7.1 Selection & Care of Protective Clothing and Eye Protection

7.1 Selection & Care of Protective Clothing and Eye Protection

Personal Protective Equipment (PPE) represents an applicator's primary physical defense against occupational pesticide exposure. Under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) and the EPA Worker Protection Standard (WPS), the pesticide label is a legally binding federal document. Applicators are legally mandated to wear all PPE items listed in the "Precautionary Statements" and "Directions for Use" sections of the product label. Operating without the specified protective gear, or substituting inferior materials, constitutes an illegal pesticide application subject to federal and state civil or criminal penalties administered by the Tennessee Department of Agriculture (TDA).

While PPE does not eliminate exposure hazards at the source, it creates a barrier between the chemical and the applicator's body. Dermal contact accounts for over 90% of all occupational pesticide exposures in agricultural and commercial applications. Therefore, selecting clothing and equipment crafted from scientifically proven chemical-resistant materials is critical to maintaining applicator safety.

Chemical Permeation, Penetration, and Material Selection

Understanding how pesticides interact with protective fabrics requires distinguishing between penetration and permeation:

• Penetration occurs when liquid or granular pesticide passes through macroscopic openings in a material, such as woven fabric pores, seam needle holes, zipper tracks, buttonholes, or physical tears.
• Permeation is a molecular-level process where the chemical dissolves into the protective material, diffuses through its matrix, and desorption occurs on the inner surface against the applicator's skin.

Standard work clothing (such as cotton denim, flannel, or polyester blends) offers zero permeation resistance and acts like a sponge, drawing liquid pesticides inward and holding toxic chemicals directly against the skin. True chemical-resistant materials show no measurable chemical breakthrough or degradation during prolonged contact.

Approved Chemical-Resistant Materials

1. Barrier Laminate (e.g., Silvershield®, Tychem®): Provides the broadest spectrum of chemical resistance across virtually all pesticide classes, solvents, and formulations. Highly recommended for handling liquid concentrates, emulsifiable concentrates (EC), and organic solvents.
2. Nitrile Rubber: Synthetic rubber displaying excellent resistance to organic solvents, petroleum distillates, oils, organophosphates, and carbamate insecticides. Ideal for general agricultural glove use.
3. Butyl Rubber: Superior resistance to highly volatile organic solvents, gases, ketones, and specific fumigants. Highly flexible but less resistant to petroleum oils.
4. Neoprene: Provides robust resistance to synthetic pyrethroids, acids, bases, and a wide array of liquid formulations. Offers strong puncture and tear resistance.
5. Viton®: Highly specialized fluorocarbon polymer offering outstanding resistance to halogenated hydrocarbons and aromatic solvents, though costlier than nitrile or neoprene.

Glove Selection Criteria and Absolute Bans

The hands and wrists absorb pesticides faster than almost any other skin area except the groin and head. Selecting correct glove materials is the single most effective action an applicator can take to minimize dermal exposure.

The Absolute Prohibition of Absorbent Glove Materials

CRITICAL RULE: Applicators MUST NEVER wear gloves made of leather, cotton, canvas, or flock-lined fabric when handling or applying pesticides.

Leather and cotton absorb liquid sprays and chemical concentrates immediately. Once contaminated, these porous organic materials cannot be decontaminated; they continuously leach concentrated pesticide directly into the skin of the hand, dramatically increasing cumulative dose. Similarly, flock-lined gloves (gloves with an interior cotton or rayon mesh) absorb liquid that enters through the cuff, creating a toxic moisture trap against the applicator's palm.

