How we verify what is on this site
Every supplier says its specifications are accurate. The sentence carries no information, so here is the method instead — where the regulatory text comes from, how the capacity figures are worked out, what happens to a berm before it is packed, and what this process has caught.
Regulations
This site quotes US, UK and German rules directly, because a paraphrase of a regulation is an opinion about a regulation. Four rules govern how we do it.
Primary sources only
Regulatory text is quoted from the official publisher — eCFR and govinfo for US federal rules, legislation.gov.uk for UK and assimilated EU law, gesetze-im-internet.de for German rules. Never from a competitor’s summary, a law-firm blog or a trade article.
The date is part of the quote
Every regulatory quotation on this site carries the date it was read. A rule quoted without a date is a rule you cannot check.
When we cannot reach a source, we say so
The EU’s EUR-Lex blocked our requests, so the REACH text we quote came from the UK’s assimilated version on legislation.gov.uk instead. The wording is materially identical, but it is not the EU original, and our internal record marks that item medium confidence rather than high.
We do not claim approvals that do not exist
No containment product is “EPA certified” — the agency regulates facilities, not equipment. We hold no ISO certification and say so plainly on the About page rather than implying one.
The sizing guide is where most of this lands: secondary containment requirements, quoted and worked through.
Capacity figures
A containment capacity is the number a buyer sizes a compliance decision on. It is also the number most easily overstated without anybody lying.
Inner dimensions, always
Capacity on this site is worked from the inner floor size, never the outside size. Published berm capacities in this market are commonly worked from outside dimensions, which counts the floor the walls themselves stand on. On a 3 × 3 ft berm that is the difference between 22 gallons and about 14.
Computed in code, not copied
Every capacity figure is calculated at build time from the dimensions, in one shared function. None of them is transcribed from a competitor’s table. That is not fastidiousness — it is because we have checked those tables.
Geometric is labelled geometric
Where a figure is the volume of the box rather than the volume the product actually holds, the table says so and leaves the measured column empty until a production sample has been filled with water. A calculated number presented as a measured one is the single easiest way to sell somebody a berm that does not meet their rule.
Worked out size by size on the foam wall spill berm page.
What checking the arithmetic turned up
We recompute published figures before deciding whether to trust them. Four things this found in competing catalogues, described by the arithmetic rather than the brand.
| What was published | What the arithmetic says |
|---|---|
| A 14 × 84 ft berm listed at 8,901 US gal | That is the figure for 14 × 85 ft. The true value is 8,797 gal — a 1.2% overstatement produced by a typo, not a method. |
| A 6 × 6 ft foam wall berm listed at 67 US gal | Every other row in that table equals outside length × width × wall height exactly. This one does not; the same arithmetic gives 89.8. Its published weight is also lower than the 6 × 4 ft unit above it. |
| Two near-identical folded trays, one at 50% of its box volume and one at 99% | Both figures are probably right. What it shows is that there is no industry factor to borrow — how much a folded tray loses is decided entirely by how it is folded, which is why we will not publish a calculated figure for ours. |
| A rigid tray published at 68% of its own geometric volume | A real number for a rotationally moulded shape with draft angles. Not one a fabricated tray is entitled to borrow. |
None of these figures was copied onto this site. The reason for listing them is not that a competitor made a mistake — it is that published capacity figures in this market are worth checking rather than trusting, ours included. The arithmetic is simple enough to run on any table you are comparing: inner length × inner width × wall height × 7.48 gives US gallons.
What happens before it ships
Every unit, not a sample
Each berm is filled with water and left standing for two hours before it is packed. Not one in ten, not one per batch — each one.
Signed, and numbered
The test is signed off by the production manager, and the unit carries a batch number. Both exist so that a question about a berm two years from now has an answer.
Independent testing at our cost
Where your process needs a document rather than our word, we send material from your own order to a third-party laboratory and pay for the test. The report takes about ten days.
What we do not have
No ISO 9001, no ISO 14001, and no application in progress. We would rather be the supplier that told you than the one you found out about.
More on the factory, the equipment and what we can document: about Taizhou Fengxu · documents we can and cannot issue.
Claims this process removed
A method is only worth describing if it costs something. Three claims were drafted for this site and taken out again before it went live.
| “Closed-cell foam” in three specification tables | Written before the factory had confirmed the foam type. It came off the site and went back on only once the factory answered — and the answer turned out to matter, because the best-known competing curb uses open-cell foam for a deliberate reason. |
|---|---|
| “PVC resists chemicals better than bare polyethylene” | Drafted, then dropped. Polyethylene has the broader range against solvents. The product pages now say so, and sell PVC on what it is genuinely better at: fuels, lubricating oils and hydraulic fluids, plus weldability and repair. |
| A single wall-thickness figure taken from a competitor | Our wall is square in section because that is what we build, which makes the inner-size arithmetic exact. Where the number came from someone else’s product it was removed rather than adopted. |
Questions about our method
Why publish this at all?
Because every supplier says their figures are accurate, and that sentence carries no information. Showing the method, the sources and the mistakes it caught is the only version of that claim a buyer can check.
Who checks this content?
The production team at Taizhou Fengxu Textile Industry Co., Ltd.. Regulatory text is checked against the official publisher and carries the date it was read. There is no outside editorial board, and we are not going to invent one.
You found errors in competitors’ data. Which competitors?
We describe the figures and the arithmetic, not the brand names. The point is not that a particular company made a typo — it is that published capacity figures in this market should be checked rather than trusted, including ours. The arithmetic is in the open so you can run it on any table you are comparing.
What does “TBC” mean on your product pages?
It marks a fact the factory has not yet confirmed — a load rating, a measured capacity, a weight. We leave the gap visible instead of filling it with a plausible number. Our build refuses to publish the site for indexing while any of them remain.
How current is this?
Each page carries the date its content was last gone over. The site-wide review date is 2026-09-21. Regulatory quotations carry their own read date, which can be older than the page date and is the one that matters for the quote.
Ask us something specific
Send the inner size or equipment footprint, the liquid, the quantity and the destination. We reply with a quote by email.