HAZMAT / HAZCOM

29 CFR 1910.1200, also known as HAZCOM or the 'Right to Know' standard, requires employers to provide information about hazardous chemicals in the workplace through labels, Safety Data Sheets (SDS), and training. It was updated in 2012 to align with the Globally Harmonized System (GHS) of classification and labeling.

GHS is an international framework for classifying hazardous chemicals and communicating hazard information through standardized labels and Safety Data Sheets. The United States adopted GHS through the 2012 revision of the HAZCOM standard (29 CFR 1910.1200) to ensure consistent hazard communication worldwide.

1) Product identifier (chemical name), 2) Signal word (Danger or Warning), 3) Hazard statement(s), 4) Pictogram(s), 5) Precautionary statement(s), and 6) Supplier identification (name, address, phone number). These elements must appear on the label of every hazardous chemical container.

'Danger' indicates a more severe hazard (e.g., acute toxicity Category 1-3, flammable liquid Category 1). 'Warning' indicates a less severe hazard (e.g., acute toxicity Category 4, flammable liquid Category 4). A product can only have ONE signal word — if both apply, 'Danger' takes precedence.

There are nine GHS pictograms: 1) Flame (flammable), 2) Flame over circle (oxidizer), 3) Exploding bomb (explosive), 4) Skull and crossbones (acute toxicity), 5) Corrosion (corrosive), 6) Gas cylinder (compressed gas), 7) Health hazard/person (carcinogen, respiratory sensitizer), 8) Exclamation mark (irritant, lesser hazards), 9) Environment (aquatic toxicity).

An SDS is a document that provides detailed information about a hazardous chemical including its properties, hazards, safe handling procedures, and emergency measures. Under GHS, the SDS has a standardized 16-section format. Employers must maintain SDSs for all hazardous chemicals in the workplace and make them readily accessible to employees.

1) Identification, 2) Hazard(s) identification, 3) Composition/ingredients, 4) First-aid measures, 5) Fire-fighting measures, 6) Accidental release measures, 7) Handling and storage, 8) Exposure controls/PPE, 9) Physical/chemical properties, 10) Stability and reactivity, 11) Toxicological information, 12) Ecological information, 13) Disposal considerations, 14) Transport information, 15) Regulatory information, 16) Other information.

Section 4: First-Aid Measures. It describes initial care that should be given by untrained responders for the various routes of exposure (inhalation, skin contact, eye contact, ingestion). It also includes symptoms of exposure and any immediate medical attention or special treatment needed.

Section 8: Exposure Controls/Personal Protection. It lists applicable occupational exposure limits (PELs, TLVs), engineering controls (ventilation), and required personal protective equipment including respiratory protection, hand protection, eye/face protection, skin/body protection, and any special requirements.

Section 6: Accidental Release Measures. It describes personal precautions, protective equipment, emergency procedures, methods for containment and cleanup, and environmental precautions for spills or releases. It distinguishes between large and small spills when appropriate.

Employers must: develop a written hazard communication program, maintain an inventory of hazardous chemicals, ensure all containers are properly labeled, maintain accessible SDSs for all hazardous chemicals, and provide initial and ongoing training to employees who work with or near hazardous chemicals.

The written program must describe: how the employer will meet labeling requirements, how SDSs will be maintained and made accessible, employee training procedures, the list of hazardous chemicals in the workplace, methods used to inform employees of hazards of non-routine tasks, and procedures for multi-employer workplaces.

Employees must be trained on: the HAZCOM standard requirements, operations where hazardous chemicals are present, the location and availability of the written program and SDSs, how to read labels and SDSs, methods to detect chemical releases, physical and health hazards, protective measures, and emergency procedures.

Required PPE depends on the specific hazard and is listed in SDS Section 8. It may include: chemical-resistant gloves, safety goggles or face shield, chemical splash apron or suit, respiratory protection (air-purifying or supplied-air respirator), steel-toed boots, and hearing protection if applicable.

Level A: Fully encapsulating suit with SCBA (highest protection). Level B: Chemical splash suit with SCBA (highest respiratory, lower skin). Level C: Chemical splash suit with air-purifying respirator (known contaminant, adequate concentration). Level D: Standard work uniform (no respiratory or skin hazard — nuisance only).

Alert others in the area, evacuate if necessary, avoid contact with the spill, consult the SDS for specific guidance, use appropriate PPE, contain the spill using absorbent materials or dikes (if trained and safe to do so), report to the supervisor and emergency response team, and do NOT flush unknown chemicals down drains.

In Department of Transportation (DOT) context, HAZMAT refers to any substance designated as hazardous under 49 CFR 171-180 (Hazardous Materials Regulations) that poses a risk during transportation. DOT classifies HAZMAT into 9 hazard classes with placards and labels required on transport vehicles and packaging.

Class 1: Explosives, Class 2: Gases, Class 3: Flammable Liquids, Class 4: Flammable Solids, Class 5: Oxidizers and Organic Peroxides, Class 6: Toxic and Infectious Substances, Class 7: Radioactive Materials, Class 8: Corrosives, Class 9: Miscellaneous Dangerous Goods.

A DOT placard is a diamond-shaped sign placed on all four sides of a transport vehicle carrying hazardous materials. Placards display the hazard class number, symbol, and color coding (e.g., red for flammable, yellow for oxidizer, white for poison). Placards are generally required when shipping 1,001 lbs or more of a hazardous material.

The NFPA 704 diamond (fire diamond) is a four-colored diamond system used on buildings and storage areas. Blue = Health hazard, Red = Flammability, Yellow = Instability/Reactivity, White = Special hazards (OX for oxidizer, W with line for water reactive). Each is rated 0 (minimal) to 4 (severe).

