UN Number: 1805 - CAS Number: 7664-38-2

Also known as: ACIDE PHOSPHORIQUE liquide, Orthophosphoric Acid, O-Phosphoric Acid, White Phosphoric Acid, Phosphoric Acid, Hydrogen Phosphate, Acide Phosphorique
Information on chemical

Information on chemical

External resources

CAMEO Chemical Database
WISER Substance List


UN number 1805
CAS number 7664-38-2
Formula H3PO4

Physical chemical data

Physical State (20°C) Liquid
Physical State (25°C) Liquid
Density (kg/m3)
1892 [Kg/m³] at a temperature of 20°C
Kinematic viscosity (cSt)
140 [cSt] at a temperature of 20°C
100 [cSt] at a temperature of 25°C
Molar mass (g/mol) 98
Solubility (g/L)
1863000 [g/L] at a temperature of 20°C and salinity of 0‰
1863000 [g/L] at a temperature of 25°C and salinity of 0‰
Boiling Point (°C) 130
Melting Point (°C) 42
Specific heat capacity (J/(Kg·K)) 1480
Henry's constant (mol/(m³·Pa)) 0

Behaviour at sea

Log kow 0.21
Log koc 1.21
Aqueous photolysis (Half-life) Not photolysable
Biodegradation in estuary environment (Half-life) (days) 1
Biodegradation in marine environment (Half-life) (days) Not biodegradable

Additional data

Colour colourless
Odour odourless
MARPOL pollution category
Category Description
Z Noxious Liquid Substances which, if discharged into the sea from tank cleaning or deballasting operations, are deemed to present a minor hazard to either marine resources or human health and therefore justify less stringent restrictions on the quality and quantity of the discharge into the marine environment.

Transportation data

Transport mode Bulk,Packaged
Package group III
State liquid
Temperature (°C) ambient
Pressure (Pa) ambient
Family name non-oxid. min. acids

Reactivity data

Water Yes
Abilities Miscible in water.
Acid(s) Yes
Base(s) Yes
Metal(s) and alloys Yes
Oxidizing agents Yes
Reducing agents No
Combustibles No
Organic substance Yes
Notable risks Reacts to heat Reacts with other compouds.

GESAMP Hazard profile

Bioaccumulation in logPow (A1A) 0 - e <1, or > ca.7, or Mol. Wt. > 1000
Bioaccumulation (A1) 0 - No potential to bioaccumulate
Acute aquatic toxicity (B1) (LC/EC/IC50 (mg/l)) 1 - Practically non-toxic
Acute mammalian toxicity by swallowing (C1) (LD50 (mg/kg)) 3 - Moderately high
Acute mammalian toxicity by skin penetration (C2) (LD50 (mg/kg)) 3 - Moderately high
Acute mammalian toxicity by inhalation (C3) (LC50 (mg/l)) 3 - Moderately high
Skin irritation/corrosivity (D1) 1 - Mildly irritating
Eye irritation/corrosivity (D2) 3 - Severely irritating, with irreversible corneal injury
Interference with coastal amenities (E2) D - Dissolver
Effects on wildlife and bottom habitats (E3) 3 - Is highly acutely toxic; and/or is severely irritant or corrosive to skin or eyes; and/or is carcinogenic, mutagenic or reprotoxic; and/or is a floater or persistent floater with associated health effects

Human toxicity threshold

IDHL 2500
Hazard statements
H314 Causes severe skin burns and eye damage.
Precautionary statements
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P303 + P361 + P353 IF ON SKIN (or hair): Remove/Take off immediately all contaminated clothing. Rinse skin with water/shower.
P305 + P351 + P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
TLV-TWA 0.25
TEEL-2 (mg/m3) 500
TEEL-3 (mg/m3) 500


Highest no observed effect concentration (NOEC) on algae (mg/l) 100
Highest no observed effect concentration (NOEC) on crustacean (mg/l) 56
Incident reports

Incident reports

No incident reports available

Emergency Response Guidebook

Emergency Response Guidebook

Guide number: 154

See the guide or download the emergency response guidebook

At sea emergency guide

At sea emergency guide

No guides available

Decision trees

Decision trees

No decision trees available

No additional data

last modified 2020-12-14T09:02:51+00:00