Glass can be put through either a process called "tempering," which is a thermal or chemical process that makes glass tougher and stronger, or a milder form of tempering known as "heat-strengthening." Kitchenware is usually heat-strengthened, and this makes it twice as resilient as annealed glass. Annealed glass is often called "untreated glass," because there are two other processes that glass can be put through to make it more resilient to drastic temperature changes. It’s a routine process that almost all glass products go through and helps ensure any residual internal stresses are relieved, so that they don't become weak points in the finished piece. Most glass is "annealed" which means that when it is made, it is slowly cooled to even out any stresses within its structure. Below we cover some of the main materials you’ll find in your kitchen or home and how they are treated for that (unofficial) dishwasher safety seal of approval: Manufacturers use different techniques to make their items "dishwasher safe" depending on the materials they're using. How manufacturers make items dishwasher safe There are different techniques that manufacturers use to ensure their products are dishwasher safe, and methods vary depending on the material in question. Often, manufacturers will say an item is "dishwasher safe" if they’ve treated it at some stage of the production process to ensure it can withstand both the prolonged high temperatures and the detergents involved in a dishwasher cycle. Sometimes wording will accompany the symbol, which helps eliminate some of this symbol-deciphering guesswork. The image may also include a temperature to clarify the safest top temperature you can use on the item. If the symbol just shows droplets or lines that cross the entirety of the square box, it’s probably safe to wash the item on either the top or bottom rack. For items that are only "top rack only," the droplets or diagonal lines will only hit the top of the plates or glasses. You’ll also see either water droplets or diagonal lines that are meant to signify water. This is true for both top rack and generally dishwasher safe items. Typically, the dishwasher safe symbol looks like a square box with some plates or glasses (or both) inside it. If you put an item marked "top rack only" in the bottom rack, you may find it has discolored, warped or become damaged by the end of the cycle. The heating element in dishwashers is typically on the bottom of the machine, which means the top rack is comparatively cooler than the bottom. If an item is marked "top rack only," it means it’s only safe to be washed on the top rack of the dishwasher. There are two common types of dishwasher safe icons:
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