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Urethane

CAS No.: 51-79-6
Formula: C3H7NO2
Molecular Weight: 89.09
Suppliers: All(0) China Suppliers(0) Products(22)
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  • Basic Info
  • Safety Info
  • MSDS
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What is Urethane

**Introduction to Urethane** Urethane, also known as polyurethane, is a versatile synthetic polymer widely used in industries due to its durability, flexibility, and resistance to abrasion, chemicals, and weather. It is formed through a reaction between polyols and diisocyanates, resulting in materials that can be tailored for various applications—from soft foams in mattresses and insulation to rigid components in automotive parts and construction. Urethane’s exceptional load-bearing capacity, shock absorption, and thermal stability make it ideal for coatings, adhesives, sealants, and elastomers. Its adaptability allows for customization in hardness, density, and elasticity, ensuring optimal performance across medical, industrial, and consumer goods sectors.

Preparation Process: Urethane (ethyl carbamate) can be prepared by reacting urea with ethanol in the presence of nitrous acid or its derivatives. A common method involves the reaction of urea with ethyl nitrite in an acidic medium: 1. Dissolve urea in ethanol and cool the mixture. 2. Slowly add sodium nitrite solution while maintaining a temperature below 10°C. 3. Acidify the mixture with dilute sulfuric acid to generate nitrous acid in situ, which reacts with urea to form urethane. 4. Stir the mixture for several hours, then neutralize with a base. 5. Extract urethane with a solvent (e.g., ether) and purify by recrystallization from water or ethanol. Yield and purity depend on reaction conditions.

Usage Scenarios: Urethane, also known as ethyl carbamate, is primarily used in industrial and chemical applications. It serves as an intermediate in the production of pharmaceuticals, pesticides, and cosmetics. In the polymer industry, urethane is a key component in polyurethane foams, adhesives, coatings, and elastomers, offering durability and flexibility. It is also used in medical research as an anesthetic for laboratory animals. Additionally, urethane finds applications in the textile industry for fabric finishes and as a cross-linking agent in resins. Despite its utility, its use is regulated due to carcinogenic properties, limiting exposure in consumer products.

Urethane Basic Info
Chemical Name Urethane
Synonyms ETHYL CARBAMATE;Uretan;Urethan;Estane 5703;rethane;ethylurethan;ETHYLURETHANE;CARBAMIC ACID ETHYL ESTER;ETHYL CARBAMATE (URETHANE);x41
CAS No. 51-79-6
Molecular Formula C3H7NO2
Molecular Weight 89.09
PSA 52.32000
LogP 0.80190
Safely Info
RTECS FA8400000
Hazard Class -
Safety Statements 53-45-99
HS Code 29241990
WGK Germany 3
Packing Group -
RIDADR UN 3077 9 / PGIII
Risk Statements 45-22
Hazard Codes T
Caution Statement P201-P301+P312+P330-P308+P313
Hazard Declaration H302-H350
Symbol GHS07,GHS08
Signal Word Danger
Urethane Price
Here is a rough price range for the chemical product "urethane" (polyurethane) in the listed countries. Note that prices can vary significantly based on type, grade, and market conditions:

1. **United States**: $2.50 - $5.00 per kg
2. **China**: $1.50 - $3.50 per kg
3. **Russia**: $2.00 - $4.00 per kg
4. **Germany**: $2.50 - $5.50 per kg
5. **India**: $1.80 - $3.80 per kg
6. **Japan**: $3.00 - $6.00 per kg
7. **Brazil**: $2.20 - $4.50 per kg
8. **South Korea**: $2.50 - $5.00 per kg
9. **Philippines**: $2.00 - $4.50 per kg
10. **United Kingdom**: $2.80 - $5.50 per kg
11. **France**: $2.70 - $5.20 per kg
12. **Mexico**: $2.00 - $4.00 per kg
13. **Canada**: $2.50 - $5.00 per kg
14. **South Africa**: $2.20 - $4.50 per kg
15. **Egypt**: No results
16. **Turkey**: $2.00 - $4.00 per kg
17. **Thailand**: $1.80 - $3.80 per kg
18. **Indonesia**: $1.70 - $3.50 per kg

Prices are approximate and subject to change based on market conditions, quality, and supplier.
MSDS
MSDS
Name: Urethane 97% Material Safety Data Sheet
Synonym: Ethyl carbamat
CAS: 51-79-6
Section 1 - Chemical Product   MSDS Name:Urethane 97% Material Safety Data Sheet
Synonym:Ethyl carbamat

Section 2 - COMPOSITION, INFORMATION ON INGREDIENTS
CAS# Chemical Name content EINECS#
51-79-6 Urethane 97% 200-123-1
Hazard Symbols: XN
Risk Phrases: 45

Section 3 - HAZARDS IDENTIFICATION
  EMERGENCY OVERVIEW
May cause cancer.
Potential Health Effects
Eye:
Causes eye irritation. May cause chemical conjunctivitis.
Skin:
Causes skin irritation. Substance is readily absorbed through the skin.
Ingestion:
May cause irritation of the digestive tract. May cause gastrointestinal irritation with nausea, vomiting and diarrhea. May cause liver and kidney damage. May cause central nervous system depression. May cause bone marrow depression and possible focal degeneration of the brain.
Inhalation:
Causes respiratory tract irritation. Inhalation at high concentrations may cause CNS depression and asphixiation. May cause acute pulmonary edema, asphyxia, chemical pneumonitis, and upper airway obstruction caused by edema.
Chronic:
Possible cancer hazard based on tests with laboratory animals.

