Page:NIOSH Manual of Analytical Methods - 5525.pdf/14

 ISOCYANAT ES, TOTA L (MAP): METHO D 5525, Issue 1, dated 15 March 2003 - Page 14 of 17 TABLE 3. EXAMPLES OF EXPOSU RE SCENERIOS AND WH ICH SAMPLER TO CH OOSE Sam pling Section in Method

Sam pler

Ex posure Sc enario

GFF: 0.1 mg MAP/cm 2

1

Vapor only (e.g., flexible foam m anufacture using TD I mon om er) Aerosols of aliphatic isocyanates (e.g., autobody refinishing using HDI- and IPDI-based polyisocyanates) Aerosols of arom atic isocyanates <2 µ m (e.g., con den sation aero sol fro m hea ting M DI)

Impinger: 1x10 -4 M MAP in butyl benzoate (2.76 mg MAP per 100 mL)

2

Aerosols of arom atic isocyanates >2 µ m (e.g., spraying of MDI polyisocyanate or cutting partially-cured MD I-bas ed p rodu ct)

Impinger + GFF: MAP impinger followed by MAP on GFF

3

Aerosols of aromatic isocyanates both <2 µm and >2 µm (m ixture of mechanically generated aerosol and condensation aerosol, e.g., heating and cutting partially-cu red M DI-b ase d pro duc t)

NIOSH Manual of Analytical Methods (NMAM), Fourth Edition