Flatwise Compressive Properties by ASTM C365

The test method is used to determine compressive strength in the direction the core would be placed in a structural construction. Core materials applicable include continuous (foams) and discontinue bonding surfaces (honeycomb) – stabilized or unstabilized.

Test procedure: Install the conditioned specimens (if required) into the loading platens on the Universal Test Machine and initiate at a specified grip separation significant enough to produce failure within 3 to 6 minutes. The standard speed is 0.50 mm/min [0.020 in/min].

Specimen size: Five specimens tested at thickness.

• Continuous bonding surfaces – minimum facing area shall be 625 mm² (1.0 inch²)
• Discontinuous cellular bonding surfaces – 60 cell minimum per test specimen

Data: From flatwise compression results the following calculations can be made:

1. Ultimate Strength
2. Failure type/mode

**Please note that this test description is intentionally generic in nature and aimed at providing a descriptive summary to enhance test understanding. Standards can be obtained from appropriate standard authorities.