Description
Shin-Etsu CAT22251-30 is a 30 Shore A mold catalyst that pairs with the SES22251 base resin to form a two-part, addition-cure moldmaking silicone. It is sold separately from the base so a shop can stock one SES22251 drum and blend it against any of four catalyst grades (20, 30, 35, or 40 Shore A) depending on the durometer a given mold requires.
Using the Shin-Etsu 30 Shore A Mold Catalyst
Weigh SES22251 base and CAT22251-30 catalyst separately, then combine at a 100:10 ratio by weight and mix until the color is uniform throughout. The mixed system carries a 90 minute working time at 23 degrees C, enough time to pour a detailed pattern or brush a mold coat before the silicone begins to set. Full cure is reached in 24 hours at 23 degrees C. As the softest catalyst in the CAT22251 family, CAT22251-30 is a common pick for molds that need to release cleanly from parts with fine detail, moderate undercuts, or delicate surface texture. This makes it a practical choice for rapid prototyping, architectural reproduction, and short-run production molds where mold life and clean release matter as much as detail reproduction.
30 Shore A Mold Catalyst Specifications
| Property | Detail |
|---|---|
| Catalyst | CAT22251-30 (for SES22251 base) |
| Cure type | Addition cure, two component |
| Mix ratio | 100:10 by weight (base:catalyst) |
| Shore A hardness | 30 |
| Working time | 90 minutes at 23C |
| Cure schedule | 24 hours at 23C |
| Tensile strength | 7.90 MPa |
| Tear strength | 21 kN/m |
| Elongation | 660% |
| Usable temperature range | -40C to 175C |
Browse related mold making and molding materials for SES22251 base resin, thickeners, and release agents. For manufacturer literature on the CAT22251 catalyst family, visit Shin-Etsu Silicones.
Need Help?
Need help choosing the right CAT22251 durometer for your mold? Call (800) 220-1966 or email [email protected].
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