How to Shortlist Pipe Suppliers in China: A 9-Criteria Scoring Framework

A supplier shortlist fails in one of two ways. Either you cut a good factory because its English was poor, or you keep a bad one because its brochure was excellent. Both happen for the same reason: the criteria that decide the cut were never written down, so the decision quietly ran on impressions.

This page is a scoring instrument. Nine criteria, a weighting you can change, and — the part that matters — a public database behind every single one, so that no criterion depends on the supplier's own word. You can run it on four suppliers in an afternoon without leaving your desk.

On this page

• Why this page is written by one of the suppliers you might shortlist
• The nine criteria, and the public source that settles each one
• Legal entity first: the checks that cost nothing
• Certificates: read six fields, then check the register
• Scoring IFAN with our own rubric: where we pass and where we do not
• From scores to a shortlist: threshold, tie-break and disqualifiers
• A worked shortlist: four suppliers, one afternoon

Why This Page Is Written By One of the Suppliers You Might Shortlist

IFAN Group manufactures PP-R pipe and fittings in Zhejiang and sells to importers in Ghana, Nigeria, Kenya, Cameroon and about 120 other countries. If you are shortlisting Chinese pipe suppliers, we are a company that would like to be on your list. That is a commercial interest in the outcome of the exercise this page is teaching you to run, and you should read everything below with it in mind.

Most vetting guides you will find for this query are published by sourcing agencies and inspection companies. They have a commercial interest too — theirs is in selling you an audit — but because they are not suppliers, they never have to declare it. We do.

What the disclosure changes about how you should read this

It changes one thing specifically. A rubric written by a supplier is only useful if the supplier can lose on it. So every criterion below is anchored to a source that we do not control: a government registry, a certification scheme's own register, an accreditation database. Where a criterion could only be settled by asking the supplier, it was cut from the rubric rather than softened, because a criterion that runs on trust is not a criterion, it is an interview question.

Then, further down, we score ourselves. We publish the criteria where IFAN currently scores full marks and the criteria where we do not — two lapsed certificates, a contradiction between what our product pages claim and what our certifications page documents, and a German certification body listing a forged certificate that carries our own company name. That last one fails us on our own rubric. We publish it anyway, because a framework its author has quietly exempted itself from is worth nothing to you.

What this article is not

It is not a ranked list of manufacturers. We keep those jobs apart deliberately: our verified profiles of PPR pipe manufacturers in China is where named companies get compared against each other, with the market context and the profiles. This page is the instrument you would use to build your own list, applied to whichever suppliers you are actually talking to — including any that article never mentions. If you want the comparison, read that one. If you want the method, stay here.

The Nine Criteria, and the Public Source That Settles Each One

Here is the whole rubric in one table. Score each criterion 0 to 5, multiply by the weight, and total out of 100. The weights are our starting opinion, not a law — a buyer importing into a market with hard certification enforcement at the port should push compliance weight up and drop something else. Change them before you start, not after you see the results.

#	Criterion	Weight	Where you verify it yourself
1	Legal entity exists and is active	15	NECIPS, China's official registry, at gsxt.gov.cn
2	Entity on the certificate matches the entity on the invoice	15	Same registry, cross-read against the certificate PDF
3	Drinking-water material approval for your market	15	NSF certified components listing · WRAS Approvals Directory
4	Product certificates are current, not merely issued	12	DVGW CERT directories · JAS-ANZ register
5	Management-system certificate is accredited, not self-declared	10	IAF CertSearch
6	Published spec range covers what you actually buy	10	The supplier's own published catalogue, compared against the standard it cites
7	Independent corroboration that the company trades	8	Canton Fair exhibitor records
8	Manufacturing depth: tooling and moulds in-house or bought in	8	Published mould-shop footage, or a live video call through it
9	Commercial terms stated before you ask	7	The supplier's published MOQ, sampling and packing terms

Two design decisions in that table are worth defending, because they are where most sourcing checklists go soft.

Why "responsiveness" is not on the list

Almost every competing checklist scores how fast a supplier replies and how good their English is. Both are real signals of something — but of the sales office, not the factory. A trading company with four salespeople will out-respond a factory with two, every time, and the buyer who scores responsiveness heavily systematically selects for middlemen. Judge the reply on whether it answers the technical question you asked, and leave the stopwatch out of the scoring.

