What’s The Difference Between MIL-C and MIL-PRF?

What’s The Difference Between MIL-C and MIL-PRF?

Knowing military specification (MIL-SPEC) classifications is crucial for anyone working on Department of Defense projects. MIL-SPEC is a United States defense standard that categorizes products meeting specific performance and manufacturing standards for military equipment.

These standards and specifications can be hard to understand, so it is perfectly normal to get confused. A couple of these classifications are known as MIL-C SPEC and MIL-PRF SPEC. Both of these correlate with MIL-SPEC paint, which is today’s topic of discussion. Continue reading to learn the differences between MIL-C and MIL-PRF specifications.

MIL-C Spec

MIL-C spec isn’t just one specification; there are actually a lot of MIL-C specs. Some include five numbers at the end or even up to thousands of numbers. We will not be going through every MIL-C spec in this article, but generally speaking, all of them refer to types of corrosion-resistant and preventative coatings used for the exterior surfaces of military aircraft and equipment.


MIL-PRF specs are similar to MIL-C specs, but these ones have to do with lubricating oil, solvents, hydraulic fluids, and brake fluids. All MIL-PRF specs are specifically made for internal systems such as engines, hydraulic systems, drive trains, power trains, and brakes. This means the powder coatings for these are applied to the interior surfaces. MIL-PRF specs are also used on military aircraft and equipment.

Who Does MIL-Spec Coatings?

Working on a Department of Defense project is no small undertaking, and MIL-SPEC terminology can get complicated at times. At Royal Coatings, our specialists have been trained to use corrosion-resistant coatings that meet these MIL-SPEC requirements.

You can trust us to get military equipment and machinery coated properly in order to meet MIL-C or MIL-PRF specs. Contact Royal Coatings today to learn about our MIL-SPEC powder coating products.