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