Timber or plastic for an ammunition packing box?

A: By duration: timber within a year, plastic where storage exceeds a year and humidity swings.

Can corrugated hold ammunition?

A: For one-way delivery, not storage: wet board loses half its strength and stacks above four tiers collapse.

What moisture content should timber have?

A: Below twelve percent; above eighteen it releases vapour continuously and condenses on the inner wall.

Why is plastic unsuitable for one-way delivery?

A: Empty boxes do not fold, return transport costs more, and below five trips recycling cancels the sealing benefit.

Can shell and liner use different materials?

A: Yes, and commonly: timber with a plastic liner, corrugated with a foil bag, with ten millimetres between them. ---

Box, Packing, Ammunition: Timber, Corrugated, Plastic

Quick answer: Two variables decide the material: storage duration and handling count. Short one-way trips favour corrugated, medium repeated handling favours timber, long damp storage favours rotomoulded plastic. A wrong choice does not fail at once — it settles in year three.

Three materials, two variables
Timber: strong, but damp and nails
Corrugated: cheapest, most scene-dependent
Plastic: expensive up front, cheap later
Mixed use: choose shell and liner separately
FAQ

1. Three materials, two variables

Timber, corrugated and plastic rise in cost, but performance is not linear — each excels at one thing. Timber carries and stacks, corrugated cushions cheaply, plastic seals and weathers. Storage duration and handling count decide which matters.

Close-up of the moulded plastic corner beside a nailed timber corner

Beyond a year and five moves, corrugated's cost advantage disappears because each move consumes structure; timber holds but needs moisture treatment; plastic costs most up front and overtakes on total cost from year three.

Material	Unit cost	Sealing	Stacking	Life
Corrugated	lowest	none, bag only	3 to 4 tiers	one or two moves
Timber	medium	poor, liner needed	4 to 6 tiers	three to five years
Rotomoulded	highest	full gasket	4 to 6 tiers	eight to ten years

2. Timber: strong, but damp and nails

Timber carries and stacks best at moderate cost, the traditional choice for medium and long storage. Its problems are moisture content and nail holes: above eighteen percent the wood releases vapour, and repeated handling widens nail holes into water paths.

Close-up of the lid joint beside a taped carton seam

Dry to below twelve percent, line with a barrier film, coat the outside and add metal corner protectors at the nail lines. Done, timber serves three to five years in a dry store.

3. Corrugated: cheapest, most scene-dependent

Corrugated costs a third to a half of timber and cushions well, which suits one-way delivery. Its weakness is moisture and load: wet board loses over half its strength, and stacks above four tiers collapse.

Three containers in the rain, water beading only on the plastic box

Use it for fast turnover — under a month and two moves. Once storage stretches, the saving is eaten by rework and scrap; ask whether the box will sit in the store for more than thirty days.

4. Plastic: expensive up front, cheap later

A rotomoulded box costs two to three times timber but is the only one that seals fully. For ammunition, sealing sets storage life, so its value is not durability but stretching storage from one year to three or more.

A crushed carton beside an intact rotomoulded box

Its weaknesses are empty volume and recycling: it does not fold, return transport costs more, and disposal needs a channel. Below five trips those two cancel the sealing benefit, which is why it does not suit one-way delivery.

5. Mixed use: choose shell and liner separately

The three are not exclusive: timber shell with a plastic liner puts stacking on wood and sealing on plastic; corrugated with a foil bag puts cushioning on board and moisture on foil. The gain is specialisation, the cost an extra assembly step.

Fit matters: ten millimetres between liner and shell for handling and cushioning. A bonded liner deforms with the shell on impact and loses its independent seal — confirm at sampling, since tooling changes later are expensive.

Conclusion

Two sentences: under a year, choose corrugated or timber on cost; beyond a year with unstable humidity, choose plastic on sealing. Mixed shells and liners combine both strengths, provided the fit is fixed at sampling — tooling changes cost more than the material difference.

This article covers container-side specifications and design implications only, not the handling, loading or use of the contents.