n-Hexane vs Heptane (n-Heptane)
n-Hexane poses devastating neurotoxic risks of permanent 'glue-sniffer' peripheral neuropathy due to human metabolic conversion to 2,5-hexanedione.
Immediately replace n-hexane with n-heptane or cyclohexane in brake cleaners, leather adhesives, and solvent extraction operations.
Regulatory & Toxicological Matrix
| Safety Parameter | n-Hexane | Heptane (n-Heptane) |
|---|---|---|
| CAS Number | 110-54-3 | 142-82-5 |
| OSHA PEL (8-Hour TWA) | 500 ppm | 500 ppm |
| NIOSH REL | 50 ppm | 85 ppm (Ceiling 440 ppm) |
| ACGIH TLV (Recommended) | 50 ppm (Skin) | 400 ppm (STEL 500 ppm) |
| IDLH (Immediately Dangerous) | 1100 ppm | 750 ppm |
| Vapor Pressure (Volatilization) | 151 mmHg (25�C) | 46 mmHg (25�C) |
| Closed-Cup Flash Point | -22�C (-7�F) | -4�C (25�F) |
| Primary Health & Organ Hazards | Severe peripheral polyneuropathy (2,5-hexanedione metabolite causes axonopathy) | CNS depression, skin defatting; does not form 2,5-hexanedione neurotoxic metabolite |
| Substitution Viability | Critical Hazard - NIOSH REL (50 ppm) is 10x lower than 1971 OSHA PEL (500 ppm) | Recommended Substitute - Eliminates peripheral nerve paralysis hazard |
| Full Chemical Database Profile | View n-Hexane Profile → | View Heptane (n-Heptane) Profile → |
Recommended PPE for Solvent Handling & Transfer
Whether utilizing n-Hexane or Heptane (n-Heptane), ensure your staff is equipped with NIOSH-certified respiratory cartridges and permeation-resistant gloves:
Activated carbon bed absorbs solvent vapors up to 10x or 50x PEL depending on facepiece selection.
Dermal Permeation Barrier Ansell Sol-Vex Nitrile Chemical Handling GlovesSuperior puncture and chemical breakthrough resistance against ketones, aromatics, and aliphatic hydrocarbons.
Planning a Chemical Substitution Pilot?
Avoid regrettable substitutions. Certified Industrial Hygienists (CIH) perform pre- and post-substitution baseline air sampling to verify that solvent alternatives truly reduce overall workforce exposure indices.