Air Dry VS Polymer: Exploring The Clay Differences

When it comes to crafting and modeling, two popular mediums that often come into play are air dry clay and polymer clay. Both materials are versatile and fun to use, but they have distinct characteristics that set them apart. This article will delve into the differences between air dry clay and polymer clay, helping you make an informed decision based on your artistic needs and preferences.

Both clays share some common ground, such as their ability to be molded into various shapes and forms. However, their composition, working properties, and finished results are quite different. Let's explore these aspects in detail.

Composition and Workability

Air dry clay, as the name suggests, is a natural clay that dries out at room temperature. It's typically composed of natural materials like kaolin, ball clay, and flint, along with water. Polymer clay, on the other hand, is a synthetic material made from polyvinyl chloride (PVC) plasticized withदार dioctyl phthalate. It doesn't dry out like air dry clay; instead, it hardens when baked in an oven at high temperatures.

The workability of these clays is significantly different due to their compositions. Air dry clay is usually softer and more malleable right out of the package, making it easier to knead and shape. Polymer clay, however, is often stiffer and requires conditioning (kneading) to make it soft and pliable. Once conditioned, though, polymer clay holds its shape remarkably well, allowing for intricate details and fine sculpting.

Drying Versus Baking

Air dry clay air dries, which means it hardens naturally over time when exposed to air. The drying process can take anywhere from a few hours to a couple of days, depending on the climate, thickness, and size of the piece. Once dried, air dry clay remains flexible but may become brittle if not sealed properly. Polymer clay, as mentioned earlier, requires baking to harden. This process takes about 15-30 minutes in a regular home oven. After baking, polymer clay becomes completely rigid and permanent.

The drying or baking process also affects the final size of the pieces. Air dry clay may shrink slightly during the drying process, while polymer clay pieces will shrink a little during baking. However, polymer clay has a more noticeable shrinkage factor, which should be considered when creating delicate or large-scale pieces.

Finished Results

The finished results of air dry clay and polymer clay pieces are also quite distinct. Air dry clay has a more natural, earthy appearance. It begins as a light grey color and darkens as it dries, often taking on a terracotta-like hue. Once dried, air dry clay can be sanded, painted, or stained to achieve various tones and effects. Polymer clay, when baked, transforms into a smooth, plastic-like material with a consistent color throughout. It can be painted, but its surface is already glossy, and it accepts colorant very well, allowing for vibrant, true-to-color results.

Another unique characteristic of polymer clay is its ability to be combined with other mediums like metal clay, fabric, or wood to create mixed-media artworks. However, it's crucial to note that polymer clay's high PVC content can degrade or melt under extreme heat, making it unsuitable for applications where high temperatures are involved.

Safety and Environmental Considerations

When comparing air dry clay and polymer clay, it's essential to consider their safety and environmental impact. Air dry clay is generally considered non-toxic, as it's composed mainly of natural materials. However, when working with it, ensure your workspace is well-ventilated, as it may release dust during handling. Polymer clay, being a synthetic material, may contain harmful gases when heated, so proper ventilation is crucial during baking. Additionally, polymer clay should never be ingested or applied directly to the skin due to its chemical composition.

From an environmental standpoint, air dry clay is typically more eco-friendly than polymer clay. Air dry clay is primarily composed of natural materials and is biodegradable. In contrast, polymer clay is made from petroleum-derived plastic, making it non-biodegradable and difficult to dispose of responsibly. Many polymer clay brands, however, are now offering recycled or eco-friendly alternatives to mitigate their environmental impact.

Ultimately, the choice between air dry clay and polymer clay depends on your artistic goals, the time and materials you have at your disposal, and the specific effects you want to achieve. Both mediums offer a wealth of creative opportunities and can be used separately or combined to create unique, captivating artworks. So go ahead, experiment, and let your creativity run wild!