Why criterion 6 is scored against the standard, not the sales sheet

A published range only means something next to the standard it claims. Our own published range, for instance, is DN20–DN160 at PN12.5–PN25 in PP-R 100 grade to DIN 8077/8078 and ISO 15874 — which you can read on our PP-R supplier page and check against the dimension tables in the standard itself. If a supplier lists sizes that the cited standard does not define, or a pressure class the material cannot support at your water temperature, the mismatch tells you the sheet was written by marketing. That is a real deduction, and it takes two minutes.

Legal Entity First: The Checks That Cost Nothing and Eliminate Most of the List

Criteria 1 and 2 carry the heaviest weight because they are the cheapest checks with the highest kill rate. They are also the ones buyers skip, because a business licence looks official and a photograph of one feels like evidence. It is not: a licence photograph proves that a licence exists somewhere, not that it belongs to the company emailing you.

Every registered Chinese company has an 18-character Unified Social Credit Code printed on its licence. The structure is fixed by GB 32100-2015: position 1 is the registering department, position 2 the entity category, positions 3 to 8 the administrative division of the registering authority, positions 9 to 17 the subject identifier, and position 18 a checksum over the preceding seventeen. Two of those segments earn their keep. The checksum means a code invented for a forged licence will not validate, and a code copied from a real company will validate but resolve to a different name than the one on your quotation.

Positions 3 to 8 are the segment buyers over-read. They record where the company was registered, not where it manufactures, so a mismatch against the claimed factory address is a question to ask — not proof of a trading company. What settles that is the entity's scope of business, which the registry shows you directly.

A photograph like this can be sent by anyone, including a company that has never owned a machine. The registry entry behind the company name cannot be.

The three-way match that ends most doubts

Take the exact Chinese legal name — not the English trading name, which has no legal standing — and search it, or the 18-character code, on NECIPS, the National Enterprise Credit Information Publicity System operated by China's State Administration for Market Regulation. Basic registration data is free. Then match three things character for character:

• the legal name on the registry entry;
• the legal name on every certificate the supplier has sent you;
• the legal name that will appear on the proforma invoice and the bill of lading.

When those three agree, criterion 2 scores 5. When the certificate names a different entity than the invoice, you have found the single most common structural problem in China sourcing, and it is not necessarily fraud — it is frequently a trading company legitimately reselling a real factory's goods, using the factory's certificates. That may be perfectly acceptable to you. What is not acceptable is discovering it after a quality claim, when you learn that your contract is with a company that owns no machines and the certificates you relied on were never theirs to offer.

One practical caveat: NECIPS is built for domestic users, expects a Chinese-language search string, and its response from outside mainland China can be slow or intermittent — our own request to it on the day of writing timed out at the network level and had to be retried. Budget a few minutes and a second attempt rather than concluding the company does not exist.

Corroborating that the entity actually trades

Registration proves existence, not activity. Criterion 7 asks for one independent trace of the company doing business under that same legal name — and exhibitor records are the cheapest one. The Canton Fair exhibitor directory is public, and a manufacturer that has exhibited under its registered entity has left a record that a shell company has not. Absence is not damning; plenty of good factories sell entirely through distributors and never take a booth. Presence, under the matching legal name, is worth the eight points.

Certificates: Read Six Fields, Then Check the Register

This is where the rubric earns its weight, because certificates are the documents buyers most trust and least read. The failure is rarely that a supplier has no certificate. It is that the certificate covers a different product, expired two years ago, was issued to a different company, or was never issued at all.

On the last point, the certification bodies themselves are unusually blunt. SKZ, the German plastics institute whose mark appears on a great deal of pipe material, publishes a page listing fake SKZ certificates. Its own words: "Unfortunately, it happens again and again that our certificates are misused," and "we will publish fake SKZ certificates that come to our attention in the list below." The list runs to roughly fifteen documented cases and names companies in China, Dubai, Malaysia and Europe, each with a downloadable scan of the forged document overstamped in orange: FAKE!

