Personal protective equipment, or PPE, is any equipment worn on the body to reduce exposure to hazards that can cause injury or illness. This includes items as simple as safety glasses and gloves, and as complex as fully encapsulated chemical suits with self-contained breathing apparatus. PPE protects specific parts of the body (eyes, ears, hands, lungs, skin) from threats that other safety measures can’t fully eliminate.
Where PPE Fits in Workplace Safety
PPE is important, but it’s actually the last line of defense, not the first. The National Institute for Occupational Safety and Health ranks safety controls in order of effectiveness: elimination, substitution, engineering controls, administrative controls, and finally PPE. The idea is straightforward: it’s better to remove a hazard entirely than to ask someone to wear gear that protects against it.
For example, if a machine produces dangerous fumes, the first choice is to eliminate the process or substitute a safer chemical. If that’s not possible, an exhaust ventilation system (an engineering control) captures fumes at the source. Only when those options fall short does PPE come into play. The reason for this ranking is practical. PPE only works when people wear it correctly and consistently, every single time. A ventilation system, by contrast, protects everyone in the room without requiring individual effort.
That said, many jobs require PPE regardless of other controls in place. Construction workers wear hard hats even on well-managed sites. Healthcare workers wear gloves and gowns when caring for patients with infections. PPE fills the gap between what other controls can achieve and what full protection requires.
Types of PPE by Body Part
Respiratory Protection
Respirators and masks protect the lungs from airborne particles, gases, and vapors. The most commonly known is the N95 respirator, which is designed to form a tight seal around the nose and mouth and filter airborne particles with high efficiency. The key difference between an N95 and a standard surgical mask is the fit: an N95’s edges seal against the face, while a surgical mask sits loosely and is not designed to form a seal. That loose fit means a surgical mask can block large droplets but won’t reliably filter out smaller airborne particles.
For more extreme exposures, workers may use powered air-purifying respirators or self-contained breathing apparatus units that supply clean air from a tank, similar to scuba gear for land use.
Eye and Face Protection
Safety glasses, goggles, and face shields protect against flying debris, chemical splashes, and intense light. In the U.S., protective eyewear is tested and marked under the ANSI Z87.1 standard. Products marked “Z87+” have passed impact testing, meaning they can withstand a high-velocity projectile without shattering. Standard safety glasses protect from the front, while goggles create a seal around the eyes for chemical or dust exposure. Face shields cover the entire face but are typically worn along with safety glasses or goggles underneath, not as a standalone.
Hand Protection
Gloves are the most widely used form of PPE, and choosing the right material matters enormously. Different glove materials resist different chemicals, and no single glove protects against everything. The key measurement is “breakthrough time,” the amount of time a chemical takes to seep through the glove material. Once breakthrough occurs, the glove is no longer protecting you.
The differences can be dramatic. Nitrile gloves resist toluene (a common industrial solvent) for over 16 hours, while natural rubber latex gloves break through in just 6 minutes against the same chemical. But flip the scenario to methanol, and latex gloves last over 8 hours while nitrile breaks through in about 3 hours. For acetone, neither material holds up well: nitrile lasts only 2 minutes, latex about 5 minutes. This is why workplaces handling chemicals need glove selection guides specific to the substances their workers encounter.
Hearing Protection
Earplugs and earmuffs reduce noise exposure to prevent permanent hearing loss. Every hearing protector sold in the U.S. carries a Noise Reduction Rating (NRR) on its label, but the actual protection you get is lower than that number suggests. The standard calculation: take the NRR, subtract 7 decibels, and then subtract that result from your workplace noise level. So if you’re exposed to 100 decibels and your earplugs have an NRR of 29, the estimated exposure with protection is 100 minus (29 minus 7), or 78 decibels.
Head and Body Protection
Hard hats protect against falling objects and electrical contact. Coveralls, vests, and full body suits protect skin from chemical splashes, biological hazards, heat, or physical abrasion. In hazardous materials response, the EPA classifies body protection into four levels. Level D is the minimum, consisting of coveralls, safety glasses, and boots when no significant chemical threat exists. Level C adds air-purifying respirators and chemical-resistant clothing when airborne contaminants are known and measurable. Level B requires a self-contained breathing apparatus with chemical-resistant suits for situations needing maximum respiratory protection. Level A is the highest tier: a fully encapsulating, vapor-tight suit with its own air supply, used when the greatest potential for skin and lung exposure exists.
Proper Fit Is a Legal Requirement
PPE that doesn’t fit properly doesn’t protect properly. This principle is now explicitly written into federal regulations. As of January 2025, OSHA’s updated construction PPE standard requires employers to ensure that all personal protective equipment is selected to properly fit each individual worker. This aligns construction rules with standards that already applied to general industry and shipyards. The update matters because ill-fitting PPE creates real risk: a loose respirator leaks contaminated air, oversized gloves reduce grip and dexterity, and a hard hat that slides around won’t stay in place during an impact.
Putting PPE On and Taking It Off
In healthcare and hazardous materials work, the order in which you put on and remove PPE is critical. Getting it wrong can transfer contaminants from the outside of your gear to your skin, hair, or clothing. The CDC outlines a specific sequence for healthcare settings.
When putting PPE on (called “donning”), the order is: gown first, covering from neck to knees with arms covered to the wrists; then mask or respirator, fitted snugly with the nose bridge molded to your face; then goggles or face shield; and finally gloves, extended over the wrists of the gown so no skin is exposed.
When removing PPE (called “doffing”), the order reverses in a specific way to avoid self-contamination. Gloves come off first, since they’re the most contaminated. You peel one off by grasping the outside with the other gloved hand, then slide ungloved fingers under the wrist of the remaining glove to remove it without touching the outer surface. Next, goggles or face shields come off by handling only the headband or earpieces. Then the gown peels away from the shoulders, turning inside out as it rolls off. The mask or respirator comes off last, touched only by the ties or elastic bands, never the front surface. Hand washing happens immediately after everything is off.
When PPE Needs Replacing
OSHA requires that all PPE be maintained in a sanitary and reliable condition. In practice, this means inspecting equipment before each use and replacing it when it shows signs of wear, damage, or contamination. For disposable items like nitrile gloves or surgical masks, that means after a single use or whenever they become torn or visibly soiled. For reusable items like hard hats, safety goggles, and earmuffs, the inspection is more nuanced: cracked shells, scratched lenses that impair vision, deteriorated straps, or compressed foam that no longer seals properly all signal that the item has reached the end of its useful life.
Chemical-resistant gloves deserve particular attention. Even without visible damage, chemical permeation weakens glove material over time. If a glove has been exposed to a chemical near its breakthrough threshold, it should be discarded rather than reused, since the material’s resistance degrades with each exposure. Employers are responsible for providing replacement PPE at no cost to workers whenever existing equipment is no longer safe to use.