MDI (Non-Isomer-Specific)CAS 26447-40-5
The CAS number commonly listed on SDSes for technical-grade MDI without isomer characterization.
Toxic Chemical Databases
Substance-specific listings — these flags are for MDI alone, not for the broader family.
Chemical Type
Technical MDI Mixture
Chemical Description
Many SDS documents list MDI under this non-isomer-specific CAS rather than calling out 4,4'-MDI or 2,4'-MDI individually. The chemistry behaves as a representative mix of the MDI family. Regulatory listings (LBC Red List, IARC, NTP, REACH SVHC) capture this CAS to cover technical-grade products of unspecified isomer ratio.
Biological Activity
Severity scores specific to this substance, NOT the parent family average. Differences between siblings are real and meaningful.
Top Health Consequences
- Respiratory sensitization and occupational asthma
- Skin sensitization
- Same MDI-family hazard envelope
Pathways of Exposure
- Inhalation of aerosolized A-side during spray application
- Off-gassing from cured products with residual monomer
- Skin contact with uncured product
Building Materials with MDI
Listed alphabetically — product categories where this specific substance appears.
Polyurethane Adhesives & Sealants
Spray Polyurethane Foam
Two-Part Industrial Coatings
How We Keep MDI Out of a House
MDI is one of the substances our screening is built to catch. A healthy home is won in the specification and the submittal review, long before anyone opens a bucket on site.
If you want a house specified this way from the start, or an existing house assessed for what is already in it, that is the work we do. Earth Bound Homes builds in San Jose, Los Gatos, Santa Clara County and across the San Francisco Bay Area.