Hazardous Materials Handling and Storage

Proper handling and storage of hazardous materials is essential to preventing fires, explosions, chemical reactions, and toxic exposures. OSHA's general industry standards address specific hazardous material categories including flammable and combustible liquids (29 CFR 1910.106), compressed gases (29 CFR 1910.101), and explosives. The primary principles for safe storage include segregation by hazard class (never store oxidizers next to flammables), secondary containment for liquid spills, ventilation to prevent accumulation of vapors, and proper bonding and grounding to prevent static discharge.

Flammable liquids with a flashpoint below 100°F (Class I) present the most acute fire risk. They must be stored in approved safety cans (no more than 5 gallons) for workplace use, or in approved flammable storage cabinets (no more than 60 gallons per cabinet, no more than 3 cabinets per 500 sq ft fire area). Storage rooms must have ventilation, fire suppression, and self-closing doors. The SDS Section 5 and Section 7 are the primary references for fire-fighting and storage requirements for specific chemicals.

Compressed gas cylinders require specific handling procedures: always secure cylinders upright with chains or straps to prevent tipping, keep valve protection caps on when not in use, never use cylinders as rollers or supports, transport only on approved cylinder carts, and store fuel gases (acetylene, propane) separate from oxidizers (oxygen) by at least 20 feet or a 5-foot, 30-minute fire-rated barrier. Acetylene cylinders must always be stored and used upright — using them on their side causes acetone (used as a stabilizer) to enter the regulator and tubing, creating instability.

Supervisors must establish and enforce chemical compatibility rules. Some combinations produce dangerous reactions: mixing bleach with ammonia generates toxic chloramine gas; mixing acids with cyanide salts releases hydrogen cyanide. Incompatible chemicals must be physically separated in storage — not just by labeling. Emergency spill response procedures must be known in advance, and workers must understand when to evacuate versus when trained spill responders can safely address a release.