FILCO® JS 888 serves as an unsaturated polyester-epoxy resin, available in non-ionic water dispersion, specifically designed for application as a film former in glass fiber sizings. Key characteristics of this product include a narrow distribution of particle sizes, ensuring uniformity and consistency in its application. Its resistance to hydrolysis, attributed to the fine particle size, contributes to its extended shelf life. Moreover, when diluted, it maintains high mechanical shear stability, ensuring its effectiveness in various operations within the glass fiber industry.

Functions: Film Former

Chemical Family: Epoxy-Polyester Hybrid

Compatible Polymers & Resins: Epoxies (EP), Unsaturated Polyester (UPE)

Technical Data Sheet

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Enhanced TDS

Identification & Functionality

Chemical Family
Composite Materials Functions
Product Families

Features & Benefits

Materials Features
  • Narrow particle size distribution
  • High shelf life due to hydrolytic resistance and fine particle size
  • High mechanical shear stability of diluted emulsion
Characteristics of Film
  • Clear
  • Not tacky
  • Very quickly soluble in styrene
  • Compatible with unsaturated polyester and epoxy resins

Applications & Uses

Compatible Polymers & Resins
Compatible Reinforcements
Composites End Use
Processing Information

FILCO® JS 888 is suggested as film former for glass fiber sizes for:

  • Roving for translucent sheet


Physical Form
Milky liquid
Typical Properties
ValueUnitsTest Method / Conditions
Solid Content39 - 42%MA145LFE
pH4.5 - 6.5-MA148LFE
Epoxy Equivalent Weight (on dry resin)550 - 650g/eqMA149LFE
Particle Size Distribution
ValueUnitsTest Method / Conditions
Average Particle Size200 - 600nmMA147LFE

Packaging & Availability

Regional Availability
  • Canada
  • Mexico
  • USA

Storage & Handling

Shelf Life
12 months
Storage and Shelf Life Conditions

FILCO® JS 888 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. During storage a slight settlement can take place, which can easily be eliminated by careful stirring. Prevent from freezing.