What is a Heatproof Bowl & How to Spot if it’s Heatproof

Introduction

Bowls are versatile kitchen utensils that play a crucial role in various culinary activities, ranging from mixing ingredients and tossing salads to serving and even baking. The quality of your bowls is as important as the ingredients themselves, as it directly impacts the outcome of your dishes. In this comprehensive guide, we will explore the concept of heatproof bowls, how to identify them, and the different types that are available.

What are Heatproof Bowls?

Heatproof bowls are specially designed kitchenware that can withstand high temperatures without melting, warping, or burning. Typically, these bowls are heat resistant up to 300 degrees Celsius (572 degrees Fahrenheit). They come in various shapes, sizes, and materials, with stainless steel, ceramic, and glass being the most common choices.

Heatproof bowls of these materials vary in terms of their heat-resistance capabilities, depending on factors such as material composition, thickness, and grade. It’s important to note that heatproof bowls cannot be made of soft plastic, wood, or thin glass, as they lack the required durability to withstand high temperatures. However, they can typically be safely used in ovens, over boilers, on stovetops, or in microwaves at high temperatures.

How to Identify Heatproof Bowls

The easiest way to determine if a bowl is heatproof is by checking for the heat-safe symbol, either on the packaging or on the bowl itself. This symbol may either be a visual representation or clearly stated words indicating its heat safety. If there is no indication of heat resistance, it is not recommended to use the bowl for cooking or exposing it to high heat, as it may pose a risk to your safety and your appliances.

Are Glass Bowls Heatproof?

Glass bowls that are heatproof are typically made with a specific type of glass, such as Pyrex. Pyrex bowls are composed of Borosilicate glass, soda-lime glass, and other materials, which give them the ability to withstand heat without cracking or shattering. The unique thermal expansion coefficient of Pyrex glass allows it to expand and contract less compared to other types of glass, making it more resistant to breakage.

However, even with a Pyrex bowl, it is important to avoid placing it directly over a gas stove’s flame. Uneven heating can cause the bottom of the bowl to become hotter than the sides, leading to breakage. To ensure the heatproof nature of a glass bowl, check for the heat-safe symbol or indications on the bowl itself or its packaging. Thin glass bowls are generally not considered heatproof unless explicitly stated.

Recommended Heatproof Pyrex Bowls

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Are Ceramic Bowls Heatproof?

Ceramic bowls can be heatproof if they have been properly fired at a high enough temperature, typically around 2,000 degrees Fahrenheit. The firing process involves subjecting raw clay to high-temperature heating, transforming it into ceramic. Ceramic bowls have a high melting point, but they are susceptible to temperature variations.

Caution should be exercised when using ceramic bowls, as they should not be placed directly over a heat source, such as an open fire. Additionally, it is not recommended to use high-heat cooking methods with ceramic bowls that have metal rims or decorative features, as they can potentially catch fire due to the metallic elements.

It’s important to note that not all ceramic dishes are equally heatproof. The glaze applied to ceramic bowls may not necessarily be oven safe, even though ceramic itself is described as clay that has been solidified by fire. Different types of ceramics, such as earthenware, bone china, stoneware, and porcelain, have varying heat resistance levels. To determine if a ceramic bowl is heatproof, look for ovenproof markings or symbols on the bowl or its packaging.

Recommended Heatproof Ceramic Bowls

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Are Metal Bowls Heatproof?

Not all metal bowls are heatproof. Stainless steel bowls are generally considered heatproof, especially if they are made from 18/8 or 18/10 grade stainless steel, which has a high resistance to heat.

While solid stainless steel bowls can tolerate temperatures up to 500°F, thin and light stainless steel bowls may not be suitable for high-heat cooking or oven usage. It is crucial to verify if a stainless steel bowl has a heatproof marking before using it for cooking, as it may become discolored or warped at high temperatures.

It is not recommended to microwave food in stainless steel bowls unless the manufacturer explicitly states that they are both heatproof and microwave safe, as it can potentially cause a fire.

Which Types of Bowls are Not Heatproof?

Certain types of bowls are not heatproof and should not be exposed to high temperatures:

1. Plastic Bowls

In general, plastic bowls are not considered heatproof. While there are some silicone and hard plastic bowls that may be heatproof, they are specifically regulated for use in dishwashers and microwaves. Placing plastic bowls in ovens or over open flames is not recommended. When selecting plastic bowls for food use, ensure they are FDA-approved, labeled as food-safe, and toxin-free.

2. Wooden Bowls

While it is generally safe to put hot food in wooden bowls, they should not be subjected to high temperatures in ovens, microwaves, or over open flames. Wood, regardless of whether it is polished, treated, or bare, is a fire hazard.

3. Thin or Ordinary Glass Bowls

To be considered heatproof, glass bowls must meet specific thermodynamic properties and thickness requirements. Not all types of glass possess these properties or can be treated to withstand extreme heat. Thin or ordinary glass bowls are typically not heatproof unless explicitly marked or specified with the oven-safe/heat-safe symbol. Additionally, be cautious of any metallic embellishments on glass bowls that can cause sparks.

4. Ordinary Metal Bowls

Ordinary metal bowls conduct heat and electricity. Placing them in microwaves or dishwashers can cause sparks leading to fires or electrical damage. Putting ordinary metal bowls in ovens may result in warping, discoloration, or damage to your oven.

Sources:

• Pyrex – Wikipedia
• How to tell if a Ceramic Bowl is Ovenproof