Description

Useful Combination

At a minimum, NFPA 70E allows ATPV values for each individual layer to be added together when layering FR garments to reach the required ATPV rating for each hazard/risk category: (In actual testing, layered FR garments regularly achieve higher ATPV ratings than the simple sum of their individual ratings thanks to air gaps and other factors. But because actually quantifying this behavior requires testing and certification of each specific set of layers, it’s best to simply be conservative and go with the basic sum-of-the-layers ATPV rating when evaluating layered FR work wear. One potential example of layered FR is a worker in a pair of canvas dungarees (ATPV 15.7) and an FR twill shirt (ATPV 8.6). Together with appropriate underwear, footwear, and gloves, this outfit meets HRC 2 specifications. With the addition of canvas bib overalls (ATPV 16.0) and a midweight sweatshirt (ATPV 21.8), this worker now surpasses HRC 3 requirements. Another worker could start with denim jeans (ATPV 25.0) and a mock turtleneck (10.9) at HRC 2 and add the sweatshirt alone to achieve HRC 3 compliance. Another versatile clothing option for worker comfort and standards compliance is the vest, which can be paired with FR sleeves to provide up to HRC 4 compliance in hazard areas but can be worn unzipped in non-hazard environments for increased comfort. In regions and seasons with rapidly changing weather conditions, vests provide significant flexibility under coats, over sweatshirts, or over shirts to combine protection with comfort throughout the day.

Consist of following Layers

  • 1st Layer: 205 GSM Nomex®
  • 2nd Layer: 170 GSM Nomex® Non-Woven Fabric
  • 3rd Layer: 280 GSM 100% Cotton Fire Retardant Arc Rating 39 cal/cm Protection
 HRC  ATPV
 1  4
 2  6
 3  25
 4  40

Features

Fabric Features

Dupont®  Nomex® aramid (93% Nomex® -5% Kevlar® -2% Carbon).

Application

Characteristics

Inherently flame resistant anti-static fabric engineered to reduce “nuisance” static. Self-extinguishing, will not ignite, melt, drip or burn. These characteristics make Nomex® an exceptional all around fabric for applications such as petroleum refining, petrochemical, fire service, and gas and electric utilities.

Important

NFPA 70E Does not have a hazard risk category above 40 cal/cm2. Working on levels above this rating should be avoided because of the blast hazards caused by arc flash.