observations of the structure of the macro image, the larger the particle size of montmorillonite is getting stronger maintaining physical shape which is in mesh 20 and 40. This is because that the particle size is large then the better the particles inhibit heat and specimens are more resistant to heat treatment given. While the composite with a mesh size of 60 to the top there is a crack on the surface of the specimen, which starts from the specimen mesh size of 80, 100, 120, and 150.
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