design guide for case and foam selection

DESIGN GUIDE FOR CASE & FOAM SELECTION

For equipment that requires shock protection select the approximate Fragility from the chart below.

Chart 1

Approximate Fragility of Typical Packaged Articles
Extremely fragile	Missile guidance systems, precision aligned test instruments	15 - 25 G's
Very delicate	Mechanically shock mounted instruments and electronic equipment, Disk Drives	25 - 40 G's
Delicate	Aircraft accessories, Computers, Laptops, Flat Panel Monitors, Standard Monitors, Printers, Scanners	40 - 60 G's
Moderately Delicate	Television receivers, aircraft accessories	60 - 85 G's
Moderately Rugged	Major appliances	85 - 115 G's
Rugged	Industrial machinery	115 G's and up

Divide the equipment weight, pounds, by the bearing area (surface that will rest on the foam), square inches. This will establish the foam loading, pounds per square inch (psi)

For Loading 0.1 to 0.3 psi use 2.0 lbs./cubic foot Polyurethane

For Loading 0.3 to 0.6 psi use 4.0 lbs./cubic foot Polyurethane

For Loading 0.5 to 1.0 psi use 4.0 lbs./cubic foot Polyethylene

Enter Chart 2 at the fragility level; proceed horizontally to intersect the curves at the required height of drop move vertically from this point of intersection down to the indicated foam thickness required. Repeat for each axis of drop.

Add to the size of the equipment, twice the thickness of foam. This will establish the optimum case size.

Chart 2

Foam Selector: for more information on different types of foams

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