What is file powder?

"File powder" isn't a standard term with a single, universally understood meaning. It likely refers to one of the following, depending on the context:

• Dust or debris from filing: This is the most probable meaning. When using a file (a metal tool used for shaping or smoothing materials), fine particles of the material being filed are produced. This dust is often referred to as "file powder." This powder can be composed of various metals (steel, aluminum, etc.), depending on what is being filed. It's important to note that this dust can be hazardous depending on the material; some metal dusts are toxic or carcinogenic.

• A polishing compound sometimes called "file paste": Some polishing compounds are very fine and might be described as a "powder" even though they're usually pastes or creams. These would be used after filing to create a smoother finish.

• A colloquial term with regional variation: It's possible that "file powder" is a regional slang term or a term specific to a particular trade or industry, and its meaning would need further clarification depending on the context in which you heard it.

To understand what "file powder" means in a specific situation, you need more context. Where did you encounter this term? What was the surrounding discussion about? Knowing this will help determine the intended meaning.