SILICON CARBIDE†

Chemical Identification
Chemical Identification
CAS # 409-21-2
Formula

SiC

Synonyms

carbon silicide; carborundum; silicon monocarbide

Physical Properties
Physical Properties
Physical description Yellow to green to bluish-black, iridescent crystals.
Boiling point sublimes Molecular weight 40.1
Freezing point/melting point 4892°F (sublimes) Vapor pressure 0 mmHg (approx)
Flash point Vapor density
Specific gravity 3.23 Ionization potential 9.30 eV
Lower explosive limit (LEL) Upper explosive limit (UEL)
NFPA health rating NFPA fire rating
NFPA reactivity rating NFPA special instruction
Vapor hazard ratio (VHR)
Historical exceedance percentage
Target organs
Monitoring Methods Used by OSHA
Monitoring Methods Used by OSHA
Analyte code (IMIS no.) 2236 (total); request using analyte code 9135 S123 (resp); request using analyte code 9130
Sampling group
Sampler/Sampling media Tared low-ash 37 mm PVC filter, 5 microns [SLTC108] Tared low-ash 37 mm PVC filter, 5 microns, preceded by 10 mm nylon Dorr-Oliver cyclone for respirable samples. [SLTC108]
Sampling time*

240-480 min

240-480 min

Sampling volume (TWA)*

960 L

816 L

Sampling flow rate (TWA)*

1.7 L/min ±5%

Sampling volume (STEL/Peak/C)*
Sampling flow rate (STEL/Peak/C)*
Analytical method instruments Gravimetric Gravimetric
Method reference OSHA PV2121 (partially validated) OSHA PV2121 (partially validated)
Notes

If the net weight of the sample yields a concentration below the PEL after considering the associated SAE , the SLTC will perform no further work on the sample and the sample air concentration will be reported as the calculated gravimetric air concentration. If the net weight corresponds to an amount greater than the PEL value after considering the associated SAE, the sample may be analyzed for  the applicable component and appropriate results will be reported.

If the filter is not overloaded, samples can be collected up to an 8-hour period. If the net weight of the sample yields a concentration below the PEL after considering the associated SAE , the SLTC will perform no further work on the sample and the sample air concentration will be reported as the calculated gravimetric air concentration. If the net weight corresponds to an amount greater than the PEL value after considering the associated SAE, the sample may be analyzed for  the applicable component and appropriate results will be reported.

Special requirements

FOR TOTAL DUST SAMPLES, DO NOT USE A CYCLONE!!

* All sampling instructions above are recommended guidelines for OSHA Compliance Safety and Health Officers (CSHOs), please see the corresponding OSHA method reference for complete details.

Wipe Method
Wipe Method
Sampler/Sampling media
Bulk Method
Bulk Method
On-Site Screening Techniques
On-Site Screening Techniques
Device
Model/Type
Sampling information
(see manufacturer instructions)
Exposure Limits
Exposure Limits
OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
NIOSH REL
Up to 10-hour TWA
(ST) STEL
(C) Ceiling
ACGIH TLV©
8-hour TWA
(ST) STEL
(C) Ceiling
CAL/OSHA PEL
8-hour TWA
(ST) STEL
(C) Ceiling
Peak
PEL-TWA

15 mg/m³ (total dust), 5 mg/m³ (respirable fraction)

REL-TWA

10 mg/m³ (total dust), 5 mg/m³ (resp)

TLV-TWA

Nonfibrous: 10 mg/m³ (inhalable particulate matter), 3 mg/m³ (respirable particulate matter) *The values are for particulate matter containing no asbestos and <1% crystalline silica. Fibrous (including whiskers): 0.1 f/cc (respirable fibers), see footnote [F] in the TLV booklet. [2002]

PEL-TWA

10 mg/m³ (total dust), 5 mg/m³ (respirable fraction)

PEL-STEL REL-STEL TLV-STEL PEL-STEL
PEL-C REL-C TLV-C PEL-C
Skin notation

N

Skin notation

N

Skin notation

N

Skin notation

N

Notes:

See 29 CFR 1910.1000 Table Z-1.

Notes: Notes: Notes:

As Particulates not otherwise regulated, see footnote [n].

Health factors:  See NIH-NLM PubChem. IDLH
Carcinogenic classifications: TLV-A2 (fibrous, including whiskers) Notes:
AIHA emergency response planning guidelines - ERPG-1/ERPG-2/ERPG-3:
Additional Resources and Literature References
Additional Resources and Literature References

NOAA: CAMEO Chemicals - Silicon carbide

NIOSH: Pocket Guide to Chemical Hazards - Silicon carbide

Literature References

  • ACGIH: Documentation of the Threshold Limit Values (TLVs) and Biological Exposure Indices (BEIs) - Silicon carbide. See annual publication for most recent information.

Last Updated Date : 01/12/2021