Polyester Putties
Mineral Fillers for Polyester & Epoxy Putties
Overview
Polyester and epoxy putties are used extensively in automotive body repair, marine vessel maintenance, and construction applications. Raviraj Minerals supplies ultra-fine calcium carbonate and talc that serve as the primary mineral fillers in these formulations, contributing to critical application properties such as sag resistance, sandability, and surface finish.
Calcium Carbonate
Calcium carbonate is the highest-volume filler in polyester putty formulations. At high loading levels (typically 40–60%), it provides the body and build required for effective gap filling while maintaining a workable paste consistency. Raviraj Minerals supplies fine-ground, dry calcite with controlled oil absorption for consistent putty rheology.
- Primary filler providing body, build, and gap-filling capability
- Controlled oil absorption ensures consistent paste consistency
- Improves sandability and feathering edge of cured putty
- High whiteness provides a clean base for primer and topcoat application
- Dry and low-moisture content — ensures uniform cure without blistering
Talc Powder
Talc is added to polyester putties as a thixotropic agent and reinforcing filler. Its plate-like morphology builds thixotropy in the uncured paste, preventing sag on vertical surfaces. After curing, talc-reinforced putty delivers improved flexural strength and crack resistance compared to CaCO₃-only formulations.
- Builds thixotropy — prevents sag on vertical and overhead surfaces
- Improves flexural strength and impact resistance of cured putty
- Reduces shrinkage during cure for improved dimensional accuracy
- Enhances surface smoothness for easier sanding and priming
- Used in automotive, marine, and construction putty formulations
Need a custom mineral solution?
Our technical team can help you identify the right mineral grades for your Polyester Putties application.
Get in Touch
