PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hypophosphorus acid; (Phosphonic acid) | 6303-21-5 | 3264 |
14.01
11.01
14.02
7.01
4.07
3.06
3.07
7.11
|
|||||||||
| Formula | Synonyms | |||||||||||
| H3.O2.P | HYPOPHOSPHOROUS ACID (CORROSIVE LIQUID, ACIDIC, INORGANIC, N, DIHYDROXYPHOSPHINE, HYDROXYPHOSPHINE OXIDE, HYPOPHOSPHOROUS ACID, PHOSPHINE OXIDE, HYDROXY-, PHOSPHONOUS ACID | |||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 66 | S | 26.5 | 130 | 1.439 |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 1.2 | 13 | 79 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 0.44 | 4.8 | 29 |
Technical Basis
A review of available sources did not identify acute toxicity data or exposure limits for hypophosphorus acid. Reported GHS health hazard ratings (H314 and H318; Category 1) indicate a high-level hazard, approximately equivalent to an HHR=3. Analyst assumed an HHR=3 as the TEEL-3 basis (Section 3.4.5). TEEL-2 and TEEL-1 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 = HHR=3
This review generated PAC values inconsistent with Rev. 29A. The Rev. 29A TEEL-1 basis was a TLV-TWA for particles not otherwise specified (Section 3.5.2), from which the TEEL-2 and TEEL-3 were derived (Table 3.5). The current TEEL-3 basis is an assumed HHR=3, from analysis of GHS health hazard statements, from which TEEL-2 and TEEL-1 were derived (Table 3.5).
• PAC-1 = TEEL-1 = TEEL-2/11
• PAC-2 = TEEL-2 = TEEL-3/6
• PAC-3 = TEEL-3 = HHR=3
This review generated PAC values inconsistent with Rev. 29A. The Rev. 29A TEEL-1 basis was a TLV-TWA for particles not otherwise specified (Section 3.5.2), from which the TEEL-2 and TEEL-3 were derived (Table 3.5). The current TEEL-3 basis is an assumed HHR=3, from analysis of GHS health hazard statements, from which TEEL-2 and TEEL-1 were derived (Table 3.5).
References
Chemical information and GHS health hazard ratings retrieved from: https://pubchem.ncbi.nlm.nih.gov/compound/Hypophosphorous-acid