FILCO® 9661 is an unsaturated polyester resin available in powdered form. It manifests as a light yellow, free-flowing powder and is characterized by a very high molecular weight. Notably, it demonstrates rapid solubility in styrene and exhibits substantial binding strength for glass fibers, particularly in 'hot melt' conditions.

Polymer Name: Thermoset Polyester

Chemical Family: Bisphenols, Polyesters

Technical Data Sheet

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Enhanced TDS

Identification & Functionality

Chemical Family
Composite Materials Functions

Features & Benefits

  • Very high molecular weight
  • Very quickly soluble in stirene
  • High binding power for glass fibers in "hot melt" operating conditions
  • Softening point aroung 105°C

Applications & Uses

Compatible Reinforcements


Physical Form
Off - white powder
Typical Properties
ValueUnitsTest Method / Conditions
Acid Number40mg KOH/gMA018LCP
Melt Index (at 125°C)15 - 25g/10 minutesMA109RPL

Packaging & Availability

Regional Availability
  • Canada
  • Mexico
  • USA

Storage & Handling

Shelf Life
24 months
Storage and Shelf Life Conditions

FILCO® 9661 should be stored in closed containers away from direct sun rays, at temperature below +30°C. In these conditions maximum suggested storage time is 24 months from production, in the original package. After that date product must be rechecked.