FILCO® 352 is an unsaturated polyester resin formulated within a non-ionic or anionic water emulsion, dedicated to serving as a film-former within glass fiber sizings. Its appearance is that of a milky liquid. Noteworthy product characteristics include a narrow particle size distribution, a commendable shelf life attributed to hydrolytic resistance and fine particle size, high mechanical shear stability even in diluted emulsions, as well as stability against hydrolysis and sedimentation across a wide pH range.

Functions: Film Former

Chemical Family: Polyesters, Unsaturated Polyester (UPE)

Compatible Polymers & Resins: Unsaturated Polyester (UPE)

Processing Methods: Filament Winding

Technical Data Sheet

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Identification & Functionality

Composite Materials Functions

Features & Benefits

  • Narrow particle size distribution
  • Good shelf life owing to hydrolytic resistance and fine particle size
  • High mechanical shear stability of the diluted emulsion
  • Hydrolysis and sedimentation stability in a wide pH range
Characteristics of Film
  • Clear, not tacky
  • Glass transition temperature Tg=9°C
  • Compatible with unsaturated polyesters or other thermosets
  • Very quickly soluble in styrene

Applications & Uses

Compatible Polymers & Resins
Compatible Reinforcements
Composites End Use
Composites Processing Methods
Processing Information

FILCO® 352 is suggested as film former for glass fiber sizes for:

  • Filament winding roving
  • Pultrusion roving
  • Weaving roving


Physical Form
Milky liquid
Typical Properties
ValueUnitsTest Method / Conditions
Solid Content38 - 42%MA145LFE
Viscositymax. 800-MA143LFE
pH3.5 - 5.5-MA148LFE
Particle Size Distribution
ValueUnitsTest Method / Conditions
Average Particle Size100 - 600nmMA147LFE

Packaging & Availability

Regional Availability
  • Canada
  • Mexico
  • USA

Storage & Handling

Shelf Life
6 months
Storage and Shelf Life Conditions

FILCO® 352 should be stored in closed containers away from direct sun rays, at temperature between +5 and +30°C. In these conditions maximum suggested storage time is 6 months from production, in the original package. After that date product must be rechecked. Prevent from freezing