Yes, natural clay is heat resistant to a certain extent, depending on the type of clay and the firing process it undergoes.
Natural clay's heat resistance is determined by its composition and the temperature at which it's fired. Different types of clay can withstand different levels of heat. For example, wild clay can generally withstand temperatures up to 1000°C and be used to make earthenware.
Here's a breakdown:
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Earthenware Clay: As mentioned, some wild clays can be used to produce earthenware, which can generally withstand temperatures up to around 1000°C. Flower pots are a common example of earthenware.
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Stoneware Clay: To achieve stoneware, which is more durable and heat-resistant, the clay needs to be fired at higher temperatures. If a clay successfully survives a bisque firing (typically at lower temperatures), it can be fired again at stoneware temperatures.
It's important to note that if you are unsure about the heat resistance of a particular clay, it's best to test it in a controlled environment, like a kiln, using a safety bowl to contain any potential issues during firing. This helps avoid damage if the clay isn't suitable for high temperatures.
