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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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Last modified:  01/02/2014