Isocyanate Monitoring
MDI, TDI, and HDI exposure assessment for spray painting and foam operations
What Is Isocyanate Monitoring?
Isocyanate monitoring measures worker exposure to reactive compounds (MDI, TDI, HDI) used in polyurethane paints, foams, adhesives, and coatings. Isocyanates are the leading cause of occupational asthma in Australia, with sensitisation potentially occurring at very low concentrations.
The WES of 0.005 mg/m³ (as NCO) TWA-8h applies to all isocyanate species. Once sensitised, a worker may react to exposures well below the standard. Monitoring is critical in spray painting, foam manufacturing, and adhesive application operations.
How Is It Done?
Personal sampling using treated glass fibre filters (1-(2-methoxyphenyl)piperazine reagent). Analysis by HPLC-UV (NIOSH 5522 / MDHS 25/4).
When You Need This
- +Two-pack polyurethane spray painting
- +Polyurethane foam manufacturing or application
- +Adhesive and sealant operations using isocyanate products
- +Worker reports of respiratory symptoms or sensitisation
- +Spray booth or LEV performance verification
Relevant Standards
Common Industries
Related Monitoring
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