What are ceramics?

Ceramics are objects made from clay and other materials that are shaped and then heated (fired) in a kiln. After firing they become hard and are useful for cooking pots, water jars, tiles, bricks and art.

Common raw materials

• Clay — the main material. Different kinds: earthenware, stoneware, porcelain/kaolin.
• Water — mixes with clay to make it soft and workable.
• Grog/sand — small fired clay or sand added to reduce cracking during drying and firing.
• Fluxes — materials that help melt the surface during firing (e.g., feldspar).
• Glazes — glass-like coatings that make ceramics waterproof and decorative.

Types of clay (simple)

Key properties to know

• Plasticity — how easily the clay can be shaped.
• Porosity — how much water it absorbs after firing (glaze reduces porosity).
• Strength — how hard and durable the fired ceramic is.
• Firing temperature — different clays need different heat (earthenware ~1000–1150°C; stoneware ~1200–1300°C).

Basic production steps (simple)

1. Prepare clay: remove stones, add water and grog, wedge to remove air.
2. Shape: handbuilding (pinch, coil, slab), wheel throwing, or press into moulds.
3. Dry: let the piece dry slowly until leather-hard, then bone-dry.
4. Bisque firing: first firing to harden the ceramic.
5. Glaze: apply glaze for colour and waterproofing.
6. Glaze firing: second firing to melt the glaze onto the ceramic.

Tools and equipment

• Wooden modelling tools, wire cutter, sponge, rolling pin, needle tool.
• Potter's wheel (for throwing) — common in schools or craft centres.
• Kiln — for firing. In Kenya, small local kilns or community kilns are used in craft markets.

Local uses in Kenya

Ceramics are used across Kenya for cooking pots, water storage jars, roof tiles, bricks and decorative items sold in craft markets. Many communities make traditional pots for daily life and for sale to tourists.

Safety rules (important)

• Wear a dust mask when working with dry clay or mixing — clay dust can harm lungs.
• Use gloves when handling glazes and chemicals.
• Keep the kiln area clear and let only trained people operate the kiln.
• Dry pieces slowly to avoid cracking — do not fire wet clay.

Simple classroom activity — Make a pinch pot

1. Take a ball of clay (about the size of an orange).
2. Press your thumb into the centre and pinch the walls evenly with your fingers.
3. Smooth the rim with a wet finger and decorate with simple lines or dots.
4. Let it dry slowly for a few days, then ask your teacher about firing (school or community kiln).

Mini-quiz (answer with your teacher)

1. What are three things you need to make ceramics?
2. Why should you dry clay slowly before firing?
3. Give one use of ceramics in Kenyan homes or buildings.

Glossary (simple)

• Clay: soft earth used to make pottery.
• Glaze: a glass coating for ceramics.
• Kiln: oven for firing pottery.
• Bisque: pottery after the first firing.