FILCO® 661 FPG 005 is a bisphenolic unsaturated polyester resin in powder form. It possesses a very high molecular weight, ensuring superior performance in various applications. This resin exhibits rapid solubility in styrene, facilitating efficient and quick integration into composite systems. Notably, it demonstrates a very high binding power for glass fibers, particularly in "hot melt" operating conditions, enhancing its effectiveness in composite material production. Additionally, FILCO 661 FPG 005 showcases a high degree of compatibility with unsaturated polyester matrices, further solidifying its role as a versatile and seamlessly integrated component in composite manufacturing processes.

Functions: Resins, Binders & Matrix Materials

Chemical Family: Bisphenols, Polyesters

Compatible Polymers & Resins: Unsaturated Polyester (UPE)

Technical Data Sheet

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Identification & Functionality

Chemical Family
Composite Materials Functions

Features & Benefits

Product Highlights

FILCO® 661 FPG 005 is a bisphenolic unsaturated polyester resin in powder form:

  • Very high molecular weight
  • Very quickly soluble in styrene
  • Very high binding power for glass fibers in "hot melt" operating conditions
  • High degree of compatibility with unsaturated polyester matrices.

Applications & Uses

Compatible Polymers & Resins
Compatible Reinforcements

FILCO® 661 FPG 005 main application:

  • Styrene soluble binder for chopped strand mat and continous filament mat
  • Binder for preform.
Processing Information

2,5 - 5% of FILCO® 661 FPG 005 on the glass weigth is normally required according to the weight for square meter and stiffness wanted for glass mat. Water as fine mist is sprayed to help FILCO® 661 FPG 005 to stick to glass fibers. After application of FILCO® 661 FPG 005 the glass mat is stoved at 180 - 210 °C for 1 - 2 minutes. The operation lets water evaporate and melt FILCO® 661 FPG 005, which accumulates at the contact points of the glass strands, binding them.


Physical Form
Light yellow, free flowing powder, Light yellow, free flowing powder (at 50% styrene solution)
Typical Properties
ValueUnitsTest Method / Conditions
Zinc Stearate Content0.1 - 0.3%MA123LFE
Acid Number10 - 20mg KOH/gMA018LCP
Melt Index (at 125°C)10 - 25g/10 minutesMA109RPL
Viscosity (at 25°C, Spindle no.2, 10 rpm,at 50% styrene solution)2500 - 4000mPa.sMA143LFE
Particle Size Distribution
ValueUnitsTest Method / Conditions
Particle Size (On 500 μm)0%MA123LFE
Particle Size (On 425 μm)max. 5%MA123LFE
Particle Size (On 250 μm)2 - 12%MA123LFE
Particle Size (On 180 μm)30 - 42%MA123LFE
Particle Size (On 150 μm)9 - 31%MA123LFE
Particle Size (On 75 μm)17 - 29%MA123LFE
Particle Size (On 45 μm)6 - 12%MA123LFE
Particle Size (Passing Through)max. 8%MA123LFE

Packaging & Availability

Packaging Type
Regional Availability
  • Canada
  • Mexico
  • USA
Packaging Information

FILCO® 661 FPG 005 is supplied in 125 kg fiber drums with polyethylene bag

Storage & Handling

Storage Conditions

FILCO® 661 FPG 005 should be stored at temperatures below 30° C, away from direct sun rays and source of heat.