Ransom & Randolph SC20 Investment Powder

The Global Benchmark for High-Quality Gold and Silver Casting

Ransom & Randolph SC20 investment is widely recognized across the international jewelry industry as the gold standard for creating lost-wax molds. Engineered specifically for the production of high-quality gold and silver pieces, this professional-grade formula is trusted by master casters and fine art studios worldwide. Whether you are producing intricate jewelry or detailed art pieces, SC20 provides the consistency and reliability required for flawless metal reproduction.

Advanced Formula and Innovation SC20 is a premium blend of powdered silica (quartz), cristobalite, and a high-strength gypsum binder. This unique composition provides ideal thermal expansion, which is critical for maintaining the integrity of the mold during the wax setting and burnout phases. The formula is remarkably flexible, making it compatible with a diverse range of metal alloys and complex design geometries. For those casting larger items, such as figurines, the SV20 variant offers a thick-slurry version of this trusted technology to accommodate greater volume.

Safety and Precision with BANDUST Technology Health and safety are paramount in the casting environment. This investment is available with BANDUST technology, a significant innovation designed to reduce respirable dust during the investing process. This feature ensures a cleaner workspace without compromising the material properties that have made SC20 the world’s most trusted name in jewelry investment.

Technical Properties and Mixing Guidelines To achieve the best results, precision during the mixing phase is essential. SC20 is designed to be mixed on-site with water to form a smooth, workable mold.

• Recommended Mixing Ratio: 38 to 40 mL of water per 100g of powder.

• Material Composition: Powdered silica, cristobalite, and calcium sulfate (gypsum) binder.

• Origin: Proudly made in the USA.

Professional Mixing Instructions For optimal mold strength and surface finish, please follow these standardized steps:

1. Preparation: Weigh the investment powder and measure the water accurately.

2. Combination: Always add the investment powder to the water (not vice versa).

3. Mixing: Mix thoroughly for 3 to 3.5 minutes.

4. Vacuum Phase: Vacuum the mixture for 20 seconds after it reaches a boil.

5. Pouring: Carefully pour the investment into the flask.

6. Final Vacuum: Vacuum the flask for up to 90 seconds to remove any remaining air bubbles.

7. Setting: Allow the flask to sit undisturbed for a minimum of 2 hours.

8. Burnout Preparation: Preheat the furnace to 300°F (149°C). Note: Do not preheat if you are loading multiple flasks at once.

9. Loading: Remove the sprue base, load into the furnace, and follow your designated burnout cycle.