Design Technology Materials

What thermosetting plastic is good for electrical casings?

Urea Formaldehyde

Features of Urea Formaldehyde

• Stiff/Hard/Brittle

• Stain resistant

• Scratch resistant

• Toxic fumes released if heated

Where is hardwood from?

Deciduous trees

Where is softwood from?

Coniferous trees

Is oak a hardwood or softwood?

Hardwood

Is mahogany a hardwood or softwood?

Hardwood

Is julutong a hardwood or softwood?

Hardwood

Is balsa a hardwood or softwood?

Hardwood

Is beech a hardwood or softwood?

Hardwood

Is cedar a hardwood or softwood?

Softwood

Is pine a hardwood or softwood?

Softwood

Is ash a hardwood or softwood?

Hardwood

What is balsa used for?

Model making

What is oak used for?

Barrels

What is mahogany used for?

High quality/rich furniture

What is pine used for?

Furniture/Construction

Qualities of mahogany

• Rich dark red colour

• Durable

• Stable

Qualities of oak

• Resistant to wear and tear

• Hard

• Attractive grain

• Strongest and densest hardwood

Qualities of balsa

• Lightweight

• Soft

• Straight grain

Qualities of ash

• Durable

• Shock resistant

Qualities of beech

• Easy to work with

• Straight grain

• Uniform texture

Qualities of pine

• Knotty

• Susceptible to rot

• Lightweight

Qualities of cedar

• Natural resistance to decay

• Natural resistance to insect infestation

Qualities of MDF

• Smooth surface

• Easily shaped

• Comes in large sheets

• Takes paint well

• NOT lightweight

Qualities of plywood

• Parallel top and bottom grain

• Strong

• Stable

• Various thickness

Qualities of hardboard

• Smooth surface

• Tough

Qualities of chipboard

• Strong in all directions

• Not attractive

• Large sheets

What is CFRP?

carbon fibre reinforced plastic

What is GRP?

glass reinforced plastic

Qualities of CFRP

• Polymer base composite

• Lightweight

• Corrosion resistant

• Tough

• Stiff

Qualities of GRP

• Polymer base composite

• Electrical insulator

• Tough

• Lightweight

What is GRP used for?

Water tanks

What is CFRP used for?

Sports equipment

Is low carbon steel ferrous, non ferrous or an alloy?

Ferrous

Is medium carbon steel ferrous, non ferrous or an alloy?

Ferrous

Is cast iron ferrous, non ferrous or an alloy?

Ferrous

Is brass ferrous, non ferrous or an alloy?

Alloy

Is copper ferrous, non ferrous or an alloy?

Non ferrous

Is tin ferrous, non ferrous or an alloy?

Non ferrous

Is zinc ferrous, non ferrous or an alloy?

Non ferrous

Is stainless steel ferrous, non ferrous or an alloy?

Alloy

Is aluminium ferrous, non ferrous or an alloy?

Non ferrous

Qualities of mild steel

• Ductile

• Tough

• Malleable

• Poor resistance to corrosion

Qualities of medium carbon steel

• Harder than mild

• But less tough than mild

• Less malleable

• Less ductile

Qualities of cast iron

• Good under compression

• Hard outer skin

What are the traits of ferrous metals?

• Magnetic

• Can rust

• HAS IRON

Qualities of brass

• Corrosion resistant

• Electrical conductor

• Thermal conductor

• Hard

• Malleable

• Ductile

Qualities of aluminium

• Lightweight

• Ductile

• Malleable

Qualities of copper

• Soft

• Ductile

• Malleable

Qualities of zinc

• Good corrosion resistance

Qualities of stainless steel

• Tough

• Hard

• Smooth