Are tempered glasses dishwasher and freezer safe?

Yes, in most cases. Reviewers consistently report that Bormioli Rocco Rock Bar and Duralex Picardie tolerate thousands of dishwasher cycles, and both brands' product pages confirm freezer and microwave compatibility. Heavy-base Libbey tumblers are also marketed as dishwasher safe, though some retailer reviewers flag scratches over time.