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Polyester Spinning Flame Retardant Zinc Diethyl Hypophosphite CAS:284685-45-6

  • FR-ZDP

  • 284685-45-6

  • 20-21

  • <40

  • >350

  • Polyester Spinning



FR-ZDP is an organic zinc phosphinate-based flame retardant that comes in the form of a white powder. It melts at high temperatures, which helps with the melt-blending process of flame retardants and polymers, preventing clogging of spinnerets. It is especially useful for PET fiber fabrics and PET film systems that require halogen-free flame retardancy. 

FR-ZDP is an organic zinc phosphinate-based flame retardant that offers several advantages. It has high temperature resistance, which means it can withstand high temperatures without losing its effectiveness. Additionally, it does not migrate, ensuring that it stays in place and continues to provide protection. FR-ZDP also has good compatibility with resins, allowing it to be easily incorporated into various materials. These properties make FR-ZDP a reliable and effective flame retardant for a variety of applications.

Typical Properties 

Physical PropertiesUnitTarget Value
Phosphorus Content% (w/w)20.5
Melting Temperature 210
Bulk Densityg/cm31.40
Decomposition Temperature (at 2% weight loss)350


Ø  In permanent flame-retardant polyester products:

FR-ZDP is an effective flame retardant that can be used in the production of polyester chips, filaments, staple fibers, and films. The resulting flame-retardant polyester chips have desirable properties such as good color, spinnability, fiber strength, and dyeability. FR-ZDP is particularly effective at providing flame retardancy for polyester and can be used in both injection molding and fiber applications.

 Ø  In PET:

By adding 3% of FR-ZDP to a PET compound, the limiting oxygen index (LOI) of the flame-retardant PET can exceed 30%.

Ø  In PBT:

By adding 10-15% of FR-ZDP and 10-15% of nitrogen-based flame retardants, such as melamine polyphosphate (MPP) or melamine cyanurate (MCA), to electrical compounds, it is usually possible to achieve a UL 94 V-0 classification at thicknesses of 1.6mm and 0.8mm.

Packaging & Storage

Ÿ   Packaged in a paper-plastic composite bag and lined with a plastic bag. 25 kg per package.

Ÿ   The product must be sealed, kept dry, dust-free, and cool. 

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