MATERIAL SAFETY DATA SHEET
Thiourea Dioxide
Company: BEST INC., LIMITED.
Add.: Rooms 1318-20, 13/F Hollywood Plaza, 610 Nathan Road, Mongkok, Kowloon, Hong Kong
Tel: +852-30774337 Fax:+852-30774338
1. IDENTIFICATION
General
Product Name : THIOUREA DIOXIDE
Other Names : FORMAMIDINESULFINIC ACID AMINOIMINOMETHANE SULFINIC ACID
UN No. : 3341
Dangerous Goods Class : 4.2
Subsidiary Risk : None Allocated
Hazchem Code : N/A
Pack Group : II
EPG : 25
Poisons Schedule : N/A
Uses :
This material is a reducing agent used primarily in the production of bleached recycled pulp. However, being a reducing agent, it is also effective in the bleaching of stone groundwood, pressurised groundwood.
1.1 Physical Description / Properties
Appearance : White granular solid, yellowing and caking with time.
Formula : CH4N2O2S
Boiling Point : DEC deg C
Melting Point : N/A deg C
Vapour Pressure : N/A
Specific Gravity : 1.71 (water = 1)
Flash Point : N/A
pH : 4 (1% solution)
Solubility in water : 30 g/l (25 deg C)
Flammability Limits (as percentage volume in air)
Lower Explosion Limit : N/A
Upper Explosion Limit : N/A
1.2 Other Properties
Decomposes above 110 deg C.
1.3 Ingredients
|
Chemical Entity |
CAS No. |
Proportions (%) |
|
FORMAMIDINESULFINIC ACID |
[ 1758-73-2] |
> 99 |
|
THIOUREA |
[ 62-56-6] |
< 0.1 |
|
|
|
|
2. HEALTH HAZARD INFORMATION
2.1 Health Effects - Acute
Swallowed
No data available
Eye
A mild eye irritant.
Skin
Not a skin irritant.
Inhaled
Inhalation of dust may result in respiratory irritation.
2.2 Health Effects - Chronic
No data found.
2.3 First Aid
Swallowed
If swallowed, seek medical attention immediately.
Eye
Irrigate with copious quantities of water for 15 minutes. In all cases of eye contamination it is a sensible precaution to seek medical advice.
Skin
Wash contaminated skin with plenty of soap and water. If irritation occurs, seek medical advice.
Inhaled
Remove victim from exposure - avoid becoming casualty. Seek medical advice if effects persist.
First Aid Facilities
Ensure an eye bath and safety shower are available and ready for use.
2.5 Advice to Doctor
Treat symptomatically based on judgement of doctor and individual reactions of patient.
2.6 Toxicity Data
Oral LD50 = not available Dermal LD50 = not available Inhalation LC50 = not available
3. PRECAUTIONS FOR USE
3.1 Exposure Standards
No value assigned for this material by Worksafe , however the following is recommended for nuisance dusts : TWA 10 mg/m3.
3.2 Engineering Controls
Ensure adequate ventilation to maintain exposure levels below standard.
3.3 Personal Protection
Avoid eye and repeated or prolonged skin contact, and inhalation of dust. Wear overalls, safety glasses and impervious gloves. Available information suggests that gloves made from rubber should be suitable for intermittent contact. However due to variations in glove construction and local conditions, a final assessment should be made by the user. If dust exists, wear dust mask meeting the requirements of AS1715 and AS1716. Always wash hands before smoking, eating, drinking or using the toilet.
3.4 Flammability
Non combustible material.
SAFE HANDLING INFORMATION
4.1 Storage / Transport
Not defined as a Dangerous Good by the n Code for the Transport of Dangerous Goods by Road and Rail. Store in a cool (below 30 deg C), dry area out of direct sunlight. Store away from oxidising agents. Do not add to hot materials; do not grind or subject to frictional heat or shock - explosive decomposition may result.
4.2 Packaging / Labelling
UN No. 3341
Class 4.2
Sub Risk None Allocated
Hazchem Code N/A
Pack Group II
EPG No. 25
Shipping Name THIOUREA DIOXIDE
Hazard HARMFUL
Risk Phrases
R22 Harmful if swallowed.
R36/37/38 Irritating to eyes, respiratory system and skin.
Safety Phrases
S24/25 Avoid contact with skin and eyes.
4.3 Spills and Disposal
Spills
Wear protective equipment to prevent skin and eye contamination and inhalation of dust.
Contain spill. Sweep up but avoid generating dust. Collect and seal in properly labelled containers for disposal.
Disposal
Dispose of in accordance with all Local, State and Federal regulations at an approved waste disposal facility.
4.4 FIRE AND EXPLOSION HAZARD
Fire / Explosion
Not combustible. If involved in a fire, can decompose generating sulphur dioxide, ammonia, and sulfinic acid. Incompatible with oxidising agents, water and heavy metals. Material is shock sensitive and potentially explosive. Hazardous decomposition products include carbon dioxide and probably carbon monoxide. Oxides of nitrogen and sulphur may also be present. Hazardous polymerisation will not occur.
Extinguishing Media
Fire fighters should wear self-contained breathing apparatus if risk of exposure to products of decomposition. Use water spray, dry chemical or carbon dioxide. Use equipment/media appropriate to surrounding fire conditions.
