SODIUM HYDROXIDE solid

UN Number: 1823 - CAS Number: 1310-73-2

Also known as: CAUSTIC SODA, Lye, Soda Lye, Sodium Hydrate, White Caustic, Sodium Hydroxide Solution, Caustic Soda Solution, Sodium Hydroxide (Na(Oh)), Sodium Hydrate Solution, Sodium Hydroxide Solid, Caustic Soda Solid, Sodium Hydrate Solid, Sodium Hydroxide, Sodium Hydroxide Solution (40%), Solution D'Hydroxyde De Sodium (40%)

Information on chemical

External resources

CAMEO Chemical Database
WISER Substance List

Description

UN number	1823
CAS number	1310-73-2
Formula	NaOH

Physical chemical data

Physical State (20°C)

Solid

Physical State (25°C)

Liquid

Density (kg/m3)

2100 [Kg/m³] at a temperature of 20°C

Kinematic viscosity (cSt)

25.35 [cSt] at a temperature of 20°C

Molar mass (g/mol)

Solubility (g/L)

10000000 [g/L] at a temperature of 20°C and salinity of 0‰

Boiling Point (°C)

1390

Melting Point (°C)

318

Behaviour at sea

Additional data

Colour

white

Odour

rotten egg odour

MARPOL pollution category

Category	Description
Y	Noxious Liquid Substances which, if discharged into the sea from tank cleaning or deballasting operations, are deemed to present a hazard to either marine resources or human health or cause harm to amenities or other legitimate uses of the sea and therefore justify a limitation on the quality and quantity of the discharge into the marine environment.

Transportation data

Package group	II
State	solid
Temperature (°C)	ambient
Pressure (Pa)	ambient

Reactivity data

Water	No
Abilities	Solution.
Acid(s)	No
Base(s)	No
Metal(s) and alloys	Yes
Oxidizing agents	No
Reducing agents	No
Combustibles	No
Organic substance	No
Notable risks	Reacts with many compounds.

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
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

150

Hazard statements

Physical

H290	May be corrosive to metals.

Health

H314	Causes severe skin burns and eye damage.
H315	Causes skin irritation.
H319	Causes serious eye irritation.

Precautionary statements

Prevention

P260	Do not breathe dust/fume/gas/mist/vapours/spray.
P280	Wear protective gloves/protective clothing/eye protection/face protection.

Response

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.
P310	Immediately call a POISON CENTER or doctor/physician.

TLV-TWA

1.2

ERPG-1 (ppm)

0.5 mg

ERPG-2 (ppm)

5 mg

ERPG-3 (ppm)

50 mg

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

Corrosive

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No decision trees available

No additional data