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Fyrolflex® RDP

Fyrolflex® RDP is an oligomeric phosphate ester flame retardant that is designed for use in engineered resin applications such as polyphenylene oxide alloys and PC/ABS.

Due to its low volatility and high heat stability, this non-halogen flame retardant can tolerate high temperature processing required of many engineered resins. In addition to its FR characteristics, Fyrolflex® RDP demonstrates improved processing characteristics in a number of thermoplastics, including ABS and HIPS, which benefits designs like thin wall moldings and other high-performance, high flow plastic applications.

Compared to other non-halogen FRs (phosphate esters), Fyrolflex® RDP is relatively stable with low volatility, well within the processing parameters of most engineered plastics (onset decomposition +300° C).

CAS Number


Key Benefits

  • Has an advantage over other bis-phosphates due to its low viscosity, which allows for ease of handling and better and safer management of resources (lower heat storage)
  • As the reason to use flame retardants is to effect flame retardancy, Fyrolflex® RDP, on a pound for pound basis, has a higher phosphorus content than bis-phenol A bis phosphates which means lower use levels.


Specific Gravity
Phosphorus Content
Viscosity mPa.s - 25°C
TGA %WT. Loss @ Temp.
2% @ 285°C 5% @ 320°C 10% @ 335°C

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