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Reynolds Rebound® 40 Brushable Platinum Silicone Rubbers
Categories: Polymer; Thermoset; Silicone; Silicone Rubber

Material Notes: Product Overview: Rebound™ 25 and Rebound™ 40 are easy-to-use platinum-cure silicone rubbers which self-thicken 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™ 25 is soft, flexible and is good for making molds of models with deep undercuts. Depending on model configuration, Rebound™ 25 can be inverted as a glove molds. Rebound™ 40 is harder and less flexible. These products are compatible. 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: (a) Rebound™ will not stick to most surfaces, so surface preparation is minimal, (b) Two liquids that mix easily together, (c) stands up better to production casting of resins and low temperature melt metal alloys and (d) 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.

Information provided by Reynolds Advanced Materials

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Physical PropertiesOriginal ValueComments
Specific Gravity 1.14 g/ccASTM D-1475
Linear Mold Shrinkage <= 0.0010 in/inASTM D-2566
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore A 40ASTM D-2240
Tensile Strength 486 psiASTM D-412
Elongation at Break 324 %ASTM D-412
Tear Strength 106 pliDie B; ASTM D-624
 
Thermal PropertiesOriginal ValueComments
Maximum Service Temperature, Air 232 °C
Minimum Service Temperature, Air -53.0 °C
 
Processing PropertiesOriginal ValueComments
Cure Time 6.00 hour
Pot Life 20.0 minASTM D-2471
 
Descriptive Properties
ColorGreen
Mix Ratio1A:1Bby volume
 1A:1Bby weight
Specific Volume23.5[cu. in./lb.]

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PREYN137 / 296838

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