Castaldo Quick-Sil Firm & Flexible is a two-part room temperature vulcanizing (RTV) silicone putty that produces tough, strong, long-lasting production jewelry molds for lost wax casting with 0% shrinkage. Safe, non-hazardous, and non-toxic, it produces no unpleasant fumes or odors — making it a reliable choice for professional studio environments.
Mixing is straightforward: combine equal parts of Part A and Part B by hand. No precise measurement or vacuum equipment is required to achieve optimum results. While no vulcanizing is needed, best results are achieved when the mixed putty is clamped under pressure — such as in a vise or an unheated mold press. Detailed instructions are included with every kit.
Beyond lost wax casting molds, Castaldo Quick-Sil Firm & Flexible is also suited for direct casting of low-temperature metals such as lead, tin, and pewter.
Firm & Flexible is the original Quick-Sil formula. A Soft & Flexible version is also available — see part number 122.6135SOFT.
Intended for professional use only by persons familiar with jewelry casting techniques.
| Formula | Two-part RTV silicone putty |
|---|---|
| Shrinkage | 0% |
| Work Time | 1–2 minutes |
| Cure Time | Approximately 15 minutes |
| Kit Size | 2.2 lbs. (1 kg) |
| Hazard Rating | Non-hazardous, non-toxic |
| Intended Use | Professional use only |
Work time is 1–2 minutes. Plan your workflow accordingly before mixing. This product is intended for professional use only and should be used exclusively by persons familiar with jewelry casting techniques. For a softer durometer option, see the Soft & Flexible version, part number 122.6135SOFT.
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