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