Can You Use Glass in Instant Pot?
If you are wondering whether you can use glass in Instant Pot, the short answer is: sometimes, but only in very specific situations.
The bigger issue is not whether glass can fit inside the inner pot, but whether it can handle rapid pressure changes, high heat, and direct contact with the cooking environment.
Instant Pot pressure cookers are designed around stainless steel cookware, not glass.
That difference matters because glass behaves very differently from metal when exposed to pressure, thermal shock, and long cooking times.
What the Instant Pot Cooking Environment Demands
An Instant Pot combines sealed pressure, steam, moisture, and elevated temperatures.
Inside the sealed chamber, food cooks faster because pressure raises the boiling point of water.
That environment is safe for the appliance’s stainless steel inner pot, but it can be stressful for glass containers.
In most Instant Pot models, the inner pot reaches temperatures well above standard stovetop simmering conditions.
A container placed inside must handle:
- High heat from steam and hot liquid
- Rapid temperature changes during pressurizing and depressurizing
- Weight and movement from bubbling liquid
- Extended cook times under pressure
That combination is why cookware materials matter so much in pressure cooking.
Can You Use Glass in Instant Pot for Pressure Cooking?
Using ordinary glass in an Instant Pot for pressure cooking is not recommended.
Standard glass jars, drinking glasses, and most bakeware are not designed to withstand the stress of pressurized cooking.
They may crack, shatter, or fail without warning.
Even when glass looks sturdy, pressure cooking adds hazards that are different from oven baking.
In an oven, heat is usually more gradual and the container is not under pressure.
In an Instant Pot, steam pressure and fast temperature changes can create thermal shock, which is one of the most common reasons glass breaks.
Why thermal shock is the main risk?
Thermal shock happens when glass changes temperature too quickly.
For example, a cold glass container placed into a hot Instant Pot can expand unevenly and crack.
The reverse is also true: hot glass exposed to rapid cooling can fail.
This risk is especially relevant when using glass with cold ingredients, refrigerated sauces, or recipes that require quick pressure release.
Which Glass Types Are More Heat Resistant?
Not all glass is equal.
Some types are engineered for higher heat resistance and are more likely to survive in a controlled cooking setting.
Still, “more heat resistant” does not automatically mean “safe for Instant Pot pressure cooking.”
Borosilicate glass
Borosilicate glass, used in some laboratory ware and specialty bakeware, handles temperature changes better than standard soda-lime glass.
It is less likely to crack from thermal shock, which is why it is often considered the strongest glass option for hot cooking applications.
Even so, it is not universally approved for pressure cooking.
Always check the manufacturer’s rating, because pressure and steam can exceed what the product was tested for.
Tempered glass
Tempered glass is stronger than regular glass because it is heat-treated during manufacturing.
It is common in lids and some dishes, but its suitability depends on the exact product.
Tempered glass can still break under sudden stress, especially if it is not designed for immersion in boiling liquid or pressure conditions.
Oven-safe glass
Oven-safe glass is intended for baking, not necessarily for sealed pressure cooking.
Products such as some Pyrex dishes can handle oven heat, but oven-safe labeling alone does not guarantee Instant Pot compatibility.
When Glass May Be Acceptable in an Instant Pot
In limited cases, glass may be used inside an Instant Pot if the item is explicitly rated for pressure-cooking use by the manufacturer.
This is uncommon.
Most users will not find a glass container labeled for direct pressure cooking in a domestic appliance.
Glass may be more acceptable for non-pressure tasks such as:
- Using a glass lid on a compatible accessory pot when pressure is not being used
- Setting a small heat-safe glass ramekin on a trivet for steaming, if the manufacturer approves it
- Cooking in a water bath where the glass is fully rated for the temperature and method
For any of these, the manufacturer’s instructions matter more than the general reputation of the material.
If the package does not mention pressure cooking or Instant Pot use, assume it is not approved.
What About Glass Jars for Yogurt, Custards, or Pot-in-Pot Cooking?
Many Instant Pot users want to use glass jars for yogurt, cheesecake, custards, or pot-in-pot meals.
This is where caution is essential.
While some recipes circulate online using glass containers, success often depends on the exact jar, the recipe, and the temperature changes involved.
For pot-in-pot cooking, stainless steel or silicone containers are usually preferred because they are less prone to breakage.
If glass is used, it should be heat-safe, free of chips or scratches, and placed on a trivet so it does not sit directly on the inner pot.
Glass jars are especially risky when:
- They come from the refrigerator and are placed directly into a hot appliance
- They are filled too tightly, leaving no room for expansion
- They are used with a quick pressure release
- They are exposed to uneven heating from thick sauces or dense batters
Safer Alternatives to Glass in Instant Pot
If your goal is reliable pressure cooking, there are better options than glass.
These materials are widely used because they handle heat and pressure more predictably.
Stainless steel
Stainless steel is the best all-around choice for Instant Pot use.
It is durable, nonreactive, and built to handle pressure-cooking conditions.
It is also the material used for many official Instant Pot accessories and insert pots.
Silicone
Food-grade silicone is flexible, lightweight, and heat resistant.
Silicone molds and containers can work well for desserts, egg bites, and portioned foods, especially in pot-in-pot cooking.
Choose silicone products rated for high heat and food contact.
Ceramic with a pressure-safe rating
Some ceramic ramekins and dishes are safe for oven and steam applications, but they still need a clear manufacturer rating.
Ceramic can crack if it is not designed for sudden temperature changes, so it should be treated cautiously.
How to Check Whether a Glass Product Is Safe
Before putting any glass into an Instant Pot, review the product documentation carefully.
Do not rely on assumptions based on appearance or brand familiarity.
- Look for explicit wording such as “pressure cooker safe” or “Instant Pot safe”
- Confirm the maximum temperature rating
- Check whether the product is approved for steam or water bath use
- Inspect for chips, scratches, or hairline cracks
- Confirm that the container fits with enough space around it for steam circulation
If the manufacturer does not provide clear guidance, do not use the item for pressure cooking.
Best Practices If You Decide to Use Glass
If you have a manufacturer-approved glass container and still want to use it, minimize risk by handling it carefully.
These precautions reduce the chance of breakage and improve cooking consistency.
- Start with room-temperature glass whenever possible
- Use a trivet to keep the container elevated
- Add enough liquid for safe pressure cooking
- Avoid sudden temperature changes
- Release pressure naturally when the recipe allows it
- Do not overfill the glass container
- Never use damaged or worn glass
These steps do not make all glass safe, but they can reduce common failure points when the product itself is properly rated.
Common Mistakes to Avoid
Many breakage incidents happen because users treat pressure cooking like oven baking or stovetop simmering.
Avoid these mistakes if you are considering glass in an Instant Pot:
- Using ordinary drinking glasses or mason jars without approval
- Moving glass from refrigerator to pressure cooker without warming it first
- Using a quick release with delicate glass containers
- Choosing a glass dish because it is “oven safe” without checking pressure ratings
- Stacking multiple glass items tightly inside the pot
These errors can lead to cracked containers, lost food, and possible injury from hot liquid or sharp fragments.
The Practical Answer for Most Home Cooks
So, can you use glass in Instant Pot?
In most cases, the safest answer is no for direct pressure cooking, unless the specific glass item is clearly manufacturer-approved.
Stainless steel and silicone are usually better choices because they are built for the appliance’s heat and pressure demands.
If you only remember one thing, remember this: glass is acceptable only when the product is specifically rated for that use.
Otherwise, the risk of thermal shock and breakage is high enough that safer materials make far more sense.