In an IPX7 test on an IP67 waterproof plastic protective case, is depth measured to the base?

Answer: To the lowest point, with the top at least 150 mm under the surface.

Can the 8 hour dust test be cut to 2 hours?

Answer: Not as an acceptance basis. The 2 kg load and 8 hours form one condition set, so cutting time cuts the pressure cycles.

If compression exceeds 35 percent, is the seal not tighter?

Answer: Tighter briefly, leakier later. Over-compressed cord loses rebound within a few hundred closures.

Are three immersion samples per lot enough?

Answer: For a normal lot, yes, if 80 pieces were screened first. Immersion proves capability, not sorting.

Can the pressure valve be deleted?

Answer: Not advisable. Temperature swings and air freight create a pressure difference the gasket would carry alone.

IP67 Waterproof Plastic Protective Case Acceptance Checks

Quick answer: Accepting an IP67 waterproof plastic protective case comes down to four measured items: no dust after IP6X, no water after thirty minutes at one metre, gasket compression of 25 to 35 percent, and a valve that holds vacuum.

Four Inspection Layers Behind the IP67 Rating
Dust Test IP6X: Powder Load and Duration
Immersion IPX7: One Metre and Thirty Minutes
Gasket Compression and Groove Geometry
Valve Leak Testing, AQL Sampling and Retention
FAQ

1. Four Inspection Layers Behind the IP67 Rating

Acceptance of an IP67 waterproof plastic protective case is not one dunk in a tank. Four layers stack in order: appearance, seal geometry, IP6X and IPX7 tests, then hardware.

The first layer is the moulding. Parting-line steps, sink marks, warp and an uneven flange stop here; if a 0.05 mm feeler blade enters the lid joint more than 10 mm, no gasket will rescue it. The fourth layer checks latches, hinges and the valve, where field leaks begin.

Layer	Items	Pass criterion
Appearance	parting line, warp	blade stops at 10 mm
Seal	compression, groove, splice	25 to 35 percent
Performance	IP6X, IPX7	no dust, no water
Hardware	latch, hinge, valve	rebound under 0.5 mm

2. Dust Test IP6X: Powder Load and Duration

Dust testing runs in a talcum chamber at 2 kg of powder per cubic metre, for 8 hours, under negative pressure drawing 40 to 60 chamber volumes of air per hour.

IP67 waterproof plastic protective case: four closed off-white cases on a workshop conveyor, the nearest one lightly scuffed, windows and machine tools behind

The reading is absolute: no dust inside, not a trace. IP5X tolerates a little dust when operation is unaffected; IP6X does not. Powder in the gasket groove means low compression or a shallow profile.

3. Immersion IPX7: One Metre and Thirty Minutes

For an IP67 waterproof plastic protective case, IPX7 means the lowest point 1 m below the surface, the top at least 150 mm under it, and a 30 minute soak. Specimen and water temperature must sit within 5 kelvin, or trapped air contracts and pulls water through seams.

Sign-off on an IP67 waterproof plastic protective case needs three records: a visual log, a weight difference where anything above 5 g triggers a recheck, and indicator paper at the corners. In-house tests slip on details, with the depth right but the temperature unmeasured.

Parameter	Baseline	Deviation	Effect
Depth	1 m lowest point	0.5 m only	optimistic
Duration	30 minutes	early exit	void
Water delta	within 5 kelvin	unmeasured	false ingress
Reading	no ingress	drops only	seeps missed

4. Gasket Compression and Groove Geometry

For an IP67 waterproof plastic protective case, compression is free height minus installed height over free height: 25 to 35 percent for solid cord, up to 40 for hollow. Below 25 the seal never closes; above 35 the cord flattens and rebound fades within a few hundred closures.

IP67 waterproof plastic protective case: two beige cases on a roller conveyor, the front one upright and closed, handle slot centred, others open behind

Grooves must run 0.2 to 0.4 mm wider than the gasket, with depth derived from compression and fill ratio under 0.75. Too wide and the cord rolls, too shallow and compression starves. Splice the joint at a long-side midpoint, never a corner.

5. Valve Leak Testing, AQL Sampling and Retention

Test the pressure valve alone: plug the port, apply minus 20 kPa, hold 60 seconds, accept a decay of 0.5 kPa or less; immersed, it fails above 6 bubbles per minute. Confirm the valve is open before immersion, or the gasket carries the load.

Sampling follows GB/T 2828.1 at level II: critical AQL 0.65, major 1.0, minor 2.5. A 500 piece lot gives code letter J: 80 pieces for appearance and seal, 3 to immersion, 1 to dust. Retain 3 cases per lot for 12 months.

Defect	Symptom	Disposition
Latch rebound	lid lifts	tighten sampling
Splice offset	corner gap	reject gasket run
Hinge seepage	wet pin bore	scrap unit
Flange warp	feeler passes 10 mm	adjust baffles

Conclusion

Accepting an IP67 waterproof plastic protective case rests on four inspection layers and a written sampling rule, not one soak in a tank. Record the feeler limit, compression range, immersion parameters and valve vacuum, then fix AQL values and retention in the contract. A standard only works when the verdict lands on a number someone else can repeat, which is the basis of IP67 waterproof plastic protective case acceptance.

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.