The Sir garments of the Polytech and Polytech Plus Ranges can guarantee maximum protection from the risks of an electric arc. This is possible without sacrificing softness, breathability and comfort.
Resistance to an electric arc of the Polytech Plus Range is quantified by the ATPV value (Arc Thermal Performance Value), determined according to the IEC EN 61482-1-1/method A standard.
ATPV is the maximum thermal energy, incident in units of energy per surface, which a fabric can withstand before the worker suffers second-degree burns. In the case of the Polytech Plus Range, the value is 21.9 cal/m2, which is among the highest on the market.
Another method to measure the protective performance of a garment from the thermal effects of an electric arc is the closed arc test set forth in the IEC EN 61482-1-2 standard.
During this test the fabric is exposed to an electric arc generated in a very confined environment, directed by an extremely specific casing and with a particular arrangement of the electrodes.
The essential criterion that a fabric must fulfil to pass the Class 1 (4 kA) or Class 2 (7 kA) test is to prevent the heat that is transferred through the fabric during the test from causing second-degree burns. The Polytech Plus Range has also been tested according to this standard, passing the test in Class 2 (7kA). Guaranteed protection of Polytech clothing lies in the fabric, the fibres of which are intrinsically fireproof, a feature that does not disappear even with washing and wear.
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