Does polymer clay become hard?

Polymer clay is a versatile and popular crafting material known for its ability to transform into durable and long-lasting creations. Whether you’re sculpting figurines, creating jewelry, or crafting decorative items, one of the essential characteristics of polymer clay is its ability to become hard and solid. In this article, we’ll explore the process by which polymer clay becomes hard and discuss the factors that contribute to its lasting strength.

The Baking Process

The key transformation that polymer clay undergoes to become hard is the baking process. Polymer clay is composed of a mixture of PVC (polyvinyl chloride) particles, plasticizers, and pigments. The plasticizers give the clay its soft and pliable texture, allowing it to be shaped and molded easily. However, the plasticizers need to be removed to create a solid and rigid structure.

When polymer clay is baked in an oven at the appropriate temperature and for the specified duration, a chemical reaction occurs. This reaction causes the plasticizers to evaporate from the clay, leaving behind a solid and hard piece of artwork. As the polymer clay cures during baking, the particles fuse together, creating a strong bond and solidifying the shape of the object.

Factors Affecting Hardness

Several factors can influence the hardness of polymer clay creations:

  • Baking Temperature: Baking polymer clay at the correct temperature is crucial. Baking at too low a temperature may result in the clay remaining soft, while baking at too high a temperature can lead to burning or discoloration.
  • Baking Duration: Polymer clay must be baked for the appropriate amount of time to ensure that the plasticizers are completely removed. Underbaking can result in a piece that is not fully hardened.
  • Thickness of the Piece: Thicker pieces of polymer clay may require longer baking times to ensure that the heat penetrates through the entire piece and hardens it uniformly.
  • Quality of the Clay: The quality and brand of polymer clay can impact the final hardness. High-quality polymer clay from reputable brands is more likely to produce consistent and durable results.

Testing Hardness

If you’re unsure whether your polymer clay creation has become fully hard after baking, you can perform a simple test. Allow the piece to cool completely after baking, and then gently tap it with your fingernail. A fully hardened piece will produce a solid, hard sound when tapped, while an underbaked piece may produce a softer, slightly hollow sound.


In summary, polymer clay becomes hard through the baking process, which removes the plasticizers and fuses the clay particles together. Proper baking temperature, duration, and thickness of the piece are essential factors in achieving the desired hardness. With correct baking techniques and attention to detail, polymer clay creations can transform from soft and pliable pieces into durable and solid works of art that can be enjoyed for years to come.

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