PAC Database - Detailed Chemical Data

Chemical Identity
Chemical CAS# UN# Health Code Numbers
Maleic hydrazide; (3,6-Pyridazinedione, 1,2-dihydro-) 123-33-1
11.01
7.01
14.01
15.02
7.00
4.07
3.09
3.10
5.10
Formula Synonyms
C4.H4.N2.O2 MALEIC HYDRAZIDE, (+/-)-3,6-DIHYDROXYPYRIDAZINE, 1,2,3,6-TETRAHYDRO-3,6-DIOXOPYRIDAZINE, 1,2-DIHYDRO-3,6-PYRADIZINEDIONE, 1,2-DIHYDRO-3,6-PYRIDAZINEDIONE, 1,2-DIHYDROPYRIDAZINE-3,6-DIONE, 3(2H)-PYRIDAZINONE, 6-HYDROXY-, 3,6-DIHYDROXYPYRIDAZINE, 3,6-DIOXOPYRIDAZINE, 3,6-PYRIDAZINEDIOL, 6-HYDROXY-2H-PYRIDAZIN-3-ONE, 6-HYDROXY-3(2H)-PYRIDAZINONE, 6-HYDROXY-3-(2H)-PYRIDAZINONE, ANTERGAN, ANTERGON, ANTYROST, BURTOLIN, CHEMFORM, DE-CUT, DE-SPROUT, DREXEL-SUPER P, ENT 18,870, FAIR 30, FAIR PLUS, FAIR PS, HYDRAZIDE MALEIQUE, KMH, MAH, MAINTAIN 3, MALAZIDE, MALEIC ACID CYCLIC HYDRAZIDE, MALEIC ACID HYDRAZIDE, MALEIC CYCLIC HYDRAZIDE, MALEIC HYDRAZIDE 30%, MALEIC HYDRAZINE, MALEIN 30, MALEPIN, MALZID, MAZIDE, MG-, MH, MH 30, MH 36 BAYER, MH-40, N,N-MALEOYLHYDRAZINE, RCRA WASTE NUMBER U148, REGULOX, REGULOX 36, REGULOX 50 W, REGULOX W, RETARD, ROYAL MH-30, ROYAL SLO-GRO, SLO-GRO, SLOW-IT, SPROUT-STOP, SPROUT/OFF, STUNTMAN, SUCKER-STUFF, SUPER DE-SPROUT, SUPER SPROUT STOP, SUPER SUCKER-STUFF, SUPER SUCKER-STUFF HC, SUPER-DE-SPROUT, VONDALHYDE, VONDRAX
Physical Properties
Mol Wt State MP (°C) BP (°C) VP (Hg) VP (°C) SG LEL (ppm)
112.1 S 1.6
PAC Values
PAC Values (Original Units: mg/m3)
PAC-1 PAC-2 PAC-3
11 130 750
Converted PAC Values (ppm)
PAC-1 PAC-2 PAC-3
2.4 28 160
Technical Basis
A review of available sources identified acute toxicity data (LD50, LC50) for various species and routes. Data sources were selected according to the hierarchy listed in Table 3.1. Toxicity data were selected according to type of exposure, species, and route according to the hierarchies stated in Sections 3.3.1, 3.3.2, and evaluated using factors in Tables 3.2, 3.3, and 3.4. Although there was a preferred inhalation data, rat LC50, the duration was not listed; therefore, it was not selected for TEEL development. The next most preferred species and route data, a rat oral LD50, was selected as the TEEL-3 basis. TEEL-1 and TEEL-2 values were derived according to Table 3.5.
• PAC-1 = TEEL-1 = TEEL-2/11
• PAC-2 = TEEL-2 = TEEL-3/6
• PAC-3 = TEEL-3 = Rat oral LD50 (3800 mg/kg)
This review generated PAC values consistent with Rev. 29A*
References
Chemical information: https://pubchem.ncbi.nlm.nih.gov/compound/Maleic-Hydrazide.
Rat oral LD50: World Review of Pest Control., 9(119), 1970. Retrieved from: https://pubchem.ncbi.nlm.nih.gov/compound/Maleic-Hydrazide.
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PAC values marked with a subscript "A" correspond to 60-minute AEGL values.
PAC values marked with a subscript "E" correspond to ERPG values.
PAC values marked by * are >= 10% lower explosive limit (LEL) but < 50% LEL.
PAC values marked by ** are > 50% LEL but < 100% LEL.
PAC values marked by *** are >= LEL.