6.1 PPE Selection, Chemical Resistance & Laundering Protocols

6.1 PPE Selection, Chemical Resistance & Laundering Protocols

Core Principle: Under FIFRA Section 12(a)(2)(G), all Personal Protective Equipment (PPE) requirements specified on an EPA-approved pesticide label are legally binding. Wearing less than the label-mandated PPE is a direct violation of federal and Colorado state law. Applicators may always choose to wear more protective equipment than the label requires, but never less.

Every professional pesticide handler and agricultural worker in Colorado faces occupational exposure risks. Dermal exposure accounts for over 90% of all occupational pesticide poisoning incidents. Implementing rigorous PPE selection, maintenance, donning, doffing, and laundering protocols is the primary engineering control standing between an applicator and acute systemic toxicity or chronic occupational illness.

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1. Baseline Work Attire vs. Label-Mandated PPE

Pesticide safety standards distinguish between everyday baseline work attire and specialized Personal Protective Equipment (PPE):

┌─────────────────────────────────────────────────────────────────────────────┐
│                     WORK ATTIRE VS. MANDATED PPE HIERARCHY                  │
├─────────────────────────────────────────────────────────────────────────────┤
│                                                                             │
│  BASELINE WORK CLOTHING (Occupational Standard)                             │
│   • Long-sleeved shirt and long pants (tightly woven fabric)                │
│   • Socks and closed-toe work shoes                                         │
│   • Minimum attire required for handling any commercial formulation         │
│                                                                             │
│  LABEL-MANDATED PPE (Legally Binding Under FIFRA)                           │
│   • Chemical-resistant gloves (minimum 14 mil thickness, unlined)           │
│   • Chemical-resistant footwear (unlined rubber or neoprene boots)          │
│   • Protective eyewear (chemical splash goggles, face shield, side-shields) │
│   • Chemical-resistant aprons, suits, and headgear                          │
│   • NIOSH-approved respiratory protection devices                           │
│                                                                             │
└─────────────────────────────────────────────────────────────────────────────┘

When a pesticide label specifies "chemical-resistant" gear, it legally requires material that prevents measurable movement of the pesticide active ingredient and solvent carrier through the barrier during the entire period of operational use. Everyday waterproof materials (such as standard raincoats or thin household dishwashing gloves) do not automatically qualify as chemical-resistant.

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2. EPA Chemical Resistance Categories (A through H)

The EPA Chemical Resistance Category Selection Chart sorts pesticide formulations into eight solvent categories, A through H, and rates eight glove materials against each. The category is determined by the solvent carrier in the formulation, not the active ingredient, because the carrier solvent generally permeates a barrier first and at a higher rate. EPA permits registrants to print only the materials rated high on a product label.

[!IMPORTANT] Ratings are service intervals, not brand rankings. A category-and-material pairing tells you how long the barrier survives contact, and that is the number the exam tests.

Barrier Material Characteristics

• Barrier Laminate: Multi-layered composite film — the only material EPA rates high in every category, A through H. Offers the broadest protection but poor tactile dexterity and tear resistance.
• Butyl Rubber: Rated high for water-based formulations (A), ketones (B), alcohols (C), acetates (D) and dilute aromatics (F); drops to slight in aliphatic petroleum distillates (E) and concentrated aromatics (G).
• Nitrile Rubber: Versatile acrylonitrile-butadiene copolymer rated high in categories A, C, E and F, with excellent puncture, snag and abrasion resistance and good dexterity. It is not acceptable for ketones (B) or for category G/H solvents.
• Neoprene Rubber: Synthetic rubber providing balanced resistance to moderate acids, alkalis, and petroleum oils. Moderately durable and comfortable.
• Natural Rubber (Latex): Only acceptable for aqueous formulations (Category A). Completely degraded by organic solvents, petroleum carriers, and emulsifiable concentrates.
• Polyvinyl Chloride (PVC): Synthetic thermoplastic coating resistant to aqueous solutions, acids, and certain oils, but dissolves in ketones and aromatic solvents.
• Viton®: Fluorocarbon elastomer rated high in categories A, C, E, F, G and H — the only material besides barrier laminate that survives concentrated aromatics and halogenated hydrocarbons. It is only slightly resistant to ketones (B) and acetates (D). Highly durable but by far the most expensive option.

┌─────────────────────────────────────────────────────────────────────────────┐
│         EPA CHEMICAL-RESISTANCE RATINGS (footnotes to the EPA chart)        │
├─────────────────────────────────────────────────────────────────────────────┤
│  • HIGH:     Highly chemical-resistant. Clean or replace the PPE at the     │
│              end of each day's work period; rinse pesticide off at breaks.  │
│  • MODERATE: Moderately chemical-resistant. Clean or replace the PPE        │
│              within an hour or two of contact.                              │
│  • SLIGHT:   Slightly chemical-resistant. Clean or replace the PPE within   │
│              TEN MINUTES of contact.                                        │
│  • NONE:     No chemical resistance. Do not wear this material where        │
│              contact with the pesticide is possible.                        │
│                                                                             │
│  All ratings assume the material is at least 14 mils thick, except barrier  │
│  laminate and polyethylene.                                                 │
└─────────────────────────────────────────────────────────────────────────────┘

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3. Hand, Foot, Body, and Eye Protection

Hand Protection: The 14-Mil Glove Rule

Over 85% of dermal pesticide exposure occurs on the hands and forearms during mixing, loading, nozzle cleaning, and application. The regulatory standard requires:

• Unlined Chemical-Resistant Gloves: Gloves must be unlined rubber or polymer. Lined, flocked, cotton, canvas, or leather gloves are strictly illegal. Flocking and fabric linings act as wicks via capillary action, absorbing chemical concentrate and creating an inescapable toxic compress against the skin.
• Minimum Thickness: Chemical-resistant gloves must be at least 14 mils (0.014 inches) thick, unless manufactured from barrier laminate or specialized polyethylene films.

