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    • 1. Types of Clay
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  • POTTERY FOR BEGINNERS
  • 2. Working with clay

2. Working with clay

Clay

PLASTICITY is the ability of clay to hold the shape without breaking apart or cracking while being formed. It is a unique and valuable quality of clay.

The key factors that affect the plasticity of clay:

Shape of Particles - large (flat) surface area is more plastic than smaller ones.

Size of Particle – finer particles is more plastic than large ones.

The attraction between Particles – electrolyte and deflocculate such as soda ash, sodium silicate good for slip casting, but will weaken the attraction between particles that cause difficulty for throwing and hand-building.

Water Content - clay too dry will not from well and crack easily, clay too wet will feel stickily and slumps easily.

Wedging Preparation – kneading the clay not only helps to remove air pockets but also makes the moisture/water content of clay evenly to work with.

Moreover, by adding Organic Matter Content to Clay - small amounts such as nylon fibers or paper lumps are an advantage (for hand building and construction bonding), but too much will increase the shrinkage and cause rough textures.

  • 2.1 Tests for Clay Bodies
  • 2.2 Plasticity Test
  • 2.3 Shrinkage Test
  • 2.4 Porosity Test
  • 2.5 Sensible Rules for Handling Ceramic Materials
  • 2.6 Color & Texture Tests
  • 2.7 Wedging Clay

Book traversal links for 2. Working with clay

  • ❮ 1.5 Porcelain
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  • 2.1 Tests for Clay Bodies ❯

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