-tert-butyl-4-hydroxybenzyl)-s-triazine-2,4,6(1H,3H,5H)-trione) CAS 27676-62-6
Plastic Additive 8 (Dioctadecyl disulfide) CAS 2500-88-1
Plastic Additive 9 (Didodecyl 3,3'-thiodipropionate) CAS 123-28-4
Plastic Additive 10 (dioctadecyl 3,3'-thiodipropionate) CAS 693-36-7
Plastic Additive 11 (Copolymer of Dimethyl Succinate and (4-hydroxy-2,2,6,6-tetramethylpiperidin-1-yl)ethanol)) CAS 65447-77-0
Plastic Additive 12 (Oleamide) CAS 301-02-0
Plastic Additive 13 (Erucamide) CAS 112-84-5
Plastic Additive 14 (Di(2-ethylhexyl) phthalate) CAS 117-81-7
Plastic Additive 15 (Epoxidized Soya Oil) CAS 8013-07-8
Plastic Additive 16 (Epoxidized Linseed Oil) CAS 8016-11-3