Page 1 of 5

 Safety Data Sheet 

Revised Date: 20 February 2015

1. IDENTIFICATION OF THE SUBSTANCE/PREPARATION AND COMPANY 

/UNDERTAKING 

Product Name : DENKA CSA #20 

General Use : Special expansive hydraulic binder for cement base materials 

Manufacturer: 

DENKI KAGAKU KOGYO KABUSHIKI KAISHA 

SPECIAL CEMENT INTERNATIONAL DEPT. 

Nihonbashi Mitsui Tower, 1-1, Nihonbashi-Muromachi 2-Chome, Chuo-Ku Tokyo 103-8338, JAPAN 

Tel : + 81-3-5290-5365 

Fax : + 81-3-5290-5085 

OMI PLANT, Niigata Pref. JAPAN Tel : + 81-255-62-6302

 Fax : + 81-255-62-6327 

 

Emergency telephone number : see : Manufacturer / Supplier 

E-mail contact: dk010313@denka.co.jp

2. HAZARDS IDENTIFICATION 

Classification : Skin Corrosion/Irritation Category 1C H314 

 Serious Eye Damage Category 1 H318 

 Specific target organ toxicity-single exposure Category 3(Respiratory irritation) H335 

 

Signal word : Danger 

Health Effects : The product is a severe eye irritant, and may cause loss of sight, because of strong 

alkalinity. It is irritating to skin, especially if the skin is moist. Exposure to dust 

may cause respiratory irritation. Ingestion may cause gastrointestinal irritation.

Environmental Effects : Not classified as harmful, but may cause environmental effects to 

alkalinity. 
 

Page 2 of 5

Physico-chemical effects: Reacts with water producing heat. Solution produced is highly alkaline. 

3. COMPOSITION/INFORMATION ON INGREDIENTS 

 Single product / Compound:Compound

Chemical Name CAS No. % EINECS No. Classification 

Calcium Sulfoaluminate 12005-25-3 25-35 

Calcium Sulfate,Gypsum 7778-18-9 45-55 231-900-3 -

Calcium Oxide 1305-78-8 15-25 215-138-9 H314,H318 

 

4. FIRST-AID MEASURES 

Eye Contact : Speed is essential. Do not rub eyes. Immediately rinse eyes with plenty of fresh 

water for at least 15 minutes and consult a doctor. 

Inhalation : Remove from exposure to fresh air immediately. If breathing is difficult, give oxygen 

and consult a doctor.

 Skin Contact : Immediately wash contaminated area with fresh water. Consult medical treatment 

if irritation or inflammation develops or persists. Launder contaminated clothing 

before re-use. 

 Ingestion : Rinse mouth thoroughly with fresh water. Immediately consult a doctor.

5. FIRE-FIGHTING MEASURES 

Fire and explosive properties The product is not flammable, and will not form explosive dust 

clouds. 

Extinguishing media Not applicable 

Specific hazards The dust may form irritating atmosphere. The product will react 

exothermically with water. Contaminated water will be strongly 

alkaline. 

Protective equipment for fire fighters 

Fire fighters should wear an approved self-contained breathing 

apparatus and full protective clothing. 

6. ACCIDENTAL RELEASE MEASURES 

Personal precautions : Use proper personal protective equipment as indicated in section 8. 

Cleaning methods : Collect the product into suitable containers avoiding dust formation. 

 Environmental precautions : Do not let this product enter the environment.

7. HANDLING AND STORAGE 

Handling : Use with adequate ventilation and local exhaust. Minimize dust generation and 

accumulation. Use proper personal protective equipment as indicated in section 8. 

Storage : Keep in a cool, dry place. 
 

Page 3 of 5

8. EXPOSURE CONTROLS/PERSONAL PROTECTION 

Occupational Exposure Limits 

EU Occupational exposure limits (IOELVs): None

UK Occupational exposure limits (WELs): Calcium oxide (8 h TWA): 2 mg/m3

. 

Gypsum (8 h TWA): inhalable dust, 10 mg/m3

; respirable 

dust 4 mg/m3

.

Engineering Controls : Use adequate ventilation and local exhaust to keep airborne concentration 

low. Maintain eye-rinse fountains and quick-drench shower facilities in 

work area. 

Personal Protection: The need for personal protective equipment should be based on a workplace 

risk assessment for the particular use. PPE should be to European (EN) 

standards. 

Respiratory protection : In case of brief exposure or low pollution use filter respirator. 

In case of intensive or longer exposure, use self-contained breathing 

protection. 

Hand protection : Protective gloves – e.g. nitrile rubber, NBR gloves. Consult manufacturer 

concerning breakthrough times. 

 Eye protection : Safety spectacles with side shields or goggles with full face shield. 

 Skin and body protection : Where more extensive contact may occur, wear suitable protective 

clothing (eg apron, sleeves, boots). 

