HazCom + SDS (Chemical Right-to-Know)
Why this matters
OSHA's Hazard Communication Standard (29 CFR 1910.1200) - "HazCom" or "Right-to-Know" - requires every employer whose employees handle chemicals to maintain a written program, label containers, provide Safety Data Sheets (SDS), + train workers. Field service trades handle MANY chemicals: solvents, cleaners, refrigerants, fuels, pesticides, paints, adhesives. HazCom is the most-frequently cited OSHA standard year after year - easy to overlook, easy to comply with, easy to fail.
The four pillars
OSHA's HazCom standard requires:
- Written HazCom program - the employer's documented policy
- Container labeling - every chemical container with hazard ID + manufacturer + protective information
- SDS access - Safety Data Sheets accessible to every employee for every chemical they use
- Employee training - initial + refresher on hazards, controls, emergency procedures
Missing any pillar = OSHA citation.
The 16-section SDS (GHS-aligned)
Safety Data Sheets follow the Globally Harmonized System (GHS) format - 16 standardized sections that EVERY SDS includes:
- Identification - product name, manufacturer, contact
- Hazard identification - pictograms, signal words, hazard statements
- Composition / ingredients - chemical names + CAS numbers + percentages
- First aid measures - what to do if exposed
- Firefighting measures - extinguishing media, special hazards
- Accidental release measures - spill response
- Handling + storage - safe practices
- Exposure controls / PPE - required PPE + ventilation
- Physical + chemical properties - flash point, vapor pressure, pH
- Stability + reactivity - what NOT to mix it with
- Toxicological information - health effects
- Ecological information - environmental impact
- Disposal considerations - how to dispose properly
- Transportation information - DOT shipping info
- Regulatory information - federal + state compliance
- Other information - date of preparation, references
Sections 1, 2, 3, 4, 7, 8 are the most frequently consulted by techs in the field. Sections 9 - 11 + 14 - 16 are required but rarely consulted day-to-day.
GHS hazard pictograms
Eight pictograms identify hazard classes - every chemical label + SDS shows applicable ones:
- Health hazard (silhouette with starburst) - carcinogen, mutagen, reproductive toxin, respiratory sensitizer
- Flame - flammable, pyrophoric, self-heating
- Exclamation mark - irritant, narcotic, sensitizer (less severe than health hazard)
- Gas cylinder - gas under pressure
- Corrosion (hand + surface burning) - corrosive to skin / eye / metal
- Exploding bomb - explosive, self-reactive, organic peroxide
- Flame over circle - oxidizer
- Environment (dead fish + tree) - aquatic toxicity
- Skull + crossbones - acute toxicity (lethal)
Train techs to recognize all 8 pictograms.
Signal words
Either "Danger" (most severe hazards) OR "Warning" (less severe) - one or the other, never both.
Common service-trade chemicals + their hazards
| Chemical | Trade | Key hazards | PPE |
|---|---|---|---|
| Muriatic acid | Plumbing / pool | Corrosive (skin / eye); respiratory irritant | Acid suit, face shield, gloves |
| PVC primer | Plumbing | Flammable, respiratory irritant | Ventilation, gloves |
| Refrigerant (HFC) | HVAC | Asphyxiant (high concentration); skin frostbite | EPA 608; gloves; ventilation |
| Brazing flux | HVAC / plumbing | Skin / eye irritant; fume inhalation | Ventilation, gloves, eye |
| Pesticide concentrate | Pest control | Acute toxicity (varies); endocrine concerns | State license + label PPE |
| Sodium hypochlorite (bleach) | Cleaning | Corrosive; release Cl gas if mixed | Gloves, eye, ventilation |
| Quaternary ammonium | Cleaning / disinfection | Skin sensitizer | Gloves |
| Solvents (mineral spirits, MEK) | Painting / cleaning | Flammable; CNS effect | Ventilation, gloves |
| Battery acid | Auto / equipment | Corrosive | Gloves, eye, acid suit |
| Pool chlorine tabs (trichlor) | Pool service | Oxidizer (releases Cl gas if wet) | Dry storage; never mix with anything |
| Stripping solvent | Cleaning | Flammable; respiratory; skin | Full PPE, ventilation |
Where SDS lives (employer + field access)
OSHA requires "readily accessible" - usually means BOTH:
- Master file at the office (binder, electronic database, OR online subscription)
- Field access via tech's phone (electronic SDS subscription like 3E, MSDSonline, Chemwatch, FREE Pubchem)
Customer's premises: if a chemical is stored on customer's premises during work, the SDS must be available on-site OR within reasonable retrieval time.
Container labeling
Every chemical container at the workplace must have:
- Product identifier
- Hazard pictogram(s)
- Signal word
- Hazard statement(s)
- Precautionary statement(s)
- Manufacturer name + emergency contact
Manufacturer-supplied containers come labeled. SECONDARY containers (the tech's spray bottle) must ALSO be labeled if used for more than the immediate task. Many techs decant chemistry into spray bottles + skip labeling - common OSHA citation.
Training requirements
Initial training when:
- Employee assigned to handle hazardous chemicals
- New chemical introduced
- Refresher at intervals (typically annual; some programs longer)
Training topics:
- Identification of HazCom standard + program
- Recognition of hazardous chemicals + hazards
- Hazard communication system (labels, SDS, pictograms)
- Specific procedures for each chemical
- Specific PPE + first-aid
- Emergency procedures
- How to read an SDS
Document each training event: date, attendees, content, trainer. OSHA inspectors check.
Hazardous waste consideration
Many service-trade chemicals are also hazardous waste when discarded. Federal RCRA + state hazardous waste regulations apply:
- Used oil + filter
- Used solvent + paint
- Recovered refrigerant
- Pesticide concentrate / partial drums
- Battery acid + lead-acid batteries
- Mercury thermostats (legacy)
Disposal through approved hauler + manifest documentation.
State-specific additions
- California Proposition 65 - additional labeling for substances known to cause cancer or birth defects
- State right-to-know laws (varies)
- State pesticide applicator licensing
References
- OSHA 29 CFR 1910.1200 (Hazard Communication Standard)
- GHS (Globally Harmonized System of Classification + Labeling)
- OSHA Toolkit for Hazard Communication
- State-specific right-to-know laws
- Manuall internal: OSHA Quick Reference for Field Work, Job-Site Safety Checklist