How is the storage life of a War Reserve Case set without guessing?

Answer: Take the task cycle and add half. A seven-year requirement is bought as a ten-year band, since accelerated ageing is an equivalent, not real time.

Does an airtight case still need desiccant?

Answer: Yes. A 3 mbar drop shows the leak is slow, not that the air is dry. Seal at 70% RH with no gel and dew point comes in six months.

What separates four-high from six-high?

Answer: Rib density and safety. Six high puts 225 kg on the base and needs a double lid rib, adding 0.4 kg per case; racking is cheaper.

How often should the seal be replaced?

Answer: Three years for neoprene, eight for silicone, and the inspection decides: below 80% of original thickness, replace.

What happens when the QR label cannot be read?

Answer: Fall back to the stamped lot and the ledger. That is why the stamp sits on a non-load face and the ledger is indexed by lot.

How to Choose a War Reserve Case: Five Tests

Quick answer: Choose a War Reserve Case by running five tests in order: storage life, airtightness, stack height, opening speed, then labels and records. Each constrains the next, so deciding out of order buys a case that seals well and fails in year eight.

Five Tests and the Order to Run Them
Storage Life Sets the Material
Airtightness and Humidity Thresholds
Stack Height and Warehouse Space
Opening Speed, Labels and Records
FAQ

1. Five Tests and the Order to Run Them

Buyers ask the five questions side by side and get a vague answer to each. Order matters more: storage life fixes the material, the material fixes wall thickness, airtightness fixes seals, stack height fixes ribs.

Order	Test	Ask first	Threshold
1	Storage life	Years sealed, opened or not	5, 10 or 15
2	Airtightness	Humidity ceiling	3 mbar, 40% RH
3	Stack	How high, rack height	4 high, 135 kg
4	Opening	Seconds to open	60, seal replaceable
5	Records	Trace every case	Lot, QR, 10 years

Only the first test is outside the buyer's control, because the task cycle sets it. Fix the years before discussing the War Reserve Case price.

2. Storage Life Sets the Material

Storage life is not a round number. Polypropylene at 23 °C indoors holds 90% of its tensile strength after five years. At 40 °C and 93% RH, 28 days of accelerated ageing halves that, retention falling to 70%.

Band	Material route	Control point
5 years	Homopolymer PP, standard antioxidant	Shade only
10 years	Impact copolymer, antioxidant and HALS	Under 60% RH
15 years	Stabilised copolymer, metal parts 480 h salt spray	Constant humidity, 5% sampled every 3 years

Three points follow. Below 3 mm wall, a ten-year War Reserve Case whitens at the corners before it cracks. Every rivet should pass 480 hours of salt spray; at year ten the rivet fails first. A 15-year case needs a closable φ20 port for sampling.

3. Airtightness and Humidity Thresholds

Match airtightness to the desiccant rather than pushing it higher. Charge the War Reserve Case to 20 mbar, wait three minutes, accept no more than a 3 mbar drop; that measures slow leakage, which is what storage suffers from.

Desiccant follows the threshold: 1.2 kg of indicating gel per cubic metre of free volume holds under 40% RH for a year. A 60 L War Reserve Case often has 45 L free once liner and dividers are deducted, so sizing it at 60 L leaves a third of the gel out.

Seals are consumables. Neoprene hardens in three years at 40 °C; silicone lasts eight and costs 40% more. Field resealing needs an open channel, not a groove under the hinge.

4. Stack Height and Warehouse Space

Four high is common. At 45 kg each, the bottom War Reserve Case carries 135 kg, and lid deflection after 90 days must stay within 2 mm. Put that in the acceptance clause.

Space is counted per pallet. A 600 × 400 mm footprint on a 1200 × 1000 mm pallet gives five per layer and twenty at four high, about 1.35 m. A 500 × 400 mm footprint fits six, lifting density 18% but weakening the stack.

5. Opening Speed, Labels and Records

Opening is specified at 60 seconds, because past that people pry. Four latches at 4 N·m open one-handed in gloves, and a break-away seal numbered to the stamped lot shows the War Reserve Case was opened.

Resealing needs the seal and gel replaceable on site: one spare bag, one seal, a hex key. Write date and operator on the label.

Layer	Position	Content	Retention
Stamped lot	Non-load face	Lot, year, tool	Life of case
QR label	Top right of lid	Seal date, openings	10 years
Paper ledger	Store office	Tests, humidity	10 years

The three layers have to agree: stamp is root, QR speeds a check, ledger holds the evidence. The usual failure is a QR label on a load face, rubbed off in two handlings.

Conclusion

Order matters more than numbers: life, airtightness, stack height, then opening and records. Inflate the life band and material is wasted; inflate airtightness and the desiccant is under-sized. Written into an annex in that order, every item can be judged at acceptance, which is what a War Reserve Case is bought for.

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.