Page 58-59 (Materials and properties.) Flashcards
Traditional wooden toys.
Made from harwoods such as beech, oak or maple.
Hard and durable : able to withstand forces.
Safe around children as they do not break or splinter.
Have an attractive appearance and can be brightly painted.
Cooking utensils
Made from stainless steel. Strong and does not rust easily. High melting point and safe around food.
Suitable in the kitchen against moisture and heat.
Polymer seater
Made from theroforming plastics like polypropylene.
Easily moulded into comfortable seats and can be in many colours.
Can be used out side but can be damaged by UV light. Tough, flexible and can withstand people.
Flat pack furniture.
Made from composites such as MDF. Strong so it can withstand forces that are applied to furniture. Uniform texture meaning that it can eaily be cut. Shaped. Has finished applied to make it an attractive furniture.
Hand tools
Made from 1.5% carbon steel.. Hard tough and strong. Making it durable and able to cut other materials without being damaged.
Electrical fittings.
Made from ureaformaldehyde. This thermosetting plastic can be moulded intot the correct shape. It is an electrical insulator.
Wood can be seasoned to strengthen it.
Trees are debarked and moisture is removed to stop it from twisting or rotting. If wood is not seasoned it can easily change shape. If you dry wood too quickly it can shrink and get weaker.Unseasoned wood is used for timber framed buildings as it is far cheaper and easier to work.
Annealing
Heat treating metals can change their properties. Heating metal until it glows red and leving it to slowly cool. This allows it to be softer, more ductile and less brittle. This makes it more malleable (easier to bend and shape.)
Stabilisers
Protect polymers from uv light. Uv light damages the chemical structure of the polymer. Uv light can cause polymers to become brittle, weaken, fade and develop a chalky powder. If you add a chemical stabiliser the structure will be protected.
