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08/Apr/2021
Updated comprehensive overview about flame retardants available
The article about flame retardants in ULLMANN'
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07/Dec/2020
During "European Fire Safety Week" Pinfa informs about fire safety for e-mobility
As in previous months, conferences and information
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13/Nov/2020
RoHS and potential additional flame-retardant bans in Europe
  In the past, the growing amount of elect
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09/Oct/2020
Electronics Goes Green 2020+ brings together participants from the "green electronics sector" online
Despite the continuing corona crisis, conferences
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26/May/2020
US EPA - Current risk assessment and consultation for a chlorinated alkylphosphate ester, triphenylphosphate and tetrabromo-bisphenol-A
Chemicals, and thus also flame retardants, are inc
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06/Jan/2020
Pinfa China E&E workshop addresses fast growing 5G technology
November 21, 2019, Shanghai. Pinfa China succes
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Mode of action

 

Flame retardants may slow down or even interrupt the combustion process by physical or chemical action in the solid, liquid or gas phase. They interfere during heating, decomposition, ignition or flame spread with the course of the fire. The most important processes are:

  • Physical action by cooling (endothermic process of FR decomposition) or diluting the substrate in the gas phase (i.e. formation of water) and the solid phase (alumina trihydrate and magnesium hydroxide), or by coating the substrate (shielding it against the attack of oxygen and heat) with phosphorous and nitrogen compounds.

  • Chemical action in the gas phase interferes with the combustion processes by eliminating the high energy H and OH radicals by halogen halides from halogenated flame retardants, metal halogen compounds from antimony trioxide, and phosphorous-containing fragments from phosphorous flame retardants (“flame poisoning”).

In the solid phase, the flame retardant forms a carbonaceous layer on the surface of the polymer by dehydration, formation of double bonds, thus initiating cyclization and cross-linking (phosphorous, nitrogen compounds, intumescent systems).