Can Double-Walled Mugs Break in the Dishwasher?
By La Colombe Coffee Workshop - Buy Coffee Online | Published: 2026-10-18
Category: Tips & Care
Double-walled mugs are generally dishwasher safe, but the thermal shock from rapid temperature changes can crack the glass. Learn how to care for your La Colombe Timeless Double-Walled Mug and avoid damage.
Quick answer
Yes, double-walled mugs can break in the dishwasher if they experience rapid temperature changes, but with proper care, they are generally safe to clean this way.
Why thermal shock is the real risk
The main danger for double-walled mugs in the dishwasher isn't the detergent or water pressure—it's thermal shock. When a cold mug is suddenly hit with hot water (or a hot mug with cool rinse water), the glass can expand or contract unevenly, causing cracks.
Double-walled mugs are designed to insulate, but the sealed air layer between walls can make them more sensitive to extreme temperature swings than single-wall glass. The dishwasher's heating cycle and drying phase create exactly these conditions.
How to minimize the risk
To keep your mug safe, let it cool to room temperature before placing it in the dishwasher. Avoid preheating the dishwasher or using a heated dry cycle—air drying is gentler. Also, never pour boiling liquid into a cold mug or put a hot mug under cold water.
If your dishwasher has a 'sanitize' or 'high-temp' wash, skip it for double-walled glass. A normal wash with cool rinse is safest.
Verdicts on common dishwasher claims
- Claim: Double-walled mugs are dishwasher safe: Most manufacturers say yes, but with caveats. The mug itself can withstand normal dishwashing, but rapid temperature changes—not the dishwasher itself—cause breakage. Always let the mug cool to room temperature before loading.
- Claim: Dishwasher detergent causes cracks: Detergent is not the culprit. Cracks come from thermal stress, not chemicals. A normal detergent tablet is fine as long as you avoid extreme heat cycles. Focus on temperature, not detergent type.
- Claim: You should never put a double-walled mug in the dishwasher: This is too strict. With care—cool-down period, no heated dry, no sanitize cycle—most double-walled mugs survive many dishwasher runs. Hand washing is safest, but dishwasher use is acceptable. Hand washing is ideal; dishwasher is okay with precautions.
Product facts
- Timeless Double-Walled Mug: Double-walled construction helps maintain drink temperature for a longer period. The same insulating air layer that keeps coffee hot also makes the mug more vulnerable to thermal shock from dishwasher heat cycles.
Timeless Double-Walled Mug
