Why is my polymer clay breaking?

Polymer clay is a versatile and popular medium used for various artistic and crafting projects. It’s frustrating when your polymer clay creations break, and understanding the reasons behind breakage can help you take preventive measures. In this article, we’ll explore some common causes of polymer clay breakage and provide insights into how to avoid this issue.

1. Insufficient Conditioning

Conditioning Matters:

Exploring the role of proper conditioning:

One of the common causes of polymer clay breakage is insufficient conditioning. When polymer clay is not properly conditioned, it can have areas with air pockets or inconsistencies in texture. During baking, these air pockets can expand and cause the clay to crack or break. To prevent this, ensure that you thoroughly condition your clay by kneading it until it’s soft, pliable, and free of air bubbles before starting your project.

2. Baking Temperature and Time

Tempering the Heat:

Understanding baking temperature and time:

Baking polymer clay at incorrect temperatures or for too long can lead to breakage. Overbaking can cause the clay to become brittle and prone to cracking, while underbaking may result in weak spots that can break easily. Follow the manufacturer’s instructions for baking times and temperatures specific to the brand of polymer clay you’re using. Use an oven thermometer to ensure accurate temperature readings and avoid temperature fluctuations during baking.

3. Rapid Temperature Changes

Handling with Care:

Avoiding rapid temperature shifts:

Exposing polymer clay to sudden temperature changes can cause it to crack or break. For example, placing hot polymer clay directly into cold water or vice versa can create stress within the clay and lead to breakage. Allow your polymer clay creations to cool gradually after baking before subjecting them to extreme temperature changes. This will help prevent thermal shock and minimize the risk of breakage.

4. Structural Design and Weak Points

Support and Reinforcement:

Addressing structural concerns:

The design and structure of your polymer clay creations can influence their vulnerability to breakage. Thin and delicate parts, unsupported spans, or weak joints can become areas prone to breakage. Reinforce these weak points with internal supports, armatures, or additional layers of clay. Consider the structural integrity of your design and make adjustments to reduce the risk of breakage.


Understanding the potential causes of polymer clay breakage and taking proactive steps to prevent it can help you create more durable and long-lasting creations. Proper conditioning, accurate baking, careful handling, and thoughtful design are key factors in minimizing the risk of breakage. By incorporating these practices into your polymer clay projects, you can enjoy the process of crafting while ensuring that your creations remain intact and showcase your artistic vision.

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