Respirators for Spray Painting and Isocyanates

The exposure limits

What the federal rule says

Each entry is condensed from the paragraph cited; the paragraph itself is the rule and the link opens it.

29 CFR 1910.94(c)(6)(iii)(a) (spray finishing): When an operator is in a booth downstream from the object being sprayed, an air-supplied respirator or other type of respirator must be used by employees that has been approved by NIOSH under 42 CFR part 84 for the material being sprayed.

29 CFR 1910.134(d)(3)(iii)(B): Where a cartridge change schedule is used, the employer must implement a change schedule for canisters and cartridges that is based on objective information or data that will ensure that canisters and cartridges are changed before the end of their service life.

Source: 29 CFR, Occupational Safety and Health Standards, as published by OSHA (ecfr.gov / osha.gov), read Nov 2–3 2026.

California (Cal/OSHA)

Each entry is condensed from the paragraph cited; the paragraph itself is the rule and the link opens it.

Title 8 §5144(d)(3): Cal/OSHA's respiratory protection standard carries the same selection rule: the respirator must be adequate for the hazard and the employer must use a cartridge change schedule or an end-of-service-life indicator for gas and vapor cartridges.

Source: California Code of Regulations, Title 8, as published by Cal/OSHA (dir.ca.gov), read Nov 2–3 2026.

What the makers' data lists for paint overspray, solvent vapors and isocyanate

Neither maker's published cartridge chart names isocyanates as a protection: the North chart lists organic vapor (OV) cartridges and P100 filters, and Dräger's selection guide lists its OV and OV/P100 filters for the solvents (toluene, xylene, acetone, 2-butanone). 29 CFR 1910.94(c)(6)(iii) names an air-supplied respirator for the operator downstream of the object in a booth. The North CF2000 continuous-flow supplied-air assemblies and the Primair 100 hoods are on their own pages.

North cartridges and filters whose chart entry covers it

Source: North Cartridge & Filter Reference Chart; NIOSH approval labels (PIP).

North facepieces

Source: North product sheets (PIP).

Dräger filters listed for it

Source: Dräger Guide for Selection and Use of Respiratory Filtering Devices, NIOSH (DMC-104642); Dräger X-plore Bayonet Filters NIOSH product information (DMC-109824); Dräger X-plore 8000 product information (DMC-102510).

Dräger masks

Source: Dräger Product Catalog, Industrial Applications (DMC-107423).

Dräger X-plore 8000 PAPR blowers

Source: Dräger X-plore 8000 product information (DMC-102510).

Dräger selection guide entries

5 entries in the Dräger respiratory selection guide match paint overspray, solvent vapors and isocyanate; each names the filters by part number.

Source: Dräger Respiratory Protection Selection Guide (PIP document library).

Assigned protection factor

Source: OSHA 29 CFR 1910.134 Table 1 (Assigned Protection Factors). The APF applies only when the respirator is used in a program that meets the standard, including fit testing of tight-fitting facepieces (29 CFR 1910.134(f)) and a cartridge change schedule (29 CFR 1910.134(d)(3)(iii)).

Guides: half mask vs full facepiece · assigned protection factors · cartridge change schedules · P100 vs N95 vs R95 · what OSHA requires for fit testing · cleaning and storing respirators.

Respirators for Spray Painting and Isocyanates questions

What respirator does OSHA name for spray booths? 29 CFR 1910.94(c)(6)(iii)(a): when an operator is in a booth downstream from the object being sprayed, an air-supplied respirator or other NIOSH-approved respirator for the material being sprayed must be used.

What cartridge color is organic vapor? Black on the North chart (N75001L); black and magenta for the OV cartridge with P100 filter (7581P100L). Dräger's bayonet OV filter is 6738024 and the OV/P100 combination is 6738034.