ASTM C353 is a test method for determining the flatwise compressive strength and modulus of honeycomb (also known as sandwich core) materials. The test method investigates how the core materials, methods of fabrication, core geometry, core density, loading process, and the loading process affects the compressive strength of the honeycomb material. Information gained from ASTM C365 is often applied to design processes, materials specs, research and development, and quality assurance.

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