1.1 WHMIS, SDS & Hazardous Materials

WHMIS 2015 and GHS Alignment

The Workplace Hazardous Materials Information System (WHMIS 2015) is Canada's national hazard communication standard, updated to align with the Globally Harmonized System of Classification and Labelling of Chemicals (GHS). Enforced federally through the Hazardous Products Act and provincially via Occupational Health and Safety (OHS) regulations, WHMIS 2015 divides workplace chemicals into two main hazard groups:

1. Physical Hazards: Based on chemical and physical properties (e.g., flammable liquids/gases, oxidizers, gases under pressure, self-reactive substances, pyrophoric materials, and metal corrosives).
2. Health Hazards: Based on physiological toxicity (e.g., acute toxicity, skin corrosion/irritation, serious eye damage, respiratory/skin sensitization, carcinogenicity, reproductive toxicity, specific target organ toxicity, and aspiration hazards).

Hazards are depicted using standardized red-diamond GHS pictograms. Essential pictograms encountered by industrial mechanics include:

• Flame: Flammable liquids, aerosol, and gas.
• Flame over Circle: Oxidizing materials that promote combustion.
• Gas Cylinder: Compressed, liquefied, or dissolved gases under pressure.
• Corrosion: Corrosive liquids or solids capable of damaging skin, eyes, or metal.
• Exploding Bomb: Explosive or self-reactive hazards.
• Skull and Crossbones: Severe acute toxicity (fatal or toxic if swallowed, inhaled, or absorbed).
• Health Hazard: Chronic hazards (carcinogenicity, mutagenicity, respiratory sensitization, target organ toxicity).
• Exclamation Mark: Less severe acute toxicity, skin/eye irritation, or skin sensitization.
• Biohazardous Infectious Materials: A black circle with three overlapping crescents (a biohazard symbol retained specifically in Canada).

Supplier Labels vs. Workplace Labels

Proper container labelling is a fundamental OHS requirement across all industrial facilities.

Supplier Labels

Applied by the chemical manufacturer or distributor, a supplier label must feature a hatch-mark border (if under legacy WHMIS, though GHS uses solid borders) and must contain seven core elements:

1. Product identifier (brand name or chemical name)
2. Initial supplier identifier (name and contact details)
3. GHS hazard pictogram(s)
4. Signal word (Danger for severe hazards, Warning for less severe hazards)
5. Hazard statements (standardized phrases describing the nature of the hazard)
6. Precautionary statements (measures to prevent or minimize adverse effects)
7. Supplemental label information

Workplace Labels

Applied when a product is decanted from a primary container into a shop bottle, transferred to a secondary dispenser, or when a supplier label becomes damaged or illegible. Legally, a workplace label requires only three items:

1. Product identifier (exact product name matching the SDS)
2. Safe handling precautions (specific instructions and required PPE)
3. Explicit reference to the availability of the Safety Data Sheet (e.g., "See SDS for detailed safety information")

Safety Data Sheets (SDS) 16-Section Standard

The GHS mandates a standardized 16-section Safety Data Sheet (SDS) format. Millwrights must navigate these sections swiftly during maintenance operations and emergency response:

Storage Requirement: SDS binders or electronic access terminals must be located in unhindered areas readily accessible to all maintenance personnel on every shift. Binders locked inside administrative offices or behind password-protected systems without worker authorization violate Canadian health and safety regulations.

Handling Shop Chemicals, Solvents & Cutting Fluids

Industrial maintenance involves frequent contact with heavy lubricants, industrial solvents, cutting fluids, and process chemicals:

• Lubricants and Greases: Synthetic oils, extreme-pressure (EP) greases containing molybdenum disulfide or zinc dialkyldithiophosphate (ZDDP), and open gear compounds present dermal hazards. Prolonged exposure causes oil acne, dermatitis, and potential skin carcinomas. Barrier creams and nitrile/neoprene gloves must be utilized.
• Solvents and Degreasers: Chlorinated solvents (e.g., trichloroethylene) and non-chlorinated hydrocarbon solvents (e.g., mineral spirits, acetone) possess low flash points and high vapor pressures. Solvents strip natural oils from skin and emit toxic organic vapors. Solvents must be stored in approved fire-rated safety cabinets compliant with NFPA 30 / National Fire Code of Canada standards. Flammable solvents must be grounded and bonded during fluid transfer to eliminate electrostatic spark hazards.
• Metalworking & Cutting Fluids: Soluble oils, semi-synthetics, and synthetic cutting fluids undergo microbial contamination (bacteria and fungi), producing endotoxins that cause respiratory distress and severe dermatitis. Fluid concentration, pH, and biocide levels must be monitored regularly. Mist collection systems (Local Exhaust Ventilation - LEV) must capture airborne oil mists at the source.
• Welding and Thermal Cutting Fumes: Grinding and welding on alloy steels produce hazardous particulate mists. Welding stainless steel releases Hexavalent Chromium (Cr(VI)), a potent human carcinogen. Welding galvanized steel releases zinc oxide fumes, causing metal fume fever. Millwrights must utilize local exhaust hoods or pancake-style P100 particulate respirators when welding or gouging.

