Is it Safe to Pour Boiling Water into a Glass?

Is it Safe to Pour Boiling Water into a Glass?

When it comes to the world of coffee brewing, few things are as satisfying as the ritual of using a French press. Yet, a common query often arises among coffee enthusiasts: Is it safe to pour boiling water into a glass French press? In this blog, we will delve into the remarkable heat resistance of high borosilicate glass – the material that many top-quality French presses are crafted from. Let's dispel doubts and provide clarity on this matter, ensuring you can brew with confidence.


What is High Borosilicate Glass?

High borosilicate glass is a specialized glass material renowned for its exceptional ability to withstand extreme temperature fluctuations. Unlike standard soda-lime glass, high borosilicate glass contains a higher proportion of boron oxide. This composition grants it remarkable thermal stability and resistance to thermal shock, making it an ideal choice for various kitchenware, including French presses.

(Click the picture for more French press details)

The Benefits of High Borosilicate Glass:

The elevated boron oxide content in high borosilicate glass results in several notable advantages. Most importantly, it can comfortably accommodate boiling water without shattering – a critical attribute for any glassware used in coffee preparation. This heat-resistant nature ensures your safety and guarantees a durable and enduring companion for your brewing journey.

Why Choose Heat Resistance of High Borosilicate Glass?

The decision to opt for the heat resistance of high borosilicate glass in your coffee brewing endeavors is a smart one. This glass type is tailored for situations where temperature differentials are bound to occur, such as when boiling water meets coffee grounds. By selecting high borosilicate glass, you're investing in a reliable and steadfast brewing tool that upholds its integrity even under challenging conditions.


Safeguarding Your Experience: Tips for Usage and Care

Ensuring safe usage and prolonging the lifespan of your glassware.


(Click the picture for more French press details)

Preheating - An Essential Step:

To truly harness the heat-resistant properties of high borosilicate glass, it's worth considering the preheating process. Before you embark on your coffee brewing journey, take a moment to preheat your French press. Simply pour hot water into the empty press, allowing it to sit for a minute or two. This preliminary step minimizes the temperature differential when you pour in boiling water, reducing the risk of thermal shock. By preheating, you're essentially priming the glass for the task at hand, ensuring a seamless transition from one temperature extreme to another.

Moderation in Temperature Changes:

While high borosilicate glass is designed to handle significant temperature variations, a measure of caution is never amiss. When you're ready to add boiling water, it's advisable to give your French press a moment to adjust. Placing the glass press on a room-temperature surface for a brief interval can help mitigate the stress caused by sudden temperature changes. This gradual approach not only safeguards the integrity of the glass but also prolongs the lifespan of your French press, allowing you to enjoy countless cups of coffee without worry.

Handle with Care:

The sturdiness of high borosilicate glass doesn't negate the need for gentle handling. While it's true that this glass is less likely to shatter under stress, it's still essential to exercise caution. Avoid subjecting your French press to sudden impacts and extreme temperature shifts. Treat it with the respect it deserves, and it will serve you well for years to come.

Careful Cleaning:

The path to maintaining the longevity of your high borosilicate glass French press is paved with proper cleaning techniques. While it might be tempting to toss it into the dishwasher, the best approach is to hand wash your press. Use a gentle detergent, lukewarm water, and a soft sponge to clean both the interior and exterior of the glass. This mindful cleaning process prevents scratches and ensures that your French press remains free from any residue that might affect the taste of your coffee.

Storing with Sensibility:

Even during periods of non-use, it's wise to store your high borosilicate glass French press with care. Find a secure and stable place to keep it, away from potential hazards or accidental bumps. Additionally, consider disassembling the components of your French press when storing it for extended periods. This precautionary measure ensures that each part remains in pristine condition and is ready for your next brewing adventure.


How to Properly Make French Press Coffee with Borosilicate Glass?

There are a lot of glass French press pots on the market, When choosing a glass French press pot, in addition to choosing a high-quality borosilicate glass material French press pot, we also need to learn the correct way to operate it. To let you understand more directly, we will demonstrate it using a video.


Dispelling Doubts: Debunking Common Misconceptions

Clarifying misconceptions surrounding boiling water and high borosilicate glass.

French Press Coffee Makers

(Click the picture for more French press details)

Myth: Glass Will Shatter Instantly from Boiling Water:

It's a common belief that glass cannot handle extreme temperatures, leading to concerns about shattering. However, the truth is that high borosilicate glass is engineered to endure thermal stress, assuring you that pouring boiling water into your French press won't result in sudden breakage.

Myth: Gradual Warming is Vital:

While gradual temperature changes are beneficial, high borosilicate glass can withstand boiling water without gradual warming. Its unique composition minimizes the risk of sudden fracture due to temperature variations.

Myth: High Borosilicate Glass Is Costly and Rare:

Contrary to misconceptions, high borosilicate glass products, including French presses, are widely accessible and reasonably priced. Reputable brands offer French presses made from this durable material, ensuring you can enjoy the benefits without straining your budget.


Common Q&A

Q: How do you pour boiling water into a French press?

A: Pouring boiling water into a French press is delicate yet straightforward. To ensure a safe and smooth experience, follow these steps:

  1. Preheat the French Press: Begin by preheating the French press with hot water. Pour some hot water into the empty press and let it sit for a minute or two. This preheating step helps the glass adjust to the upcoming temperature change.
  2. Discard Preheating Water: Once the French press is preheated, carefully discard the preheating water. This ensures that the glass is ready to accommodate the boiling water without sudden temperature shocks.
  3. Add Coffee Grounds: Now, add your desired amount of coffee grounds into the preheated French press. The warmth of the glass enhances the brewing process.
  4. Pour Boiling Water: Slowly pour the boiling water into the French press over the coffee grounds. Pouring gently helps avoid splashing and sudden temperature changes.
  5. Stir and Steep: Give the mixture a gentle stir to ensure even saturation of the coffee grounds. Place the lid on the French press with the plunger in the raised position.
  6. Allow to Brew: Let the coffee steep for the recommended time (usually around 4 minutes). This allows the flavors to infuse into the water.
  7. Press the Plunger: After the brewing time, slowly press the plunger down to separate the brewed coffee from the ground. The heat-resistant glass can handle the temperature change as you plunge.
  8. Pour and Enjoy: With the plunger pressed down, your coffee is now ready to be poured and enjoyed. Pour it into your cup and savor the rich aroma and flavors.


Q: Why is there no boiling water in the French press?

A: While it's safe to pour boiling water into a high borosilicate glass French press, it's recommended not to use boiling water directly from the kettle. The reason for this is to minimize the risk of thermal shock – a sudden and extreme change in temperature that can stress the glass and potentially lead to breakage. Preheating the French press with hot water before adding boiling water helps to reduce this temperature differential, ensuring a safer brewing process.


Q: Can you put boiling water in a glass jar?

A: Putting boiling water into a glass jar can be safe depending on the type of glass used. Regular glass, such as soda-lime glass, may not handle the rapid temperature change well and could potentially shatter due to thermal shock. However, if the glass jar is made from high borosilicate glass, like many quality French presses, it is designed to handle boiling water without shattering. High borosilicate glass is specifically engineered for its excellent heat resistance and durability. Always check the manufacturer's specifications and guidelines to ensure the glass jar is suitable for holding boiling water.

Back to blog

Leave a comment

Please note, comments need to be approved before they are published.