FILCO® 361 is an epoxy-ester resin meticulously crafted within a non-ionic water emulsion, designated as a film-former within glass fiber sizings. It manifests as a milky liquid. Key product characteristics include its high molecular weight epoxy-ester composition, 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, and robust stability against hydrolysis and sedimentation across a wide pH range.

Functions: Film Former

Chemical Family: Epoxy Ester

Compatible Polymers & Resins: Unsaturated Polyester (UPE)

Processing Methods: Spray Lay-up

Technical Data Sheet

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Identification & Functionality

Chemical Family
Composite Materials Functions

Features & Benefits

  • High molecular weight epoxy-ester
  • 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
  • Hard, clear
  • Glass transition temperature Tg=15°C
  • Compatible with unsaturated polyesters
  • Medium-low solubility in styrene

Applications & Uses

Compatible Polymers & Resins
Compatible Reinforcements
Composites Processing Methods
Processing Information

FILCO® 361 is suggested, alone or in combination with other components, as film-former for glass fibers for:

  • Mat roving
  • Spray-up roving
  • Roving for SMC and BMC


Physical Form
Milky liquid
Typical Properties
ValueUnitsTest Method / Conditions
Solid Content29 - 31%MA145LFE
Viscositymax. 300mPa.sMA143LFE
pH4.5 - 6.5-MA148LFE
Epoxy Equivalent Weight (on dry resin)3500 - 6000g/eqMA149LFE
Particle Size Distribution
ValueUnitsTest Method / Conditions
Average Particle Size200 - 500nmMA147LFE

Packaging & Availability

Regional Availability
  • Canada
  • Mexico
  • USA

Storage & Handling

Shelf Life
12 months
Storage and Shelf Life Conditions

FILCO® 361 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 12 months from production, in the original package. After that date product must be rechecked.Prevent from freezing.