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The following are commonly used abbreviations, acronyms, and a glossary of specialized terms starting with the number:

— 1 NUMERICS —

1,1,1,2-tetrachloro 2,2-difluoroethane – chemical compound – see NIOSH.

1,1,1-trichloroethane (acronym: 1,1,1-TCE, synonyms: chloroethene, methylchloroform, aerothene tt, algylene, alpha-t, chorten, gemalgene, genklene, dowclene, solvent 111, trichloran, inhibisol) – organic chemical – (MCL = 0.2 mg/L).

1,1,2,2-terachloroethane – chemical compound – see NIOSH.

1,1,2-trichloethane – chemical compound – see NIOSH.

1,1,2-trichloroethane (acronym: 1,1,2-TCE, synonym: beta trichloroethane, beta-t, vinyl trichloride) – organic chemical – (MCL = 0.005 mg/L).

1,1-dichloro 1-nitroethane – chemical compound – see NIOSH.

1,1-dichloroethane – chemical compound – see NIOSH.

1,1-dichloroethylene (acronym: 1,1-DCE; synonyms: 1,1-dichloroethene, asym-dichloro-ethylene, vinylidene chloride) – organic chemical – (MCL = 0.007 mg/L).

1,1-dimethylhydrazine – chemical compound – see NIOSH.

1,2,4-trichlorobenzene (acronym: 1,2,4-TCB, synonyms hostetx l-pec, trichlorobenzol) – organic chemical – (MCL = 0.07 mg/L).

1,2-dibromo-3-chloropropane (abbreviation: 1,2-DB-3-CP; synonyms: DBCP, BBC 12, fumagon, fuazone, nemabrom, nemafum, nemagon, nemaax, nemapaz, nemaset, nemazon, gro-tone nematode, durham neatocide) – organic chemical, nemotoside – (MCL = 0.0002 mg/L).

1,2-dichloroethane (acronym: 1,2-DCE; synonyms: 1,2-ethylene dichloride, glycol dichloride, freon 150, borer sol, bocide, destruxol borer-sol, dichlor-mulsion, dutch oil, gransan) – organic chemical – (MCL = 0.005 mg/L).

1,2-dichloroethylene – chemical compound – see NIOSH.

1,2-dichloropropane (acronym: 1,2-DCP; synonyms: propylene dichloride, nematox, vidden d, dowfume eb-5) – organic chemical – (MCL = 0.005 mg/L).

1,3-butadiene – chemical compound – CAS number 106-99-0. ACGIH TLV = 10 PPM (22 mg/m³) TWA, A2; NIOSH REL none – potential occupational carcinigen; NIOSH IDLH 850 ppm, OSHA PEL 1,000 PPM (2,200 mg/m³) TWA; LEL 2% (10% LES, 2000 ppm).

1-chloro-1-nitropropane – chemical compound – CAS number 600259. ACGIH TLV = 2 ppm  (10 mg/m³) TWA; NIOSH REL  2 ppm (10 mg/m³) TWA; NIOSH IDLH 100 ppm, OSHA PEL  2 ppm (10 mg/m³) TWA; LEL noncombustible liquid.

1-nitropropane – chemical compound – see NIOSH.