Can I test IP67 properly at home or in a warehouse?

You can test the things that matter without a laboratory, but understand what you are and are not doing. A shallow submersion test in a basin tells you whether this particular case leaks under those conditions - which is the question you actually care about at goods receipt. It does not reproduce the full controlled conditions of a formal IP67 test, so it is an acceptance check, not a certification. If you need certification, ask for the laboratory report and check it covers the exact configuration.

What is the fastest check that catches most problems?

Visual inspection before water. Look at the gasket in its groove for twists, gaps and debris; check the mating face is undamaged; close the lid and look along the seam for unevenness; and work every latch through its travel. Most leaks found at goods receipt are visible before a drop of water is used - a twisted gasket or a damaged mating face is the usual cause, and both are obvious once you look.

How do I do a submersion test safely?

Use a container deep enough to cover the case, put the case in empty, close the latches fully, and add weight if it floats - never hold it down by hand for the duration, because you will not be able to detect a slow leak. Leave it for the specified time, then dry the outside thoroughly before opening, and check the interior with a dry cloth or paper. Open away from the water so any ingress is visible rather than washing out.

What should I record?

Date, case model and batch or serial identification, which check was performed, the result, and who did it. Photograph anything that fails before you do anything else. Recording lets you do two things a complaint cannot: spot a pattern across a delivery rather than treating each case as an isolated bad unit, and substantiate a claim with evidence rather than an assertion.

What if a case fails?

Stop and isolate the whole delivery rather than testing on and hoping the rest are fine. A failure rate at incoming inspection is a batch signal, not a single-unit defect. Photograph the failure, keep the failed unit untouched, note the batch identification, and contact the supplier with the evidence. Do not attempt a repair and continue using the case - a repaired seal is not a rated seal.

Incoming Inspection: How to Test a Waterproof Case

A rating is a statement about a sample. Incoming inspection is how you turn it into a statement about the delivery in front of you. The sequence below runs from checks that take seconds to checks that take minutes, so the cheap ones can stop the process before you spend time on the rest.

Sequence: dry checks first

Exterior and structure. Shell damage, cracks, deformed corners, and anything that suggests the case was dropped in transit.
The gasket. Seated evenly in its groove the whole way round, with no twists, no gaps at the corners, and no debris in the groove.
The mating face. The surface the gasket presses against must be clean, undamaged and free of deep scratches.
Latches and hinges. Every latch opens and closes through full travel and engages positively. No play at the pivot, no cracking at the housing.
The seam. With the lid closed, sight along the lid-to-base joint. Unevenness means the lid is not seating - which no amount of water testing will fix.
Any vent. Present, undamaged, and not covered by a label or paint.
Interior. Foam correctly fitted and adhering, no loose debris, and no sharp objects left inside from the manufacturing process.

Most failures are found in the first four checks, before any water is involved. If a case fails a dry check, do not proceed to wet testing - you already know the answer.

Production-line assembly view for inspection reference — Incoming inspection is not visual — it catches process issues before stock.

The dry-paper test

A quick intermediate step between looking and submerging. It catches the marginal case - the one that seals well enough to survive handling but not well enough to be called waterproof.

Lay strips of dry paper towel around the interior perimeter, just inside the seal line, and one across the centre.
Close the lid and latch fully. Leave the case undisturbed for as long as you would leave it in a wet environment.
Open and inspect the paper. Any dampness indicates moisture is crossing the seal under static conditions, which is a worse result than a splash failure because it means the seal is not compressed evenly.

Shallow submersion, done safely

Step	How	Why
Prepare	A container deep enough to cover the case; the case empty and dry inside	You need to be able to detect ingress, so the interior must start dry
Close	All latches fully engaged, on a level surface	Uneven closure mimics a gasket failure and produces a false reject
Weight it	Add weight if the case floats; do not hold it down by hand	Hand pressure varies and masks the slow leak you are looking for
Wait	Leave it for the duration you intend to test - do not lift it out early to peek	Repeated lifting changes the pressure on the seal and invalidates the result
Dry before opening	Thoroughly dry the entire outside, especially the seam	Water on the outside running in when you open is the most common false positive
Open away from water	Open over a dry surface, lid up	Any ingress becomes visible rather than draining away
Inspect	Dry cloth or paper over the interior, paying attention to corners	Water enters at the weakest point, which is almost always a corner or the seal joint

What you are testing is this specific case, in this condition, at this moment. That is the correct question at goods receipt. It is not the same question as whether the design is rated, which is what a laboratory report answers - and both questions are worth asking, at different times.

Sampling: how many to test

For a first delivery from a new supplier, or after any specification change, test more aggressively - a higher proportion than you would for a routine repeat.
For a routine repeat from a supplier with a clean history, a defined sample per delivery is enough, provided you record it.
Always test at least one case from each production batch if batch identification is available; a batch-level problem is invisible in a single-unit check.
Test additional cases whenever anything changes: a new colour, a new foam design, a new hardware supplier, or a new production run after a tooling change.

Recording so it is worth something

Log date, model, batch or serial, which checks were done, the result, and who did it.
Photograph failures before touching anything, including a wide shot showing the case and a close-up showing the defect.
Keep the failed unit in the failed state until the supplier has seen the evidence.
Review the log periodically. A single failure is an incident; two failures of the same type is a trend, and a trend is a conversation worth having before the next order.

Incoming inspection costs minutes per case and converts a claim into a fact. On JUNZHIJIA deliveries, the checks above are the ones we would run ourselves; if you tell us at enquiry which acceptance tests you will perform and at what sampling level, that can be agreed up front so both sides are testing the same thing and reading the result the same way.

How to Test a Waterproof Case on Delivery: An Incoming Inspection Method

Sequence: dry checks first

The dry-paper test

Shallow submersion, done safely

Sampling: how many to test

Recording so it is worth something

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