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15/Oct/2018
"Polyurethanes Technical Conference" shows more sustainable alternatives for polyurethane industry
On 1 - 3 October 2018, the 61st annual "Polyu
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12/Oct/2018
Conference "Fires in Vehicles"​ reveals that fire safety still needs to be improved in busses and electric cars
On 3 and 4 October 2018, the 5th biannual "Fi
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14/Aug/2018
New article on Recycling of Halogen-Free Flame-Retardant Plastics
Kunststoffe international 2018/08, PAGE 39 –
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23/Jan/2018
AMIs „Fire Resistance in Plastics“, 2017
The 12th international Fire Resistance in Plastics
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06/Oct/2017
Fraunhofer LBFs and PINFAs research activities on the recycling of plastics containing halogen free flame retardants
Recycling is an important issue with regard to the
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01/Sep/2017
New pinfa video: How effective are flame retardants for fire safety?
A new video from PINFA, the Phosphorus, Inorganic
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Inorganic

Mode of action: Depending on the flame retardant, cooling of the polymer, dilution of the substrate and of the combustion gases (ATH, MDH), or formation of a charred layer (Zn borate, exp.C, Nanocomposites), as well as synergism (ATO, AlOOH) may take pla

The most important flame retardants, which are also used as fillers, are aluminum trihydrate (ATH) and magnesium hydroxide (MDH). In addition, antimony trioxide (ATO) is used in large quantities as a synergist with halogenated flame retardants and PVC. Aluminum oxide hydrate (AlOOH or Boehmite) also acts as a synergist in conjunction with metal phosphinates.


Metal hydroxides


Aluminum hydroxide or aluminum trihydrate (ATH) already decomposes at around 200 °C.


Therefore, it only can be used with plastics processed at lower temperatures such as PVC, polyethylene, ethylene/vinyl acetate-copolymers and thermosets.


Aluminum oxide hydrate (AlooH) or Boehmite decomposes at 320 °C. It can therefore be used in engineering thermoplastics and is synergistic with metal phosphinates. It iss also used in printed circuit boards.



Magnesium hydroxide (MDH) decomposes at around 300 °C.


Its main applications are polypropylene, polyamides and wire & cable.


Zinc compounds


Zinc borate may partly substitute antimony trioxide in thermoplastics, inhibits afterglow and acts as a smoke suppressant. 4ZnO . B2O3 .H2O, which decomposes at 415 °C, is suitable for engineering plastics.


Zinc hydroxystannate is used as a smoke suppressant for PVC, unsaturated polyesters and elastomers.