FILCO® 661MF008 stands as a bisphenolic, unsaturated polyester resin in a convenient powder form, characterized by its very high molecular weight, rapid solubility in styrene, and remarkably high binding power for glass fibers, particularly in "hot melt" operating conditions. This resin exhibits a notable compatibility with unsaturated polyester matrices, ensuring seamless integration into composite systems. With the ability to produce a specific type of mat, FILCO 661 MF008 is a versatile and efficient material for manufacturing composite products, offering a comprehensive solution for a range of applications.

Functions: Resins, Binders & Matrix Materials

Chemical Family: Bisphenols, Polyesters, Unsaturated Polyester (UPE)

Compatible Polymers & Resins: Unsaturated Polyester (UPE)

Technical Data Sheet

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Identification & Functionality

Composite Materials Functions

Features & Benefits

Product Highlights

FILCO® 661MF008 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 the type of mat produced

Applications & Uses

Compatible Polymers & Resins
Compatible Reinforcements

FILCO® 661MF008 main application

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

2.5 - 5% of FILCO® 661MF008 on the glass weight 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® 661MF008 to stick to glass fibers. After application of FILCO® 661MF008 the glass mat is stoved at 180 - 210 °C for 1 - 2 minutes. The operation lets water evaporate and melt FILCO® 661MF008, which accumulates at the contact points of the glass strands, binding


Physical Form
Light yellow, free flowing powder
Typical Properties
ValueUnitsTest Method / Conditions
Zinc Stearate Content0.08%MA123LFE
Acid Number12 - 18mg KOH/gMA018LCP
Melt Index (at 125°C)15 - 25g/10 minutesMA109RPL
Particle Size Distribution
ValueUnitsTest Method / Conditions
Particle Size (On 500 μm)%MA123LFE
Particle Size (On 425 μm)max. 0.5%MA123LFE
Particle Size (On 250 μm)3 - 9%MA123LFE
Particle Size (On 180 μm)26 - 40%MA123LFE
Particle Size (On 150 μm)23 - 35%MA123LFE
Particle Size (On 75 μm)14 - 24%MA123LFE
Particle Size (On 45 μm)6 - 12%MA123LFE
Particle Size (Passing Through)max. 6%MA123LFE

Packaging & Availability

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

FILCO® 661MF008 is supplied in 125 kg fiber drums with polyethylene bag

Storage & Handling

Storage Conditions

FILCO® 661MF008 should be stored in the original package, at temperatures below 30° C, away from direct sun rays and source of heat.