Libbey DuraTuff

The Libbey DuraTuff treatment, applied to the upper portion of the glass, rapidly raises and then lowers the temperature of the glass in a controlled process. These DuraTuff glasses are tougher, more durable, and more resistant to breakages caused by thermal or mechanical shock, which means you end up replacing them less often. When Libbey DuraTuff glasses do break, they break in a safer way that doesn't create as many dangerous glass shards.
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