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Phosphoric acid																				Related Pages
Synonyms & Trade Names
			Orthophosphoric acid, Phosphoric acid (aqueous), White phosphoric acid
CAS No.
			7664-38-2
	RTECS No.
			TB6300000
	DOT ID & Guide
			1805 154(liquid or solution)3453 154(solid)

FormulaH3PO4
	Conversion
	IDLH
			1000 mg/m3See: 7664382

Exposure Limits
			NIOSH RELTWA 1 mg/m3 ST 3 mg/m3OSHA PEL TWA 1 mg/m3See Appendix G
	Measurement Methods
			**NIOSH** 7903;**OSHA** ID165SG
					
					See: NMAM or OSHA Methods
										
Physical Description
			Thick, colorless, odorless, crystalline solid.
					[Note: Often used in an aqueous solution.]													
										
Molecular Weight98.0	
	Boiling Point415°F
	Melting Point108°F
	SolubilityMiscible
	Vapor Pressure0.03 mmHg
	Ionization Potential?											
Specific Gravity(77°F): 1.87 (pure) 1.33 (50% solution)	
	Flash PointNA
	Upper Explosive LimitNA
	Lower Explosive LimitNA
Noncombustible Solid
Incompatibilities & Reactivities
			Strong caustics, most metals
					[Note: Readily reacts with metals to form flammable hydrogen gas. DO NOT MIX WITH SOLUTIONS CONTAINING BLEACH OR AMMONIA.]
Exposure Routes
			inhalation, ingestion, skin and/or eye contact
Symptoms
			irritation eyes, skin, upper respiratory system; eye, skin, burns; dermatitis
Target Organs
			Eyes, skin, respiratory system
										
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 (>1.6%), Quick drench (>1.6%)
	First Aid
			(See procedures)**Eye:**Irrigate immediately
							**Skin:**Water flush immediately
							**Breathing:**Respiratory support
							**Swallow:**Medical attention immediately
Respirator Recommendations
			**NIOSH/OSHA****Up to 25 mg/m3**: (APF = 25) Any supplied-air respirator operated in a continuous-flow mode***Up to 50 mg/m3**:(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.(APF = 50) Any self-contained breathing apparatus with a full facepiece(APF = 50) Any supplied-air respirator with a full facepiece**Up to 1000 mg/m3**: (APF = 2000) Any supplied-air respirator that has a full facepiece and is operated in a pressure-demand or other positive-pressure mode**Emergency or planned entry into unknown concentrations or IDLH conditions:** (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: 1008

			
							

			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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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
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