When it comes to kitchenware, stoneware is a popular and durable choice due to its rustic appeal and sturdy construction. It’s commonly used for baking, serving, and even storing food.
But a common question arises among users: Can stoneware go in the microwave?
The answer is generally yes, but with a few important considerations to ensure both the safety of the dish and the longevity of the stoneware.
In this blog post, we’ll explore the factors that determine whether stoneware can go in the microwave, the potential risks involved, and some helpful tips on how to safely microwave stoneware without damaging it or your microwave.
What Is Stoneware?
Stoneware is a type of ceramic made from refined, high-quality clay that is fired at a high temperature (about 2150°F to 2330°F or 1170°C to 1270°C).
This process makes the material non-porous, durable, and able to withstand a wide range of temperatures.
Key characteristics of stoneware include:
- Dense and heavy construction
- Slightly porous surface, although often glazed to become impermeable
- Natural earthen tones that add a rustic feel to kitchens and dining tables
- Heat resistance due to its firing process
Because of these traits, stoneware is commonly used in bakeware, dinnerware, and decorative kitchen pieces. But how does it fare in the microwave?
Is Stoneware Microwave-Safe?
Yes, most stoneware is microwave-safe, but not all stoneware pieces are created equal. Whether stoneware can go into the microwave depends on several factors:
Glazing and Coating
Some stoneware is coated with a glaze that contains metallic elements, which can cause sparks or damage your microwave. Always check for any metallic sheen or colouring in the glaze that could indicate the presence of metal.
Manufacturer’s Guidelines
Many stoneware products come with specific guidelines from the manufacturer. These instructions will indicate whether the item is microwave-safe. It’s essential to check for the microwave-safe label before using it.
Heat Retention
Stoneware heats up slowly but retains heat well, which means it can become extremely hot in the microwave. While this property makes it excellent for keeping food warm, it also poses a risk of burns when handling the dish. Always use oven mitts or heat-resistant pads when taking stoneware out of the microwave.
Porosity
Older or handmade stoneware that hasn’t been fired at a high enough temperature might be more porous. Microwaving highly porous stoneware could cause moisture to get trapped inside, leading to cracking or even breaking of the dish.
How to Safely Microwave Stoneware
To prevent damage to your stoneware or microwave, it’s important to follow some basic guidelines when microwaving stoneware:
Check for Microwave-Safe Label
Always check the bottom of the stoneware or its packaging for a microwave-safe label. If it’s not marked as microwave-safe, assume it’s better not to use it in the microwave.
Inspect the Glaze
Avoid using stoneware with visible metallic or reflective glazes. Metallic elements can cause arcing (sparks) in the microwave, which can damage both the dish and the microwave itself.
Heat in Short Intervals
Stoneware tends to heat unevenly, so it’s a good idea to heat food in shorter bursts. Pause the microwave every 30 seconds or so to check the temperature of the food and the dish. This will also prevent overheating, which can crack the stoneware.
Avoid Sudden Temperature Changes
Stoneware is sensitive to sudden changes in temperature, which can cause it to crack. Never place cold stoneware straight into a hot microwave or remove hot stoneware and immediately place it on a cold surface like a granite countertop or sink.
Use Microwave-Safe Covers
If you’re concerned about food splattering or uneven heating, use a microwave-safe cover to trap heat and distribute it more evenly across the food. Avoid tightly sealing containers or dishes, as stoneware can trap moisture, which could lead to breakage.
Handle with Care
Because stoneware retains heat well, it can become very hot during microwaving. Always use oven mitts or a thick kitchen towel when handling hot stoneware to avoid burns.
Potential Risks of Microwaving Stoneware
While stoneware is generally safe to use in the microwave, there are some risks associated with microwaving it improperly:
Cracking and Breaking
Microwaving stoneware that has tiny cracks, chips, or hairline fractures can cause further damage. The heat from the microwave may cause the cracks to expand, leading to breaking or shattering.
Moisture Retention
Porous stoneware can absorb moisture over time. When microwaved, the moisture trapped in the ceramic can turn into steam, potentially causing the stoneware to crack or explode.
Glaze Leaching
Some older or low-quality stoneware may be glazed with materials that could leach harmful chemicals into your food when heated in a microwave. This is particularly a concern with handmade or vintage stoneware.
Our Final Take
In most cases, stoneware is safe to use in the microwave, provided it meets certain criteria and is used correctly.
To ensure the best experience and protect your stoneware (and microwave), always check for the microwave-safe label, avoid stoneware with metallic glazes, and handle the dish carefully after heating due to its excellent heat retention properties.
If you’re ever unsure about whether your stoneware can go in the microwave, err on the side of caution by using it only in the oven or for serving.
With proper care and attention, stoneware can remain a long-lasting and versatile addition to your kitchen.