Eli5: why are some utensils dishwasher safe and others are not?

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Technically isn’t every utensil supposed to be dishwasher safe? Like what difference does those utensils have?

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21 Answers

Anonymous 0 Comments

Any utensil that is more than one piece uses something to join those pieces together, like a glue or rivets.

They also have seams, such as the wooden handles on a knife, where moisture and caustic detergent gets trapped. That attacks the glue or the metal of the rivets until it separates or corrodes.

Many knives that appear to be a single piece of metal aren’t; the blade may be stainless steel, but often the handle is hollow and again, joined to the blade with some kind of cement.

Anonymous 0 Comments

Any utensil that is more than one piece uses something to join those pieces together, like a glue or rivets.

They also have seams, such as the wooden handles on a knife, where moisture and caustic detergent gets trapped. That attacks the glue or the metal of the rivets until it separates or corrodes.

Many knives that appear to be a single piece of metal aren’t; the blade may be stainless steel, but often the handle is hollow and again, joined to the blade with some kind of cement.

Anonymous 0 Comments

Any utensil that is more than one piece uses something to join those pieces together, like a glue or rivets.

They also have seams, such as the wooden handles on a knife, where moisture and caustic detergent gets trapped. That attacks the glue or the metal of the rivets until it separates or corrodes.

Many knives that appear to be a single piece of metal aren’t; the blade may be stainless steel, but often the handle is hollow and again, joined to the blade with some kind of cement.

Anonymous 0 Comments

Some are made with materials that rust, melt, discolor, corrode or get damaged in other ways when placed in water, exposed to soap or heated for long periods of time.

Anonymous 0 Comments

Some are made with materials that rust, melt, discolor, corrode or get damaged in other ways when placed in water, exposed to soap or heated for long periods of time.

Anonymous 0 Comments

Some are made with materials that rust, melt, discolor, corrode or get damaged in other ways when placed in water, exposed to soap or heated for long periods of time.

Anonymous 0 Comments

Besides the main “safe” points listed below, let’s talk about knives and wood items.

Lots of experienced chefs will say that you should never put good knives in a dishwasher. The jets of hot water will shove utensils around in the trays, causing damage to the carefully sharpened edge. Knife steel will also be more vulnerable to rust in the drying stage.

Knives with wood handles and cutting boards made of multiple pieces of wood will also expand with the hot water and damage any glues used to hold them together. Wooden spoons and the like will expand too, changing their surface quality to be more porous, but if they were made of a single piece of wood they won’t (usually) fall apart.

Anonymous 0 Comments

Besides the main “safe” points listed below, let’s talk about knives and wood items.

Lots of experienced chefs will say that you should never put good knives in a dishwasher. The jets of hot water will shove utensils around in the trays, causing damage to the carefully sharpened edge. Knife steel will also be more vulnerable to rust in the drying stage.

Knives with wood handles and cutting boards made of multiple pieces of wood will also expand with the hot water and damage any glues used to hold them together. Wooden spoons and the like will expand too, changing their surface quality to be more porous, but if they were made of a single piece of wood they won’t (usually) fall apart.

Anonymous 0 Comments

Besides the main “safe” points listed below, let’s talk about knives and wood items.

Lots of experienced chefs will say that you should never put good knives in a dishwasher. The jets of hot water will shove utensils around in the trays, causing damage to the carefully sharpened edge. Knife steel will also be more vulnerable to rust in the drying stage.

Knives with wood handles and cutting boards made of multiple pieces of wood will also expand with the hot water and damage any glues used to hold them together. Wooden spoons and the like will expand too, changing their surface quality to be more porous, but if they were made of a single piece of wood they won’t (usually) fall apart.

Anonymous 0 Comments

It’s mostly the heat. A dishwasher can wash your dishes at temperatures reaching 70° which your hands could never sustain. As it stands, some materials and decorations – also. But if you instead choose to use a more gentle program that does the job at 40-50 degrees, many utensils will survive inside just fine. Attempt at your own risk. I do that only with things I don’t care about that much.