Mechanical and chemical properties of materials for roofing

To the mechanical properties of the material include its strength, elasticity, plasticity, brittleness, impact resistance and hardness.

Strength is the ability of the material to resist degradation caused by external forces causing it internal stress. Strength of the material is characterized by a tensile strength at 3 types of exposure to - compression, bending and stretching.

Elasticity - the ability of the material, under the influence of any deformirovannnogo loads, take the original shape and size. The maximum stress at which the material still has elasticity, called the elastic limit. For elastic materials include rubber, steel and wood.

Fragility - property of the material under the action of external forces instantly destroyed without significant plastic deformation. Brittle materials include brick, natural stone, concrete, glass, etc.

Plasticity - a material property change under load shape and size without the formation of cracks and breaks, and save the changed shape and size after removal of the load. This property is the opposite of elasticity. For plastic materials include asphalt, clay dough, etc.

Impact Resistance
Impact resistance - the ability of the material to resist degradation by shock. Poor resistance to shock brittle materials.

Property of a material to resist the penetration of other, more solid material called hardness. It is determined by the depth of the indentation in a material steel ball, cone or pyramid based on the resulting print.
So come in determining the hardness of the wood, metals, plastics (except porous and concrete). Determine the hardness of stone materials on a scale of hardness.

Material property back to its original shape after the load or termination of ongoing efforts is called flexibility.

Chemical properties of materials
Chemical properties of materials to include solubility, chemical and biological stability, fracture.

Properties of materials dissolved in liquids (water, oil, turpentine, gasoline, etc.) is called solubility.
This ability of materials can be either positive or negative. If the synthetic material is destroyed by solvent, it has a negative solubility. In the manufacture of cold asphalt mastic property is used to dissolve in gasoline, resulting in an opportunity to apply the mastic to the base with a thin layer. This is a positive characteristic solubility.
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