We have to stop here and say something that a supplier writing a vetting guide would rather not. Our own manufacturing entity is on that list. SKZ publishes a forged certificate naming Zhuji Fengfan Piping Co., Ltd, trade name IFAN, at our Diankou Town address, for PP-R pressure pipes, under SKZ mark number A 4513. We deal with that in full further down, in the section where we score ourselves — but it would be dishonest to cite this list as evidence and let you discover our own name on it afterwards.

The six fields

Before you go near a register, read every certificate for these six, in this order:

1. Issuing body — a named certification body, not a laboratory that merely tested a sample.
2. Certificate or licence number — the string you will search the register with.
3. The holder's legal entity — matched against criterion 2.
4. The exact standard and part — "EN ISO 15874-2" is a claim; "ISO certified" is not.
5. Scope — which products, which sizes. A certificate for one fitting family does not cover a pipe range.
6. Issue and expiry dates — the field that fails most often.

A worked example of the six fields — and of the sixth one mattering. This is our own licence, SMK41122 to AS 4176.8. Its expiry date is on the face of it, and that date has passed.

That last field deserves its own warning. SKZ certificates are valid for five years, and five years is long enough for a certificate to be printed into a catalogue, a website and a sales deck, and to keep circulating there long after it lapsed. A supplier showing you a certificate that expired is not necessarily hiding anything — more often nobody in their office ever looked at the date. But you are the one who will hold the shipment, so you check it.

A note on which scheme to even ask for. NSF's listing covers drinking-water system components and is searchable by manufacturer name, trade name, product type and location; WRAS runs the UK approvals directory; DVGW CERT publishes six separate directories including one for water products; JAS-ANZ holds the register behind Australian StandardsMark licences. Ask a supplier for the approval your destination market enforces, not for the longest list of acronyms — a wall of unrelated marks is a marketing decision, and our guide to which PPR certifications your country actually requires goes market by market.

Scoring IFAN With Our Own Rubric: Where We Pass and Where We Do Not

A rubric that its author cannot fail is a brochure. So here is IFAN scored on the nine criteria above, with the deductions stated as plainly as the passes.

Criterion	Score	Why
1. Entity active	5 / 5	Zhuji Fengfan Piping Co., Ltd, manufacturing since 1993, named on public certificates and on a 2015 provincial designation.
2. Entity matches certificates	5 / 5	The same legal entity appears on the 2015 designation and on the StandardsMark licence.
3. Drinking-water approval for your market	1 / 5	We hold CE to EN ISO 15874, and publish no NSF or WRAS listing. Scored down further because SKZ lists a forged certificate bearing our entity — see below.
4. Certificates current	2 / 5	StandardsMark Licence SMK41122 ran to 4 March 2026 and has lapsed. The Bureau Veritas laboratory recognition ran to September 2016.
5. Accredited management system	3 / 5	Our pages cite ISO 9001 and ISO 14001; we do not publish the certificate numbers that would let you search IAF CertSearch. Ask us for them.
6. Spec range published	5 / 5	DN20–DN160, PN12.5–PN25, PP-R 100 grade, to DIN 8077/8078 and ISO 15874, published with the standard named.
7. Independent trading trace	4 / 5	Public certificate record spanning 2010 to 2021 from four unrelated issuers on three continents.
8. Manufacturing depth	5 / 5	120,000 m² plant, 30+ automated extrusion lines, in-house injection moulding and mould workshop — the mould shop is on video below.
9. Terms stated up front	4 / 5	MOQ is published as one container with mixed sizes accepted. We do not publish a standard production lead time in days.

That totals 73.8 out of 100 on our own instrument. Read it against the rule we set out below rather than as a grade: a total above the threshold does not clear a supplier when a disqualifier is in play, and as the next two sections explain, one is. On our own rubric, for a buyer whose market requires SKZ or a German certification pack, IFAN does not clear criterion 3 on published evidence today — and we would rather write that here than have you find it after the money moves. Treat that as a question to put to us before you decide, rather than a fact to discover afterwards.

The SKZ listing: our entity on a forged-certificate page

Criterion 3 scores 1 out of 5, not 2, because of the finding above, and this is the part of the rubric we least want to write.

