What is the recommended mixing ratio for Polyform casting resin?

Correct Mixing Ratio for Polyform Resin

For optimal performance and curing, Polyform casting resin requires precise measurement. Mix Part A and Part B at a 90:100 ratio by weight. This means for every 100g of Part B, you should add 90g of Part A. Thorough, accurate weighing is key—use a digital scale rather than estimating by volume to avoid under- or over-curing.

Mixing and Application Best Practices

Carefully measure each component and combine them in a clean container. Stir gently but thoroughly, scraping the sides and bottom to ensure a fully homogenous mixture. Acting promptly is important, as Polyform starts to set in about 5 minutes and can be demoulded after roughly 30 minutes. Clean, silicone-based moulds are ideal for detailed model casting.

• Always mix at room temperature (above 8–10°C) to avoid curing issues.
• Do not attempt to colour Polyform, as it is not compatible with dyes.
• Any unused mixture should be disposed of safely before hardening.

When Resin Ratios Matter Most

Accurate mixing is especially vital when producing models that require strong, detailed castings or where fast curing is necessary for small batch production. Inconsistent ratios may result in incomplete curing or brittle casts, which can undermine the quality of your prototype or miniature.