What wall thickness is required?

A: Usually four millimetres or more, but ribs decide: a full rib makes four enough, while six without ribs may still dish.

What do administrative requirements cover?

A: Four-face marking, a unique number and a record that maps to it — ignored at purchase, asked first on site.

What sampling rate applies?

A: Five percent for structure and function with batch rejection on failure; administration in full.

Can the numbering rule change later?

A: Better not: it voids history. Two category digits plus four serial digits, fixed once. ---

Explosive Container Standards and Acceptance Points

Q: How is gasket compression measured?

A: Measure the ring, refit and clamp, measure again, and divide the difference by the original — twenty percent or more.

Quick answer: Standards split into three groups: structural (wall, stacking, drop), functional (sealing, venting, earthing) and administrative (marking, numbering, records). The administrative group is the one most often skipped, and the first one asked about in an inspection.

Three groups of requirements
Structure: thickness is only the start
Function: three measurable figures
Administration: the group most often skipped
How to lay out the acceptance sheet
FAQ

1. Three groups of requirements

Structure answers whether it holds: wall and ribs, tier count and base load, integrity after a six-face drop. Function answers whether it keeps: gasket compression, valve cracking pressure, earth resistance. Administration answers whether it can be identified: marking content, numbering, records.

Close-up of the lid gasket and seal witness mark

All three must pass; none substitutes for another. Good structure with a slack gasket still admits moisture, and full function without a number cannot be traced. Three separate sheets find problems faster than one long list, and each sheet can be signed by a different person, which keeps selection and use apart.

Group	Typical requirement	Acceptance
Structure	wall over 4 mm, no dent at two tiers	caliper and stack test
Function	20 percent compression, valve under 30 kPa	paper strip and pressure test
Administration	four faces, unique number, records	sample the log

2. Structure: thickness is only the start

Thickness is the visible part and the least decisive: ribs at the base junction make four millimetres enough, while six millimetres without ribs still dish under two tiers.

Close-up of the earth bonding point on the case

Drop tests cover ten attitudes, with the bottom corner and long edge critical. Once those deform, the sealing face follows and functional results fail with them — structure is the precondition for function, not a separate item.

3. Function: three measurable figures

Sealing is measured as compression, usually twenty percent or more: take the gasket out, measure, refit and clamp, measure again, and divide the difference by the original.

The container under a stack test with two loaded cases above

Venting is the cracking pressure, typically under thirty kilopascals, read from a gauge applied outside. Earthing is resistance, usually under ten ohms. All three leave numbers on the sheet, provided the conditions are recorded: compression reads low in the cold, and cracking pressure reads high if pressure is applied quickly. Differences between batches measured under different conditions are not quality drift, and the sheet should state the temperature and the method used.

4. Administration: the group most often skipped

Administrative requirements barely appear at purchase and are the first thing asked in an inspection: four-face marking, a unique number, and a record that maps to it.

Close-up of the identification plate area, left blank

Fix the numbering rule once: length, meaning, who allocates. Changing it later voids the history. Two category digits plus four serial digits is enough and short enough to write by hand.

5. How to lay out the acceptance sheet

Three columns with measured value and verdict: structure for dimensions and tiers, function for compression, cracking pressure and resistance, administration for faces and uniqueness. Filled in, the sheet is the container's file.

Sample five percent per batch across production dates. Administration can be checked in full because it costs nothing, while structure and function are sampled and a single failure rejects the batch. Keep full checks to ten minutes and sampled checks to numbers that can be reproduced, or the sheet becomes a form nobody fills in.

Conclusion

Three groups: structure by ribs, function by three measurable numbers, administration by marking and numbering. All three together make a pass, and administration is the group buyers skip and inspectors ask about. Split the sheet three ways and it becomes the container's file.

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