Silicon Carbide

40.09620

39.97690

206-991-8

1061

DTXSID5052751

EXCEEDINGLY HARD, GREEN TO BLUISH-BLACK, IRIDESCENT, SHARP CRYSTALS|HEXAGONAL OR CUBIC|Yellow to green to bluish black, iridescent crystals.

2849200000

0

-0.29950

Light grey powder

3.23 g/cm³

2600 °C

Sublimes

2.65

soluble in molten sodium hydroxide, potassium hydroxide and in molten iron. | soluble in molten alkalis (NaOH, KOH) and molten iron. Insoluble in water.

Store in a dry area.

0 mmHg (approx)

Noncombustible Solid

DIELECTRIC CONSTANT: 7.0; HARDNESS: 9.5; ELECTRON MOBILITY: GREATER THAN 100 SQ CM/VOLT-SEC; HOLE MOBILITY: GREATER THAN 20 SQ CM/VOLT-SEC; BAND GAP ENERGY: 2.8 ELECTRON-VOLTS|SUBLIMES WITH DECOMPOSITION AT 2700 °C|EXCELLENT THERMAL CONDUCTIVITY; ELECTRICALLY CONDUCTIVE; RESISTS OXIDATION AT HIGHER TEMPERATURES

No rapid reaction with air No rapid reaction with water

Nitrides, Phosphides, Carbides, and Silicides

SILICON CARBIDE is non-combustible. Generally unreactive. Soluble in molten alkalis (NaOH, KOH) and in molten iron.

9.30 eV

Noncombustible Solid

NONH for all modes of transport

3

R36/37/38

S26-S36

VW0450000

Xi

Stability

P201, P202, P260, P264, P270, P281, P307+P311, P308+P313, P314, P321, P405, P501

H350

Sublimes with decomposition at 4892 degrees F.

Not combustible.

|Danger|H315 (39.77%): Causes skin irritation [Warning Skin corrosion/irritation]|P201, P202, P260, P261, P264, P270, P271, P280, P281, P302+P352, P304+P340, P305+P351+P338, P308+P313, P312, P314, P321, P332+P313, P337+P313, P362, P403+P233, P405, and P501|Aggregated GHS information provided by 1049 companies from 11 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.|H350: May cause cancer [Danger Carcinogenicity]|P201, P202, P260, P264, P270, P281, P307+P311, P308+P313, P314, P321, P405, and P501|Not Classified

In case of fire in the surroundings, use appropriate extinguishing media.

Skin: No recommendation is made specifying the need for personal protective equipment for the body. Eyes: No recommendation is made specifying the need for eye protection. Wash skin: No recommendation is made specifying the need for washing the substance from the skin (either immediately or at the end of the work shift). Remove: No recommendation is made specifying the need for removing clothing that becomes wet or contaminated. Change: No recommendation is made specifying the need for the worker to change clothing after the work shift. (NIOSH, 2016)|(See protection codes)

NONCOMBUSTIBLE

WASTE SOLN CONTAINING HEAVY METALS & SILICON CARBIDE FROM METAL PLATING ARE MIXED WITH NONIONIC MATERIALS SUCH AS DIATOMACEOUS EARTH & A FLOCCULANT TO PPT SI CARBIDE. SUPERNATANT LIQ AFTER REMOVING PPT IS SAND-FILTERED & ION-EXCHANGED.

Permissible Exposure Limit: Table Z-1 8-hr Time Weighted Avg: 15 mg/cu m. /Total dust/|Permissible Exposure Limit: Table Z-1 8-hr Time Weighted Avg: 5 mg/cu m. /Respirable fraction/|Vacated 1989 OSHA PEL TWA 10 mg/cu m is still enforced in some states. /Total/|Vacated 1989 OSHA PEL TWA 5 mg/cu m is still enforced in some states. /Resp/

Recommended Exposure Limit: 10 Hr Time-Weighted Avg: 10 mg/cu m (total).|Recommended Exposure Limit: 10 Hr Time-Weighted Avg: 5 mg/cu m (resp).

Personal protection: particulate filter respirator adapted to the airborne concentration of the substance. Sweep spilled substance into covered containers.

A nuisance-causing concentration of airborne particles can be reached quickly when dispersed.

May cause mechanical irritation.

Avoid inhalation of dust.

Wear safety goggles.

A NUISANCE PARTICULATE.

