INDURA® Ultra Soft® – Guaranteed flame resistant fabrics.

indura flame resistant diagram

A comfortable and durable flame resistant fabric from Westex Inc. Millions of garments made from Westex fabrics are in service worldwide in electric and gas utilities, oil, gas, petrochemical, chemical, military, firefighting and ferrous metal industries.

INDURA® Ultra Soft® fabrics are a composition of 88% cotton and 12% high tenacity nylon that has been chemically modified to be permanently flame resistant.

INDURA® Ultra Soft® fabrics:

  • are guaranteed for flame resistance for the life of the garment.
  • are resistant to UV degradation.
  • are breathable and moisture wicking
  • meet the human-ecological requirements of Oeko-Tex® Standard 100 Class II for products worn next to the skin.
  • are proven in testing to industry standards at independent laboratories for protection against Electric Arc Flash, Flash Fire and Molten Metal Splash Exposure (available upon request).


INDURA® Ultra Soft® fabrics are made using Westex’s proprietary treatment process, an ammonia cure of a high quality phosphonium salt precondensate flame retardant chemical to the fabric substrate, penetrating the core of the cotton fibre. This process is not simply a coating of the cotton fibre but a permanent change to the internal structure of it making it permanently fire resistant.

Stringent quality testing is carried out throughout the manufacturing process such that there has never been an instance of failure to meet original FR requirements for garments maintained as specified over their useful life.


INDURA® Ultra Soft® fabrics and are self-extinguishing and pass the vertical flammability test throughout their service life.

Electric arc flashes are dangerous short bursts of intense energy. Everyday workwear is easily ignited at exposure and will continue burning. The standard ASTM F1959, created for protecting electrical workers against electrical arcs, requires the fabrics to be flame resistant (vertical test) and to be given an Electric Arc Rating (ATPV). Click here for test results.

Flash fire exposures are defined as a rapidly moving flame front which can be a combustion explosion…. a flash fire has a heat flux of approximately 84 kW/m2 over relatively short periods of time, typically 3 secs (ref. NFPA 2112). A fabric is tested under standard ASTM F1930 for protection against flash fires by exposing a mannequin to a simulated flash fire. Click here for test results.