Footwear Protection

• Unlined Rubber or Neoprene Boots: Footwear must extend above the ankle and be made of solid rubber, neoprene, or PVC.
• Prohibited Footwear: Leather work boots, canvas shoes, and athletic sneakers are strictly prohibited when chemical-resistant footwear is mandated. Leather absorbs solvents and active ingredients irreversibly; once contaminated, leather boots can never be cleaned and will continuously poison the wearer.

Body and Eye Protection

• Coveralls and Chemical-Resistant Suits: Coveralls worn over baseline work clothes provide a double layer of defense. When high-volume spraying or air-blast applications create dense mist, a chemical-resistant suit (such as coated Tychem® or rubberized PVC) is required.
• Chemical-Resistant Apron: Mandatory during mixing and loading, pouring chemical concentrates, and cleaning equipment. The apron must cover the handler from the mid-chest to below the knees.
• Protective Eyewear: Must meet ANSI Z87.1 impact and splash standards.
  • Safety Glasses with Side/Brow Shields: Acceptable only for dry granular applications or low-pressure coarse streams.
  • Chemical Splash Goggles: Indirectly vented to prevent chemical droplets and mists from penetrating while allowing air circulation.
  • Full Face Shield: Worn over goggles when handling concentrated liquids, open pouring, or rinsing containers.

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4. Donning, Doffing, and Inspection Workflows

Pre-Use Inspection Protocol

Before every single application, handlers must inspect all PPE for physical degradation:

1. Visual Check: Look for pinholes, tears, punctures, thinning, cracking, or discoloration.
2. Texture Check: Inspect for swelling, excessive stiffness, brittleness, or gumminess.
3. Glove Water Test: Fill gloves with clean water, roll the cuff tightly downward, and gently squeeze to identify any micro-leaks or pinhole spurts. Discard leaking gloves immediately.

Sleeve and Pant Leg Orientation

To prevent chemical liquids from funneling inside protective gear:

• Spraying Downward (e.g., turf boom, ground wand): Sleeves go inside gloves; pant legs go outside boots.
• Spraying Upward (e.g., tree canopy, structural rafters): Sleeves go outside gloves with glove cuffs taped or cuffed downward; pant legs remain outside boots.

Step-by-Step Doffing Protocol

┌─────────────────────────────────────────────────────────────────────────────┐
│                     MANDATORY PPE DOFFING SEQUENCE                          │
├─────────────────────────────────────────────────────────────────────────────┤
│  1. WASH GLOVES FIRST: Thoroughly wash chemical-resistant gloves with soap  │
│     and water while still wearing them before touching any other gear.      │
│  2. REMOVE APRON / SUIT: Unfasten and peel outward and downward.            │
│  3. REMOVE BOOTS: Step out of boots without touching bare skin to exterior. │
│  4. REMOVE EYEWEAR / RESPIRATOR: Handle strictly by rear straps/bands.      │
│  5. PEEL GLOVES INSIDE-OUT: Roll the cuff downward and peel off inside-out  │
│     so contaminated outer surfaces are enclosed inside.                     │
│  6. WASH HANDS AND FACE: Immediately scrub hands, forearms, and face with   │
│     soap and warm water before drinking, eating, smoking, or using restroom.│
└─────────────────────────────────────────────────────────────────────────────┘

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5. Laundering Protocols & Storage Guidelines

Saturated Clothing Rule

[!CAUTION] Immediate Disposal of Saturated Garments: Any work clothing or fabric coveralls that become drenched or heavily contaminated with a pesticide concentrate labeled with the signal word DANGER or WARNING must be treated as hazardous waste. Do not attempt to wash them. Place them in a heavy-duty sealed plastic bag and dispose of them according to hazardous waste regulations.

Standard Laundering Protocol for Contaminated Clothing

For routine pesticide-exposed work clothing, follow these strict EPA and CSU Extension guidelines:

1. Protective Handling: Always wear unlined chemical-resistant gloves when handling contaminated laundry.
2. Segregation: Never wash pesticide-contaminated clothing with household laundry. Store contaminated items in a dedicated plastic bin outside living quarters.
3. Pre-Treatment: Pre-rinse items outdoors with a garden hose or soak in a bucket of warm water before machine washing.
4. Washing Parameters:
   • Load Size: Wash only a few items at a time in small loads.
   • Water Temperature: Use the hottest water setting available (minimum 140°F / 60°C).
   • Water Level: Select the highest water level to maximize chemical dilution.
   • Detergent: Use a heavy-duty liquid detergent (liquid surfactants bind and emulsify oil-based and solvent residues far more effectively than dry powder detergents).
   • Cycle: Select the longest, heavy-duty wash cycle with an extra rinse.
5. Drying: Line dry outdoors in direct sunlight. Solar ultraviolet (UV) radiation accelerates the photodegradation of remaining chemical residues. Do not use an indoor dryer, as heat and tumbling can volatilize residues into the home or contaminate dryer drums.
6. Decontaminating the Washer: After removing the clean load, run an empty wash cycle with hot water and detergent at the highest water level before laundering any household clothing.

Clean PPE Storage

Clean, dry PPE must be stored in a clean, dedicated storage cabinet or sealed plastic container located completely separate from pesticide storage areas, mixing stations, and chemical vapors. Storing clean respirators or gloves inside a chemical storage shed allows volatile pesticide vapors to saturate the materials prior to use.