Transparent Casting UPR
Key Features
- High optical clarity — water-white color and >85% transmittance
- Low yellowing with NPG/isophthalic formulation base
- Low volumetric shrinkage for dimensional accuracy
- Accepts transparent dyes and opaque pigment pastes
- Good surface finish — self-polishing with fine abrasive
Transparent Casting UPR is a high-clarity, low-yellowing unsaturated polyester resin specifically developed for decorative casting, encapsulation, and novelty object production where optical clarity and aesthetic appearance are paramount. The resin is formulated with neopentyl glycol and isophthalic acid components to provide excellent UV stability and color retention in finished castings.
The resin exhibits water-white to very slight yellow color (Gardner ≤1) in liquid state and maintains optical transparency after cure, with light transmittance >85% at 3 mm thickness. Viscosity at 25°C is 300-500 mPa·s, low enough for bubble-free pouring. The low shrinkage (2-3% volumetric) ensures dimensional accuracy and surface flatness in cast objects. Barcol hardness of fully cured castings is 35-45.
This resin is ideal for embedding objects, decorative panels, artificial stone, and counter-tops. It accepts standard peroxide cure systems (MEKP or BPO) and can be tinted with compatible transparent dyes or opaque pigment pastes. Pre-accelerated versions are available for workshop convenience. Post-curing at 60°C improves UV resistance and final hardness.
Specifications
| Parameter | Value |
|---|---|
| Appearance | Water-white to very slight yellow |
| Color (Gardner) | ≤1 |
| Viscosity (25°C) | 300-500 mPa·s |
| Volumetric Shrinkage | 2-3% |
| Gel Time (25°C, 1.5% MEKP) | 20-35 min |
| Barcol Hardness (fully cured) | 35-45 |
| Light Transmittance (3mm, cured) | >85% |
Applications
FAQ
Degas the mixed resin under vacuum (50-100 mbar) for 5-10 minutes before pouring. Pour slowly and avoid agitation. For castings >20 mm thick, use a slower catalyst level (0.5-1.0% MEKP) to extend pot life and allow bubbles to rise. A pressure pot at 2-4 bar during gelation compresses residual micro-bubbles to below visible size. Pre-warm the mold to 25°C to reduce surface tension at the mold interface.
Direct Contact
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