ArcWear™ Sentinel™ 4500 Series Data

Electric Arc Resistance

ASTM F1891-02b Standard Specification for Arc and Flame Resistant Rainwear


This specification establishes applicable test methods, minimum physical and thermal performance requirements, suggested sizing and recommended purchasing information for rainwear for use by workers who may be exposed to the thermal hazards of momentary electric arcs and open flames. The objective of this specification is to prescribe fit, function and performance criteria for rainwear that meets a minimum level of thermal and physical performance when exposed to a laboratory-simulated electric arc or flame exposure.

Key Definitions

  • Arc Rating: a term used to indicate the protection level of a garment. With rainwear, it is invariably equal to the ATPV.

  • Arc Thermal Performance Value (ATPV): the incident energy on a material that results in sufficient heat transfer through the material for a 50% probability of the onset of a second-degree burn injury.

  • Calorie: is the energy required to raise one gram of water one degree C.

  • Design Test: one made on a sample treated as representative of an individual product, which is not intended to be re-done unless components of the material change.

  • Energy Break-open Threshold (Ebt): the amount of energy needed to cause the material to break-open.

  • Heat Attenuation Factor (HAF): the percent of arc flash heat energy blocked by the material.

Performance Requirements

  • Material must be flame retardant (ASTM D6413), self-extinguish < 2 seconds, < 6” char length.

  • Must determine Arc Rating (ASTM F1959) – report results, no minimum required.

  • Must determine Heat Attenuation Factor (ASTM F1959) – report results, no minimum required.

  • Must determine Energy Break-open Threshold (ASTM F1959) – report results, minimum of 5 cal/cm2.

  • Must not melt, drip or ignite at twice arc rating.


  • NFPA 70E Standard for Electrical Safety Requirements for Employee Workplace, includes codes, standards and recommended practices and guides for safe work practices.

  • Covers protection to workers from electrical hazards associated with installation, maintenance or repair of electrical systems. This standard excludes the transmission and distribution of electric power by utility companies.

  • Requires a work place to conduct a hazard assessment and provide equipment (PPE) based on that assessment. Hazard risk categories have been established to help employers select the proper PPE.


NFPA 70E Hazard Risk Category (HRC) Classification Table


Minimum Arc Rating













ArcWear™ Sentinel™ 4500 Series Protective Outerwear 



Outer Shell

FR Polyurethane Moisture/Chemical Barrier

Inner Layer

100% FR Cotton Knit 

Finished Weight


Seam Construction

Dielectrically Welded with Safety Stitch


Fluorescent Lime Yellow or Fluorescent Orange 

Reflective Trim

3M™ 9720 Scotchlite™ Reflective Material

Electric Arc NFPA 70E 

ASTM F1891

F Lime Yellow: ATPV 14.0 cal/cm2: HAF 87.0%: Ebt 28.0 cal/cm2
F Orange: ATPV 16.0 cal/cm2: HAF 88.0%: Ebt 32.0 cal/cm2


Fluorescent Lime Yellow HRC 2; Fluorescent Orange HRC 2

Flash Fire NFPA 2112 

ASTM F2733

22.40% total body burn


High Visibility

ANSI 107

Fluorescent Lime Yellow and Fluorescent Orange are ANSI 107 Class 3 Level 2 compliant

Chemical Resistance


Resistant to Oils, Hydrocarbons, Salts, Alkalies and Most Alcohols. For a complete list of chemicals tested, please email ArcFlashWear at This email address is being protected from spambots. You need JavaScript enabled to view it.


Flash Fire Resistance

NFPA 2112 Standard on Flame Resistant Garments for Protection of Industrial Personnel Against Flash Fire, and

ASTM F2733 Standard Specification for Flame Resistant Rainwear for Protection Against Flame Hazards


This specification establishes test methods, minimum physical and thermal performance criteria, a suggested sizing guide and suggested purchasing information for rainwear for use by workers who are potentially exposed to industrial hydrocarbon fires or other petrochemical fire hazards.

Performance Requirements

Requirements must be met initially as manufactured as well as after five cleanings.

Tear Resistance

Material must have a trapezoidal resistance of 6 lbs (2.72 kg) in the warp direction and 6 lbs (2.72 kg) in the fill direction.

Markings and Reflective Materials

These material attached to the rainwear must be permanent and must not degrade the performance of the rainwear.

Flame Resistance

Rainwear material must be flame resistant and must not melt and drip when tested in accordance with ASTM D6413 and must exhibit no more than a 2 second afterflame time and less than 6 inch char length.

Thermal Protection

Rainwear must be tested in accordance with ASTM F1930, a design test, after 1 washing and 1 drying. Testing parameters are set at a heat flux of 84 ± 2kW/m2 (2.0 ± 0.05 cal/cm2) and an exposure time of 3 ± 0.1 seconds. The following information is determined:

  • The average predicted total area body burn injury for the three specimens tested must be equal to or less than 40%.

  • Material response characteristics must be reported for all exposures. Characteristics are: afterflame time, energy break-open, charring, melting, dripping, garment ignition, embrittlement and shrinkage. 

Rainwear Construction

Must utilise materials, stitching, tapes, coatings, fasteners and closure materials that minimise heat conduction for the construction of compliant FR rainwear. Fasteners and closures used, for example, zippers, snaps, buttons etc. that are made from metal, must be covered with a layer of rainwear material on the inside of the garment such that these items of construction will not contact undergarments or the skin.

  • Structural seam integrity: seams must not exhibit a seam failure that creates a seam opening of greater than 51mm (2 inches).

  • Closure Function: closures must function (fully open) after the simulated fire exposure. Closures that do not fully open do not meet the performance requirements of this specification. All closures that do not fully open must be reported.

Labelling Requirements

  • Manufacturer Label: states size, catalogue number, manufacturer's name and notation of conformance to ASTM F2733 and the label is permanently affixed in each rainwear item.

  • Statement of Conformance: the statement of conformance to this specification must be, "This rainwear meets or exceeds requirements for ASTM F2733 Standard Specification for Flame Resistant Rainwear for Fire Hazards."

  • Care Label: states instructions for cleaning and care and must be readable throughout the life of the garment.

  • Packaging Label: states name of manufacturer, size, material, catalogue number, date code and ASTM designation.  

Leak Resistance

ASTM F1891-02b

Material must withstand water pressure of 30 psig without leaking. The seams of the rainwear must not exhibit any evidence of leakage when exposed to water at 3 psig for two (2) minutes.