FILCO® 7703 is an unsaturated polyester resin provided in non-ionic water dispersion, serving as a film former in glass fiber sizings. It presents as a milky liquid. Notable characteristics of this product include an integrated non-ionic emulsifier within the polymer, high mechanical shear stability when the emulsion is diluted, and impressive hydrolysis and sedimentation stability across a broad pH range.

Functions: Film Former

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

Compatible Polymers & Resins: Unsaturated Polyester (UPE)

Processing Methods: Spray Lay-up

Technical Data Sheet

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Enhanced TDS

Identification & Functionality

Features & Benefits

Materials Features
Product Characteristics
  • Non-ionic emulsifier built in the polymer
  • 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=22°C
  • Quickly soluble in styrene
  • Compatible with unsaturated polyesters and other thermosets

Applications & Uses

Compatible Polymers & Resins
Compatible Reinforcements
Composites Processing Methods
Processing Information

FILCO® 7703 is suggested as film former for glass fiber sizes for:

  • Mat roving
  • Spray up roving


Physical Form
Milky liquid
Typical Properties
ValueUnitsTest Method / Conditions
Viscosity (at 25°C, #3, 20 rpm)max. 5000mPa.sMA143LFE
Solid Content45 - 49%MA145LFE
pH2 - 4-MA148LFE
Glass Transition Temperature (Tg)22°C-
Particle Size Distribution
ValueUnitsTest Method / Conditions
Average Particle Size200 - 700nmMA147LFE

Packaging & Availability

Regional Availability
  • Canada
  • Mexico
  • USA

Storage & Handling

Shelf Life
6 months
Storage and Stability

FILCO® 7703 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