CORE AND STRUCTURAL COORDINATION / FIELD NOTE 07
Aluminum Honeycomb Face Sheets and Back Sheets
A sandwich can use different skin thicknesses on its visible and concealed sides. Each skin contributes to the assembly, and a supplier's total thickness does not identify either skin.
What to check on your project
Write face alloy and thickness, back alloy and thickness, nominal core depth and total build-up on separate lines. When comparing alternatives, ask whether the material and the thickness are nominal or guaranteed minimum values.
Worked example
A schedule that says 20 mm total with a 1.0 mm face and a 0.7 mm back distinguishes the visible and concealed skins. The balance includes the core and bond layers. Use those values only to illustrate how to write the schedule. The panel designer still needs to choose and verify the actual build-up for the project.