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Technical Design Considerations
Design for Cushioning
EPS effectively absorbs shock forces and resists irreversible deformation when compressed to roughly 50-60% of its original thickness. Oversizing the thickness of cushioning material is as ineffective as undersizing - excessively thick cushioning will not properly "give" during impact and can transmit abrupt shock and excessive impact deceleration (G's) to the falling item. On the other hand, insufficient cushion thickness may completely compress or bottom-out during impact, also resulting in high shock force.
For your guidance in cushioning design when allowable shock or G-values are unknown, refer to typical maximum G-Factors in the table below for packaged items of various sensitivities.
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| GFactor |
Examples |
| 15-24 |
Missile guidance systems, precision aligned test equipment, gyros, inertial guidance platforms. |
| 25-39 |
Mechanically shock-mounted instruments (shock mounts secured prior to packaging provided for in-service use only), vacuum tube electronics equipment, altimeters, radar antennas. |
| 40-59 |
Aircraft accessories, electric typewriters, most solid-state electronics equipment, optical equipment, oscilloscopes, computer components, cash registers, calculators. |
| 60-84 |
TV receivers, aircraft accessories, some solid-state electronics equipment, optical equipment. |
| 85-110 |
Refrigerators, appliances, electromechanical equipment, glassware. |
| 110+ |
Machinery, aircraft structural parts such as landing gear, control surfaces, hydraulic equipment. |
For the specific design of your package, please contact your nearest CushPack protective packaging location.
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