SKZ's public list of fake certificates includes an entry for Zhuji Fengfan Piping Co., Ltd, trade name IFAN, SKZ mark number A 4513. The document SKZ publishes is a certificate for PP-R pressure pipes to SKZ specification HR 3.10, showing an initial certification date of 17 December 2020 and an expiry of 17 December 2027, carrying our company name and our Diankou Town address — and SKZ has stamped it FAKE! in orange across the middle. You can open the list and download the scan yourself. We would rather you did than take our summary of it.

Here is what we can and cannot tell you. What is established is that the document exists, that it bears our name, and that the issuing body says it is not genuine.

What is not established — by SKZ or by us — is who produced it. A forged certificate carrying a company's name can be created by that company, or by a third party trading on that name to sell its own goods. Both happen in this industry. We are not going to use this page to assert the flattering version, because a supplier's assertion is exactly the class of evidence this article tells you not to accept.

So apply the rubric's own logic to us. Disqualifier two says that a certificate which does not check out in the issuing scheme's register, and which the supplier cannot support with correspondence from the issuing body, cuts the supplier.

If you are buying PP-R for a market that requires SKZ approval, that disqualifier applies to us today, and you should ask us for SKZ's correspondence before you go further. If your market does not — most of our customers in West and East Africa are in that position — then what this listing should change is the weight you put on any German or UK certification claim we make, including the sentence on our own product pages that we deal with next.

The contradiction on our own website

Here is the deduction we would rather not write. Our product and supplier pages state that we supply "Full DVGW / WRAS / SKZ / CE certification packs for EU and UK tenders." Our own published certifications record documents four things: a CE Certificate of Conformity, number 105139/DJJ829, from Ente Certificazione Macchine, EU Notified Body 1282, covering PP-R, PEX, PE-RT and PB to EN ISO 15874; a Bureau Veritas Recognition of a Test Laboratory under Rule Note NM320; the 2015 Zhejiang Science-and-Technology Enterprise designation; and StandardsMark Licence SMK41122 to AS 4176.8. It does not mention DVGW. It does not mention WRAS. It does not mention SKZ.

Applying our own criterion 4 to ourselves: a claim that a scheme register cannot confirm is worth zero points, and the marketing sentence is the thing that should change, not the score. If you are shortlisting us for a European or UK tender, do not accept that sentence. Ask for the certificate number and search it in the register yourself — DVGW CERT's directories and the WRAS Approvals Directory are open to you exactly as they are to us. If no number comes back, mark us down. That is the correct outcome of the rubric working.

Criterion 8, and what a mould shop actually proves

The eighth criterion asks whether the supplier owns its tooling, because a factory that cuts its own moulds can fix a dimensional problem in-house and one that buys moulds in cannot. It is also the criterion easiest to satisfy honestly and hardest to fake: ask each supplier to show you the mould shop on video, unedited, with the machines running. Here is ours, published, so you know what the evidence looks like when you ask.

"Self-operated processing delivers efficient and durable production at IFAN Mould Workshop" — IFANGroup on YouTube. Ask every supplier on your shortlist for the equivalent.

From Scores to a Shortlist: The Threshold, the Tie-Break and the Automatic Disqualifiers

A score is not a decision. Two rules turn the column of numbers into a shortlist, and the second one matters more than the first.

Rule one: the threshold

Set a pass mark before you score anyone — 65 out of 100 is a reasonable starting line for a first order, and you should raise it as order value rises. Setting it afterwards is how a buyer talks himself into the supplier he already liked. Carry two or three suppliers forward, never one: a single-candidate shortlist has no leverage in it, and you will discover that the moment you discuss price.

Rule two: the disqualifiers, which override the total

Three failures cut a supplier regardless of how well it scores everywhere else, because each one means a document you would rely on is not what it appears to be:

• The registry returns a different legal name than the one on your quotation, and the supplier cannot explain the relationship in writing.
• A certificate number does not appear in the issuing scheme's register and the supplier cannot produce correspondence from the issuing body. Given that SKZ publishes forgeries under its own mark, this one is not paranoia.
• A certificate is presented as current when its expiry date has passed and the renewal cannot be produced.

