MIL-PRF-23377 is a two-component high-solids epoxy primer coatings used on military and aerospace equipment.
Purpose
- Corrosion Protection: The primary purpose of this specification is to ensure that the primer provides excellent corrosion resistance, protecting metal surfaces from rust and decay, especially in harsh environments.
- Adhesion: It ensures the primer adheres well to the substrate, providing a solid base for subsequent topcoats.
- Chemical and Solvent Resistance: It specifies requirements for resistance to chemicals and solvents that the primer may be exposed to in military and aerospace applications.
Coating Types:
Epoxy Primer: MIL-PRF-23377 covers two-component, high-solids epoxy primer coatings.
Solvent-Borne: The coatings are solvent-borne.
High-Solids: They are formulated as high-solids coatings, meaning they have a lower volatile organic compound (VOC) content.
Key Requirements:
Corrosion Resistance: The primer must demonstrate excellent corrosion resistance.
Chemical and Solvent Resistance: It must resist various chemicals and solvents.
VOC Content: The specification limits the maximum VOC content, usually to 340 grams per liter (2.8 pounds per gallon).
Applications:
Aerospace: Commonly used on aircraft components.
Military Equipment: Applied to various military vehicles and equipment.
Revisions & Types:
TRevisions: The specification has undergone several revisions over time, with each revision denoted by a letter (e.g., MIL-PRF-23377K, MIL-PRF-23377J). The latest revision is K.
Types: The specification defines different types based on pigment characteristics:
Type I: Standard Pigments.
Type II: Low Infrared Reflective Pigments.
Classes:
Classes: The specification defines classes based on the presence and type of corrosion inhibitors:
Class C: Contains strontium chromate corrosion inhibitors.
Class N: Non-chromate.