Compressed Gas Cylinder Storage & Handling Rules

Compressed gas cylinders (oxygen, acetylene, argon, nitrogen, propane) represent high-energy pressure vessels and severe fire hazards. Millwrights must enforce strict storage and transport protocols:

General Storage & Handling Regulations

1. Upright Positioning: Cylinders must be stored vertically and secured against falling using steel chains, heavy-duty webbing straps, or dedicated cylinder racks above their center of gravity.
2. Valve Protection Caps: When cylinders are not in active service or connected to a regulator manifold, protective steel valve caps must be securely threaded hand-tight over the cylinder valve stem.
3. Temperature Controls: Storage areas must be dry, well-ventilated, and kept below 52°C (125°F), isolated from open flames, electrical arcs, or direct radiant heat.

Oxygen & Fuel Gas Separation Rules

In storage, oxygen cylinders must be separated from fuel-gas cylinders (acetylene, propane, MAPP) or combustible materials (oils, greases, scrap lumber) by:

• A minimum distance of 6 metres (20 feet), OR
• A non-combustible firewall at least 1.5 metres (5 feet) high, possessing a fire-resistance rating of at least 30 minutes (0.5 hour).

+-----------------------+              +-----------------------+
|  OXYGEN CYLINDERS     |  <-- 6m -->  |  FUEL GAS CYLINDERS   |
|  (Compressed O2)      |   (20 ft)    | (Acetylene / Propane) |
+-----------------------+              +-----------------------+
                                 OR
+-----------------------+  | 1.5m Fire |  +-----------------------+
|  OXYGEN CYLINDERS     |  | Wall      |  |  FUEL GAS CYLINDERS   |
|  (Compressed O2)      |  | (30 min)  |  | (Acetylene / Propane) |
+-----------------------+  |           |  +-----------------------+

Acetylene Specific Safety

Acetylene gas (C₂H₂) is chemically unstable above 103 kPa (15 psig) free gauge pressure. Cylinders are packed with a porous monolithic mass saturated with liquid acetone, which absorbs up to 25 times its volume in acetylene. Acetylene cylinders must never be laid on their side; if stored horizontally, acetone leaks into the valve and piping, leading to explosive decomposition upon ignition. If an acetylene cylinder is accidentally laid horizontally, it must stand upright for a minimum of 2 to 4 hours before opening the valve.

Personal Protective Equipment (PPE) Standards

Personal protective equipment represents the final control barrier under the OHS Hierarchy of Controls:

• Eye and Face Protection (CSA Z94.3): Basic safety glasses with side shields are mandatory in all maintenance areas. Full face shields must be worn over safety glasses during grinding, gouging, wire brushing, or handling corrosive chemicals.
• Hearing Protection (CSA Z94.2): Hearing protection is mandatory when noise levels reach or exceed an 8-hour Time-Weighted Average (TWA) of 85 dBA. Noise Reduction Ratings (NRR) dictate whether earplugs, earmuffs, or dual protection (plugs + muffs above 100 dBA) are required.
• Footwear (CSA Z195): Protective footwear must carry the CSA Green Triangle patch (Grade 1 protective toe cap capable of withstanding 125 Joules impact, combined with a puncture-resistant steel/composite sole plate). Work around energized electrical gear requires the White Omega symbol (electric shock resistance up to 18,000 Volts).
• Hand Protection: Glove selection must match the hazard (nitrile for solvents, leather for welding/rigging, cut-resistant Kevlar for sheet metal). CRITICAL SAFETY RULE: Gloves must NEVER be worn while operating rotating machine tools such as lathes, drill presses, milling machines, or grinding wheels due to snagging hazards.
• Respiratory Protection (CSA Z94.4): Air-purifying cartridge respirators are permitted only when the atmospheric contaminant is identified, its concentration is below the Maximum Use Concentration (MUC), and oxygen levels are normal. If the atmosphere is unknown, oxygen-deficient (<19.5%), or Immediately Dangerous to Life or Health (IDLH), workers MUST wear a Self-Contained Breathing Apparatus (SCBA) or a Supplied-Air Respirator (SAR) with an auxiliary escape cylinder.