Notice that none of these is about quality, price or service. They are all about whether the paper is real, because every other assessment you make rests on that paper being real.

What the survivors go through next

Scoring gets you to two or three names. It does not get you to an order, and the rubric is honest about its own limit: it measures verifiable institutional facts, not what comes out of the extruder next Tuesday. The next round is samples against the standard you cited, then commercial terms — MOQ, packing, sampling, price structure and lead time — in writing.

On lead time specifically, be wary of any supplier who quotes a confident universal number: real production dates depend on your size mix and the queue on the day. Ask what a container of your actual mix would take, and get the answer in the same email as the price. Our own twenty questions that cut a supplier shortlist is the question set for that round.

A Worked Shortlist: Four Suppliers, One Afternoon

Here is the rubric run end to end. The four suppliers below are illustrative composites, not real named companies — they are assembled from the failure patterns the registries above actually expose, so you can see the mechanics and the arithmetic before you spend an afternoon on your own candidates.

Supplier	Total	Where it lost points	Outcome
A	86	Certificate number returns nothing in the scheme register; no correspondence from the issuing body.	Disqualified
B	74	No NSF or WRAS listing; no published lead time; moulds bought in.	Carried forward
C	69	Certificate entity differs from invoice entity — explained in writing as a parent-company relationship.	Carried forward
D	52	Registry name mismatch, unexplained; spec sheet lists sizes the cited standard does not define.	Disqualified

Why the highest scorer lost

Supplier A scored 86 — the best English, the fastest replies, the most complete-looking document pack, and the candidate every instinct would have chosen. It was cut on a single check that took four minutes: its certificate number returned nothing in the issuing scheme's register, and when asked, it could produce no correspondence from the issuing body. That is disqualifier two, and it overrides a 34-point lead.

This is the whole argument for scoring rather than judging. An impression-led process would have picked A on the strength of everything that scores well socially. The rubric picked B and C — both less impressive, both explicable — and the difference between those outcomes only shows up months later, at a port or in a quality claim.

What supplier C teaches about explanations

C's certificate named a different entity than its invoice, which is disqualifier one on its face. C survived because it explained the relationship in writing and the explanation matched the registry: a parent company holds the certification, the subsidiary invoices. That is a legitimate structure. The rule is not "entity mismatch means fraud" — it is "entity mismatch means stop and get the relationship in writing before you go further." A supplier who can explain it in one email is fine. A supplier who becomes vague is telling you something.

Every entity question in this framework ends up on a table like this one, answered in writing by somebody who has to sign it.

How long the whole thing takes

Per supplier: registry lookup and name matching, ten minutes; certificate reading and register searches, twenty to thirty depending on how many documents they sent; exhibitor and catalogue checks, ten. Four suppliers fits comfortably in an afternoon, and it is the cheapest afternoon in the entire sourcing process — every hour here is an hour not spent on a claim against a container that has already sailed.

If you want to practise the certificate step on a document set before you use it on a stranger, run it on ours: our published certifications record lists the issuer, the number, the standard and the dates for each one, including the two that have expired. Find the lapse yourself; it is good practice, and it is the check most buyers never make.

If you would rather put criterion 5 to us directly — the ISO certificate numbers we do not publish — ask us for them on WhatsApp. That request is for buyers actively scoring a shortlist; if you are not at that stage yet, the registers above are the better use of your afternoon.

Conclusion

The suppliers who survive a scored shortlist are not always the ones who impress in the first call. They are the ones whose claims resolve to records held by somebody other than themselves — a government registry, a certification scheme, an accreditation database. That is the only real difference between vetting and being sold to.

Score the nine criteria, set your threshold before you start, apply the three disqualifiers without exception, and carry two or three names into sampling. Then apply the same instrument to us. We have published where we fall short — two lapsed certificates, a claim on our own product pages that our own certifications record does not support, and a German certification body listing a forged certificate in our company's name — precisely so that you can. On our own rubric, a buyer whose market demands SKZ approval has a question to put to us before they shortlist us, and we would rather they put it to us directly than infer the answer from a marketing sentence. Publishing that is the only thing that makes the other 2,000 words worth reading.

Frequently Asked Questions