Amine Catalysts
The fishy-smelling "B-side" amines that drive polyurethane reactions — and never fully leave.
Toxic Chemical Databases
Where this family lands across the seven independent toxicology authorities we screen against.
Chemical Type
Tertiary & Reactive Amine Catalyst Class
Chemical Description
Tertiary amines are the catalysts that make the polyurethane reaction go. Triethylenediamine (DABCO), DMCHA, DMEA, monoethanolamine, and bis(2-dimethylaminoethyl) ether are the workhorses in every spray foam, rigid insulation board, and one-part urethane sealant. They are not consumed in the reaction — they stay in the cured polymer and migrate out as off-gas for the life of the product. Amine off-gas is the source of the persistent fishy or ammonia smell that occupants report from improperly-installed spray foam, sometimes years after install. EBH treats any residual amine smell as a signal that the foam batch was off-ratio or under-cured, which is itself a sign of much larger isocyanate and polyol problems. We avoid amine-catalyzed polyurethane chemistry in occupied homes.
Chemical Structure
Molecular schematic for Amine Catalysts — formula and structural features shown below.
Biological Activity
Severity scores summarize hazard endpoints from IARC, NTP, EPA IRIS, ATSDR, and NIOSH on a 0–10 scale. Mirrors the system-level output of our SDS Toxic Chemical Screener.
Chemical Analogs and Brand Names
- Triethylenediamine (DABCO / TEDA) — CAS 280-57-9
- N,N-Dimethylcyclohexylamine (DMCHA) — CAS 98-94-2
- N,N-Dimethylethanolamine (DMEA) — CAS 108-01-0
- Monoethanolamine (MEA) — CAS 141-43-5
- Bis(2-dimethylaminoethyl) ether (BDMAEE) — CAS 3033-62-3
- Pentamethyldiethylenetriamine (PMDETA) — CAS 3030-47-5
- C
Top Health Consequences
- Persistent fishy or ammonia smell in interior air
- Respiratory irritation and worsening asthma in sensitive occupants
- Eye and mucous-membrane irritation at sub-ppm levels
- Skin sensitization with direct contact
- Headaches, nausea, and dizziness in chronically exposed occupants
Pathways of Exposure
- Off-gassing from cured spray polyurethane foam (residual amine release)
- Inhalation during foam installation and trimming
- Off-gassing from one-part urethane sealant beads
- Re-volatilization in summer when interior temperatures rise
Building Materials with Amine Catalysts
Listed alphabetically. These are the product categories where this chemistry most often shows up — not an exhaustive list.
Carpet Backing (Urethane)
Engineered Wood Adhesives
Flexible Polyurethane Foam Cushions
One-Part Urethane Sealants
Polyiso Rigid Insulation Board
Polyurethane Wood Floor Finish
Spray Polyurethane Foam Insulation
Structural Insulated Panels (SIPs)
Two-Part Urethane Industrial Coatings
Urethane Pour-In-Place Roof Insulation