3.1.6 Materials and their working properties GapFill

Papers come in different types but they are all measured and classified by  originsizecolourgsm, which is a rough guide to their thickness. One type of paper is described as having a bit of surface texture, creamy and white in colour which is used for drawing on with ink and paints. This type of material is known as  inkjet papertracing paperduplex boardcartridge paper. A form of paper that is sandwiched between two outer layers that has excellent impact resistance is called  duplex boardinkjet cardcorrugated cardsolid white board.

Timbers are classified as hardwoods, softwoods or manufactured boards.  balsaPineashmahogany is an example of a softwood whereas  MDFpineoakspruce is an example of a hardwood.

Mild steel is a ferrous metal, which means it contains  brassironzincaluminium which also means that it will rust and develop a reddish surface oxide if left untreated. Non-ferrous metals do not contain iron and are therefore not  strongmagneticmalleablecorrosion resistant.

Polymers are made up from long chains of  cross linksoilmonomerscarbon and are classified as being either thermoforming or thermosetting polymers.  AcrylicUrea formaldehydePolypropylenePVC is an example of a thermosetting polymer.

Textiles can be synthetic or natural.  AcrylicSilkElastaneLycra is an example of a natural fibre. Fabrics that are made by looping warp and weft yarns together are known as  non-wovenwovenknittedbonded fabrics.

All materials have their own specific physical properties. A material that is resistant to abrasive wear and indentation is said to have the property of  toughnesselasticityhardnessductility whereas a material that returns to its original shape after a deforming force has been removed is said to have  fusibilitytoughnesstoughnesselasticity.