KS3 Design Technology - Materials
Metals are materials with high electrical conductivity, malleability, and typically a shiny appearance when freshly prepared.
Metals can be extracted from 
.
We can purify some metal ore into 
using heating, or ⚡.
An alloy is a mixture of a pure metal with 🧪.
Metals with iron in them are and can 
. They are more likely to be 🧲.
Timber is wood processed into beams and planks. It comes from trees that are classified as either deciduous or coniferous.
Hardwood are from 
trees, which lose their leaves in autumn, grow more , have density, and are more .
Softwood are from 
trees, which keep their needle-like leaves year-round, grow , have density, and are more.
Manufactured boards are wood products made from natural timber, usually in factories, and are available in large sheets.
Manufactured boards are made from into 📄 in factories.
For example, plywood is thin 
of wood glued together.
MDF is 
, made from wood dust with wax and resin, compressed in high 🔥 and 💪.
Polymers are materials made of long, repeating chains of molecules.
Plastics are synthetic 
derived from 🛢️ like coal, crude oil and gas.
can be 
when reheated. It can be ♻️.
🚫 be remoulded once set because of permanent 🧬 that form when exposed to 🔥 and 💪.
Textiles are flexible materials made of networks of natural or artificial fibers, created by weaving, knitting, or bonding.
Natural fibres come from 🌱 (like ) or 🐑 (like ).
Synthetic fibres are 🏭, often derived from 🛢️. A common example is .
Paper & Boards are sheet materials made from wood pulp or recycled paper. They vary in thickness, weight, and surface finish.
Common paper types include paper for ✏️ and paper for copying designs.
Boards include card used for 📦 and board used for 🖼️.
Smart materials have properties that change in response to external stimuli. Modern materials are developed for specific advanced applications.
Smart materials respond to 🧪 like 🌡️ or 💡.
Modern materials like have high 💪 while being 🪶. Another example is , used in aerospace and medical implants.