Shin-Etsu SES22251-30 Mold Making Silicone, 30 Shore A

Description

SES22251 silicone is Shin-Etsu’s addition-cure mold making system supplied with CAT22251-30 catalyst for a 30 Shore A cured rubber. Shin-Etsu lists the system for high tensile strength, tear resistance, low shrinkage, easy release, and a 100:10 mix ratio by weight.

SES22251 silicone Benefits

• 30 Shore A hardness gives mold makers a balanced rubber for shape retention and release.
• 90 minute working time supports careful mixing, vacuum degassing, and controlled pours.
• Low shrinkage helps preserve model detail from master pattern to finished mold.
• High tear data supports repeated demolding around reasonable undercuts.
• Common base system lets shops choose other catalyst grades when a different hardness is needed.

This grade fits mold rooms that need a stronger addition-cure silicone for prototypes, casting tools, and repeatable detail reproduction. Keep catalyst grade, lot number, and mix ratio visible at the bench.

SES22251 silicone Applications

• Prototype molds for urethane, epoxy, wax, and gypsum casting after testing.
• Detailed mold work where low shrinkage and release matter.
• Short-run production molds for industrial parts and model-shop work.
• Master pattern replication with translucent two-part silicone.
• Tooling programs that qualify a 30 Shore A mold rubber.

Surface Preparation and Use

Make sure the master pattern is clean, dry, sealed if porous, and compatible with addition-cure silicone. Some materials can inhibit cure, so test the actual pattern, sealers, paints, and release agents before pouring a full mold.

Weigh base and catalyst accurately, mix until uniform, and scrape the container during mixing. Degas when required by the part geometry, then pour slowly into the lowest point of the mold box.

Technical Details and Documentation

Shin-Etsu data lists 50 Pa.s base viscosity, 24 hour cure at 23 C, 7.90 MPa tensile strength, 21 kN/m tear strength, 660 percent elongation, and -40 C to +175 C usable temperature range. Review current product information from Shin-Etsu Silicone before production use.

Ordering Help

For related mold rubber and casting materials, browse Chemical Concepts molding materials. For help selecting hardness, catalyst grade, or packaging, call (800) 220-1966 or email [email protected].