Garments made of inherently flame resistant fibers

Care & Cleaning Information for Garments Made from Blends of Inherently Flame Resistant Fibers

These garments are made from fabrics that are heat resistant and permanently flame resistant. Inherently flame resistant fibers are blended with modacrylic, rayon, nylon and other fibers. The fabrics may also incorporate fibers that are antistatic or have other characteristics. Regardless of the blend, in static-sensitive environments proper grounding procedures must be observed.

Any flame resistant garments should be removed immediately and replaced with clean FR apparel if they become fouled with flammable material.

These garments should be washed using soft water (less than 4.0 grains). Hard water adversely affects cleaning, resulting in increased detergent usage. Hard water contains mineral salts that can form insoluble deposits on the surface of fabrics. Sufficient buildup can negate the flame resistant characteristics of the garment, and may serve as fuel if garments are exposed to an ignition source.

Laundry temperatures up to 140°F are best for good colorfastness. Processing in hotter formulas may be required to remove soils but could affect color and shrinkage. These garments can also be dry cleaned in perchloroethylene or petroleum.

Important considerations are temperature control in washing and drying and removing flammable soils or chemicals that can overwhelm or mask the FR properties.

  • Process separately from other types of garments throughout the entire operation to prevent accumulation of lint and minimize pilling.
  • Sort by shade to reduce staining or color transfer which may occur.
  • Use low temperature (140°F max.), low alkalinity surfactant chemistry for water washing. Higher pH products and elevated wash temperatures accelerate color loss.
  • Washing at hotter temperatures and higher levels of alkalinity may be necessary to remove soils. This will not damage the fabric or degrade the FR properties but may affect color. Removing flammable soils is more important than color retention.
  • Use a multiple add procedure (break and second suds) where necessary due to soil levels.
  • Do not use chlorine bleach. This will weaken the fabric and accelerate color loss. Use of oxygen bleach is acceptable where necessary. Do not use starch or fabric softeners as they can coat fibers and mask FR performance and/or serve as fuel in the event of garment ignition.
  • Temperature step-downs between baths should not exceed 15°F. Cool to 100°F or less before extraction to minimize wrinkling.
  • Rinse well and sour properly.
  • Short extraction at low levels should be sufficient and will help reduce wrinkling improving finished appearance.
  • Condition at 140°-160°F stack temperature so fabric temperatures measured in the basket do not exceed 280°F. This fabric will dry rapidly. Do not over dry. Excessive heat will cause color loss. Cool down to 100°F or less and remove promptly from the dryer.
  • Shrinkage similar to 100% cotton fabrics can be expected.
  • Tunnel finishing will improve fabric smoothness but may cause hanger impressions. If creases in pants are desired, pressing will be required. Do not exceed 280°F fabric temperature.
  • Wash and dry separately to prevent accumulation of lint.
  • Pre-treat greasy stains and do not overload the washer to help insure removal of soils.
  • Wash in hot water (up to 140ºF) using any typical home laundry detergent. Do not use tallow soap.
  • Do not use chlorine bleach. Do not use starch or fabric softeners as they may coat fibers and mask FR performance and/or serve as fuel in the event of garment ignition.
  • Do not over dry.
  • For maximum flame resistance, greases and oils must be thoroughly removed. If home procedures do not accomplish this, commercial laundering or dry cleaning is recommended.

Either perchloroethylene or petroleum solvent can be used. In cases of heavy, oily soil, this may be the preferred approach. With petroleum, it is necessary to ensure all solvent has been completely dried from the garment.


Minor repairs that do not affect the integrity of the garment should be made with like materials by sewing on patches or darning small holes.

The information in this bulletin is based on the results of testing in our laboratory and information from the fabric vendor. It is provided for your guidance and knowledge. As of the publication date, this bulletin contains up to date information on care and cleaning. Please visit our website at for the latest information.

YouTube Channel

Contact Bulwark

How flame-resistant fabrics work

Flame-resistant (FR) fabrics and garments are intended to resist ignition, prevent the spread of flames away from the immediate area of high heat impingement, and to self-extinguish almost immediately upon removal of the ignition source.

Normal work apparel will ignite and continue to burn if exposed to an ignition source such as flame or electric arc. Everyday fabrics will continue to burn until they are extinguished or all flammable material is consumed.