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

— 2 NUMERICS —

2 aminopyradine – chemical compound – CAS number 504-29-0. ACGIH TLV = 0.5 PPM (2 mg/m³),  IDLH = 5 ppm, NIOSH REL 0.5 PPM (2 mg/m³),  TWA, OSHA PEL 0.5 PPM (2 mg/m³). 

2 aminopyridine – chemical compound – CAS number 504-29-0. ACGIH TLV = 0.5 PPM (mg/m³), 1.9 IDLH =0.5 5 ppm, NIOSH REL 0.5 PPM (2 mg/m³) TWA, OSHA PEL 0.5 PPM (2 mg/m³).

2,4,5-T – chemical compound – see NIOSH.

2,4,5-TP (synonym: silvex) – organic chemical – (MCL = 0.05 mg/L).

2,4-D (synonyms: agent white, bladex-b, brush killer 64, dicofur, dormon, ipaner, moxon, netagrone, pielik, verton 38, mota maskros, sivaprop 1, agricom D, acme LV4, croprider, fernesta, lawn-keep, pennamine D, plantgard, tributan, weed-B-gon weedatual, weedatul, aroxone, weedar, salvo, green cross wee-no0more 80, red devil dry weed killer, scott’s 4xd, weed-rhap lv40, weedone 100, 2,4, dichloro-pheonoxyacetic acid – organic chemical compound – (MCL = 0.07 mg/L). – see NIOSH.

2-butanone – chemical compound – CAS number 78933. ACGIH TLV = 200 PPM (590 mg/m³) TWA, 300 PPM (885 mg/m³) STEL; NIOSH REL 200 PPM (590 mg/m³) TWA, 300 PPM (885 mg/m³) STEL; NIOSH IDLH 850 ppm, OSHA PEL 200 PPM (590 mg/m³) TWA, 300 PPM (885 mg/m³) STEL; LEL 1.4% (10% LEL@200EF) 1,400 ppm).

2-butoxyethonol – chemical compound – CAS number 111762. ACGIH TLV = 25 PPM (120 mg/m³) TWA; NIOSH REL 5 PPM (24 mg/m³) TWA; NIOSH IDLH 700 ppm, OSHA PEL 25 PPM (120 mg/m³) TWA; LEL 1.1% (10% LEL@200F) 1,100 ppm).

2-diethylaminoethanol – chemical compound – see NIOSH.

2-ethoxyethanol – chemical compound – see NIOSH.

2-ethoxyethanol – chemical compound – see NIOSH.

2-ethoxyethyl acetate – chemical compound – see NIOSH.

2-hexanone – chemical compound – see NIOSH.

2-nitropropane – chemical compound – see NIOSH.

2-pentanone – chemical compound – see NIOSH.