Xylenes (o-, m-, p-isomers)

CAS: 1330-20-7

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RTECS: N/A

OSHA PEL (8-hr TWA) 100 ppm OSHA PEL: 100 ppm / 435 mg/m3

NIOSH REL 100 ppm NIOSH REL: 100 ppm(ST) 150 ppm

IDLH Threshold 1000 ppm Imm. Dangerous to Life/Health

Skin Hazard Notation No Dermal standard 29 CFR 1910

Interactive Engine

Xylenes (o-, m-, p-isomers) Shift Exposure & PPE Compliance Calculator

Input your measured workplace air sample concentration and work shift schedule. The engine applies the Brief & Scala mathematical reduction model to determine legally defensible compliance.

Measured Air Concentration (ppm)

ppm

Work Schedule / Shift Duration

OSHA Compliance Determination Awaiting Sample Input

Adjusted PEL (Brief-Scala)

Hazard Ratio (HR)

Mandated APF Respirator

Enter an air sampling concentration above to evaluate whether your facility triggers the OSHA Action Level (0.5× PEL) or requires mandatory respiratory protection under 29 CFR 1910.134.

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Generates an instant 1-page OSHA 29 CFR 1910.1000 compliance record.

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NIOSH Respirator & Barrier Protection Specifications

Required Cartridge / Filter Organic Vapor (Black)

Certified for concentrations within permissible limits.

Chemical Barrier Gloves Viton or Silver Shield / 4H

Prevents transdermal permeation.

NIOSH Respiratory Protocol:

Mandatory NIOSH-approved Organic Vapor (Black) required when airborne concentration exceeds action level under OSHA 29 CFR 1910.134.

Respirator Equipment Buy Organic Respirator

Dermal Barrier Chemical Barrier Gloves

B2B Industrial Supply Grainger Cartridge Catalog

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Frequently Asked Questions About Xylenes (o-, m-, p-isomers) Exposure

What is the legal OSHA PEL for Xylenes (o-, m-, p-isomers)?

Under OSHA 29 CFR 1910.1000 Table Z-1, the 8-hour Time-Weighted Average (TWA) Permissible Exposure Limit (PEL) for Xylenes (o-, m-, p-isomers) (CAS 1330-20-7) is 100 ppm. In addition, NIOSH recommends a Recommended Exposure Limit (REL) of 100 ppm.

How do extended 10-hour and 12-hour shifts affect Xylenes (o-, m-, p-isomers) exposure limits?

Because OSHA PELs are formulated for 8-hour workdays, working 10-hour or 12-hour shifts reduces recovery time. Applying the standard Brief & Scala mathematical model reduces the allowable concentration by a Reduction Factor (RF = 0.700 for 10-hr, RF = 0.500 for 12-hr). For Xylenes (o-, m-, p-isomers), an 8-hr PEL of 100 ppm adjusts to half that value on a 12-hour shift.

What respirator and PPE is required when handling Xylenes (o-, m-, p-isomers)?

When atmospheric concentrations exceed the permissible limit up to 10× PEL, OSHA 29 CFR 1910.134 mandates a half-mask elastomeric respirator equipped with Organic Vapor (Black). For dermal exposure, Viton or Silver Shield / 4H are recommended.

What is the IDLH threshold for Xylenes (o-, m-, p-isomers)?

The Immediately Dangerous to Life or Health (IDLH) concentration established by NIOSH for Xylenes (o-, m-, p-isomers) is 1000 ppm. Any entry into atmospheres at or above this concentration requires positive-pressure supplied air or Self-Contained Breathing Apparatus (SCBA).

⚖️ Solvent & Chemical Comparisons Involving Xylenes (o-, m-, p-isomers)

Head-to-Head Analysis Xylenes (o-, m-, p-isomers) vs. Toluene

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🔬 Related Chemicals Requiring Organic Vapor (Black)

(meta) CAS 99-65-0 (ortho) CAS 528-29-0 (para) CAS 100-25-4 1-Nitropropane CAS 108-03-2 2,3-Epoxy-1-propanol; see Glycidol CAS N/A 2,6-Dimethyl-4-heptanone; see Diisobutyl ketone CAS N/A

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