Are you considering getting a handmade mug but aren't sure if it's dishwasher safe? Unlike mass-produced tableware, handmade ceramics usually don’t come with symbols or labels indicating whether they can go in the dishwasher. If you've ever wondered why some makers recommend handwashing their ceramics, here's the reason why.
In part 1, I discussed how unglazed areas of a mug can absorb small amounts of water and eventually weaken the mug, even after firing at high temperatures.
In this post, let's dive into the durability of glaze. Glaze plays a vital role in the longevity of ceramic pieces, especially when they’re meant for everyday use like mugs, bowls, or plates.
What Does Glaze Do?
Glaze is a glass-like coating that is applied to the surface of ceramics before the final firing. It creates a smooth, sealed layer that:
Protects the Clay Body: Glaze acts as a barrier, preventing water, oils, and stains from penetrating the porous clay beneath. This makes the ceramic more durable and suitable for repeated use.
Enhances Strength: The glaze layer adds structural integrity, helping the ceramic withstand scratches, impacts, and the high temperatures of dishwashers and microwaves.
Durability Factors of Glaze
Firing Temperature: Glazes fired at higher temperatures, such as those on stoneware or porcelain, are more durable because the clay and glaze fuse more completely. Low-fire glazes, while vibrant and colourful, may be less resilient to wear and tear.
Glaze Composition: A well-formulated glaze creates a strong, even coating. Poor-quality or improperly mixed glazes may crack, chip, or craze (develop fine cracks) over time, reducing the piece’s durability.
Glaze Application: The way the glaze is applied affects its longevity. A thick, even layer ensures maximum protection, while thin or uneven application may leave vulnerable spots.
Wear Resistance: A high-quality glaze resists scratching and scuffing from utensils or stacking. Durable glazes are ideal for everyday use, maintaining their shine and functionality even with frequent handling.
Glaze in Functional Ceramics
For functional ceramics like mugs or plates, glaze durability is critical. A durable glaze ensures that:
The piece remains food-safe and hygienic, as no liquids or food particles seep into the clay.
It can handle temperature changes, like going from hot beverages to a cool wash in the dishwasher, without cracking or crazing.
The aesthetic appeal of the piece lasts, even with the abrasive from the dishwasher detergent.
In summary, a good glaze isn’t just about making ceramics beautiful—it’s essential for creating long-lasting, functional pieces that can withstand daily use.
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