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Master Bond adhesives

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Reynolds Brush-On® 40 Brushable Polyurethane Rubber Compounds
Categories: Polymer; Thermoset; Polyurethane, TS; Thermoset Polyurethane, Elastomer, Unreinforced

Material Notes: Product Overview: Smooth-On’s Brush-On™ Series of mold rubbers are extremely versatile and are famous for their abrasion resistance and high tear strength. They have the convenience of a one-to-one mix ratio and are easy to mix and apply with a brush or spatula. Brush-On™ 35, 40, 50 & 60 paint onto vertical surfaces without sagging and will cure with negligible shrinkage to durable rubbers that perform and last in production. Each will capture exact detail from any original model. Brush-On™ 35 is the softest of the series and offers the most flexibility and is used for models with deep undercuts. Brush-On™ 35 & 40 can be inverted and used to make glove molds. Brush-On™ 50 and Brush-On™ 60 possess superior abrasion resistance and tear strength and are ideal for casting concrete and hard plasters in applications where less flexibility is required. These products are compatible. For example, you can apply two coats of Brush-On™ 40 and back it up with two coats of Brush-On™ 50 or 60. All three rubbers are suitable for reproducing sculpture, architectural restoration and production casting of concrete.

Information provided by Reynolds Advanced Materials

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Physical PropertiesOriginal ValueComments
Specific Gravity 1.17 g/ccASTM D-1475
Linear Mold Shrinkage <= 0.0010 in/in
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore A 40ASTM D-2240
Tensile Strength 300 psiASTM D-412
Elongation at Break 1000 %ASTM D-412
Tear Strength 60.0 pliDie C; ASTM D-624
 
Processing PropertiesOriginal ValueComments
Cure Time 16.0 hourOvernight
Pot Life 20.0 minASTM D-2471
 
Descriptive Properties
ColorOff-White
Mix Ratio100A:125Bby weight
 1A:1Bby volume
Mixed ViscosityBrushable
Specific Volume23.7[cu. in./lb.]

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