How long can a portable protective case marked IP67 stay underwater?

Answer: Thirty minutes at one metre, which is short immersion, not diving. Beyond that the gasket cannot keep up and water creeps through the lid seam.

What drop height is a pass for a plastic case?

Answer: Loaded under 15 kg, three corner drops from 1.2 m without latch release and with parts moving under 2 mm; above 20 kg most programs drop to 0.9 m.

How often should the gasket be replaced?

Answer: Three to five years at normal cycling rates; judge by compression set, not by the calendar, and replace once rebound falls under 80 percent.

How much foam interference is right?

Answer: Three millimetres against the softest face, 1.5 mm against a rigid shell, so the part neither shifts in a drop nor gets gripped in handling.

Does a small custom order need a new mould?

Answer: Colour, printing and foam pockets run on the existing tool, with minimums near 200 to 500 pieces; a new outline needs a mould at 25 to 35 days.

Portable Protective Case Selection: Drop, Seal, Salt Spray

Quick answer: Fix drop height and ingress rating first, then check gasket compression, latch holding force and salt spray hours. Once those five match a portable protective case to the site, size and colour are the easy part.

Portable Protective Case Ratings and Their Three Layers
Drop Height and Impact Energy
Gasket Compression and Latch Spacing
Salt Spray and Metal Hardware
Five Checkpoints and the Sampling Sequence
FAQ

1. Portable Protective Case Ratings and Their Three Layers

An IP number answers only two questions: dust and water. A portable protective case also meets impact from a drop and corrosion from salt air, and a shortfall in either layer voids the printed rating.

Shell thickness and corner radius decide how impact energy reaches the cavity; a compressed gasket closes the gap; a rusted hinge pin or valve membrane leaves a case that will not seal.

Rating	Water test	Typical site	Usual failure
IP54	splashes any direction	indoor aisles	latch not seated
IP65	6.3 mm jet, 3 minutes	open yard	gasket under-compressed
IP67	1 m immersion, 30 minutes	flooded track	valve membrane aged
IP68	1.5 m for 60 minutes	immersion duty	leak test every unit

Indoor aisles under 200 m rarely need more than IP54; every step up adds gasket thickness and latch force.

2. Drop Height and Impact Energy

Three variables decide a drop: the mass in the cavity, which face lands first, and whether the floor is concrete or steel. The same case at 8 kg and at 15 kg behaves differently from 1.2 m onto a corner.

Portable protective case: blue lid over black body, blue divider splitting two bays, white foam block and coiled cable left, grey cloth right

A corner drop is harsher than a face drop: energy concentrates on one edge point and peak acceleration runs sixty percent above a face drop at the same height.

Attitude	Height	What it tests	Pass mark
Corner	1.2 m	corner radius, foam fit	parts shift under 2 mm
Edge	1.2 m	rib continuity	no whitening cracks
Face	1.5 m	rebound, foam bond	foam stays seated
Cold corner	minus 20 C	embrittlement	no through-crack

Foam carries the other half. For a portable protective case, specify 30 kg per cubic metre EPE or 38 kg per cubic metre PU, cut 3 mm tight, or the load shifts on impact.

3. Gasket Compression and Latch Spacing

On a portable protective case, sealing depends on compression, not thickness. A silicone gasket with a 6 mm section closing to 4 mm sits near 33 percent compression. Below half it takes a permanent set; too light and the leak test fails.

Latch spacing sets the pressure map. A 600 mm case with two latches lifts about 0.8 mm at mid-span, and water enters there; a 0.05 mm feeler gauge run around the rim finds the gap.

A pressure valve is not optional. Cross a temperature band and internal pressure falls, the gasket is pulled out of shape, and the next opening becomes a fight. A valve cracking at 0.3 bar equalises without letting water in.

4. Salt Spray and Metal Hardware

Salt spray follows the neutral test: 5 percent sodium chloride at 35 C. Forty-eight hours covers humid inland stores, ninety-six hours coastal storage and long voyages; afterwards, cycle the latches 50 times by hand.

Portable protective case: pale blue rim and white shell corner, grey foam with two curved cut-outs, a thin blue sealing edge along the frame

On a portable protective case, hardware alloy matters more than coating. A 304 stainless hinge pin at 4 mm, a nickel-plated 301 spring and a fluoro-rubber membrane outlast zinc-plated carbon steel, which shows white rust within 24 hours of fog.

5. Five Checkpoints and the Sampling Sequence

For a portable protective case, reduce the argument to five boxes you can tick: drop height of 1.2 m at the corner, IP65 with a stated depth, gasket compression of 30 to 40 percent, hardware at 96 hours of fog, and 180 N of latch holding force. Test in that order: load and drop first, packaging last. Reversed, the fix lands in the tool and the schedule slips a month.

Conclusion

Fix the drop, seal and salt spray data before arguing about size and finish. A feeler gauge and a push-pull gauge at acceptance beat ten glossy brochures. Work the five checkpoints in order, and portable protective case selection becomes arithmetic you can audit.

This article discusses only the container (case body) side of specifications and design intent, and does not cover any handling, loading or use of the contents.