Molecular Formula:C₅H₈O₂
Molar mass:100.11582g/mol
Structure:
          
Synonyms :4-Pentanolide;Valerolactone;gamma-Valerolakton;gamma-Pentanolactone;.gamma.-Pentalactone;Pentanolide-1,4;gamma-Valeryllactone;gamma-Valerolactone;gamma-Pentalactone
Appearance:Colorless to pale yellow transparent liquid
Density:1.04 g/cm³                                   
Flash Point:75 °C                    
Boiling Point:206.6 °C at 760 mmHg
Vapour Pressure:0.235 mmHg at 25°C           
Melting point:-31 °C(lit.)
Solubility:Immiscible in water and most organic solvents, resin, wax, etc., do not dissolve in anhydrous glycerin, gum arabic, casein and soy protein.
Water solubility:MISCIBLE
vapor density:3.45 (vs air)

VALEROLACTONE(108-29-2) has strong ability to respond.
VALEROLACTONE(108-29-2) can be used as resins solvents and a variety of  the compounds' intermediates . And also used as lubricants, plasticizers, non-ionic surface active agent of the gelling agent, the inner esters of lead in gasoline additives, used for dyeing cellulose esters and synthetic fibers.

VALEROLACTONE(108-29-2) has been derived by heating acetyl-acetic acid and sulfuric acid.And also can be derived from levulinic acid on the presence of hydrogenation in the nickel, copper or other metal catalysts.

1.		skn-rbt 500 mg/24H MLD		FCTOD7    Food and Chemical Toxicology. 20 (Suppl)(1982),847.
2.		sln-smc 24400 ppm		MUREAV    Mutation Research. 201 (1988),431.
3.		orl-rat LD50:8800 mg/kg		JIHTAB    Journal of Industrial Hygiene and Toxicology. 27 (1945),263.
4.		orl-rbt LD50:2480 mg/kg		JIHTAB    Journal of Industrial Hygiene and Toxicology. 27 (1945),263.

5.    Carcinogenicity:4-VALEROLACTONE(108-29-2)- Not listed as a carcinogen by  NTP, IARC,ACGIH, or CA Prop 65. 
Other: See actual entry in RTECS for complete information.

Reported in EPA TSCA Inventory.

Moderately toxic by ingestion. A skin irritant. Mutation data reported. Combustible liquid when exposed to heat or flame; can react with oxidizing materials. To fight fire, use water, foam, CO₂, dry chemical. When heated to decomposition it emits acrid smoke and irritating fumes.
Hazard Codes:Xi
Risk Statements:
36:  Irritating to the eyes
Safety Statements:
26:  In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
39:  Wear eye/face protection

Stability and Reactivity of 4-VALEROLACTONE(108-29-2):
Conditions to Avoid:Incompatible materials.  
Incompatibilities with Other Materials:Strong oxidizing agents.
Hazardous Decomposition Products: carbon dioxide,carbon monoxide.