Centered on the hollow structure of "outer layer + inner layer," double wall glass differs from traditional single-layer glass. Its advantages focus on heat insulation and temperature retention, and it is often combined with borosilicate glass to enhance performance, making it a practical and user-friendly beverage container.

I. Core Advantages: Experience Upgrade from Hollow Structure

The key value of double wall glass lies in the sealed hollow layer between the two glass layers, which forms a "physical heat insulation barrier":​

· Heat Insulation & Anti-scalding: When boiling water or hot drinks are poured in, the outer glass temperature is only slightly higher than room temperature, so there is no risk of scalding when holding. When holding iced drinks, the outer layer rarely condenses water droplets, preventing slippery hands or wetting the table—solving the pain points of single-layer glass.

· Heat & Cold Retention: The hollow layer reduces heat conduction. Hot drinks can stay warm for 1-2 hours, and cold drinks can stay cold for 2-3 hours. Although not as long-lasting as thermos flasks, it meets daily short-term temperature retention needs, and the transparent material does not affect the observation of the beverage state.​

II. Material Selection: Borosilicate Glass is the Mainstream Choice​

The material of double wall glass directly affects its durability. Currently, the market mainstream is double-layer borosilicate glass rather than ordinary glass:​

· Double wall glass made of ordinary glass can achieve basic heat insulation, but its heat-resistant temperature range is only 50-80℃. It is prone to cracking when subjected to sudden temperature changes. Additionally, the double-layer structure increases the glass's weight, and its impact resistance is weak, making it easy to break due to collisions.​

· Double-layer borosilicate glass combines the advantages of "hollow structure" and "borosilicate material": its heat-resistant temperature range reaches 150-200℃, allowing direct pouring of boiling water and heating in microwaves. It has high mechanical strength, is not easily broken by daily bumps, and has a service life of 3-5 years, balancing heat insulation and durability.​

III. Scenario Adaptation: Double Wall Glass vs. Single-layer Glass​

· Double Wall Glass: Suitable for scenarios where hot/cold drinks are held by hand, such as drinking coffee at the office, making flower tea at home, and entertaining guests—it not only prevents scalding but also maintains the beverage temperature. It is also suitable for users who value appearance, as the hollow structure creates a "floating beverage" visual effect, enhancing the user experience.​

· Single-layer Glass: More suitable for scenarios where frequent hand-holding is unnecessary, such as drinking while placed on the table, holding room-temperature drinks, or meeting needs for light weight (its weight is only 60%-70% of that of double wall glass of the same specification) and low budget.

IV. Usage Notes​

· Avoid Sudden Temperature Changes: Even with double-layer borosilicate glass, it's important not to put it in the refrigerator immediately after handling boiling water, nor should you pour boiling water into it right after taking it out of the refrigerator. Allow the glass time to adjust to temperature changes.

· Care for the Hollow Layer Seal During Cleaning: Choose one-piece models with good sealing to prevent water from entering and causing bacteria growth. When cleaning, use a soft cloth to avoid scratching the inner layer with hard objects.

To summarize, the key advantages of double wall glass are its structural heat insulation and material durability. Opting for borosilicate glass models offers three significant benefits: excellent heat insulation, high heat resistance, and effective temperature retention. This makes them ideal for users who prioritize quality and safety.