UR Series Economical Unsaturated Resin Color Pastes for artificial stone, FRP and pultrusion applications
UR Series

Economical Unsaturated Resin Color Pastes

Cost-EffectivePlasticizer-Free35 Colors + 150 Stock

UR series is a cost-effective unsaturated resin colorant line designed for artificial stone, industrial-grade FRP, hand lay-up molding, BMC/DMC compounds, pultruded profiles and gel coat applications. The base resin contains zero plasticizers, ensuring excellent compatibility with unsaturated polyester systems with no risk of migration, exudation or surface bloom. With high pigment concentration, the recommended let-down ratio is only 1-2%, reducing usage cost while maintaining stable color. We offer 35 standard colors plus 150 stock base colors covering Pantone C/TPX and RAL color cards. UR series delivers reliable, consistent coloring performance at an economical price point for high-volume industrial applications.

Cost-Effective

Economical pricing for high-volume industrial FRP and artificial stone production

Plasticizer-Free

Base resin contains no plasticizers, eliminating migration and exudation risks

Excellent UP Compatibility

Perfect compatibility with unsaturated polyester resins, no curing interference

High Concentration

1-2% let-down ratio, low dosage cost, 35 standard colors + 150 stock colors

35 Standard Colors

Plasticizer-free base resin, 1-2% let-down ratio, excellent UP compatibility. Also available in 150 stock base colors matching Pantone C/TPX and RAL.

Frequently Asked Questions

What is the difference between UR series and UP series?

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UR series is our economical line designed for high-volume applications like artificial stone, industrial FRP, hand lay-up and BMC/DMC, offering reliable performance at a competitive price. UP series is our premium line using high-performance imported pigments (BASF, Clariant, etc.) for high-end gel coats, architectural profiles and composites requiring superior weather resistance.

Why is plasticizer-free important?

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Plasticizers in color pastes can migrate to the surface over time, causing bloom, stickiness, reduced gloss, and interference with curing and bonding. Our UR series uses a plasticizer-free base resin that is fully compatible with unsaturated polyester, ensuring no migration, no exudation, and stable surface quality throughout the product lifecycle.

What is the recommended dosage?

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The standard let-down ratio is 1-2% by weight. UR series has high pigment concentration, so a small amount delivers consistent, uniform color. Adjust within 1-3% based on desired depth and opacity.

How many colors are available?

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We offer 35 standard colors in this catalog, plus 150 stock base colors covering Pantone C/TPX and RAL color cards. Custom color matching is also available for volume orders.

What applications and processes are suitable?

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UR series is designed for artificial quartz stone, industrial-grade FRP (fiberglass reinforced plastic), hand lay-up molding, BMC/DMC compounds, pultruded profiles and tubes, gel coat, and organic sheet/cast applications.

Does UR series affect curing of unsaturated polyester?

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No, the plasticizer-free base resin is fully compatible with unsaturated polyester systems and does not interfere with curing efficiency or mechanical properties. The colorant disperses evenly and maintains stability during processing.

Need a Quote for UR Series?

UR series offers reliable coloring at an economical price. Contact us for volume pricing and custom color matching. All inquiries will be replied within 24 hours.