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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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04/Aug/2017
Recycling of plastic waste - curse or a blessing?
In our fast-paced „throwaway society“
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31/May/2017
Plastics for E&E applications, “fuse box meets dryer” 2017 in Würzburg
As in previous years „Kunststoffzentrum (SKZ
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01/Aug/2016
pinfa's first workshop in China confirms interest in halogen free FRs
In June 2016, over 250 people from academia, indus
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02/Nov/2015
1st International Asia-Oceania Symposium on Fire Safety Materials Science and Engineering (AOFSM’1 2015)
The 1st International Asia-Oceania Symposium on Fi
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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.