SODIUM HYDROXIDE solutions (33%)

UN Number: 1824 - CAS Number: 1310-73-2

Also known as: CAUSTIC SODA

Information on chemical

External resources

CAMEO Chemical Database
WISER Substance List

Description

UN number	1824
CAS number	1310-73-2

Physical chemical data

Physical State (20°C)

Liquid

Density (kg/m3)

1480 [Kg/m³] at a temperature of 20°C

Molar mass (g/mol)

Density of gas (kg/m3)

1.78

Boiling Point (°C)

140

Vapour Pressure (Pa)

900 [Pa] at a temperature of 20°C

Behaviour at sea

Additional data

Colour	colourless
Odour	odourless

Transportation data

Transport mode	Bulk,Packaged
Package group	II/III
State	liquid
Family name	caustics

Reactivity data

Water	Yes
Acid(s)	Yes
Base(s)	No
Metal(s) and alloys	Yes
Oxidizing agents	Yes
Combustibles	Yes
Organic substance	Yes

GESAMP Hazard profile

Bioaccumulation in BCF (A1B)	0 - No measurable BCF
Bioaccumulation (A1)	0 - No potential to bioaccumulate
Acute aquatic toxicity (B1) (LC/EC/IC50 (mg/l))	2 - Slightly toxic
Acute mammalian toxicity by swallowing (C1) (LD50 (mg/kg))	1 - Slight
Acute mammalian toxicity by skin penetration (C2) (LD50 (mg/kg))	1 - Slight
Acute mammalian toxicity by inhalation (C3) (LC50 (mg/l))	3 - Moderately high
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	250
ERPG-1 (ppm)	0.5
ERPG-3 (ppm)	50

Ecotoxicity

Incident reports

Year	Vessel	Location	Cargo type
1984	Puerto Rican	San Francisco Bay, USA	Bulk
19??	Stanislaw Dubois	Off Island Texel, Netherlands	Package

Emergency Response Guidebook

Guide number: 154

See the guide or download the emergency response guidebook

At sea emergency guide

Emergency schedule: 8-06

CORROSIVE SUBSTANCES, NON-COMBUSTIBLE.

Emergency procedures

Spillage on deck

Use of water on substance may cause violent reaction. Wash overboard with copious quantities of water from as far away as practicable.

Spillage under deck

Collect spillage, where practicable, using inert absorbent material for liquids, for safe disposal.

Fire on deck

If possible remove receptacles likely to be involved or keep them cool with water.

Fire under deck

Adopt action as for "On deck".

Special equipment to be carried

Protective clothing (gloves, boots, coveralls, headgear).
Self-contained breathing apparatus.
Inert absorbent material (e.g. diatomaceous earth)
Spray nozzles.

Remarks by UN no.

ALUMINIUM BROMIDE, ANHYDROUS (UN No. 1725)
ALUMINIUM CHLORIDE, ANHYDROUS (UN No. 1726)
HYDROGENDIFLUORIDES, N.O.S. (UN No. 1740)
DIFLUOROPHOSPHORIC ACID, ANHYDROUS (UN No. 1768)
FLUOROBORIC ACID (UN No. 1775)
FLUOROPHOSPHORIC ACID, ANHYDROUS (UN No. 1776)
FLUOROSILICIC ACID (UN No. 1778)
HEXAFLUOROPHOSPHORIC ACID (UN No. 1782)
SULPHUR TRIOXIDE, INHIBITED (UN No. 1829)
SULPHURIC ACID, FUMING (UN No. 1831)
ZINC CHLORIDE, ANHYDROUS (UN No. 2331)
VANADIUM TRICHLORIDE (UN No. 2475)
ZIRCONIUM TETRACHLORIDE (UN No. 2503)
CYANURIC CHLORIDE (UN No. 2670)
AMMONIA SOLUTION (UN No. 2672), with more than 10% but not more than 35%
ammonia, by mass.
PHOSPHORUS PENTABROMIDE (UN No. 2691)
Turn ship off-wind.

Decision trees

No decision trees available

No additional data