FILCO® JS 126 serves as a saturated polyester resin incorporated within a non-ionic water emulsion, functioning as a plasticizer within glass fiber sizing applications. It embodies the characteristics of a saturated polyester with a medium to low molecular weight, forming a non-ionic emulsion with a narrow particle size distribution. This resin showcases excellent compatibility with both polyester and PVAc emulsions, enhancing its versatility in various applications.

Functions: Plasticizer, Resins, Binders & Matrix Materials

Chemical Family: Polyesters

Compatible Polymers & Resins: Polyesters, Polyvinyl Acetate (PVA)

Technical Data Sheet

Ask P.A.T. Products Questions

Leo Coyle avatarErik Espling avatarLogan York avatar
Message our experts with questions
Leo Coyle avatar

Leo Coyle

Skilled in food & beverage, paints & coatings, and other industries, I offer customer service and technical guidance to resolve complex queries.

Enhanced TDS

Identification & Functionality

Features & Benefits

Materials Features
  • Saturated polyester with medium-low molecular weight
  • Non ionic emulsion
  • Narrow particle size distribution
  • Excellent compatibility with both polyester and PVAc emulsions
Characteristics of Film

In addition to sizes based on polyester or on PVAc emulsions FILCO® JS 126 gives a dried film:

  • Softer
  • Very quickly soluble in styrene

Applications & Uses

Compatible Polymers & Resins
Compatible Reinforcements
Processing Information

FILCO JS 126 is suggested as plasticizer for:

  • Sizes based on Polyester and PVAc emulsions
  • PVAc emulsion binder for glass mat


Physical Form
Milky liquid
Typical Properties
ValueUnitsTest Method / Conditions
Solid Content58 - 62%MA145LFE
Viscosity1000 - 4000mPa.sMA143LFE
pH3.5 - 5.5-MA148LFE
Particle Size Distribution
ValueUnitsTest Method / Conditions
Average Particle Size300 - 600nmMA147LFE

Packaging & Availability

Regional Availability
  • Canada
  • Mexico
  • USA

Storage & Handling

Shelf Life
6 months
Storage and Shelf Life Conditions

FILCO® JS 126 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.