FILCO® 656 is a powdered unsaturated polyester resin with integrated catalyst and antiblocking agent, belonging to the Thermoset Polyester chemical family. Tailored for pultrusion and injection molding processes, this resin offers a convenient and efficient solution for manufacturing durable composite materials. With its unique formulation, FILCO 656 simplifies processing and enhances the versatility of applications in industries where thermoset polyester materials are utilized.

Polymer Name: Thermoset Polyester

Chemical Family: Polyesters

Processing Methods: Injection Molding, Pultrusion

Technical Data Sheet

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Identification & Functionality

Chemical Family
Composite Materials Functions

Applications & Uses

Composites Processing Methods
Processing Information
  • FILCO® 656 is recommended as unsoluble binder for the production of Continuous Filament Mat (CFM), for application in hot or cold press, vacuum and injection molding, pultrusion.
  • 4-10% on weight of the mat is normally used. The tensile strength of the mat obtained depends on the binder content and the curing rate of FILCO® 656.
  • Curing cycle depends on the oven conditions; the mat shall remain in a hot air circulating oven at 200-220°C for at least 90 seconds.


Physical Form
Off - white powder
Typical Properties
ValueUnitsTest Method / Conditions
Acid Number40mg KOH/gMA018LCP
Particle Size Distribution
ValueUnitsTest Method / Conditions
Particle Size (>500 μm)0%MA123LFE
Particle Size (>425 μm)2%MA123LFE
Particle Size (>250 μm)40%MA123LFE
Particle Size (>150 μm)32%MA123LFE
Particle Size (>75 μm)20%MA123LFE
Particle Size (>45 μm)4%MA123LFE
Particle Size (Passing Through)2%MA123LFE

Packaging & Availability

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

FILCO® 656 is supplied in 125 kg fiber drums.

Storage & Handling

Shelf Life
6 months
Storage and Shelf Life Conditions

FILCO® 656 should be stored in closed containers away from direct sun rays and source of heat, at temperature below 25°C. In these conditions, maximum suggested storage time is 6 months from production, in the original package. After that date the product must be rechecked.