Asbestos
CAS Number
1332-21-4Synonym
Asbestos fiber; Ascarite; Calidria-asbestos
Occurrence/Use
Heat resistant agent used in construction materials, clothing, disk brake pads, gaskets. Use in the US banned for spray-applied surfacing (1973, 1978, 1990); pipe and block insulation on facility components (1975); papers, flooring felt, and rollboard (1976); artificial embers and wall-patching compounds (1977).
| Latest Criteria: |
California Public Health Goals
|
|---|---|
| Inhalation Unit Risk (μg/cubic meter)-1: |
6.3 E-2
|
| Inhalation Slope Factor (mg/kg-day)-1: |
2.20 E+2
|
| Oral Slope Factor (mg/kg-day)-1: |
1.4 E-13 (fibers/L water)^-1
|
| Comments/References: |
OEHHA 2009. Air Toxics Hot Spots Program Technical Support Document for Cancer Potencies. Appendix B. Chemical-specific summaries of the information used to derive unit risk and cancer potency values. Updated 2011.
OEHHA 2003. Public Health Goal for Asbestos.
Note: Inhalation unit risk can also be expressed as 1.9 E-4 (100 PCM fibers/m^3)^-1. |
Air
Proposition 65
| Cancer: |
Currently listed
|
|---|
| Listed as causing: |
Cancer
|
|---|---|
| Date of Listing: |
02/27/1987
|
| Basis for Listing: |
Labor Code
|
| Cancer | |
| No Significant Risk Level (NSRL) - Inhalation: |
100 fibers/day ᵈ
|
|---|
Water
| Health Risk Category: |
Carcinogenicity
|
|---|---|
| Public Health Goal (mg/L): |
7 million fibers/L
|
| Public Health Goal - Download: | |
| Cancer Risk at PHG: |
0.000001
|
| MCL value (mg/L): |
7 million fibers/L
|
| Cancer Risk at MCL: |
0.000001
|
| Last PHG Revision : |
2003
|
Comments
d Fibers equal to or greater than 5 micrometers in length and 0.3 micrometers in width, with a length to width ratio of greater than or equal to 3:1 as measured by phase contrast microscopy.