What are non-metallic materials?

Non-metallic materials are materials that are not metals. They usually do not look shiny like metal, do not bend easily into thin sheets, and often do not carry electricity well. Examples are wood, plastic, glass, rubber, paper, ceramics and fabrics.

Key properties (simple words)

• Conductivity: Most non-metals do not carry electricity or heat well (they are poor conductors). Good for insulation.
• Brittle or flexible: Some are hard and break easily (glass), others bend (rubber, some plastics).
• Transparent or opaque: Glass is transparent (see-through); wood and metals are not.
• Absorbent: Paper and cloth absorb water; plastics usually do not.
• Resistant to rust: Non-metals do not rust like iron (useful outdoors).
• Biodegradable or not: Wood and cotton decay over time; many plastics do not and pollute the environment.

Everyday uses — examples from Kenya

• Wood: building small houses, furniture, school desks.
• Plastic: water bottles, food containers, tuk-tuk parts.
• Glass: bottles, windows in houses and schools.
• Ceramics: plates, cups, floor and roof tiles.
• Paper/cardboard: books, school exercise books, packaging.
• Sisal (natural fibre grown in Kenya): ropes, mats and baskets.
• Concrete and bricks (made from clay and cement): building walls, roads and jikos (stoves).

Simple class activities (safe & fun)

1. Float or sink — Put small samples (wood, plastic bottle lid, stone) in water. Which float? Which sink?
2. Transparency test — Use a torch and try to shine light through glass, plastic, paper and wood. Can light pass?
3. Absorbency test — Drop a little water on cotton, paper, plastic and rubber. Which absorb water?
4. Bend test (flexibility) — Gently bend thin plastic, paper and a twig. Which bend without breaking?
5. Simple conductivity test — With teacher's help only: use a small bulb, battery and wires. Insert the material into the circuit to see if the bulb lights. (Use safe low-voltage parts and teacher supervision.)

Safety: Do not use broken glass. Ask the teacher for help with electricity and sharp objects.

Why learn about non-metallic materials?

• They are part of daily life: from clothes to houses.
• Choosing the right material keeps us safe — for example, insulators stop electric shocks.
• Knowing which materials are biodegradable helps protect the environment.

Quick check (quiz)

Try these. Answers are in the box below.

1. Give two examples of natural non-metallic materials.
2. Which material is good for making windows?
3. Name one property of plastics that can be bad for the environment.