Graphite is a natural lubricant.

• A. False
• B. Not a lubricant
• C. True
• D. Only for dry surfaces

Answer: (C)

Graphite lubricates because its carbon layers are arranged in sheets that slide over one another easily. The bonds between those layers are weak, so when graphite is placed between moving metal surfaces, the layers shear and form a thin film that reduces friction and wear. Because graphite is a mineral that occurs naturally, it is considered a natural lubricant. Its role as a dry lubricant is especially valuable in situations where liquid oils can’t work well, such as high temperatures or vacuum conditions. This is why the statement is true: graphite acts as a natural, solid dry lubricant.