Quick Answer
Coil pottery can be strong enough for heavy use if properly made and fired, but its durability depends on various factors such as clay quality, firing temperature, and post-firing treatment.
Coil Pottery Strength Factors
Coil pottery’s strength is influenced by the coil’s thickness, the number of coils used, and the firing temperature. A general rule of thumb is to use at least 3-5 coils for a sturdy vessel, with each coil approximately 1-2 cm (0.4-0.8 in) thick. The optimal firing temperature for coil pottery is between 800-1000°C (1472-1832°F), which allows for sufficient vitrification and strength development.
Clay Sourcing and Treatment
The quality of the clay used is crucial for the overall strength and durability of coil pottery. Natural clays with high silica content tend to produce stronger vessels. It’s essential to source clay from areas with minimal contamination and to process it properly, removing any impurities and excess moisture. Adding a small amount of natural materials like sawdust or plant fibers can enhance the clay’s strength and waterproofing properties.
Firing Techniques and Waterproofing
Pit firing is a suitable method for coil pottery, as it allows for a more natural and controlled firing process. To achieve waterproofing, apply a layer of natural wax or plant resin to the vessel after firing, followed by a layer of natural oils or beeswax. This will help protect the clay from moisture and extend its lifespan. Additionally, applying a thin layer of natural materials like pine tar or linseed oil can further enhance the vessel’s durability and water resistance.
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