PAC Database - Detailed Chemical Data
Chemical Identity
| Chemical | CAS# | UN# | Health Code Numbers | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Calcium oxide | 1305-78-8 | 1910 |
14.01
11.01
14.02
4.08
4.07
3.11
3.12
|
|||||||||
| Formula | Synonyms | |||||||||||
| CaO | CALCIUM OXIDE, AIRLOCK, BELL CML(E), BELL CML(P), BURNED LIME, BURNT LIME, CALCIA, CALCIA (CAO), CALCIUM MONOXIDE, CALOXAL CPA, CALOXOL CP 2, CALOXOL W 3, CALX, CALXYL, CML 21, CML 31, CML 35, DESICAL P, LIME, OXIDO DE CALCIO (DOT SPANISH), OXYDE DE CALCIUM (DOT FRENCH), PEBBLE LIME, QC-X, QUICK LIME, QUICKLIME, QUICKLIME (CAO), RHENOSORB C, RHENOSORB F, UNSLAKED LIME, VESTA PP | |||||||||||
Physical Properties
| Mol Wt | State | MP (°C) | BP (°C) | VP (Hg) | VP (°C) | SG | LEL (ppm) |
|---|---|---|---|---|---|---|---|
| 56.08 | S | 2613 | 2850 | 3.37 |
PAC Values
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 6.0 | 42 | 250 |
| PAC-1 | PAC-2 | PAC-3 |
|---|---|---|
| 2.6 | 18 | 110 |
Technical Basis
A review of limited available sources identified the following: TLV-TWA, IDLH and mouse LD50 toxicity data. The data sources were selected according to the hierarchy listed in Table 3.1. Toxicity data were evaluated using factors in Tables 3.2, 3.3, and 3.4. The IDLH (1990), although listed as “Effective”, is based on severe impact to respiration and is therefore appropriate for TEEL development. The IDLH (1990) was selected as the TEEL-3 basis. TEEL-2 values were derived according to Table 3.5. The TLV-TWA was selected as the TEEL-1 basis.
• TEEL-1 = TLV-TWA (2 mg/m3) x 3
• TEEL-2 = TEEL-3/6
• TEEL-3 = IDLH (1990, 250 mg/m3)
This review generated TEEL-3 and TEEL-2 values that are more conservative than Rev. 29A. In Rev. 29A, a mouse LD50 was selected as the TEEL-3 basis. The current recommendation is a more preferred source (IDLH > LD50, Table 3.1). Current TEEL-1 values are consistent with Rev. 29A.
• TEEL-1 = TLV-TWA (2 mg/m3) x 3
• TEEL-2 = TEEL-3/6
• TEEL-3 = IDLH (1990, 250 mg/m3)
This review generated TEEL-3 and TEEL-2 values that are more conservative than Rev. 29A. In Rev. 29A, a mouse LD50 was selected as the TEEL-3 basis. The current recommendation is a more preferred source (IDLH > LD50, Table 3.1). Current TEEL-1 values are consistent with Rev. 29A.
References
https://cameochemicals.noaa.gov/chemical/311
https://www.cdc.gov/niosh/idlh/1305788.html
VCVN1,115,1988; RTECS: https://www.cdc.gov/niosh-rtecs/EW2F4D60.html