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It is a common scene in many industrial plants: someone in purchasing buys a box of disposable face masks, hands them out to personnel exposed to dust or fumes, and considers the matter of respiratory protection resolved. The problem is that a face mask and a respirator are not the same, and that confusion — though it may seem minor — can be leaving workers without the protection they actually need. Both products cover the nose and mouth. Visually, they may look similar. However, the difference between the two determines whether a worker is genuinely protected against the contaminants in their environment, or only has a cosmetic barrier against a real risk. Face Mask: What It Is and What It Actually Does The face mask, also called a surgical mask, was originally designed for medical environments. Its main function is to contain the large respiratory droplets emitted by the wearer, thereby protecting others. Secondarily, it offers some barrier against large splashes and droplets from outside. What the face mask does not do is seal against the face. Its fit is loose by design, which allows air — and the fine particles or aerosols it may contain — to enter and exit through the sides without passing through the filtering material. Surgical masks are not respiratory protection devices, unlike respirators, precisely for this reason. They are not designed or certified to protect the wearer against industrial contaminants suspended in the air. Respirator: What Makes It Different A respirator, on the other hand, is specifically designed to reduce the user’s exposure to particles or gases through a tight seal against the face and a certified filtering medium. The key difference is not just the material, but the fit: when properly fitted and verified, only minimal leakage occurs around the edges, ensuring that the inhaled air actually passes through the filter. In Mexico, respirators against harmful particles are regulated by NOM-116-STPS-2009, which establishes the characteristics, minimum requirements, and test methods these devices must meet. A product that does not comply with this standard — or with equivalent international standards such as NIOSH N95 or EN149 — cannot be considered certified respiratory protection, regardless of how it is marketed or what it looks like. The Difference in Numbers A properly fitted N95 respirator filters at least 95% of airborne particles, including small particles and aerosols. A conventional face mask, on the other hand, may block large splashes and droplets, but does not provide reliable protection against aerosol particles, precisely because of the loose fit between the mask and the face. This difference is not a minor technical nuance. In an environment with metal dust, welding fumes, paint mists, or fine process particles, a face mask can give the worker — and the company — a false sense of compliance, while actual exposure continues unchecked. When to Use Each One The face mask has its place, but that place is not industrial respiratory protection. It is suitable for general hygiene contexts, biosecurity control in administrative areas, or as a courtesy measure in shared spaces. It does not replace respiratory PPE in any position where real exposure to airborne contaminants exists. The respirator is the correct equipment when there is exposure to dust, fumes, mists, organic vapors, or gases at concentrations that pose a risk to respiratory health. LICA offers different certified options depending on the level of protection required: the CHML10 mask, N95 for solid particles with three-layer construction, for exposure to dust and metal fumes; the CHML11, with exhalation valve and FFP2 NR classification, for greater comfort during long shifts; and the CHRL200 half-face respirator, compatible with the CHF03 cartridge for organic vapor and acid gases, when the risk is not just particles but chemical contaminants in gaseous phase. What the Confusion Costs the Company Beyond the direct risk to worker health, providing face masks where the standard requires a certified respirator represents a concrete legal exposure. NOM-017-STPS-2024 requires employers to select PPE based on the real risk of the position and to have verifiable certification from an accredited body. In the event of a STPS inspection, a face mask provided as a substitute for certified respiratory protection does not meet this requirement, and the company is exposed to sanctions. In the case of a respiratory occupational illness, the legal exposure is even greater. For distributors, this confusion is also an opportunity for advisory sales. A client who understands the difference between the two products makes better purchasing decisions, reduces their regulatory risk, and trusts the supplier who explained the difference before it became a problem. How to Verify Real Respiratory Protection Is Being Used Before assuming a position is covered, it is worth checking three things: whether the product provided has visible NOM, NIOSH, or EN certification on the packaging; whether the design includes an adjustable facial sealing mechanism, not just loose elastic bands; and whether the filter type corresponds to the actual contaminant present — particles, organic vapors, or both. At LICA, we offer a complete line of certified respiratory protection — from N95 and FFP2 filtering masks to half-face respirators and full-face masks with specific cartridges — available for companies and distributors throughout Mexico. Because the difference between a face mask and a respirator is not a matter of appearance: it is the difference between complying on paper and truly protecting. Want to verify whether the respiratory protection your personnel use meets NOM-116-STPS-2009 requirements? Contact us or browse our complete respiratory protection line. Sources: Mexican Social Security Institute (IMSS) — Face Masks: What You Need to Know, 2021 Ministry of Labor and Social Welfare (STPS) — NOM-116-STPS-2009, Air-purifying respirators against harmful particles STPS — NOM-017-STPS-2024, Personal Protective Equipment Moldex — Technical comparison between respirators and surgical masks U.S. Food and Drug Administration (FDA) — Differences between masks and N95 respirators