Section 4 - FIRST AID MEASURES
  Eyes: Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately.
Skin:
Get medical aid. Immediately flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes.
Ingestion:
If victim is conscious and alert, give 2-4 cupfuls of milk or water.
Never give anything by mouth to an unconscious person. Get medical aid immediately.
Inhalation:
Remove from exposure and move to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
Notes to Physician:

Section 5 - FIRE FIGHTING MEASURES
  General Information:
As in any fire, wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion. Dusts may be combustible when exposed to heat, flame, or oxidizing agents. May be ignited by heat, sparks, and flame. Containers may explode when heated.
Extinguishing Media:
In case of fire, use water, dry chemical, chemical foam, or alcohol-resistant foam. Use water spray to cool fire-exposed containers. Cool containers with flooding quantities of water until well after fire is out.

Section 6 - ACCIDENTAL RELEASE MEASURES
  General Information: Use proper personal protective equipment as indicated in Section 8.
Spills/Leaks:
Clean up spills immediately, observing precautions in the Protective Equipment section. Sweep up, then place into a suitable container for disposal. Avoid generating dusty conditions. Remove all sources of ignition. Provide ventilation.

Section 7 - HANDLING and STORAGE
  Handling:
Wash thoroughly after handling. Remove contaminated clothing and wash before reuse. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Empty containers retain product residue, (liquid and/or vapor), and can be dangerous. Keep container tightly closed. Keep away from heat, sparks and flame.
Avoid ingestion and inhalation. Use only in a chemical fume hood. Do not pressurize, cut, weld, braze, solder, drill, grind, or expose empty containers to heat, sparks or open flames.
Storage:
Keep away from sources of ignition. Store in a tightly closed container. Store in a cool, dry, well-ventilated area away from incompatible substances.

Section 8 - EXPOSURE CONTROLS, PERSONAL PROTECTION
  Engineering Controls:
Facilities storing or utilizing this material should be equipped with an eyewash facility and a safety shower. Use adequate ventilation to keep airborne concentrations low. Use only under a chemical fume hood.
Exposure Limits CAS# 51-79-6: Personal Protective Equipment Eyes: Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166.
Skin:
Wear appropriate protective gloves to prevent skin exposure.
Clothing:
Wear appropriate protective clothing to prevent skin exposure.
Respirators:
Follow the OSHA respirator regulations found in 29 CFR 1910.134 or European Standard EN 149. Use a NIOSH/MSHA or European Standard EN 149 approved respirator if exposure limits are exceeded or if irritation or other symptoms are experienced.

Section 9 - PHYSICAL AND CHEMICAL PROPERTIES
 
Physical State: Crystalline powder
Color: white
Odor: Not available.
pH: Not available.
Vapor Pressure: Not available.
Viscosity: Not available.
Boiling Point: 182 - 184 deg C @ 7
Freezing/Melting Point: 47 - 51 deg C
Autoignition Temperature: Not available.
Flash Point: 92 deg C ( 197.60 deg F)
Explosion Limits, lower: Not available.
Explosion Limits, upper: Not available.
Decomposition Temperature:
Solubility in water: slightly soluble in olive oil
Specific Gravity/Density:
Molecular Formula: H2NCO2C2H5
Molecular Weight: 89.09

Section 10 - STABILITY AND REACTIVITY
  Chemical Stability:
Stable under normal temperatures and pressures.
Conditions to Avoid:
Incompatible materials, dust generation, excess heat, strong oxidants.
Incompatibilities with Other Materials:
Acids, antipyrine, chloral hydrate, salol, thymol.
Hazardous Decomposition Products:
Nitrogen oxides, carbon monoxide, carbon dioxide, nitrogen.
Hazardous Polymerization: Will not occur.

Section 11 - TOXICOLOGICAL INFORMATION
  RTECS#:
CAS# 51-79-6: FA8400000 LD50/LC50:
CAS# 51-79-6: Oral, mouse: LD50 = 2500 mg/kg; Oral, rat: LD50 = 1809 mg/kg.
Carcinogenicity:
Urethane - California: carcinogen, initial date 1/1/88 NTP: Suspect carcinogen IARC: Group 2B carcinogen Other:
See actual entry in RTECS for complete information.

Section 12 - ECOLOGICAL INFORMATION
  Other No information available.

Section 13 - DISPOSAL CONSIDERATIONS
  Dispose of in a manner consistent with federal, state, and local regulations.

Section 14 - TRANSPORT INFORMATION
 
IATA
No information available.
IMO
No information available.
RID/ADR
No information available.
USA RQ: CAS# 51-79-6: 100 lb final RQ; 45.4 kg final RQ

Section 15 - REGULATORY INFORMATION
 
European/International Regulations
European Labeling in Accordance with EC Directives
Hazard Symbols: XN
Risk Phrases:
R 45 May cause cancer.
Safety Phrases:
S 53 Avoid exposure - obtain special instructions
before use.
S 45 In case of accident or if you feel unwell, seek
medical advice immediately (show the label where
possible).
WGK (Water Danger/Protection)
CAS# 51-79-6: 1
Canada
CAS# 51-79-6 is listed on Canada's DSL List.
CAS# 51-79-6 is listed on Canada's Ingredient Disclosure List.
US FEDERAL
TSCA
CAS# 51-79-6 is listed on the TSCA inventory.


SECTION 16 - ADDITIONAL INFORMATION
N/A
SDS 1.0
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