Synthetic or natural materials, other than DRUGS, that are used to replace or repair any body TISSUES or bodily function. (See all compounds classified as Biocompatible Materials.)

Exposure Routes: inhalation, ingestion, skin and/or eye contact Symptoms: Irritation eyes, skin, upper respiratory system; cough Target Organs: Eyes, skin, respiratory system (NIOSH, 2016)

Eye: If this chemical contacts the eyes, immediately wash the eyes with large amounts of water, occasionally lifting the lower and upper lids. Get medical attention immediately. Contact lenses should not be worn when working with this chemical. Breathing: If a person breathes large amounts of this chemical, move the exposed person to fresh air at once. Other measures are usually unnecessary. Swallow: If this chemical has been swallowed, get medical attention immediately. (NIOSH, 2016)|(See procedures)

Fresh air, rest.

First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention.

SLIGHT RADIOGRAPHIC CHANGES /OCCURRED/ IN 10 OF 32 WORKERS EXPOSED ... TO SILICON CARBIDE. MOST ... HAD WORKED FOR 15 YR OR MORE IN DUSTY ATMOSPHERES WITH AVG DUST COUNT OF 1200 PARTICLES/CC (34 MPPCF) & AVG PARTICLE DIAMETER OF 1 MICRON. ALL CASES WERE TUBERCULIN POS. THOSE PRESENTING PULMONARY CHANGES HAD ... SLIGHT RESP SYMPTOMS.|ACUTE LOCAL: INHALATION 1; IRRITANT 1. CHRONIC LOCAL: INHALATION 1. 1= SLIGHT: CAUSES READILY REVERSIBLE CHANGES WHICH DISAPPEAR AFTER END OF EXPOSURE.|Nuisance particulate (accumulation in lungs).|Silicon carbide can alter the course of inhalation tuberculosis leading to extensive fibrosis and progressive disease.|For more Human Toxicity Excerpts (Complete) data for SILICON CARBIDE (6 total), please visit the HSDB record page.

Crystar

inhalation, ingestion, skin and/or eye contact

irritation eyes, skin, upper respiratory system; cough

Cough.

Redness. Pain.

Eyes, skin, respiratory system

Aerospace|Silicon carbide (SiC): ACTIVE|AVAILABLE FORMS: POWDER; FILAMENT; WHISKERS (3 MILLION PSI); SINGLE CRYSTALS.|LIQ WASTE OF NUCLEAR FUEL REPROCESSING CALCINED, PARTICLES OVERCOATED BY ALPHA-SILICON CARBIDE, GRAPHITE & FORMALDEHYDE-PHENOL RESIN, PRESSED, CARBONIZED & SINTERED FORMING BETA-SILICON CARBIDE MATRIX ENCLOSING WASTE.

NIOSH Method: 500. Analyte: Nuisance dusts. Matrix: Air. Procedure: Gravimetric (filter weight). For nuisance dusts this method has an estimated detection limit of 0.2 mg/sample. The precision/RSD is 0.08 mg/sample and the recovery is not determined. Applicability: The working range is 3 to 20 mg/cu m for a 100 liter air sample. Interferences: Organic and volatile particulate matter may be removed by dry ashing. /Nuisance dusts/|SOLID STATE IR SPECTROSCOPIC DETERMINATION OF SILICON CARBIDE IN RESPIRABLE DUST; PRACTICAL DETECTION LIMIT 20 UG.|NIOSH Method: 600. Analyte: Glycerin mist. Matrix: Dust. Procedure: Gravimetric (filter weighing). For glycerin (filter weighing) this method has an estimated detection limit of 0.2 mg/sample. The precision/RSD is 68 ug with 0.01 mg sensitivity balance and the recovery is not determined. Applicability: The method measures the mass concentration of any nonvolatile respirable dust. Interferences: Larger than respirable particles (over 10 um) have been found in some cases by microscopic analysis of cyclone filters. Heavy dust loadings, charged particles, fibers and water-saturated dusts also interfere with the cyclone's size-selective properties. /Glycerin mist/|DEBYE-SCHERRER X-RAY PHOTOGRAPHS OF SILICON CARBIDE DUST ARE DESCRIBED.

EPA Safer Chemical Functional Use Classes -> Processing Aids and Additives|Safer Chemical Classes -> Green circle - The chemical has been verified to be of low concern