Chemical incompatibility means certain chemicals react dangerously when mixed, producing heat, toxic gases, fire, or explosion. Examples: acids + bases (violent reaction), oxidizers + flammables (fire/explosion), bleach + ammonia (toxic chloramine gas). SDSs Section 10 identifies incompatible materials that must be stored separately.

Store chemicals by hazard class (not alphabetically), keep incompatibles separated, store flammables in approved flammable storage cabinets, keep corrosives on low shelves with secondary containment, maintain proper ventilation, keep containers sealed when not in use, label all containers, and follow SDS Section 7 for specific requirements.

Secondary containment is a system designed to catch and contain chemical spills or leaks from the primary container. It must hold at least 110% of the largest container's volume (or 10% of total volume, whichever is greater). Examples include dikes, berms, drip trays, and double-walled containers.

A PEL is the maximum amount or concentration of a chemical that a worker may be exposed to under OSHA regulations (29 CFR 1910.1000). It is usually expressed as a Time-Weighted Average (TWA) over an 8-hour workday. Employers must keep exposures below PELs using engineering controls, administrative controls, and PPE.

A TWA is the average exposure to a chemical over a specified time period, typically 8 hours. It accounts for varying concentrations throughout the workday. A worker may be briefly exposed above the TWA limit if the average over 8 hours remains below the PEL, unless a ceiling limit also applies.

A STEL is the maximum concentration of a chemical a worker can be exposed to for a short period (usually 15 minutes) without experiencing adverse effects. It is higher than the TWA-PEL but has a time restriction. No more than four STEL exposures per day are permitted, with at least 60 minutes between exposures.

Immediately Dangerous to Life or Health (IDLH) is the maximum airborne concentration from which a worker could escape within 30 minutes without experiencing irreversible health effects or escape-impairing symptoms. At or above IDLH concentrations, only supplied-air respiratory protection (SCBA or airline) may be used.

The four routes are: 1) Inhalation (breathing in vapors, dusts, fumes — most common route), 2) Skin/Eye absorption (contact with liquids, dusts, vapors), 3) Ingestion (eating, drinking, or smoking in contaminated areas), 4) Injection (puncture wounds, cuts contaminated with chemicals).

Acute effects occur immediately or shortly after a single exposure (burns, nausea, dizziness). Chronic effects develop over time from repeated or prolonged exposure (cancer, organ damage, respiratory disease). SDSs Section 11 describes both types of toxicological effects for the chemical.

A health hazard is a chemical classified as posing risk to health (carcinogen, toxic, irritant, sensitizer, reproductive toxin, organ toxicant). A physical hazard is a chemical classified as posing physical risk (flammable, explosive, oxidizer, corrosive to metals, compressed gas, self-reactive). A chemical can be both.

Immediately remove contaminated clothing and flush the affected area with large amounts of water for at least 15-20 minutes (unless the SDS specifies otherwise — some chemicals react with water). Do NOT use neutralizing agents unless specifically directed by the SDS. Seek medical attention. Report the exposure.

Immediately flush eyes with clean water or eyewash solution for at least 15-20 minutes, holding eyelids open. Remove contact lenses during flushing if easily done. Do NOT rub eyes. Seek immediate medical attention. Know the location of the nearest eyewash station before working with chemicals.

OSHA requires that eyewash stations and emergency showers be provided within 10 seconds of travel time (approximately 55 feet) from any area where employees may be exposed to corrosive or severely irritating chemicals. Stations must be tested weekly and inspected annually per ANSI Z358.1.

MSDS was the previous format for chemical hazard information before GHS adoption. It had no standardized format. Under the 2012 HAZCOM update, MSDSs were replaced by the standardized 16-section Safety Data Sheet (SDS). Employers should have converted all MSDSs to SDSs by June 1, 2015.

Employers must ensure all incoming containers of hazardous chemicals are labeled with the GHS elements (product name, signal word, hazard statements, pictograms, precautionary statements, supplier info). Workplace (secondary) containers must also be labeled with at least the product identifier and applicable hazard warnings.

A secondary container may be unlabeled ONLY if the employee who transferred the chemical will be the sole user AND will use the entire contents during their work shift. If the container can be accessed by anyone else, or the chemical is not used immediately, it MUST be labeled with at minimum the product identifier and hazard warning.

The ERG is a DOT publication used by first responders during the initial phase of a HAZMAT transportation incident. It helps identify hazards and recommended protective actions based on the UN identification number or placard. The orange-bordered pages provide specific guidance for each material.

Section 2: Hazard(s) Identification includes the GHS classification, signal word, hazard statements, pictograms, precautionary statements, and any hazards not otherwise classified. It provides the summary of all hazard information that appears on the label.

Section 9: Physical and Chemical Properties includes appearance, odor, pH, melting/freezing point, boiling point, flash point, evaporation rate, flammability, vapor pressure, vapor density, specific gravity, solubility, auto-ignition temperature, and decomposition temperature. These properties are critical for safe handling.

The flash point is the lowest temperature at which a liquid gives off enough vapor to form an ignitable mixture with air near the surface of the liquid. A lower flash point means greater flammability risk. Class I flammable liquids have flash points below 100 degrees F (37.8 degrees C).

Employees must: attend HAZCOM training, follow safe handling procedures, wear required PPE, read labels and SDSs before using chemicals, never remove or deface labels, report spills and exposures, know emergency procedures, properly store and dispose of chemicals, and report any concerns about chemical hazards to their supervisor.