FILCO® 658 is an unsaturated polyester resin presented in powder form, enriched with a catalyst and an antiblocking agent. Available in diverse variants like FILCO® 658 (around 1% catalyst) and FILCO® 658 (approximately 2% catalyst), it is recommended as an insoluble binder specifically designed for producing Continuous Filament Mat (CFM). Primarily utilized in pultrusion processes, this product appears as an off-white powder.

Polymer Name: Thermoset Polyester

Chemical Family: Polyesters

Processing Methods: Pultrusion

Technical Data Sheet

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Identification & Functionality

Chemical Family
Composite Materials Functions

Applications & Uses

Composites Processing Methods
Processing Information

FILCO® 658 is recommended as unsoluble binder for the production of Continuous Filament Mat (CFM), for application mainly in 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® 658. 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. Temperatures below 200 or above 240°C are not advised: below 200°C because of risk of lack of curing, above 240°C as yellowing might occur.


Physical Form
Off - white powder
Typical Properties
ValueUnitsTest Method / Conditions
Glass Transition Temperature (Tg)104°F-
Catalyst Content0.5 - 2%-
Acid Number40mg KOH/gMA018LCP
Particle Size Distribution
ValueUnitsTest Method / Conditions
Particle Size (On 425 μm)max. 4%MA123LFE
Particle Size (On 250 μm)5%MA123LFE
Particle Size (On 150 μm)40%MA123LFE
Particle Size (On 75 μm)30%MA123LFE
Particle Size (On 45 μm)10%MA123LFE
Particle Size (Passing Through)10%MA123LFE

Packaging & Availability

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

FILCO® 658 is supplied in 125 kg fiber drums.

Storage & Handling

Shelf Life
6 months
Storage and Shelf Life Conditions

FILCO® 658 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.