Safety data sheet
According to EC Directive 91/155/EEC
1. Identification of the substance/preparation and of the company/undertaking
Identification of the product
Catalogue No.: 159319
Product name: Sodium hydroxide Reag. Ph Eur

Manufacturer/supplier identification
Company: Merck Ltd.
9th Floor, Monterey Tower, 2170 New Petchburi Road, Bangkapi, Huaykwang, Bangkok 10320
Tel: (662) 308 - 0218

2. Composition/information on ingredients
Caustic soda

CAS-No.: 1310-73-2 EC-Index-No.: 011-002-00-6
Molar mass: 40.00 EINECS-No.: 215-185-5
Molecular formula: HNaO

3. Hazards identification
Causes severe burns.

4. First aid measures
After inhalation: fresh air. Summon doctor.
After skin contact: wash off with plenty of water. Dab with polyethylene glycol 400. Immediately remove contaminated clothing.
After eye contact: rinse out with plenty of water for at least 10 minutes with the eyelid held wide open. Immediately summon eye specialist.
After swallowing: make victim drink plenty of water (if necessary several litres), avoid vomiting (risk of perforation!). Immediately summon doctor. Do not attempt to neutralize.

5. Fire-fighting measures
Suitable extinguishing media:
CO2, powder. Cover with dry sand or cement.

Special risks:
Hydrogen may form upon contact with light metals (danger of explosion!).

Special protective equipment for fire fighting:
Do not stay in dangerous zone without suitable chemical protection clothing and self-contained breathing apparatus.

Other information:
Prevent fire-fighting water from entering surface water or groundwater.

6. Accidental release measures
Person-related precautionary measures:
Avoid generation of dusts; do not inhale dusts.

Environmental-protection measures:
Do not allow to enter sewerage system.

Procedures for cleaning / absorption:
Carefully take up dry. Forward for disposal. Clean up affected area.

Additional notes:
Render harmless: neutralize with dilute sulfuric acid.

7. Handling and storage
No further requirements.

Tightly closed. Dry. Away from acids. Storage temperature: no restrictions.

Requirements for storage rooms and containers:
No aluminium, tin, or zinc containers.

8. Exposure controls/personal protection
Specific control parameter
MAK Germany (max. workplace conc.)
Sodium hydroxide 2 mg/m3

Personal protective equipment:
Respiratory protection: required when dusts are generated.
Eye protection: required
Hand protection: required

Protective clothing should be selected specifically for the working place, depending on concentration and quantity of the hazardous substances handled. The resistance of the protective clothing to chemicals should be ascertained with the respective supplier.
Industrial hygiene: Immediately change contaminated clothing. Apply skin- protective barrier cream. Wash hands and face after working with substance.

9. Physical and chemical properties
Form: solid
Colour: white
Odour: odourless
pH value
at 50 g/l water (20 C) ~ 14
Melting temperature 324 C
Boiling temperature 1390 C
Ignition temperature not available
Flash point not available
Explosion limits lower not available
upper not available
Density (20 C) 2.13 g/cm3
Solubility in water (20 C) 1090 g/l
water (100 C) 3350 g/l

10. Stability and reactivity
Conditions to be avoided
no information available

Substances to be avoided
metals , light metals : Formation of: hydrogen (risk of explosion!) ;
acids , nitriles , alkaline earth metals in powder form , ammonium compounds , cyanides , magnesium , organic nitro compounds , organic combustible substances , phenols and oxidizable substances

Hazardous decomposition products
no information available

Further information

11. Toxicological information
Acute toxicity
Quantitative data on the toxicity of this product are not available.

Subacute to chronic toxicity
An embryotoxic effect need not be feared when the threshold limit value is observed.

Further toxicological information
After inhalation: burns of mucous membranes
After skin contact: Burns.
After eye contact: Burns. Risk of blindness!
After swallowing: irritations of mucous membranes in the mouth, pharynx, oesophagus and gastrointestinal tract. Risk of perforation in the oesophagus and stomach.

Further data
Decomposition of the substance with tissue moisture.
The product should be handled with the care usual when dealing with chemicals.

12. Ecological information
Biologic degradation:
biologically nondegradable

Behavior in environmental compartments:
Evaluation number (FRG) (fish): 3.7 ;

Ecotoxic effects:
Biological effects: Toxic effect on fish and plankton. Harmful effect due to pH shift. Death of fish possible. Does not cause biological oxygen deficit. Neutralization possible in waste water treatment plants.
Fish toxicity: LC50: 189 mg/l (1 N solution = 40 g/l) ; fish EC0: < 20 mg/l ;
aquatic organisms LC50: 10 - 100 mg/l /96 h ;

Further ecologic data:
Do not allow to enter waters, waste water, or soil!

13. Disposal considerations
There are no uniform EC Regulations for the disposal of chemicals or residues. Chemical residues generally count as special waste. The disposal of the latter is regulated in the EC member countries through corresponding laws and regulations. We recommend that you contact either the authorities in charge or approved waste disposal companies which will advise you on how to dispose of special waste.

Disposal in compliance with official regulations. Handle contaminated packaging in the same way as the substance itself. If not officially specified differently, non-contaminated packaging may be treated like household waste or recycled.

14. Transport information
Transport over land ADR/RID and GGVS/GGVE (Germany)
GGVS/GGVE class: 8 Number and letter: 41b
ADR/RID class: 8 Number and letter: 41b
Name of material: 1823 NATRIUMHYDROXID,FEST

River transport ADN/ADNR
not examined

Sea transport IMDG
IMDG class: 8 UN-No.: 1823 Packaging group: II
Ems: 8-06 MFAG: 705
Correct technical name: SODIUM HYDROXIDE,SOLID

Air transport ICAO-TI and IATA-DGR
ICAO/IATA class: 8 UN/ID-No.: 1823 Packaging group: II
Correct technical name: SODIUM HYDROXIDE,SOLID

The transport regulations are cited according to international regulations and in the form applicable in Germany (GGVS/GGVE). Possible national deviations in other countries are not considered.

15. Regulatory information
Labelling according to EC Directives
Symbol: C Corrosive immediately and show this container or label.
R-phrases: R 35 Causes severe burns.
S-phrases: S 26-37/39-45 In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Wear suitable gloves and eye/face protection. In case of accident or if you feel unwell, seek medical advice immediately (show the label where possible).
EC-No.: 215-185-5 EC label

German regulations
Water pollution class 1 (slightly polluting substance)

16. Other information
Reason for alteration
General update.