FILCO® 354N represents an unsaturated polyester resin finely crafted within a non-ionic water dispersion, serving as a film former within glass fiber sizings. Its presentation showcases a milky liquid appearance. Key product characteristics encompass a non-ionic emulsifier inherent within the polymer, a narrow particle size distribution, a prolonged shelf life attributed to hydrolytic resistance and fine particle size, high mechanical shear stability even in diluted emulsions, and robust stability against hydrolysis and sedimentation across a wide pH range.

Functions: Film Former

Chemical Family: Bisphenols, Polyesters, Unsaturated Polyester (UPE)

Compatible Polymers & Resins: Unsaturated Polyester (UPE)

Processing Methods: Filament Winding, Pultrusion, Spray Lay-up

Technical Data Sheet

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Identification & Functionality

Composite Materials Functions

Features & Benefits

  • Non-ionic emulsifier built in the polymer
  • Narrow particle size distribution
  • High shelf life due to hydrolytic resistance and fine particle size
  • High mechanical shear stability of diluted emulsion
  • Hydrolysis and sedimentation stability in a wide pH range
Characteristics of Film
  • Clear
  • Not tacky
  • Glass transition temperature Tg=12°C
  • Very quickly soluble in styrene
  • Compatible with unsaturated polyesters and other thermosets

Applications & Uses

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

FILCO® 354N is suggested as film former for glass fiber sizes for:

  • Mat roving
  • Translucent sheet roving
  • Spray up roving
  • Filament winding roving – Weaving roving – Pultrusion roving


Physical Form
Milky liquid
Typical Properties
ValueUnitsTest Method / Conditions
Viscosity (at 25°C, #3, 20rpm)700 - 2000mPa.sMA143LFE
Solid Content45 - 49%MA145LFE
pH2.5 - 4-MA148LFE
Particle Size Distribution
ValueUnitsTest Method / Conditions
Average Particle Size300 - 600nmMA147LFE

Packaging & Availability

Regional Availability
  • Canada
  • Mexico
  • USA

Storage & Handling

Shelf Life
15 months
Storage and Shelf Life Conditions

FILCO® 354N 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 15 months from production, in the original package. After that date product must be rechecked.Prevent from freezing. Always observe suggested storage temperature range.Thoroughly mix before use. Depending on transport and/or storage conditions, formation of surface aggregates may sometimes be observed; this can easily be eliminated by stirring before use