POLYPHLOX® FLAME RETARDANTS

HALOGEN-FREE REACTIVE FLAME RETARDANT FOR EPOXY, POLYESTER AND POLYURETHANE RESINS

Due to their versatility and excellent properties, reactive resin systems are used in a wide range of applications, such as transportation (shipping, rail, aviation). In order to meet the fire protection requirements applicable in the respective fields of application, flame retardants must be added to the resin systems.

STRUKTOL® POLYPHLOX® flame retardants offer numerous advantages in use:

  • halogen-free,
  • toxicologically harmless in case of fire,
  • reactive organophosphorus compound with high phosphorus content
  • chemically incorporated in resin matrix.

The high organic phosphorus content and the chemical integration in the cured epoxy resin system significantly reduce flammability and smoke density, that no full scale fire occurs and there is sufficient time for escape. Optimum property profiles with regard to fire protection requirements and other product properties can be achieved via the added quantity of POLYPHLOX® modifier. To further increase the performance of our POLYPHLOX® modifiers, additional synergists can be added.

Reactive flame retardants based on phosphorous-organic compounds such as DOPO are a very effective and toxicologically safe alternative to halogen-containing flame retardants.

STRUKTOL® POLYPHLOX® products are chemically pre-treated so that they later react with the matrix in epoxy resin systems. This has little effect on the mechanical and chemical properties of the cured EP matrix, so that for many applications the respective optimum property profile and good fire protection (e.g. UL94 V0) can be achieved.

The products can often be combined well with synergists such as APP, melamine cyanurates or ATH, so that the fire protection effect can be further enhanced.

Struktol® Polyphlox® 3700

Hydroxy functional phosphoric co-monomers

  • Dyn. viscosity at 25 °C: 125 Pa.s
  • Phosphorous Content: 5 %
  • Hydroxyl number: 185 mgKoH/g
Struktol® Polyphlox® 3710

DOPO-9, 10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide

  • Halogene-free
  • Toxicologically harmless
  • Hydrogen-functional organophosphorous
  • compound
  • Melting point: 116 °C
  • Phosphorous Content: 14.3 %
  • Appearance: white flakes

The DOPO structure can also act as an UV-stabilizer

Struktol® Polyphlox® 3735

Multi-functional, organophosphorous modified epoxy Novolak resin (based on Struktol® Polyphlox® 3710)

  • Epoxy equivalent weight: 350 g/Eq
  • Softening point: 80 °C
  • Phosphorous Content: 3.8 %
  • Appearance: transparent – yellowish solid resin
Struktol® Polyphlox® 3742

Multifunctional, organophosphorus modified epoxy resin (based on Struktol® Polyphlox® 3710)

  • Halogen-free flame retardant especially suitable for prepregs and composite materials, e.g. in aerospace and transportation
  • DOPO (Polyphlox® 3710) modified epoxy resin
  • Epoxy equivalent weight: 370 g/Eq
  • Softening point: 57 °C
  • phosphorus content: 4.0 %
  • appearance: yellowish, semi-solid resin
Struktol® Polyphlox® 3743

Multifunctional, organophosphorus modified epoxy resin (based on Struktol® Polyphlox® 3710)

  • Halogen-free flame retardant especially suitable for prepregs and composite materials, e.g. in aerospace and transportation
  • DOPO (Polyphlox® 3710) modified epoxy resin
  • Epoxy equivalent weight: 350 g/Eq
  • Dyn. viscosity (80 °C): 13 Pa.s
  • Phosphorus content: 4.0 %
  • Appearance: yellowish, semi-solid resin
Struktol® Polyphlox® 3775 LV

Multifunctional, organophosphorus modified epoxy resin (based on Struktol® Polyphlox® 3710) with high phosphorus content
diluted with low viscosity epoxy resin

  • Reactive, flame retardant epoxy resin (e.g. to meet UL-94 V0)
  • For formulation of epoxy resin systems in applications like powder coating, prepregs and composite materials
  • DOPO (Polyphlox® 3710) modified epoxy resin
  • Epoxy equivalent weight: 330 g/Eq
  • Dyn. viscosity (80 °C): 5.5 Pa.s
  • Phosphorus content: 4.0 %
  • Appearance: yellowish, semi-solid resin, diluted with low viscosity epoxy resin
Struktol® Polyphlox® 3721

Flame retardant epoxy resin formulation with very high phosphorous content
UL94 V0 achievable

  • low viscous, flame retardant epoxy resin formulation  
  • for processing by hand lamination or RTM
  • APP-modified epoxy resin
  • Epoxy equivalent weight: 240 g/Eq
  • Dyn. viscosity (25 °C): 3 Pa.s
  • Phosphorus content: 5.1 %.
  • Appearance: whitish, opaque resin
  • suitable Polyvertec® hardeners: H4, H6, H7, H81
Struktol® Polyphlox® 3722

Flame retardant epoxy resin formulation with high phosphorus content
UL94 V0 compliant

  • medium viscous, flame retardant epoxy resin formulation  
  • for processing in hand laminate or infusion/injection process
  • DOPO- (Polyphlox® 3710) and APP modified epoxy resin
  • Epoxy equivalent weight: 215 g/Eq
  • Dyn. viscosity (25 °C): 12 Pa.s
  • phosphorus content: 4.2 %.
  • Appearance: whitish, opaque resin
  • suitable Polyvertec® hardeners: H4, H6, H7, H81