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Home / Articles and Press Releases / Press Release / Are Your Flame Retardant Clothes Arc Resistant?

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Press Release

Are Your Flame Retardant Clothes Arc Resistant?

By Charnaud

| Read Bio

Published: September 25th, 2017

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The letters “AR” stand for Arc Rated and the letters “FR” stand for flame resistant, ALL AR clothing is flame resistant (FR), but not all FR clothing has been Arc Rated.

The official Arc rating standard is ASTM 1959 (US) or EN 61482-1-1 (European) which requires fabrics to be FR and tested. To comply with the ASTM 1959 (US) or EN 61482-1-1 standards, 21 samples have to be subjected to arc flashes in a certified laboratory, where sensors measure the heat transfer through the fabric.

A calculation based on the Stoll curve modelling then predicts whether or not a second-degree burn would have resulted. The model calculates the energy likely to cause a second-degree burn through that fabric 50% of the time. This number is expressed in calories and then becomes the arc rating for that fabric and any garment made from it.

The arc rating measures insulation of FR fabrics to an arc flash. The arc rating can be reported as ATPV (Arc Thermal Performance Value) or Ebt (Energy Break open threshold) – the higher the value, the more protection the material offers.

All AR garments must have an internal label and external label which clearly indicates the HRC (Hazard Risk Category) and the ATPV or the EBT value that the garment has been tested and approved for. The HRC enables the user to identify the risk category of the work that needs to be completed and the required Arc Rating of their clothing to ensure that they are adequately protected. It is critical that the worker is covered from “head to foot” with the correct rated and tested PPE and PPC to ensure their safety.

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ABOUT THE AUTHOR

Charnaud

CHARNAUD was founded in 1975 by Fiona and Andrew Charnaud to manufacture industrial rainwear for the South African market. The organisation has since expanded its range considerably and now supplies advanced personal protective clothing in head to foot ranges to various sectors of the global economy. These include: Firefighting, Smetlers, Mining, Oil & Gas, Utilities, and Petrolchemical industries. CHARNAUD have been involved in the hot-metal market since 1978, and in the primary aluminium smelter market since 1999. In 2005, CHARNAUD launched a range of head to foot products to protect workers against the thermal effects of electric arc flash. CHARNAUD is regarded as a leading global supplier of certified head to foot personal protective clothing products, and is committed to the protection and safety of its customers.

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