Glove Design and Sleeve Configuration Standards

• Thickness: Chemical-resistant gloves must be unlined and should generally have a minimum thickness of 14 mils (0.014 inches) to prevent rapid mechanical tearing and chemical permeation.
• Length: Gloves should extend at least halfway up the forearm (11 to 12 inches minimum) to protect the wrists during dipping or pouring operations.
• Sleeve Positioning Rule:
  • When spraying downward or working at waist height, wear shirt sleeves OVER the glove cuffs so liquid running down the arm drips off the sleeve onto the outside of the glove.
  • When spraying overhead (such as tree canopy spraying or structural attic treatments), wear shirt sleeves INSIDE the glove cuffs, and turn up the glove cuffs slightly to form a cup that catches liquid running down the hands.

Body Wear: Baseline Attire, Coveralls, and Aprons

The level of body protection required varies according to the toxicity of the formulation (Signal Words: DANGER, WARNING, CAUTION) and the specific job task.

Baseline Work Clothing

Even when product labels require minimal PPE, applicators must maintain a baseline defense. Standard baseline attire consists of:

• A long-sleeved shirt and long pants made of tightly woven fabric (minimum 12-oz denim or heavy canvas).
• Chemical-resistant footwear (rubber or neoprene boots).
• Socks and clean underwear.

Chemical-Resistant Coveralls

For higher-toxicity products (WARNING or DANGER) or high-exposure application methods (such as airblast orchard spraying or hand-gun high-pressure spraying), label directions often specify chemical-resistant coveralls. These one-piece garments are typically constructed from non-woven coated synthetic materials (such as spunbonded polyethylene or laminated polypropylene) that block mists and fine droplets while allowing partial moisture vapor release.

Chemical-Resistant Aprons

During mixing, loading, container rinsing, and equipment cleanout, applicators handle raw chemical concentrates. Concentrated liquids pose the highest acute dermal risk. A chemical-resistant apron extending from the chest to below the knees must be worn over coveralls or work clothes during these tasks. The apron shields the torso, thighs, and lap—areas most vulnerable to catastrophic splash injuries when opening containers or pouring liquids.

Footwear Standards

Like gloves, footwear must prevent liquid chemical penetration:

• Applicators must wear unlined chemical-resistant rubber or neoprene boots extending up the calf.
• Prohibited Footwear: Leather boots, canvas sneakers, cloth shoes, and open-toed sandals are strictly illegal for pesticide handling. Leather absorbs liquids and retains pesticide residues indefinitely.
• Pant Leg Rule: Pant legs must ALWAYS be worn ON THE OUTSIDE of boot tops. Tucking pant legs inside boots creates a funnel that directs spilled chemical directly into the footwear.

Ocular and Facial Protection

Eye tissue is exceptionally permeable and highly vascularized. Liquid pesticide splashes, dry dust drift, or volatile chemical vapors contacting the cornea can cause permanent blindness, severe chemical burns, or rapid systemic absorption into the bloodstream.

Types of Ocular Protection

1. Indirect-Vented Chemical Splash Goggles:

   • The gold standard for liquid pesticide handling. Indirect vents feature hooded baffles that allow air circulation (reducing fogging) while preventing liquid droplets or splashes from entering straight into the eye cavity.
   • Must fit snugly against the contours of the face, forming a complete perimeter seal.

2. Direct-Vented Goggles:

   • Feature straight mesh or drilled holes for maximum airflow. Recommended ONLY for non-hazardous dry granules or coarse dusts. NEVER use for liquid concentrates or sprays, as liquid splashes easily enter the ventilation holes.

3. Safety Glasses with Side Shields:

   • Provide impact resistance and front/lateral protection against flying solid particles, seeds, or coarse granules. They do NOT provide a perimeter seal and must not be substituted when handling liquid splashes or fine mist hazards.

4. Full-Face Shields:

   • Constructed of clear polycarbonate or acetate to protect the eyes, nose, mouth, and neck from liquid splashes during mixing and loading.
   • Important Note: A face shield protects against splashes but does NOT form an airtight or liquid-tight seal around the eyes. When handling highly toxic liquid concentrates (Category I DANGER/POISON), applicators should wear chemical splash goggles underneath a face shield.

Chemical Resistance Reference Matrix