Bentonite, 1kg

£3.12

Adding bentonite to glazes imparts better dry strength and a harder more durable surface and 1-2% can greatly improve glaze suspension. Adding it to clay bodies binds particles and fills gaps, giving more strength in the green and dry state.

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The most plastic and impermeable of common clay materials. Binds particles together to make bodies stronger in the green and dry state. Produces a more dense mass by its tiny particle size filling the gaps between others. 1 part bentonite can plasticize 10 parts of kaolin. Bentonite bodies are stronger but they dry slower, crack more and fire darker with potential iron specks. Warning – bentonite clay bodies may look dry when they’re not – they must be very slowly dried to prevent steam being produced, creating cracks.

Adding bentonite to glazes imparts better dry strength and a harder more durable surface. 1-2% bentonite can greatly improve glaze suspension. Make into a paste before adding to glaze batches if not added dry to the powder. ?

Weight 1 kg