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         <description><![CDATA[Conductivity
Corrosion Resistance
Density
Ductility / Malleability
Elasticity / Stiffness
Fracture Toughness
Hardness
Plasticity
Strength, Fatigue
Strength, Shear
Strength, Tensile
Strength, Yield
Toughness
Wear Resistance]]></description>
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         <pubDate>2021-01-13 03:42:15 UTC</pubDate>
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         <title>HardnessThe hardness of a material is how difficult it is to cut into.Solids can be hard because their particles are held togetherby very strong bonds. The hardest material found in nature isdiamond. Diamond can cut most materials and this explains why many industrial drills have diamond tips.</title>
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         <pubDate>2021-01-13 03:50:37 UTC</pubDate>
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