Why does module come first when choosing an Ordnance Packing Box?

Answer: Module decides whether cavity and pallet line up. Off-module the fill ratio is wrong and later comparisons lose their baseline.

Is a higher protection rating always better?

Answer: No. IP65 covers wagons, IP66 open wash-down; immersion grades pay only where a transfer can drop the box in water.

How much desiccant does an Ordnance Packing Box need for five years?

Answer: Sized by volume, with a card that turns at 40 per cent, a check every 24 months and two spare cords.

How strong must the base be for four tiers?

Answer: It carries 135 kg. A flat ribbed base sags 1.5 mm in thirty days, a 12 mm grid 0.6 mm, and only the grid keeps the fifth tier square.

What opening time counts as acceptable?

Answer: 90 seconds for two people. Past that the checks get shortened, so keep each latch under 120 N.

Ordnance Packing Box: Five Criteria for Choosing One

Quick answer: Choosing an Ordnance Packing Box runs five criteria in order: cavity module, protection rating against transport mode, desiccant load against storage life, base structure against stacking, and opening time. Fail one and the rest do not count.

Size and Module Come First
Protection Rating Follows the Transport Mode
Storage Life Sets the Desiccant Load
Stacking and Storage Decide the Base
Opening and Resealing Time
FAQ

1. Size and Module Come First

Measure the space an item takes inside the cavity, not its outline. An Ordnance Packing Box is laid out on two modules, 600 by 400 mm and 300 by 200 mm, with 5 mm per side for a single unit and 8 mm between groups.

Fill ratio is usable volume over cavity volume: clear 82 per cent or drop a size. Too much air lets the item shift, too little leaves no fingers at pick-out. Four 600 by 400 cases fill a 1200 by 800 pallet with 10 mm spare; at 610 mm outside, three fit.

Load pattern	Cavity	Clearance	Fill
Single unit	600 by 400 mm	5 mm per side	78 to 85 per cent
Two groups	600 by 400 mm	8 mm between	86 to 90 per cent
Small parts	300 by 200 mm	5 mm per side	70 to 76 per cent

2. Protection Rating Follows the Transport Mode

A rating for an Ordnance Packing Box has to match the transport mode. Road brings 3 to 200 Hz vibration and knocks, so the shell needs stiffness; air adds a 0.75 bar cabin cycle, so the seal must resist negative pressure.

Ordnance Packing Box: red corner close up, rounded lid edge, one horizontal rim rib, short vertical wall ribs, a lock lug beside the latch

IP65 stops a 12.5 L/min jet for three minutes, IP66 a 100 kPa jet. Immersion grades pay only where a transfer step can drop the box in water. Never blank the purge valve: pressure then pulls the cord inward and the box has to be pried open.

Mode	Load	Box response	Rating
Road	3 to 200 Hz	thicker base edges	IP65
Air	0.75 bar cycle	purge valve, seal	IP66
Sea	condensation	surface finish, drains	IP66

3. Storage Life Sets the Desiccant Load

Six months and five years are different specifications. Under six months one indicating pack and a 12-month check is enough; past three years desiccant is sized by volume, with a card turning at 40 per cent.

Every opening adds a compression cycle, so at one cord per three openings a five-year life needs two spares. Where opening is unpopular, specify a test port.

Storage life	Desiccant	Check	Spares
Under 6 months	indicating pack	12 months	none
3 to 5 years	plus humidity card	24 months	2
Over 5 years	test port	24 months	3

4. Stacking and Storage Decide the Base

Stack height sets the base of an Ordnance Packing Box. At 45 kg gross and four tiers the bottom box carries 135 kg; a flat ribbed base sags 1.5 mm in thirty days, a 12 mm grid 0.6 mm under the same load. Beams at 900 mm need two cross ribs on any longer box.

Ordnance Packing Box: red case open, bare gasket groove in the lid, dark partitioned insert holding a set of spanners, round valve on the front

Floor stacking is a pressure question: 45 kg on four 12 cm² pads reaches 37 kPa, enough to mark timber. Four tiers at 320 mm plus a 150 mm pallet make 1.43 m; six tiers pass 2 m, which most warehouses forbid under sprinklers.

5. Opening and Resealing Time

Opening time is measurable. Two people should get from releasing the latches to closing up again inside 90 seconds; past three minutes routine checks skip steps, so keep one latch under 120 N and a gloved hand opens it in one pull.

Resealing depends on cord recovery: below 70 per cent the cord must be pressed by hand all round the rim. Put the seal hole outboard of the latch, clear of the body.

Conclusion

Module decides whether it fits, transport mode whether it survives, storage life whether it keeps, stacking whether it holds, opening time whether anyone bothers. A figure over threshold sends you back a step, not forward into more options. Walk the five before talking price, and the Ordnance Packing Box you buy is adequate and usable.

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.