Large Mirror-polished Square Compression Mold

Large mirror-polished square compression mold is a high-gloss FRP molding tool designed for producing smooth, reflective surface parts such as wash basins, shower trays, equipment covers, and decorative panels. The die face is polished to a mirror finish to produce parts that require no additional painting or gel coat.

Surface Finish

The cavity surface is ground and polished through a series of grit steps up to mirror finish (Ra < 0.1 µm). This produces parts with a smooth, glossy surface that replicates the mold face exactly. No pinholes, flow lines, or weld marks are visible on the finished part.

Construction

• Heavy steel die plate for rigidity under high press pressure.

• Heating cartridges for uniform cure temperature.

• Guide pillars and bushings for precise alignment.

• Ejector pin layout for distortion-free part removal.

• Lifting eyes for safe handling on the press.

Applications

Mirror-polished compression molds produce sanitary ware (basins, shower trays), kitchen sinks, decorative FRP panels, electrical enclosure covers with high surface finish, and automotive interior components. The smooth surface also makes cleaning easier and improves chemical resistance.

Material Considerations

For mirror-finish parts, gel coat is often sprayed into the cavity before the SMC charge is loaded. The gel coat provides the decorative and corrosion-resistant surface, while the glass-reinforced backing provides structural strength.

Conclusion

The large mirror-polished square compression mold is a precision tool for high-surface-finish FRP parts. The polishing process is labor-intensive but essential for parts that must match the quality of sanitary ware or decorative panels.