Sizing chemistry defines strand handling in production and mechanical performance in the finished composite — our YT-FB grades stabilize the bath and strengthen the fiber-resin interface.
YT-FB waterborne polyurethane dispersions act as film-forming binders in glass fiber sizing. They maintain strand integrity during winding and chopping, compatibly with silane coupling agents, and improve tensile and impact properties in downstream composite parts.
Stable sizing bath performance
Compatible with silane coupling agents
Strong fiber bundling and processability
Improved composite tensile & impact strength
Film-formers that keep bundles intact through winding, chopping and packaging.
Stronger fiber-matrix adhesion in SMC, BMC and hand lay-up systems.
Short-fiber reinforcement in PA, PP and PBT with improved impact properties.
From fiber exit to sized strand — binder chemistry controls bundling and interface strength.
PUD, silane, lubricants and water mixed to target solids and pH.
Fresh fibers pass through the sizing applicator at line speed.
Moisture removed; PUD film binds filaments into a coherent strand.
Sized fiber enters composite processing with a stronger interface.
Fiber diameter, silane chemistry and composite resin define the right YT-FB grade.
| Parameter | What to specify |
|---|---|
| Fiber type | E-glass, C-glass, specialty fibers |
| Silane system | Epoxy, amino, vinyl compatible grades |
| Process | Direct roving, chopped strand, mat |
| Composite resin | UP, VE, epoxy, thermoplastic |
| Target property | Tensile, impact, interface adhesion |
Representative YotoChem grades for this application — full TDS available on request.
Nonionic aliphatic waterborne polyurethane dispersion with soft, elastic films and excellent adhesion to TPU substrates — for textile treatment, fiberglass sizing and fabric finishing.
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Nonionic aliphatic waterborne polyurethane dispersion — stable in acid/alkaline systems, with excellent water and solvent resistance, strong adhesion and initial tack. For textile treatment, fiberglass sizing and fabric finishing.
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One-component anionic aliphatic waterborne polyurethane adhesive with excellent heat resistance, fast drying, strong initial tack, high bond strength, water resistance and good spray atomization — for textile, fabric and fiberglass treatment.
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Anionic aliphatic PUD for heat-activated bonding at 50–55 °C — excellent brushability, fast activation and crystallization, strong bond strength and heat resistance; for textile/fabric treatment, fiberglass sizing, footwear, furniture and automotive interior assembly.
View grade →Our grades are formulated for compatibility with common epoxy and amino silanes — share your silane supplier and pH window for confirmation.
Many lines have switched to YT-FB waterborne film-formers with equal or better strand integrity and cleaner operation.
Bath solids depend on fiber speed and pick-up target — we recommend starting points based on your applicator and drying capacity.
We assist with sized fiber trials and composite panel testing against your current sizing reference.
Share your fiber type, silane system and composite target — we'll recommend a YT-FB grade or custom adjustment.