9. PHYSICAL AND CHEMICAL PROPERTIES 

Physical State : Solid 

Appearance : White powder

Odour : Odourless 

pH : Dissolved product is alkaline. The pH value becomes 11-13.

Melting Point : Not applicable

Boiling Point : Not available 

Flammability: Non-flammable 

Vapour Pressure : Not applicable 

Relative Gravity : 2.90 – 2.96 g/cm3 at 20 degree Celsius 

Water solubility : Partially soluble in water. Will solidify over a period of hours if moistened or 

wet.

10. STABILITY AND REACTIVITY 

General : Product is stable. Keep dry until use. 

Incompatible material and Conditions to Avoid : Strong acids. 

Hazardous decomposition : Reaction with strong acids generates toxic gases (e.g. sulfur oxide(s)).

11. TOXICOLOGICAL INFORMATION 
 

Page 4 of 5

The preparation has not been tested for toxicological effects, but it is classified as a skin and eye 

irritant on the basis of the known hazards of the components.

Acute toxicity No components are classified as harmful. Not expected to cause 

systemic effects through skin contact. 

Corrosivity/irritation Expected to be a severe eye irritant, and irritating to skin. Dusts may 

irritate respiratory system. One component is expected to product 

highly alkaline solutions in water. Repeated or prolonged skin contact 

may cause irritation progressing to a burn. 

Sensitisation No ingredient has been identified as having sensitising properties. 

Repeated-dose toxicity/mutagenicity/carcinogenicity/reproductive and developmental toxicity 

No information available. 

12. ECOLOGICAL INFORMATION 

Ecotoxicological data have not been determined specifically for this product, but it is not expected to 

be classified as toxic to aquatic organisms on the basis of the known hazards of the components.

Mobility The product is partially soluble in water and expected to have a low vapour pressure. 

Persistence/degradability Not applicable to inorganic product. 

Bioaccumulation Not applicable to inorganic product. 

Toxicity Not expected to be toxic to aquatic organisms, but may cause harmful changes in pH 

(high alkalinity) in water. 

13. DISPOSAL CONSIDERATIONS

This product may be suitable for disposal by landfill. Some reduction of hazard can be effected by 

careful neutralisation with dilute acid. Disposal must be in accordance with current national and local 

regulations. Chemical residues generally count as special waste, and their disposal may be regulated in 

the EC member countries through corresponding laws and regulations. We recommend that you 

contact either the authorities or approved waste disposal companies who will advise you on how to 

dispose of special waste. 

General EU requirements are given in the Waste Framework Directive (75/442/EEC) and the 

Hazardous Waste Directive (91/689/EEC). 

Packaging may contain residues of the product and should be treated accordingly. 

 European Waste Catalogue (EWC) : 17 08 02 gypsum-based construction materials other than 

mentioned in 17 08 01

14. TRANSPORT INFORMATION 

Transport by road/rail (ADR/RID) : Not regulated

Maritime transport (IMDG code) : Not regulated 

 Inland navigation (ADNR) : Not regulated 

 Air transport (ICAO/IATA) : Not regurated 

This product is not classed as a dangerous good in any transport regulation. 
 

Page 5 of 5

15. REGULATORY INFORMATION 

European/International Regulations 

European Labeling in Accordance with EC Directives 

Hazard symbol : Xi. 

Risk phrases : 

 R36/38, irritating to eyes and skin 

R41, risk of serious damage to eyes 

Safety phrases : 

S25 Avoid contact with eyes 

S26 In case of contact with eyes, rinse immediately with plenty of water and seek medical 

advice 

 S37/39 Wear suitable gloves and eye/face protection 

EU legislation: 

Dangerous Substances Directive (67/548/EEC) 

Dangerous Preparations Directive (99/45/EC) 

REACH Regulation (1907/2006) 

Chemical Agents Directive (98/24/EC) 

Personal Protective Equipment (EC Directive) Regulations SI 1992/3139. 

Guidance: 

Approved Classification and Labelling Guide (Fifth Edition). 

Approved Supply List. Information approved for the classification and labelling of substances and 

preparations dangerous for supply. 

COSHH Essentials: Easy steps to chemical control (http://www.coshh-essentials.org.uk/). 

Occupational Exposure Limits EH40. 

16. OTHER INFORMATION 

The information above is believed to be accurate and represents the best information currently 

 available to us. However, we make no warranty of merchantability or any other warranty, 

 express or implied, with respect to such information, and we assume no liability resulting from 

 its use. Users should make their own investigations to determine the suitability of the information 

 for their particular purposes. In no way shall the company be liable for any claims, losses, 

 or damages of any third party or for lost profits or any special, indirect, incidental, 

consequential or exemplary damages, howsoever arising, even if the company has been 

advised of the possibility of such damages. 

SDS Revised Date: 20 February 2015