Borosilicate Glass Mug: Clean & Maintain It Right
By PUEBCO ONLINE STORE | Published: 2026-10-23
Category: Tips & Care
Learn how to clean and maintain a borosilicate glass mug without damaging it. Follow these simple steps to keep your double-wall cup clear and safe.
Quick answer
Hand-wash your borosilicate glass mug with mild soap and a soft sponge, avoid sudden temperature changes, and never use it in the dishwasher or oven. For the double-wall cup, be extra gentle to protect the insulated air layer.
Why care matters for borosilicate glass
Borosilicate glass resists heat better than ordinary glass, but it is not unbreakable. The DOUBLE WALL CUP / Large from PUEBCO, for example, uses heat-resistant borosilicate glass with a 120°C thermal shock resistance. That means it can handle boiling water, but a sudden cold shock—like dropping ice into a hot cup—can crack the inner wall.
The double-wall design traps air between two thin glass layers for insulation. This makes the mug delicate: the inner layer is especially vulnerable if you add ice too quickly. Proper care keeps both layers clear and functional for years.
What to avoid with double-wall mugs
The DOUBLE WALL CUP / Large is not tempered glass, so it cannot handle abrasive impacts or rapid temperature swings. The bottom may have small glass particles from manufacturing—these are harmless and do not affect quality.
Never use the mug in the dishwasher or a drying machine. The high heat and detergents can damage the glass and weaken the seal between layers. The microwave is safe, but always check that the mug is cool before microwaving.
How to clean your borosilicate glass mug step by step
- Rinse immediately after use: Pour out leftover liquid and rinse the mug with lukewarm water. This prevents stains and residue from sticking to the glass surface. Letting coffee or tea dry inside makes cleaning harder and can leave permanent marks.
- Hand-wash with mild soap: Use a few drops of gentle dish soap and a soft sponge or cloth. Wash gently, especially around the rim and the inside bottom where the air gap meets the glass. Abrasive scrubbers can scratch the glass and weaken the double-wall structure. Stick to non-scratch pads.
- Rinse thoroughly and air-dry upside down: Rinse all soap off with cool water—residue can cause cloudiness. Turn the mug upside down on a clean towel to drain and air-dry. Do not use a cloth to dry the inside if you cannot reach the bottom easily. Trapped moisture inside the double-wall gap indicates a leak. If you see fogging, stop using the mug—it means the air layer has been compromised.
Product facts
- DOUBLE WALL CUP / Large: Made from heat-resistant borosilicate glass with a 120°C thermal shock difference. Not tempered glass. The mug survives boiling liquids but can crack if you pour iced water right after hot tea—always let it cool first.
DOUBLE WALL CUP / Large
