DT materials OCR (copy)

Paper/board, wood, metal, polymers, fabrics

absorbency, density, fusibility, electrical conductivity, thermal conductivity

strength, hardness, malleability, toughness, elasticity

weighs over 200 gsm

weighs under 200 gsm

grid paper, cartridge paper, tracing paper

scale drawings, quick sketches

drawings, pencil, charcoal, paintings

copying, tracing

corrugated card, solid white board, inkjet card

packaging and boxes

high quality packaging, printing, book covers

high quality photographs

hardwoods, softwoods, man-made

come from a broad-leafed deciduous tree that loses its leaves over winter

oak, maple, willow

come from conifers: evergreen trees that keep their needles all year round

pine, cedar, spruce

sheets of timber made by gluing either wood fibres or wood layers together

MDF, plywood, block board

ferrous, non-ferrous, alloys

contains iron, almost always magnetic

carbon steel, cast iron, wrought iron

do not contain iron, not magnetic

copper, aluminium, tin

metals that have been mixed together, combined properties

mining/extraction, forming, recycling

metals extracted from the earth are often mixed with others. these are separated by chemical reactions at heat to get the desired metal

after extraction, the metal is melted down and cast/formed into the desired product

at the end of its usable life, metal can be recycled by melting it down and reforming it. this reduces the amount of new metal needed

thermoforming, thermosetting

they contain no cross linkage molecules: can be easily melted, moulded, and reformed. they are recyclable

PLA, ABS, acrylic

undergo a chemical change when formed: permanently rigid, resistant to heat, not recyclable

epoxy resin, melanin formaldehyde, polyester resin

natural fibres, synthetic fibres, mixed fibres

come from biological sources. renewable and biodegradable

silk (lightweight), cotton (soft)

made from chemical sources/fossil fuels. Not sustainable/biodegradable

polyester (durable), nylon (non-absorbent)polyester (durable), nylon (non-absorbent)polyester (durable), nylon (non-absorbent)

2 or more fibres spun together to produce yarn. combines different fibres with desirable properties

polycotton (durable), terrywool (elasticity)

woven, non-woven, knitted

interlocking two sets of yarn at 90 degrees. fabrics tend to be very strong. used in clothes

fibres are bonded by mechanical, chemical, or thermal method. used in disposable cloths

interlocking loops of yarn together. used in clothes

weft knit, warp knit

stretchy and warm, can unravel

‘weft can go left‘

less stretchy, unlikely to unravel

engineered for performance, not aesthetics

heat and flame resistant

racing drivers, fire people, astronauts, oven gloves

resistant to abrasion and damage by sharp/pointed objects

stab/bullet resistant vests for police, car/motorcycle tyres

wicks water away from body, improves breathability

bedding, sportswear, uniforms, underwear

polymorph, flexi ply, teflon

can be moulded/remoulded at 60 degrees in water

modelling, rapid prototyping

plywood that is very flexible, easily bent

furniture

non-stick pans

respond to external stimuli

SMA, thermochromics pigment, photochromic material

glasses, springs

colour changing mugs

car windshields, glasses

kevlar (bullet proof vests), glass reinforces plastic (boats)