Respirator selection
Methanol respirator selectionCH4O
Solvent, antifreeze/de-icer, fuel and fuel additive, windshield-washer fluid, and feedstock (formaldehyde, biodiesel). Chemical manufacturing.
Calculator for Methanol
Result
Enter a concentration and an exposure limit to see the
compliant respirators and their Maximum Use Concentration.
Hazard ratio = concentration ÷ OEL · Minimum APF must meet or exceed it · MUC = APF × OEL (capped at IDLH). Source: OSHA 29 CFR 1910.134(d)(3)(i)(A), Table 1 — Assigned Protection Factors. Last verified 2026-07-16.
Maximum use concentration for Methanol by respirator
MUC = APF × the OSHA PEL (200 ppm), capped at the IDLH (6,000 ppm). Use this as a reference for the highest concentration each respirator class may be used at.
| Respirator | APF | MUC (ppm) |
|---|---|---|
| Air-Purifying Respirator · Quarter mask | 5 | 1,000 |
| Air-Purifying Respirator · Half mask | 10 | 2,000 |
| Supplied-Air Respirator (Airline) · Half mask · Demand | 10 | 2,000 |
| Self-Contained Breathing Apparatus · Half mask · Demand | 10 | 2,000 |
| Powered Air-Purifying Respirator · Helmet / hood | 25 | 5,000 |
| Powered Air-Purifying Respirator · Loose-fitting facepiece | 25 | 5,000 |
| Supplied-Air Respirator (Airline) · Helmet / hood · Continuous flow | 25 | 5,000 |
| Supplied-Air Respirator (Airline) · Loose-fitting facepiece · Continuous flow | 25 | 5,000 |
| Air-Purifying Respirator · Full facepiece | 50 | 6,000IDLH |
| Powered Air-Purifying Respirator · Half mask | 50 | 6,000IDLH |
| Supplied-Air Respirator (Airline) · Full facepiece · Demand | 50 | 6,000IDLH |
| Supplied-Air Respirator (Airline) · Half mask · Continuous flow | 50 | 6,000IDLH |
| Supplied-Air Respirator (Airline) · Half mask · Pressure-demand / positive-pressure | 50 | 6,000IDLH |
| Self-Contained Breathing Apparatus · Full facepiece · Demand | 50 | 6,000IDLH |
| Powered Air-Purifying Respirator · Full facepiece | 1,000 | 6,000IDLH |
| Supplied-Air Respirator (Airline) · Full facepiece · Continuous flow | 1,000 | 6,000IDLH |
| Supplied-Air Respirator (Airline) · Full facepiece · Pressure-demand / positive-pressure | 1,000 | 6,000IDLH |
| Self-Contained Breathing Apparatus · Full facepiece · Pressure-demand / positive-pressure | 10,000 | 6,000IDLH |
Notes
REL TWA 200 ppm (260 mg/m3) ST 250 ppm (325 mg/m3) [skin]; PEL TWA 200 ppm; IDLH 6,000 ppm; MW 32.1; conversion 1 ppm = 1.31 mg/m3. NIOSH REL carries [skin] (dermal absorption) notation.
Sources
- https://www.cdc.gov/niosh/npg/npgd0397.html
- https://www.cdc.gov/niosh/idlh/67561.html
- https://www.osha.gov/annotated-pels/table-z-1
Data confidence: high. Values are cited from OSHA and NIOSH but should be verified against the current source and a qualified professional before use. See how this works.