Description
Shin-Etsu CAT22251-35 is a 35 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 35 Shore A Mold Catalyst
Weigh SES22251 base and CAT22251-35 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. CAT22251-35 combines a stiffer 35 Shore A cure with the highest tear strength in the catalyst family, which is why shops often select it for molds with undercuts, where resistance to tearing during demold matters most.
35 Shore A Mold Catalyst Specifications
| Property | Detail |
|---|---|
| Catalyst | CAT22251-35 (for SES22251 base) |
| Cure type | Addition cure, two component |
| Mix ratio | 100:10 by weight (base:catalyst) |
| Shore A hardness | 35 |
| Working time | 90 minutes at 23C |
| Cure schedule | 24 hours at 23C |
| Tensile strength | 7.19 MPa |
| Tear strength | 24 kN/m |
| Elongation | 530% |
| 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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