However, we can have soft and hard within a group that by all accounts is “hard” on a general scale. Step 1: Gather several groups of common objects that can be sorted based on different characteristics. quarter, rock, screw (hard); cotton ball, soft fabric, small pillow (soft); Rough/smooth. Examples of material having lustre or shine are metals such as gold ,silver, copper, aluminium and iron, metal alloys such as steel ,stainless steel ,brass and diamond.. Those materials which have dull appearance are said to have no lustre. These are called properties. Those materials which cannot be easily compressed, cut, bent or scratched are called hard materials. Mixture: A material made of different substances mixed together. Superior and enhanced mechanical properties for stronger stiffer plastic sheet. Properties of Materials. Those materials which can be easily compressed, cut, bent or scratched are called soft materials. These materials are commonly referred to as cemented carbides or simply as carbides as, for example, carbide tools. Wool is soft. Examples: Sponge, Cotton. Also, clear, hard plastic sheets for structural applications. Often overlooked are details such as the material surface … Hard plastics refer to the polystyrene brittle plastic materials. For example: paper, wood, chalk, cotton, plastic, rubber ,cardboard etc. Air is a mixture of oxygen, nitrogen, and other gases. Different materials have different features and ways of behaving. Acrylic This material breaks easily when you bend them, and when dropped onto a hard surface, they make a “click “or the “tink” sounds. Common hard-surface materials are stainless steel, solid surface, laminate, porcelain, and a wide variety of tile and ridged plastic materials. sandpaper, rough fabric like corduroy, bumpy rock (rough); piece of aluminum foil, plastic spoon, piece of silk or other smooth fabric (smooth) When we say "natural materials," the mind leaps immediately to wood, stone, leather, natural fibers. Hard surfaces are a combination of porous and nonporous materials. Here are some examples: Hard/soft. Learn more at Curbell Plastics. There are of course obvious examples of hard and soft, diamond is definitely by all accounts hard, and soft furnishing foam is soft. Examples: Iron, glass. The essential types of hardscape material are: wood, faux-wood (composite decking material), concrete, brick, tile, loose stone (like pebbles, small rocks and gravel), solid stone (in slabs or tiles), and pavers, which are pre-cut shapes that form a paved area by fitting together like interlocking puzzle pieces (usually made of stone or concrete). Strong, stiff engineering plastics. But there are lots of interesting and more "exotic" materials from the natural world that we don't tend to think of, right away, and digging these up and showing them off is one of the things I'm most looking forward to in this month's theme. While real examples of Lonsdaleite contain sufficient impurities to make them softer than diamonds, an impurity-free graphite meteorite striking the Earth would undoubtedly produce material … Classification of material on the basis of hardness and softness For example, steel is hard. 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