3.3 Personal Protective Equipment (PPE) Selection & Maintenance

3.3 Personal Protective Equipment (PPE) Selection & Maintenance

Personal Protective Equipment (PPE) serves as an applicator's final physical barrier defense against pesticide exposure. Under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) and Washington State pesticide regulations (RCW 17.21 and WAC 16-228), PPE requirements specified on the product label are legally binding minimum safety requirements. Operating with inadequate PPE constitutes a federal and state regulatory violation.

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Chemical-Resistant Equipment & Barrier Materials

Standard cotton work clothes, denim jeans, and leather boots are porous materials that absorb liquid pesticides, holding toxic chemicals in direct contact with skin. Chemical-resistant PPE is constructed from synthetic non-porous barrier polymers that prevent liquid penetration during operational handling.

1. Glove Selection & Barrier Compatibility

Because hands handle concentrated products, nozzles, and application gear, gloves represent the single most important piece of PPE. The EPA categorizes pesticide product solvent carriers into Chemical Resistance Categories (A through H), dictating mandatory glove barrier materials on product labels.

STRICT MATERIAL PROHIBITION: Under no circumstances may applicators wear gloves or footwear constructed of cotton, leather, canvas, or cloth lining when handling pesticides. Leather absorbs liquid pesticides rapidly, traps chemicals inside the matrix, and cannot be decontaminated—acting as a permanent chemical reservoir against skin.

2. Body Outerwear, Footwear, and Eye Protection

• Body Outerwear: When mixing/loading Category I or II concentrates, applicators must wear chemical-resistant aprons or full-body suits (e.g., Tyvek® QC, rubber aprons) over regular work clothing.
• Footwear: Wear unlined rubber or polyurethane boots that extend above the ankle. Pant legs must always be worn ON THE OUTSIDE of boots to prevent liquid pesticide spills from funneling directly into the boots.
• Eye Protection: Standard prescription glasses or open safety glasses offer zero splash protection. Applicators must wear ANSI Z87.1-certified indirect-vent chemical splash goggles, full-face shields, or full-facepiece respirators during mixing, loading, or overhead spraying.

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Respiratory Protection Systems: OSHA 29 CFR 1910.134 & WISHA WAC 296-842

Respiratory protection is mandatory when handling volatile liquids, fumigants, fine mists, dusts, or when required by product labels. In Washington State, respiratory protection programs must comply strictly with WISHA (WAC 296-842) and OSHA (29 CFR 1910.134) standards.

1. Air-Purifying Respirators (APR)

Air-purifying respirators pull ambient air through filtering media to remove airborne particulates, vapors, or gases. They are available as half-mask facepieces, full-facepiece masks, or Powered Air-Purifying Respirators (PAPR).

Particulate Filters

NIOSH classifies mechanical particulate filters into three series based on oil resistance, combined with three efficiency ratings (95%, 99%, 100% / 99.97% filter efficiency):

• N-Series (Not oil resistant): Used only when no oil aerosols or oil-based pesticide carriers are present (e.g., N95, N100).
• R-Series (Resistant to oil): Used when oil aerosols are present, limited to a single shift or 8 hours of continuous use (e.g., R95, R100).
• P-Series (Oil Proof): Used when oil aerosols or EC solvent carriers are present; reusable across multiple shifts per manufacturer guidelines (e.g., P95, P100). P100 filters trap 99.97% of airborne particles down to 0.3 microns.

Organic Vapor (OV) Cartridges

Chemical cartridges contain activated charcoal that chemically adsorbs organic solvent vapors and pesticide mists. Pesticide applicators frequently utilize combination OV/P100 cartridges, which protect against both organic chemical vapors and airborne particulates.

2. Atmosphere-Supplying Respirators

Atmosphere-supplying respirators provide clean breathing air from an independent source. They include Supplied-Air Respirators (SAR) (air line connected to remote compressed air tanks) and Self-Contained Breathing Apparatus (SCBA) (wearable compressed air cylinders). Atmosphere-supplying units are required in Oxygen-Deficient Atmospheres (< 19.5% O2) or during structural and soil fumigation involving lethal gases (e.g., methyl bromide, sulfuryl fluoride, phosphine).

3. Mandatory Compliance Steps: Medical Clearance & Fit Testing

Before an employee or applicator can don a tight-fitting negative-pressure respirator, WISHA/OSHA regulations dictate three mandatory steps:

1. Medical Evaluation: A Licensed Healthcare Professional (PLHCP) must evaluate the worker using a standardized medical questionnaire to ensure they are physically capable of breathing against mask resistance without cardiovascular or pulmonary distress.
2. Annual Fit Testing: A qualified technician must conduct a formal fit test annually and whenever a different mask brand/size is selected:
   • Qualitative Fit Test (QFT): Relies on the user's sensory response (taste/smell) to an aerosolized test agent (e.g., Bitrex®, isoamyl acetate, saccharin, or irritant smoke).
   • Quantitative Fit Test (QNFT): Uses electronic particle counters (e.g., PortaCount®) to measure exact particle concentrations inside vs. outside the facepiece to calculate a numerical Fit Factor.
3. User Seal Checks: The applicator MUST perform both a positive-pressure and negative-pressure user seal check EVERY TIME the respirator is put on:
   • Positive-Pressure Check: Cover exhalation valve with hand and exhale gently; mask should puff slightly outward without air leaking at seal edges.
   • Negative-Pressure Check: Cover inhalation valves/cartridges with hands and inhale gently; facepiece should collapse inward against face and hold collapse for 10 seconds.