FILCO® 657/01 is a powdered unsaturated polyester resin with integrated catalyst and antiblocking agent, belonging to the Thermoset Polyester chemical family. Functioning as a binder, this resin undergoes crosslinking just above its melting temperature. Upon curing, it achieves nearly complete insolubility in styrene. Tailored for pultrusion and Resin Transfer Molding (RTM), FILCO® 657/01 stands as a versatile solution, offering efficient processing methods for the creation of durable and thermoset polyester-based products.

Polymer Name: Thermoset Polyester

Chemical Family: Polyesters

Functions: Resins, Binders & Matrix Materials

Processing Methods: Pultrusion, Resin Transfer Molding (RTM)

Technical Data Sheet

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Identification & Functionality

Chemical Family
Composite Materials Functions

Features & Benefits

Product Highlights
  • FILCO® 657/01 is an unsaturated polyester resin in powder form containing catalyst and antiblocking agent.
  • FILCO® 657/01 crosslinks just above melting temperature. After curing, it becomes almost completely insoluble in styrene.

Applications & Uses

Compatible Reinforcements
Composites Processing Methods

FILCO® 657/01 is recommended as a binder for the production of insoluble glass mats. These mats, obtained with chopped strand or continuous filaments, are used for example in hot or cold press, pultrusion, vacuum and injection (RTM) moldings.

Processing Information

4 - 10% on the weight of the mat is normally used. The tensile strength of the mats obtained, either dry or after immersion in styrene, depends on the binder content and the curing rate of FILCO® 657/01. The curing cicle of FILCO® 657/01 depends on the oven conditions. The mat must stay in a hot air circulating oven at 200° - 220° C for at least 90 seconds. Temperature below 200° C or above 240° C are not advised. Below 200 °C there is a risk of insufficient curing, while above 240°C yellowing may occur.


Physical Form
Off white free flowing powder
Typical Properties
ValueUnitsTest Method / Conditions
Acid Number35 - 45mg KOH/gMA018LCP
Particle Size Distribution
ValueUnitsTest Method / Conditions
Particle Size (On 500 μm)0%MA123LFE
Particle Size (On 425 μm)max. 4%MA123LFE
Particle Size (On 250 μm)36 - 46%MA123LFE
Particle Size (On 150 μm)26 - 38%MA123LFE
Particle Size (On 75 μm)15 - 25%MA123LFE
Particle Size (On 45 μm)max. 6%MA123LFE
Particle Size (Passing Through)max. 3%MA123LFE

Packaging & Availability

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

FILCO® 657/01 is supplied in 125 kg fiber drums

Storage & Handling

Shelf Life
6 months
Storage and Shelf Life Conditions

FILCO® 657/01 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.