The air in a workplace can contain hazards that are not always visible. Fine dust, organic vapors, acid gases, or paint mist can be present without the worker noticing right away, yet still cause cumulative respiratory damage with every shift. Choosing correct respiratory protection based on the contaminant present is not a minor detail — it is the difference between healthy lungs after years of work and an occupational illness that shows up when it is already too late. Unlike a mechanical injury, respiratory damage tends to be silent and progressive. For that reason, equipment selection cannot be based on assumptions. It must start with a real analysis of the contaminant present at each job position. What Mexican Regulations Require In Mexico, NOM-116-STPS-2009 establishes the characteristics, minimum requirements, and test methods that negative-pressure air-purifying respirators against harmful particles must meet when manufactured, sold, or imported into the country. This standard applies specifically to masks and respirators designed to filter dust, metal fumes, and mists present in the work environment. As a general framework, NOM-017-STPS-2024, in force since September 2025, requires employers to identify the risks of each position, select the corresponding PPE with verifiable certification, train personnel on correct use, and maintain documented records of delivery and replacement. For respiratory protection, this means it is not enough to simply “hand out masks” — employers must provide the correct mask or respirator for the specific contaminant each worker is exposed to. Respiratory Protection by Contaminant Type Low-toxicity solid particlesPresent in activities such as sanding, wood cutting, cement handling, or industrial sweeping. For this risk, disposable filtering masks are the appropriate option. LICA’s CHML10 model is an N95 mask for solid particles, with three-layer construction and staple-free elastic straps, designed to filter fine non-oily particles with certified efficiency. For shifts requiring greater breathing comfort, the CHML11 model incorporates an exhalation valve, with FFP2 NR classification, making it easier to release warm air and humidity without compromising intake filtration. Industrial dust in intermittent tasksFor activities where dust exposure is not continuous throughout the shift — cleaning, maintenance, occasional cutting work — LICA’s CHML09 model, a foldable particulate mask made from white polyester with elastic fit and EN149 certification, offers a practical and portable alternative. Its foldable design makes it easy to carry and store between uses, making it ideal as a backup available at the workstation. Organic vapors and acid gasesPresent in industrial painting, solvent use, chemical cleaning processes, and certain welding operations. Unlike particles, vapors and gases are not filtered mechanically — they require a chemical adsorption medium. For this risk, LICA offers the CHRL200 half-face respirator, made of elastomer with an ergonomic design, compatible with the CHF03 cartridge, classified A1E1, specific for organic vapor and acid gases. This combination is suitable for workers exposed to solvents, inks, industrial adhesives, or certain chemical processes. High-risk combined exposureWhen the work environment presents multiple simultaneous contaminants — particles, vapors, and possible contact with contaminated surfaces — or when complete facial protection is required in addition to respiratory protection, the full-face mask is the appropriate solution. LICA’s CHRL6800 model, made of silicone with an airtight facial seal, protects both the respiratory tract and the eyes simultaneously, and is compatible with specific cartridges depending on the contaminant present. It is the recommended option for processes with higher contaminant concentration or where the risk also involves eye irritation. Factors That Determine Selection Beyond the Contaminant Contaminant concentration. Occasional low-concentration exposure is not the same as a saturated environment. Higher concentration requires a higher protection factor, which may mean moving from a filtering mask to a respirator with cartridge, or even to supplied-air equipment in extreme cases. Exposure time. Prolonged shifts of continuous exposure require equipment with greater filtration capacity and, frequently, greater comfort for sustained use. A disposable mask intended for occasional use is not suitable for eight hours a day of constant exposure. Compatibility with other PPE. In positions that also require safety glasses or hard hats, it is important to verify that the selected respirator does not compromise the facial seal or interfere with other equipment. The full-face mask resolves this point by integrating eye and respiratory protection into a single piece. Facial fit. A respirator that does not seal correctly against the face loses much of its effectiveness, no matter how good the filter’s certification is. The standard requires that fit be verified individually, since face shape varies among workers. What Many Companies Overlook A common mistake is assuming that any mask protects against any contaminant. An N95 mask, certified for solid particles, offers no protection against organic vapors or gases. Likewise, an organic vapor cartridge does not filter coarse solid particles without the corresponding prefilter. The compatibility between the type of threat and the filtration mechanism is non-negotiable. At LICA, we offer a complete line of respiratory protection — from N95 and FFP2 disposable masks to half-face respirators and full-face masks with specific cartridges — designed to cover the main respiratory risks of Mexican industry. All available for companies and distributors throughout the country. Choosing correctly is not just a regulatory obligation. It is protecting something that, once damaged, cannot always be recovered. Need guidance on selecting the correct respiratory protection based on your plant’s contaminants? Contact us or browse our complete respiratory protection line. Sources: Ministry of Labor and Social Welfare (STPS) — NOM-116-STPS-2009, Air-purifying respirators against harmful particles STPS — NOM-017-STPS-2024, Personal Protective Equipment NYCE — Respirator certification under NOM-116-STPS-2009 IMSS — Occupational disease statistics, respiratory exposure, 2023