Definition
A very fine, deep-black powder made of nearly pure carbon, produced by the incomplete burning of hydrocarbons such as natural gas or oil. In aviation it is used as a reinforcing filler in rubber products — most notably aircraft tires and some hoses and seals — to increase strength, wear resistance, and resistance to ultraviolet light.
Plain English
A fine black powder made of carbon that is mixed into rubber to make it tougher and longer-lasting. It is the reason aircraft tires are black.
Context Anchor
Seen in aircraft maintenance and materials discussions, especially when describing tire rubber, rubber hoses, seals, or other black rubber parts.
Derivation
The name is literal: 'carbon' (the element) and 'black' (its color). It comes from the simple observation that burning hydrocarbons with too little oxygen produces a black, sooty deposit made almost entirely of carbon.
Why Pilots Care
Aircraft tires depend on carbon black to resist abrasion from repeated landings, extending service life and reducing failure risk.
Intuition Check
Carbon black does not mean any black dirt or exhaust stain made of carbon. Here it means a manufactured fine carbon powder intentionally added to materials, especially rubber.
Example Sentence 1
Carbon black is added to the rubber compound used in aircraft tires to make them more resistant to wear.
Example Sentence 2
Maintenance records note the carbon black content when approving replacement tires for the fleet.