Why Do Mugs Craze?

If you’ve ever noticed faint cracks or a web-like pattern on the surface of your favorite mug, you’ve witnessed what’s known as crazing. But why does this happen, and what does it mean for your mugs—especially when we’re talking about promotional mugs designed to showcase your brand?

What Exactly Is Crazing?

Crazing happens when tiny cracks form in the glaze of a ceramic mug. While it might look like your mug is breaking apart, it’s actually a reaction between the ceramic body and the glaze. When these two materials expand and contract at different rates due to temperature changes, stress builds up—and the result is crazing.

Why Mugs Craze

There are a few common reasons why mugs craze:

• Temperature Shock – Pouring hot coffee into a cold mug or putting it in a dishwasher can cause sudden expansion, leading to cracks.

• Manufacturing Stress – Some glazes are more prone to crazing if not matched well with the ceramic base.

• Age and Use – Over time, repeated heating, cooling, and washing wear down the surface of the mug, making it more vulnerable.

Does Crazing Affect Safety?

For casual use, crazing is usually harmless. However, it can sometimes trap stains or even bacteria in the cracks if not cleaned thoroughly. That’s why high-quality promotional mugs are made with durable glazes and finishes that resist wear, keeping them both safe and long-lasting.

Why Quality Matters for Promotional Mugs

When you’re using mugs as giveaways, souvenirs, or merchandise for your brand, the last thing you want is a product that looks worn out after a few uses. Choosing well-made promotional mugs ensures that your logo and design stay vibrant and your brand continues to look professional. After all, every sip from a sturdy mug is a reminder of your business.

CraftClothing’s Take on Durable Drinkware

At CraftClothing, we know that your brand deserves nothing less than uncompromising craftsmanship. Our promotional mugs are crafted to withstand daily use, frequent washes, and even the test of time—so your customers and employees will enjoy them for years without worrying about fading prints or crazing glazes.

✨ Whether for corporate giveaways, event souvenirs, or everyday office use, investing in high-quality mugs is investing in your brand’s reputation.