Why is a grenade transport container not injection moulded?

Answer: Size and wall map. A body with 8 mm corners needs a press over 1,000 tonnes and a heavy tool; a rotational tool costs about a tenth as much.

Is the twelve-cell grid inside the grenade transport container fixed?

Answer: Dividers seat in moulded slots, so columns can change, but clear width changes too. At six columns each cell falls to about 58 mm, too tight for handling.

Does a pressure vent weaken the seal?

Answer: Not at the right opening pressure. A 0.12 bar vent stays shut on its spring; a 0.05 bar vent cycles on rough roads and becomes the leak path.

Can the wall be thinner?

Answer: Dropping the side wall from 5.0 mm to 4.0 mm saves about 0.6 kg, but corner cracking in a 1.2 m drop rises sharply.

Must every unit be leak tested?

Answer: Preferably. Variation comes from gasket fitting, which only a test reveals. AQL 2.5 suits repeat runs; the first batch deserves a full check.

Grenade Transport Container: Structure and Process in Five Points

Quick answer: A grenade transport container rests on five measurable decisions: shell split and wall map, internal grid, seal and vent, latch fit, moulding and final test. Weakening any one caps the protection of the whole body.

How the Shell Is Split and Thickened
Grid Layout and Divider Fit
Seals, Venting and Latch Fit
Temperature and Time in Rotational Moulding
Four Tests Before Shipment
FAQ

1. How the Shell Is Split and Thickened

A grenade transport container is usually rotationally moulded in one piece, so the split sits only at the lid joint. The parting line runs about 30 mm below the waist, where a divider cannot catch on it.

A 5.0 mm side wall, a 7 mm base and 8 mm corners is the usual spread: the base carries stacking load, the corner takes the first impact in a drop.

Zone	Wall	Why
Side wall	5.0 mm	Resists pressure when stacked
Base	7 mm	Carries unit and layer load
Corner	8 mm	First contact in a drop

Keep the spread within five percent of total weight, or the body hangs crooked when carried. A 380 × 280 × 220 mm cavity weighs 4.2 kg empty, handles sized for 30 kg loaded.

2. Grid Layout and Divider Fit

The cavity of a grenade transport container is a grid, not an open box. A 380 × 280 mm floor split four across and three down gives twelve cells at about 88 mm clear width, with 6 mm PE dividers seated in moulded slots. Impact spreads across twelve small volumes, so load in a cell does not move its neighbour.

Leave 1.5 mm between divider and wall as shrink allowance, not slop. A rotomoulded body keeps shrinking for about 48 hours; without the gap, dividers press on the wall by the third day, the side bulges into a hard spot, and that spot is where a drop starts a crack.

3. Seals, Venting and Latch Fit

Sealing rests on one continuous gasket, 6 mm across the section at 60 Shore, compressed by 25 percent. Below 15 percent it merely sits on the groove; above 35 percent the latches need force and the gasket takes a permanent set.

Part	Specification	Fit
Gasket	6 mm, 60 Shore	25 percent compression, no joint
Vent	Opens at 0.12 bar	Lid face, away from handles
Latch	Four at 350 N each	Matched to lid stiffness

The pressure vent is the part most often deleted. Moving from sea level to 2,000 m creates roughly 0.23 bar, so a body without a vent needs two people to break open. A 0.12 bar vent keeps opening effort under 50 N.

4. Temperature and Time in Rotational Moulding

The window is set by oven temperature, time and biaxial speed. A grenade transport container typically runs 260 °C for 12 minutes and cools for 8, with the major axis at 6 rpm against 8 on the minor.

Stage	Setting	Cost of losing control
Heating	260 °C, 12 minutes	Under-cured corners, or yellowing
Biaxial speed	6 rpm major, 8 minor	Close ratio thins both ends
Demould	Below 60 °C mould	Early release ovalises the rim

Below 210 °C the powder will not flow and unmelted granules sit in the corners; above 280 °C the surface yellows and impact strength falls by more than thirty percent. A 7 mm wall needs 15 minutes, not 12. A full cycle runs about 40 minutes, so one machine turns out roughly 30 bodies a day.

5. Four Tests Before Shipment

Four tests stand between the grenade transport container and the pallet: 30 kPa held for 60 seconds with no more than a 1 kPa drop; a 1.2 m drop onto each of six faces; 48 hours of salt spray; and 2,000 latch cycles with holding force down no more than fifteen percent.

Leak testing is the one most often softened. Drawing a slight vacuum and listening beats watching the gauge: a 0.5 mm misalignment at the gasket joint hisses within 60 seconds. On the drop test, watch the corner strike.

Conclusion

A grenade transport container holds no mystery, only five measurable decisions: a 5.0 mm wall with 8 mm corners, a four-by-three grid, 25 percent gasket compression, a 260 °C window of 12 minutes, a 30 kPa leak line. Simplify one and the body may still pass on the bench, with failure surfacing later under load. Put the five on the drawing, and the grenade transport container process holds to shipment.

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.