How to Wash Nomex Clothing Safely at Work

Nomex garments do not lose their flame-resistant properties the way treated FR fabrics can, but poor laundering can still create a serious problem. Oil, grease, flammable residues, fabric softener, and improper wash practices can reduce the garment’s protection or make it unsuitable for continued wear. Knowing how to wash Nomex clothing correctly is part of maintaining dependable PPE, not simply keeping workwear clean.

For individual workers and uniform programs, start with the garment’s care label. The label and the manufacturer’s laundering instructions take priority because Nomex may be blended with other fibers, high-visibility material, reflective trim, or specialty components with different care limits.

Why Nomex laundry procedures matter

Nomex is an inherently flame-resistant fiber. Its protective properties are built into the fiber itself rather than applied as a surface treatment. That is an advantage in high-heat, flash-fire, and electrical work environments, but it does not mean the garment is maintenance-free.

Combustible contamination can ignite or transfer heat to the wearer. Heavy deposits of hydraulic fluid, petroleum products, solvents, grease, or other flammable substances can also prevent a garment from being cleaned effectively in a normal home washer. A dirty FR garment may look serviceable while carrying a hazard that is not visible at a distance.

Laundering is also not a substitute for inspection. Check garments before and after washing for holes, worn cuffs, broken closures, damaged reflective striping, thinning fabric, permanent staining, and contamination that remains after cleaning. Retire or replace clothing that cannot be restored to a safe condition under your company’s PPE program.

How to wash Nomex clothing in a standard washer

For normally soiled Nomex coveralls, shirts, pants, and hoods, use a conventional wash cycle with warm water and a standard heavy-duty laundry detergent. Turn garments inside out when practical, fasten zippers and snaps, and empty pockets before loading. This reduces abrasion and helps prevent metal hardware from damaging other items.

Wash Nomex clothing separately from regular household laundry, especially from items that shed lint or carry oils and residues. Do not wash it with garments contaminated by flammable liquids. Keep FR workwear loads reasonably sized so water and detergent can circulate through the fabric instead of trapping soil in folds and seams.

Use the wash temperature stated on the care label. Warm water is commonly suitable for workwear soil, while hotter water may be allowed on some garments. Excessive heat is not automatically better. It can set stains, increase shrinkage in blended fabrics, and shorten the service life of components such as reflective tape or elasticized sections.

Choose detergent carefully

Use a regular liquid or powder detergent that does not contain added softeners. The goal is to remove soil without leaving a coating on the fabric. Measure detergent according to the load size, water hardness, and degree of soil. Too little detergent may leave oil behind; too much can leave residue that requires additional rinsing.

Avoid soap-based products when possible. Soap can react with minerals in hard water and leave deposits that reduce cleaning performance. If your facility has hard water, a water conditioner or detergent designed for hard water may help, provided it is compatible with the garment manufacturer’s instructions.

Products to avoid

Do not use chlorine bleach on Nomex clothing. Chlorine bleach can damage fibers, affect garment color, and reduce the useful life of the garment. Avoid fabric softener sheets and liquid fabric softeners as well. These products can leave a surface film that may affect moisture management, soil release, and thermal performance.

Also avoid starch, sizing, dryer sheets, and products marketed to add fragrance or softness. These are not necessary for protective workwear and can leave unwanted residues. Do not use solvent spot removers or gasoline-based cleaners on FR garments.

Drying Nomex workwear without unnecessary damage

After washing, tumble dry according to the care label, usually on a low or medium setting. Remove garments promptly when dry to limit wrinkling and excess heat exposure. Overdrying does not improve cleanliness and can contribute to shrinkage, fading, and premature wear.

If the label allows line drying, it is a practical option for preserving garment life. Keep garments away from direct contamination sources while drying. Do not place Nomex workwear on heaters, radiators, or other high-temperature surfaces.

Ironing is usually unnecessary, but if needed, use the temperature listed on the label. Do not iron over reflective striping, printed logos, patches, or heat-applied labels unless the garment instructions specifically permit it.

What to do with oil, fuel, or chemical contamination

A garment heavily contaminated with flammable liquids should not go into a home washing machine. The contamination may not be removed completely, and it can transfer to the washer, other garments, and later loads. Set the garment aside, follow site procedures, and consult the employer, safety manager, or garment service provider.

The correct response depends on the contaminant. Some soils can be removed through controlled industrial laundering; others require the garment to be removed from service. If chemicals are involved, review the safety data sheet and the company’s hazard-control procedure. Never assume that a garment is safe because a stain has faded or an odor has decreased.

For a small, nonflammable stain, pre-treat only if the care instructions allow it. Use a compatible detergent-based pre-treatment rather than solvents, then wash the garment promptly. If the stain remains after laundering, evaluate whether it represents contamination, fabric damage, or only discoloration.

Home laundering versus industrial laundering

Home laundering can be appropriate for lightly to moderately soiled Nomex clothing when workers follow the garment label and the employer’s PPE policy. It gives workers control over turnaround time and can work well for routine utility, construction, manufacturing, and maintenance clothing.

Industrial laundering is often the better choice for larger crews, consistently dirty work, or sites with documented contamination risks. A qualified provider can use controlled wash chemistry, segregate loads, track garments, and maintain a repeatable process. The trade-off is cost and logistics, but for a uniform program or high-hazard operation, consistency can be worth it.

Employers should define who is responsible for laundering, what contamination requires removal from service, and how replacement garments are issued. This prevents workers from making inconsistent decisions after exposure to oils, chemicals, or process residues.

Keep care instructions aligned with the hazard

Nomex may be used in garments selected for flash-fire or arc-flash hazards, but laundering does not establish a compliance rating. The garment must be selected, worn, maintained, and replaced according to the applicable job hazard assessment and program requirements.

For example, NFPA 2112 addresses flame-resistant garments for industrial personnel exposed to flash fire. NFPA 70E and CSA Z462 address electrical safety and arc-flash work practices. CAN/CGSB 155.20 covers workwear for protection against hydrocarbon flash fire and, where specified, steam and hot fluids. These standards address different hazards and should not be treated as interchangeable.

If a garment includes high-visibility features, its visibility performance and care requirements also matter. CSA Z96 applies to high-visibility safety apparel, while its reflective materials may require specific wash and drying limits. Follow the instructions for the complete garment, not only the Nomex fabric.

Common Questions

Can Nomex clothing be washed with regular detergent?

Yes, regular heavy-duty detergent is generally appropriate if it does not include fabric softener or leave a coating behind. Follow the garment label for water temperature, detergent restrictions, and drying instructions.

Can you use bleach on Nomex coveralls?

Do not use chlorine bleach. It can damage the fabric and shorten garment life. If whitening or stain removal is needed, use only products permitted by the garment manufacturer.

How often should Nomex clothing be washed?

Wash it whenever it is dirty, sweaty, or exposed to jobsite soil. Garments with oil, fuel, chemical residue, or heavy contamination need a separate evaluation rather than routine laundry.

Does washing remove Nomex flame resistance?

Normal laundering does not remove the inherent flame resistance of Nomex fiber. However, improper products, garment damage, and combustible contamination can reduce real-world protection. Clean, inspected workwear is the practical standard for every shift.