What is the minimum for a first aid kit case acceptance?

Answer: Six: thickness, handle load, tightness, drop, cycling, marking. Under time pressure, move cycling to the first batch.

How do you pull minus 20 kPa on site?

Answer: A hand pump with a vacuum gauge. Draw, close the valve, read after 60 seconds; above 0.5 kPa the leak is usually at a rim corner.

Is 3.2 mm a hard figure?

Answer: A floor. The base often runs 0.2 mm thinner than the walls, so measure both.

Why salt spray the latch springs?

Answer: They and the rivets are the only metal on a first aid kit case, and by the time rust shows, the batch is untraceable.

Can a failed batch be sorted and partly accepted?

Answer: Not for critical items, which go back for screening. Major items allow a doubled sample; minor ones may be conceded with a discount.

How long should acceptance records be kept?

Answer: Until that batch retires; the readings and photos are what explain the verdict later.

Which tests clear a First Aid Kit Case in ten minutes?

Quick answer: A first aid kit case is cleared by six tests anyone can repeat on site: wall thickness, handle load, air tightness, drop, temperature cycling and marking. This article gives the procedure and the fail line for each, plus three ways to route a failure.

Six check items for a first aid kit case
Four tests you can run on site
Which clause backs each verdict
Three ways to handle a failure
Sampling and records
FAQ

1. Six check items for a first aid kit case

Acceptance sheets drift into one line: appearance good, function normal. In a dispute that line is worthless, since neither side holds an action the other can repeat.

Six items replace it, each with a procedure, a fail line and a reading.

Item	How	Fail line
Wall thickness	gauge, base and four walls	any point below 3.2 mm
Handle load	30 kg, 10 minutes	set above 2 mm, whitening at the root
Air tightness	minus 20 kPa, held 60 seconds	drop above 0.5 kPa
Drop	1.0 kg ball, 1 m, three points	crack, or a latch that springs open
Thermal cycling	4 hours at minus 20, then 4 at plus 60	distortion, edge misalignment
Marking	three faces, 15 mm characters	readable at 3 m

2. Four tests you can run on site

None of the four needs a laboratory, only a room with a socket and one gauge.

First Aid Kit Case: pale grey rotomoulded shell in a workshop, a spring latch half open at the right rim, front catch hanging, scuffed

The drop test hunts the thinnest point on the lid: a 1.0 kg ball falls 1 m onto the centre, between the ribs and onto a corner. The pass line is not survival but whether the latches still close; one that springs means a soft lid and the batch goes back.

Tightness runs off a hand pump. Draw to minus 20 kPa, close the valve, and a drop above 0.5 kPa in 60 seconds is a leak. The leak rarely sits in the gasket but at the rim corner, where the parting line can step 0.1 mm.

Handle load gets skipped because it looks unable to fail. Hang 30 kg of sand on an empty case for 10 minutes, then measure set at the handle centre; above 2 mm means thin ribs in the boss.

Thermal cycling needs a chamber, which most suppliers own. One round: 4 hours at minus 20, then 4 at plus 60, then room temperature to check edge alignment.

3. Which clause backs each verdict

Five clauses sit behind this factory's sheet:

Technical annex: material, minimum thickness, latch type
Drop method for transport packages: height and repetitions
Water spray method: 30 minutes for units used outdoors
Salt spray: 48 hours neutral, grade 9 or better
Sealed sample: colour, texture, print position

The sealed sample carries the most weight: pale grey covers three greys, but a sealed unit does not, and under one lamp the argument ends.

Salt spray gets dropped most often: the shell is plastic and looks rust-proof. Springs, rivets and the handle pin are not: red rust after 48 hours fails the batch, and it only surfaces six months after assembly.

4. Three ways to handle a failure

A failure is not one verdict but three, routed differently.

First Aid Kit Case: black hard case half open in a white studio, lid upright, base holding rolls of white and blue fabric, ribs inside

Type	Typical item	Action	Batch usable
Critical	thin wall, tightness	reject, screen all	no
Major	handle set, latch springs	double sample, mark each	unit by unit
Minor	marking off position, flow marks	accept with a price reduction	yes

Critical items leave no room for concession: they map to failure in use, not appearance. Major items allow a doubled sample, since the cause may be local, such as one run with short packing at the boss. A minor concession needs the discount and the responsible party on the sheet, or the rework has no owner. Draw those borders in the contract; left vague, every acceptance becomes a negotiation.

5. Sampling and records

Sample size follows batch size, not mood.

Batch	Sample	Accept	Reject
under 50	5	0	1
51 to 200	8	0	1
201 to 500	13	1	2
above 500	20	1	2

The logic: the larger the batch, the higher the risk of one bad unit, so the sample grows while the acceptance number stays at one. Under 200 units, a single failure sends the batch back.

Keep three records: gauge readings at five points with locations, the vacuum value at start and after 60 seconds, and a photo after the drop. They fit on one page and still explain, later, why the batch passed.

Conclusion

Acceptance of a first aid kit case means six checks written as repeatable actions, and three kinds of failure routed along three paths. With criteria in the contract, procedures on the sheet and readings in the file, a first aid kit case verdict becomes a record, not a promise.

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.