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Chromic acid and chromates																				Related Pages
Synonyms & Trade Names
			Chromic acid (CrO3), Chromic anhydride, Chromic oxide, Chromium(VI) oxide (1:3), Chromium trioxide, Zinc chromate
CAS No.
			1333-82-0 (CrO3)
	RTECS No.
			GB6650000 (CrO3)
	DOT ID & Guide
			1755 154(acid solution)1463 141(acid, solid)

FormulaCrO3 (acid)
	Conversion
	IDLH
			Ca [15 mg/m3{as Cr(VI)}]See: 1333820

Exposure Limits
			NIOSH REL(as Cr): Ca TWA 0.0002 mg/m3 (8-hours) See Appendix A See Appendix C
					OSHA PEL (as CrO3): TWA 0.005 mg/m3See Appendix C
	Measurement Methods
			**NIOSH** 7600 , 7604 , 7605 , 7703 , 9101;**OSHA** ID103 , ID215 , W4001
					
					See: NMAM or OSHA Methods
										
Physical Description
			CrO3: Dark-red, odorless flakes or powder.
					[Note: Often used in an aqueous solution (H2CrO4).]													
										
Molecular Weight100.0	
	Boiling Point482°F (Decomposes)
	Melting Point387°F (Decomposes)
	Solubility63%
	Vapor PressureVery low
	Ionization PotentialNA											
Specific Gravity2.70 (CrO3)	
	Flash PointNA
	Upper Explosive LimitNA
	Lower Explosive LimitNA
CrO3: Noncombustible Solid, but will accelerate the burning of combustible materials.
Incompatibilities & Reactivities
			Combustible, organic, or other readily oxidizable materials (paper, wood, sulfur, aluminum, plastics, etc.); corrosive to metals
Exposure Routes
			inhalation, ingestion, skin and/or eye contact
Symptoms
			irritation respiratory system; nasal septum perforation; liver, kidney damage; leukocytosis (increased blood leukocytes), leukopenia (reduced blood leukocytes), eosinophilia; eye injury, conjunctivitis; skin ulcer, sensitization dermatitis; [potential occupational carcinogen]
Target Organs
			Blood, respiratory system, liver, kidneys, eyes, skin
Cancer Site[lung cancer]										
Personal Protection/Sanitation
			(See protection codes) **Skin:**Prevent skin contact
							**Eyes:**Prevent eye contact
							**Wash skin:**When contaminated
							**Remove:**When wet or contaminated
							**Change:**Daily
							**Provide:**Eyewash, Quick drench
	First Aid
			(See procedures)**Eye:**Irrigate immediately
							**Skin:**Soap flush immediately
							**Breathing:**Respiratory support
							**Swallow:**Medical attention immediately
Respirator Recommendations
			**NIOSH****At concentrations above the NIOSH REL, or where there is no REL, at any detectable concentration:** (APF = 10,000) Any self-contained breathing apparatus that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode(APF = 10,000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode in combination with an auxiliary self-contained positive-pressure breathing apparatus**Escape:**(APF = 50) Any air-purifying, full-facepiece respirator with an N100, R100, or P100 filter. Click here for information on selection of N, R, or P filters.Any appropriate escape-type, self-contained breathing apparatus
					Important additional information about respirator selection
See also
			INTRODUCTION
					  ICSC CARD: 1194
					  MEDICAL TESTS: 0051

			
							

			Page last reviewed:  October 30, 2019						Content
							source: 	National Institute for Occupational Safety and Health NIOSH Pocket Guide to Chemical Hazards
Introduction
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Chemical Names, Synonyms and Trade Names
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CAS Numbers
RTECS Numbers
Appendices
A – NIOSH Potential Occupational Carcinogens
B – Thirteen OSHA-Regulated Carcinogens
C – Supplementary Exposure Limits
D – Substances with No Established RELs
E – OSHA Respirator Requirements for Selected Chemicals
F – Miscellaneous Notes
G – 1989 Air Contaminants Update Project: Exposure Limits NOT in Effect
Type C & CE – Definitions for Type C and Type CE Respirators
Personal Protection and Sanitation Codes
First Aid Procedures Follow NIOSH Facebook
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