Hard plastics refer to the polystyrene brittle plastic materials. This material breaks easily when you bend them, and when dropped onto a hard surface, they make a “click “or the “tink” sounds. 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. For example, steel is hard. Step 1: Gather several groups of common objects that can be sorted based on different characteristics. Here are some examples: Hard/soft. Strong, stiff engineering plastics. Hard surfaces are a combination of porous and nonporous materials. Some of the more common porous surfaces include laminate, granite, and various types of tile and plastic materials. One of the examples of the hard plastic materials is the plastic for the model kit. Superior and enhanced mechanical properties for stronger stiffer plastic sheet. sandpaper, rough fabric like corduroy, bumpy rock (rough); piece of aluminum foil, plastic spoon, piece of silk or other smooth fabric (smooth) Mixture: A material made of different substances mixed together. These are called properties. 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). Those materials which cannot be easily compressed, cut, bent or scratched are called hard materials. There are of course obvious examples of hard and soft, diamond is definitely by all accounts hard, and soft furnishing foam is soft. Wool is soft. Common hard-surface materials are stainless steel, solid surface, laminate, porcelain, and a wide variety of tile and ridged plastic materials. Often overlooked are details such as the material surface … Those materials which can be easily compressed, cut, bent or scratched are called soft materials. For example: paper, wood, chalk, cotton, plastic, rubber ,cardboard etc. Different materials have different features and ways of behaving. Air is a mixture of oxygen, nitrogen, and other gases. 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 … Examples: Sponge, Cotton. Examples: Iron, glass. 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. quarter, rock, screw (hard); cotton ball, soft fabric, small pillow (soft); Rough/smooth. These materials are commonly referred to as cemented carbides or simply as carbides as, for example, carbide tools. Acrylic Learn more at Curbell Plastics. Also, clear, hard plastic sheets for structural applications. Preparation. Properties of Materials. However, we can have soft and hard within a group that by all accounts is “hard” on a general scale. When we say "natural materials," the mind leaps immediately to wood, stone, leather, natural fibers. Classification of material on the basis of hardness and softness Classification of material on the basis of hardness and softness hard plastics refer to polystyrene. 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