Which Product Documents a Buyer Should Ask For
Datasheets, test bases, manuals and packing lists are what keep working after delivery. What to request, and when to request it.
Product documents are not paperwork; they are the part of the purchase that keeps working after the goods arrive. A filter without its test basis cannot be compared, a controller without its manual cannot be handed over, and a purchase without its packing list cannot be checked. The documents a buyer asks for decide how much of the purchase can be verified later.
01 – Why each channel needs it, and where it is used
| Channel | Role in this decision | Why they need it |
|---|---|---|
| Distribution and wholesale | Pass documents to resellers and contractors | A product without a datasheet is harder to sell and harder to support, and the gap surfaces at the first technical question |
| Contractors and integrators | Hand over an installation | Handover packages include manuals, test records and warranty terms; missing documents delay the final payment |
| Direct B2B users – farms, estates, municipal green | Maintain and justify the installation | Maintenance needs part numbers and settings; audits and grants need evidence |
| Specifiers and influencers – designers, procurement consultants | Verify the specification was met | The test basis is what distinguishes a stated class from a claimed one |
It applies to every component, but the documents differ by type: filters need their grade basis and loss data, pumps their curves, controllers their manuals and wiring diagrams, meters their calibration certificates.
02 – How to make a preliminary selection
Start with the decision the document supports. A grade claim needs a test basis; a pressure claim needs a condition; a warranty needs terms. Asking for the document that supports the decision is more useful than asking for „all documents“.
Then check the language and the format. A manual in a language the site cannot read is not a manual; a drawing that cannot be opened on site is not a drawing. The delivery format belongs in the RFQ.
Then confirm which documents travel with the goods and which are sent separately. Customs, certificates and origin papers have their own timelines, and a certificate that arrives after the container delays the clearance.
Finally, decide what is kept and where. A handover file with the datasheets, settings and commissioning readings is what makes the next service visit efficient, and it is the buyer’s own deliverable.
03 – Comparing the realistic options
The table lists the document groups against what each one verifies.
| Document | Verifies |
|---|---|
| Datasheet | Stated performance and dimensions |
| Test basis / certificate | That the class claim was tested, and how |
| Material list | Compatibility and durability assumptions |
| Manual and drawings | Installation, settings and maintenance |
| Packing list | That the shipment matches the order |
| Origin and compliance papers | Clearance and eligibility |
A supplier who can provide all six is describing a controlled process. One who can provide the first is describing a catalogue.
04 – What goes wrong, and what still needs confirming
The common failures are documents that arrive after the goods, test bases that are claimed but not supplied, manuals in the wrong language, and packing lists that do not match the shipment. Each causes a delay that is usually attributed to the supplier but is decided at the RFQ stage.
Items to confirm in writing: the document list; the language and format; which documents travel with the goods; the certificate basis and its date; the revision control (so a later datasheet does not silently change the specification); and the cost, if any, of additional copies or legalisation.
05 – What we can supply and what to send
Delta AgriFlow supplies documentation with the products we quote – filters, pumps, dripline, controllers, meters – and we tell you which items are confirmed in writing and which still need checking with the factory.
Send six items: the decisions the documents must support; the language and format needed; whether certificates are required for clearance; the handover package required; the revision control you expect; and the deadline for each document.
The most useful document question is not ‚do you have a datasheet‘ but ‚what condition is that number measured at‘. A pressure loss figure without a flow is not a specification, and the answer separates a supplier who understands the product from one who forwards a PDF.
A second is revision control. Datasheets change; a specification written against revision A and delivered against revision C is a quiet substitution, and the date on the document is the only way to see it.
A third is the manual. Ask for the manual before the order, in the language the site uses, and read the maintenance section. It tells you what the supplier thinks the product needs, which is often more honest than the sales material.
A fourth is the packing list. It is the cheapest control on the shipment and the first document anyone checks at the gate; a supplier who cannot produce one has no packing process.
A fifth is the certificate of origin and any compliance paper. These are timeline items rather than quality items, and a late one holds a container at customs while the site waits.
A sixth is the test basis for a filtration class. ISO 18471 defines verification of filtration grade, and a claim that references a method can be checked; one that references a number cannot.
Finally, decide where the documents live. A single handover file, kept with the installation and updated when parts change, is worth more than a folder of PDFs scattered across email threads.
What to record at handover
A handover that consists of a working system and a verbal explanation is not a handover. Three things have to be written down: what was installed and where, what the settings are, and what the routine is. Record the document list, the revision dates and where the handover file is kept.
The commissioning check matters as much as the record. Check the packing list against the shipment and the certificate dates against the clearance timeline. A reading taken once at commissioning is worth more than a datasheet, because it describes the installation rather than the product.
Finally, hand over the commercial part as clearly as the technical part. Hand over the manual in the site’s language and the test basis for every stated class, so later questions have an answer. Without it, the next order restarts from zero, and the advantage of a standard package disappears.
Documents to request with an order
- Datasheet with test conditions
- Test basis or certificate for stated class
- Material and compatibility list
- Manual and drawings in site language
- Packing list
- Origin and compliance papers
A final commercial point: documents are a negotiating position. A supplier who can produce a test basis and a revision-controlled datasheet has done work that a cheaper competitor has not, and that difference is worth paying for on any installation where the specification matters.
Where a client asks for a brand rather than a specification, the documents are how the brand is justified to the next reviewer. They are also how a substitute is refused without an argument.
06 – Questions, sources and next steps
Are documents really necessary for small orders? Yes, because they are what allow the next order to be identical. A small order without documents becomes a guess when it is repeated.
What if the supplier only has a catalogue page? Then ask for the test basis of the claims on it. If there is none, the claim is marketing rather than specification.
Who keeps the documents? The buyer, as part of the installation file. The supplier’s copy is not a substitute when a service visit happens three years later.
One document that buyers forget is the warranty statement. It is short, it is cheap to send, and it is the document that determines what happens in year three when a component fails.
One last habit: file the documents by installation, not by supplier. When the site asks a question in three years, the installation is what they will remember.
Documents are cheap to ask for and expensive to reconstruct. The best time to request them is before the order, and the second-best time is before the payment.
Before you order
- Datasheet with conditions
- Test basis for class claims
- Material and compatibility list
- Manual in site language
- Packing list
- Origin and compliance papers
Information boundary
This article describes how the decision is structured. It is not a performance specification and does not state capacity, flow, pressure or service-life values for a specific product. Those values are confirmed per project after a written quotation; manufacturer figures cited are the published values for those products, not project commitments.
Reviewed: 2026-10-26. Next review after supplier specifications are confirmed in writing.
Sources and further reading
- Rain Bird XFA 13 mm dripline datasheet – 120 mesh filtration requirement, 50-350 kPa compensating range
- Netafim Techflow bid performance specification – 120 mesh or finer filtration, disc grades 40-200 mesh
- ISO 9912-1:2004 – Filters for micro-irrigation: classification
- ISO 18471:2015 – Verification of filtration grade
- FAO – Irrigation manual, Chapter 6: drip irrigation
Need documentation with a quotation? Tell us which decisions the documents must support through our quotation request.
