Does an IP67 report for a Prop Charge Container replace an immersion test?

Answer: Once, not every batch. The report covers the unit submitted; gasket compression falls with each opening. Pull a sample per delivery.

Is wall thickness linear with tier count?

Answer: No. Thickness adds stiffness, but the load path runs through ribs into the feet.

Does a different round need a new Prop Charge Container mould?

Answer: Check the diameter difference. Within one millimetre per side, swap the liner; beyond that the channel leaves a gap and the round shifts.

Can a two-year-old static report be reused?

Answer: Depends on the additive. Migratory types climb two or three orders of magnitude in two years and void the report; permanent networks still deserve an annual re-test.

Choosing a Prop Charge Container by Clause: Five Measured Tests

Quick answer: A Prop Charge Container is judged in five steps — cavity, seal, stacking, location, static — each with a number read on site: 1.0 to 1.5 mm per side, a 0.05 mm feeler that will not enter the joint, under 3 mm of bulge after five tiers, and surface resistance between 10^6 and 10^9 ohms.

Five Benchmarks Before Any Price Talk
Ingress Ratings: When the Label Outruns the Report
Stacking and Vibration: Methods Given, Layers Not
Cavity and Location: Channels, Clearance, Pull Force
Static Dissipation: Three Readings, One Condition
Sample Arrival: Five Actions, One Page
FAQ

1. Five Benchmarks Before Any Price Talk

A catalogue sheet reports what a mould can do, not whether the box suits your rounds. Until the cavity is fixed, liner thickness means nothing; until the seal is proven, static work only traps moisture. Buyers reverse that order and find out at inspection.

Benchmark	Reference	On-site check	Failure reading
Cavity	ISO 2768, class m	Tape length, width, depth	Under 1 mm per side
Seal	IEC 60529, IPX7	0.05 mm feeler at the joint	Feeler enters anywhere
Stacking	ISO 2234, 24 h static	Five tiers, measure bulge	Bulge over 3 mm
Location	Tooling drawing	Shake the empty case	Rattle, rub marks
Static	ANSI/ESD S541	Five resistance points	Above 10^9 ohms

Only two need the lid open, so a sample Prop Charge Container clears a loading bay.

2. Ingress Ratings: When the Label Outruns the Report

An IP code answers two questions: can solids get in, can water get in. IP6X is dust-tight; IPX7 is one metre of water for thirty minutes. In a storehouse a Prop Charge Container meets condensation and road spray, not a lake.

Prop Charge Container: a black hard case lying flat on a grey ribbed pallet inside a white van, wooden pallets stacked behind

Reports drift from labels: an IPX4 sheet sits behind a box marked IP67.

Pressure is the second blind spot. A climb or a hot afternoon pushes the differential to 20 kPa, enough to lift the lid and release gasket compression. Fit a vent, or vacuum-hold at minus 20 kPa.

3. Stacking and Vibration: Methods Given, Layers Not

ISO 2234 gives the method, not the tier count. A loaded Prop Charge Container weighs 22 kg, so five tiers load the bottom unit with 88 kg; a 1.6 factor makes the design check 141 kg.

Tiers	Load on bottom case	Advised at 40 °C	Check
3	44 kg	3	Side-wall bulge
5	88 kg	4	Bulge and lid offset
7	132 kg	5	Re-measure with a board

Tiers are calculated, not printed: polyethylene loses modulus at 40 °C, so a summer tier drops one.

Method 514 of MIL-STD-810H matters for one reason: ribs above the feet carry load down the wall, offset ribs bend it and let water in.

4. Cavity and Location: Channels, Clearance, Pull Force

The cavity is the only part of a Prop Charge Container cut from a real sample. Moulded channels beat glued foam because the channel wall is the locating face.

Prop Charge Container: an open black case with a row of molded locating channels holding brass cartridges, one latch on the right wall

Allow 1.0 to 1.5 mm per side: tighter and the round scuffs the rim, looser and potholes throw it against the channel.

Depth runs at 0.6 times the diameter, so the mass sits in the pocket. Pull force lands at 30 to 50 N, firm in one hand yet back on the floor by its own weight. Edges to 5 mm, draft 1°.

5. Static Dissipation: Three Readings, One Condition

Three readings, one condition: 23 °C, 50 per cent relative humidity, sixty seconds after twenty-five wipes. Otherwise the numbers cannot be compared: one compound spans three orders of magnitude between a dry store and a damp dock.

Surface resistance belongs between 10^6 and 10^9 ohms; below that the discharge concentrates, above it the surface insulates. Terminal to the farthest liner point stays under 2 ohms. Each reading maps to a replaceable part, so a Prop Charge Container is repaired, not scrapped.

6. Sample Arrival: Five Actions, One Page

Five actions on arrival, one number each:

Weigh the empty case; a 5 per cent deviation asks if the compound changed
Walk a feeler round the joint, number the points that admit it
Stack five tiers, measure bulge after 24 hours
Shake the empty case, load and unload three times
Read surface resistance at five points, keep the highest

Conclusion

Read the benchmarks in order: cavity, seal and pressure, stack calculation, resistance. Two need a sample, the rest a clause and a meter. One page gives every supplier the same baseline for a Prop Charge Container quotation.

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.