TDI (Toluene Diisocyanate)

Basic Identification Attributes
Chemical Name (IUPAC): 2,4-Toluene diisocyanate (major), 2,6-Toluene diisocyanate (minor)

Common/Trade Name: TDI

CAS Number: 26471-62-5 (mixture of isomers)

HS Code: 2916.32.00

Synonyms: Tolylene diisocyanate, toluene-2,4-diisocyanate, Toluene-2,6-diisocyanate

Physical & Chemical Properties
Physical State: Colorless to pale yellow liquid

Color & Odor: Pungent, sharp odor

Boiling Point: Approx. 127 °C

Solubility: Slightly soluble in water (hydrolyzes); soluble in organic solvents

Density: Approx. 1.21 g/cm³

Safety & Hazard Attributes
GHS Classification: Toxic, irritant, respiratory sensitizer

Toxicity: High toxicity by inhalation and skin contact; potential to cause occupational asthma

Exposure Limits: Strict occupational exposure limits established (e.g., OSHA PEL: 0.02 ppm)

Storage & Handling Attributes
Storage Conditions: Store in tightly closed containers in a cool, dry, well-ventilated area away from moisture and heat

Container Type: Steel drums or specialized chemical containers

Shelf Life: Typically 6–12 months under proper conditions

Handling Precautions: Use full PPE; avoid inhalation and skin contact; ensure adequate ventilation and use closed systems

Regulatory & Compliance Attributes
Regulated under OSHA, REACH, EPA, and other international chemical safety standards

Classified as hazardous substance with strict handling and transport regulations

Complies with UN classification for dangerous goods

Environmental & Health Impact
Biodegradability: Does not readily biodegrade; hydrolyzes in water to less harmful products

Ecotoxicity: Harmful to aquatic life; avoid environmental release

Bioaccumulation: Not significant