Smooth-On Rebound 40 Silicone Mold Rubber Kit

$41.99 / EA

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Smooth-On Rebound 40 Silicone Mold Rubber Kit

Rebound 40 is an easy-to-use platinum-cure silicone rubber which self-thickens for making brush-on molds of almost any model. Mixed 1A:1B by volume (no scale necessary), Rebound rubber can be applied with a brush or spatula to vertical surfaces without sagging and will cure with negligible shrinkage to a flexible rubber.

Rebound 40 is hard and not very flexible. It is compatible with Rebound 25. For example, you can apply two coats of Rebound 25 and back it up with two coats of Rebound 40.

Advantages Over Urethane Brush-On Rubber: Rebound will not stick to most surfaces, so surface preparation is minimal. Two liquids that mix easily together. Stands up better to production casting of resins and low temperature melt metal alloys has a long library life. 4 thin layers are all that is necessary to make a flexible, strong and durable production mold for casting wax, gypsum, concrete or resins (urethane, polyester, etc.). And because Rebound is a platinum silicone, it will last for many years in your mold library. Applications include reproducing sculpture, architectural restoration, making candle molds, casting pewter, etc.

Mold Performance & Storage - The physical life of the mold depends on how you use it (materials cast, frequency, etc.). Casting abrasive materials such as concrete can quickly erode mold detail, while casting non-abrasive materials (wax) will not affect mold detail. Before storing, the mold should be cleaned with a soap solution and wiped fully dry. Two part (or more) molds should be assembled. Molds should be stored on a level surface in a cool, dry environment.

Mix Ratio By Volume: 1A:1B

Mix Ratio By Weight: 1A:1B

Pot Life: 20 Minutes

Cure Time: 6 Hours

Shore Hardness: 40 A

Specific Gravity: 1.14 g/cc

Specific Volume: 23.5 cu. in./lb

Tensile Strength: 486psi

Elongation @ Break: 324%

Die B Tear Strength: 106pli

Color: Green

Shrinkage: <.001in. / in.