Libbey’s DuraTuff treatment is a super strengthening thermal afterprocess for “pressed” tumblers and stemware. A similar process is used on blown ware products. Those item numbers are designated with an “HT. The Duratuff process is performed only on the upper portion of the glass increasing its resistance to thermal and mechanical shock. It produces some of the most durable glassware in the industry. It’s barware tough.

What is the difference between DuraTuffing and tempering? Libbey’s exclusive processes were developed not only to reduce breakage and chipping, but to also change HOW a glass breaks – an important safety consideration in foodservice operations. Fully tempered glass is unstable. Inappropriately tempered glassware shatters in an explosive manner. It breaks into smaller jagged pieces that can travel long distances potentially contaminating ice bins or salad bars.

The need for product replacement due to breakage and chipping affects your bottom line. Libbey’s toughening processes produce glassware that stands up to more servings which means more profits for you.

You can count on Libbey to deliver a smarter, safer, more durable and profitable glass every time – and that’s a tough combination to beat!


Libbey’s heat treating process quickly raises the temperature of glass from about 20o C to almost the melting point (650o C) then quickly cools the glass in a controlled manner. The result can be seen in this polarized light photo which shows when the internal strength of glass has been increased.

Treating just the upper third of the glass at a lower temperature than tempering puts less stress on the glass and positively affects HOW the glass breaks as well as improving overall durability.

DuraTuffR tumblers includes: Paneled tumblers • Inverness • Winchester • Gibraltar • Gibraltar Twist • Quadra V • Everest • Endeavor