If polyurethane ester foam with a density of 33 kg / m 3 (2 lb / ft 3 ) is used, a 50 mm (2 in ) thick shim can reduce the force to 50 g or less. fall from a height of 75 cm (30 in ). This thickness should be sufficient for a large number of objects packed in medium or large boxes. However, smaller packs weighing 7 kg (15 lbs.) or less, or those containing extremely fragile objects, will be better protected by means of thicker wedges. Such a choice is especially important if the packages are sent by the parcel post service or the courier network.
The weight ranges in Tables 1 and 2 can also be used for thicker shims, provided they are made from the same polyurethane ester foam [density of 33 kg / m 3 (2 lb / ft 3 ) ]. In the event of a fall from a height of 75 cm (30 in. ), A shim measuring 75 mm (3 in. ) Thick will reduce the impact force to 40 g.or less, while a wedge measuring 100 mm (4 in. ) thick will reduce it to 30 g or less.
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