Is an IP67 immersion test enough for a Waterproof medical case?

Answer: No. It proves static sealing only, not latch preload or lid flatness. Add pressure, handle load, wipes.

Are 500 wipe cycles a hard figure?

Answer: Hard. Ward cases are wiped twice a day, so 500 cycles is a year; below that it whitens inside warranty.

Why cap the pressure drop at 1 kPa?

Answer: At 15 kPa over 30 seconds that is 6 ml per minute. Tighter rejects good parts, looser fails immersion later.

Can the case go through an autoclave?

Answer: No. PP and ABS shells distort within 20 minutes at 121 °C.

Does a removable liner weaken the seal?

Answer: Not if the liner stays out of the sealing path; the lid gasket does the sealing.

Waterproof Medical Case Acceptance Standards and Pass Lines

Quick answer: A Waterproof medical case is accepted on four groups: ingress rating, cleaning tolerance, thermal range and load life. Sealing passes at 15 kPa held 30 seconds with a drop under 1 kPa; immersion at 1 metre for 30 minutes with under 1 g of paper gain; the shell survives 500 wipes and a 25 kg handle load.

Why Acceptance Starts With the Use Scenario
Sealing Class and the Pressure Test
Cleanability and Disinfectant Resistance
Thermal Cycling and Cold Hold
Handle Load Latch Life and Traceability
FAQ

1. Why Acceptance Starts With the Use Scenario

No single checklist covers a Waterproof medical case: shoulder carry, a vehicle bracket, ward transfer and an outdoor station push the shell onto different failure points.

Class A is outright failure: a shifted sealing face, a cracked boss, walls under 2.2 mm, any through hole.

Scenario	Weighted item	Pass line
Shoulder carry	handle load, 1 m drop, six faces	25 kg, 10 min, set under 1 mm
Vehicle bracket	2 h vibration, top stacking	fasteners tight at 40 kg
Ward transfer	wipe cycles, cleanable cavity	500 cycles, corners R3+

2. Sealing Class and the Pressure Test

IP67 means 1 metre for 30 minutes; IP68 means nothing unless depth and duration are both written in. On a Waterproof medical case the seal is a gasket in a lid groove at 25 to 35 percent compression.

Waterproof medical case: black shell open on a pallet, lid lined with one foam block, two front latches, stacked cases behind

Pressure testing fixes conditions: plug the vent, charge to 15 kPa, hold 30 seconds, accept a 1 kPa drop, about 6 ml per minute. Over that, check gasket flash, then latch preload, then lid flatness.

Immersion puts weighed paper inside a Waterproof medical case, holds 1 metre for 30 minutes and accepts under 1 g. A thermal differential helps: warm the cavity to 40 °C then 5 °C, and the collapsing gasket shows the leaking side.

3. Cleanability and Disinfectant Resistance

Medical use is harder on surfaces. No crevice may be narrower than 3 mm, radii stay at R3 or above, and the gasket comes out in one piece. Roughness is capped at Ra 1.6 µm, since a coarser moulding pushes residue into micro-pores. Liners take 20 washes at 60 °C within 2 percent.

Disinfectant resistance is unique to a Waterproof medical case. Isopropanol at 70 percent and chlorine at 5,000 mg/L each get 500 wipes; the surface must not lift, craze or shift beyond ΔE 1.0.

Medium	Concentration	Wipes	Pass line
Isopropanol	70%	500	no lift, ΔE ≤1.0
Chlorine	5,000 mg/L	500	no craze, no colour shift
Neutral detergent	1%	200	no residue, no whitening

4. Thermal Cycling and Cold Hold

Thermal cycling mirrors transport: −20 °C to 55 °C, ten cycles of four hours with a 30 minute transfer. Passing means no crack, no permanent gasket set, opening force between 40 and 120 N. Cold embrittles the compound, so the latch boss root cracks first.

Waterproof medical case: light grey shell open on a bench, grey lid gasket, black foam insert, two front latches, spanners beside

Cold hold is the second line. A 45 litre shell with four 500 g packs holds 2 to 8 °C for eight hours at 35 °C ambient, empty weight 4.2 kg. The lid needs a logger pocket no deeper than 12 mm, else the thinned wall moves a drop crack to its edge.

5. Handle Load Latch Life and Traceability

Statically, 25 kg hangs for 10 minutes and the set stays under 1 mm. Dynamically, a loaded case drops once on each of six faces from 1 metre without a latch springing.

Latches are accepted over 5,000 cycles with preload logged every 500, a fall beyond 20 percent read as short life. Hinge pins are stainless, no red rust after 48 hours of salt spray.

Traceability needs a moulded eight-digit lot code: four for year and month, four for press and shift, plus material grade. Fifty ethanol wipes must not remove it; paper labels never count.

Class	Typical items	Sampling	Verdict
A	missing seal, cracked boss, walls under 2.2 mm	full inspection	zero tolerance
B	cavity oversize, uneven gasket set, loose rivets	AQL 1.0	Ac 1 Re 2
C	scratches, flow marks, flash	AQL 2.5	Ac 3 Re 4

Conclusion

A Waterproof medical case standard turns field failure into bench numbers: three defect classes, a pressure drop, a paper gain, a wipe count and a cycle count. Tiering tells the inspector what cannot ship, the numbers end arguments between buyer and moulder, and pressure, gain and residual set are settled before any Waterproof medical case leaves the line.

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.