Why Our Technical Grade Mostly Passes the Air Test
Reading this because you are specifying, buying or selling containers? Send the details and a grader answers in writing, usually the same business day.
Technical grade is untested, not failed. Offered as a $12 add-on, most technical units pass a 3 psi air hold — which is an uncomfortable thing for us to publish and a genuinely good deal for a buyer who wants certainty without the cosmetic premium.
A customer asked last autumn whether they could pay to have technical-grade units air tested before despatch. We said yes, twelve dollars each, and that if a unit passed we would relabel it.
Then they ordered twenty-four, and twenty-one passed.
That is not a comfortable number to publish and it is the honest one, so here it is along with what it actually means.
What technical grade is and is not
Technical grade means the unit is sound and leak-free on visual and hand inspection — the boss face checked, the valve seated and tested with water, the bottle and cage inspected — but it has not been through the test rig, and it is cosmetically used.
It does not mean failed. A unit that fails an air test does not become technical grade; it goes to rebottling, fabrication or scrap. Technical grade is untested, which is a different thing, and the distinction gets lost because both read as 'the cheap ones'.
Why units land in technical grade
| Reason | Relates to leak risk? |
|---|---|
| Illegible or missing data plate | No — a provenance issue entirely |
| Heavy dye staining or opacity | No — cosmetic |
| Faded or scuffed cage coating | No — cosmetic until it becomes corrosion |
| Minor pallet wear | Marginal — a base swap would promote it |
| Uneconomic to run the full reconditioning path | No — a commercial decision |
| Light crazing visible at a lower corner | Yes — and these we would not air test |
Look at that column. Five of the six most common reasons for a technical grade have nothing to do with whether the bottle holds pressure. The biggest single reason is a strip of metal somebody painted over four years ago.
So of course most of them pass. We put them in the cheap tier because we cannot certify their history or because they are ugly, not because we doubt them.
The exception that matters
The last row. Units with visible crazing at a lower corner go into technical grade with the crazing disclosed, and those we will not air test for a customer — not because they would fail, but because they probably would not.
A crazed bottle passes an air test routinely. The cracks have not gone through the wall yet. The test tells you the unit does not leak today; the crazing tells you it will in eight months under load. Passing an air test on a crazed bottle would give a customer a false certificate, so we decline and say why.
This is the whole reason we grade by hand rather than just running everything over the rig. The rig is a snapshot. The corners are a forecast.
The honest failure numbers
| Grade | First-year weep or leak |
|---|---|
| Rebottled | well under 1% |
| Grade A industrial | well under 1% |
| Food grade | well under 1% |
| Technical, air tested as an add-on | roughly 1% |
| Technical, untested | 2 – 4% |
| Technical with disclosed crazing | materially higher — buy it for low-stress use only |
So the $12 add-on takes you from a 2-to-4% chance of a slow drip to about 1%. On a twenty-unit order that is $240 to avoid, on average, half a failed tote.
Whether that is worth it
Entirely depends on what a failure costs you.
For dust suppression, ballast, wash water or a planter: not worth it. A slow weep in a dust-control tank is an inconvenience. Buy untested technical, buy a spare with the money, and get on with it.
For liquid fertiliser, a chemical you cannot afford to lose, anything on a mezzanine, or anything where a leak is a reportable release: worth it immediately, and arguably you should be buying Grade A rather than technical plus a test, because Grade A also gets you a square cage and a documented history.
Why not just test everything and abolish the tier?
We have discussed it. Three reasons we have not.
- Rig time is the constraint. Testing every unit that passes through would roughly triple rig throughput requirements and we would need a second rig and an operator for it — which would go on the price of every tote, including the ones nobody wanted tested.
- It would not change the provenance problem. A tested unit with an illegible plate is still technical grade for every purpose that matters, so the tier would not disappear, it would just get more expensive.
- Some buyers genuinely want the cheapest working container and should be able to buy it. Abolishing the tier removes a legitimate product to protect people from a 3% risk they have correctly priced.
What we would rather you did
Tell us the application and let us tell you whether the test result is worth $12 to you. In roughly two thirds of cases it is not, and we will say so even though the add-on is nearly pure margin.
And if you are buying twenty-plus technical units for something that genuinely matters, ask for the test on all of them and accept that we will relabel most of the pallet. You will have paid $240 for Grade A-equivalent assurance on stock that cost $1,400 less than Grade A would have.
893 words · published 17 February 2026 by Dale Prichard, Senior grader at IBC Tote Market LLC. We correct posts rather than quietly deleting them; if something here is wrong, tell us and we will say what changed.