Should stack height for a waterproof ammunition box follow the warehouse or the standard?

Answer: Whichever is stricter; seven high means testing seven layers.

An indicator card has changed colour. Is the batch rejected?

Answer: Not always. Check compression and torque; several cards in one batch means a bad gasket lot.

Can the pressure valve be dropped for manual venting?

Answer: Not advisable; prying a lid held by vacuum damages the gasket.

How do you tell in-mould from applied labels?

Answer: Look at the edge; applied labels show a 0.1 mm adhesive step.

A screw loosens during vibration. Assembly or design fault?

Answer: Check torque first. If it still loosens at spec, engagement is short.

Waterproof Ammunition Box Acceptance Standards: Inspection Items

Quick answer: Inspect a waterproof ammunition box in three stages: load, seal, test. Check 3.5 mm walls, 400 kg on a five-high stack, 30% gasket compression, and no cracks after a 1.0 m corner drop.

How the Inspection Sequence for a Waterproof Ammunition Box Is Ordered
Body Strength and Stacking Load Criteria
Seals, Desiccant and Pressure Equalisation Checks
Drop, Vibration and Thermal Cycling Tests
Marking, Traceability and Retained Samples
FAQ

1. How the Inspection Sequence for a Waterproof Ammunition Box Is Ordered

What separates a waterproof ammunition box from an ordinary bin is load, not shape. A 600 mm × 400 mm × 300 mm unit weighs 6.2 kg empty and often 25 kg loaded.

Inspection follows that stress path: walls, seal, then destructive tests. Reverse it and immersion on a dropped case cannot separate an existing leak from drop damage.

Stage	Item	Criterion	Sample
Structure	Walls, base, ribs	3.5 mm wall, 5.0 mm base	3 per batch
Load	Five-high stack	400 kg, 24 h, set ≤ 3 mm	1 set per batch
Seal	Gasket, valve	30% compression, 4.0 kPa	3 per batch
Environment	Drop, vibration, cycling, spray	Section 4	Type test
Marking	Batch code, mould, date	12-character code legible	100%

2. Body Strength and Stacking Load Criteria

Thicker walls are not automatically better. Standard units run 3.5 mm on walls and 5.0 mm on the base, corners thickened to 6 mm, vertical ribs every 60 mm. Past 5 mm the weight merely transfers to the case below.

Waterproof ammunition box: a grey plastic case sits closed on a roller conveyor, vertical ribs on its walls, pallet racking stacked with grey totes behind

A five-layer stack puts 400 kg on the bottom unit for 24 hours, with permanent base deflection at or below 3 mm. For a waterproof ammunition box that beats wall thickness, because creep depends on time.

Handles are tested separately: 50 kg on a 25 kg case for 10 minutes, with 2 mm movement at most.

3. Seals, Desiccant and Pressure Equalisation Checks

Waterproofing here means moisture protection. The usual spec is a double-lip EPDM gasket, Shore A 65, in a 6 mm groove at 30% compression; check lip, joint and corners.

A 120 mL desiccant well holding 100 g of molecular sieve must keep humidity at or below 40% RH after 72 hours at 40 °C and 90% RH outside; replace gaskets compressed below 25%.

The pressure valve should crack near 4.0 kPa, pass 0.8 L/min at 10 kPa, and hold 25 kPa outside for 60 seconds. Without it, cooling from 60 °C to -25 °C leaves the lid held by vacuum.

4. Drop, Vibration and Thermal Cycling Tests

Write environmental criteria item by item. Drop a waterproof ammunition box 1.0 m on a corner and an edge with 20 kg of sand inside; sweep 10 to 55 Hz at 0.75 mm for 30 minutes per axis; cycle -25 °C to 60 °C, 3 hours each, six times.

Waterproof ammunition box: close-up of the joint between olive grey lid and base, a pale gasket along the seam, a ribbed latch at right

Drop results are not judged on appearance: check for cracks, confirm the latches work, then repeat the air test. Corner cracks show only under raked light.

After six cycles, rest two hours and measure gasket set, at or below 15%. Vibration exposes loose screws and hinge pins.

Test	Condition	Samples	Pass criteria
Corner drop	1.0 m, corner and edge, 20 kg	3	No cracks, latches work
Sweep vibration	10 to 55 Hz, 0.75 mm, 30 min per axis	2	No loose screws
Thermal cycling	-25 °C to 60 °C, 3 h each, 6 cycles	2	Gasket set ≤ 15%
Neutral salt spray	72 h continuous	3 sets	No red rust
Stack hold	5 layers, 400 kg, 24 h	5	Base set ≤ 3 mm

5. Marking, Traceability and Retained Samples

Leave a 60 mm × 40 mm label area and print a 12-character code: four for year and month, four for mould, four for serial. Use laser or in-mould labelling; inkjet wipes off with solvent.

Labels must survive 50 alcohol wipes and 24 hours between -30 °C and 80 °C without lifting; in-mould labels last as long as the case.

Retain two cases per batch for 24 months; sampling follows GB/T 2828.1 level II at AQL 1.5 major, 4.0 minor.

Conclusion

Fix 3.5 mm walls, 400 kg held 24 hours, 30% gasket compression, a 1.0 m corner drop and 72 hours of salt spray, and both sides know what to reject. Run those items across three batches, and a waterproof ammunition box becomes dependable, not merely compliant.

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.