Who Pays for the SPF Test? Sunscreen Testing Responsibility in a Private-Label Order

The question that ends more private-label sunscreen projects than any formulation problem is not "what SPF can you make?" but "whose name is on the report?" SPF and UVA testing for private label sunscreen is commissioned by someone, performed by a laboratory on a specific sample, and issued to a named sponsor for a specific formula code. Every one of those nouns — sponsor, sample, formula code — is a place where a buyer can end up holding a document that does not cover the product in the carton.

This article sets out how testing responsibility is normally divided between a buyer and a Chinese contract manufacturer, what each test actually measures, why a report is far narrower than it looks, and how to write the ownership and transfer terms into the purchase order before the first sample ships. It does not tell you what SPF to claim. That figure belongs to your own substantiation file, and the rules for it are set by your destination market, not by the plant.

What the tests are, and what each one covers

Sunscreen substantiation is a small family of tests, each answering one question. The method identifiers below are the widely used international references; the current edition and any market-specific method are things to confirm with your laboratory and your regulatory adviser.

Three points that decide who does what:

• In vivo tests are the expensive, slow ones. They need a human panel — ISO 24444 requires a minimum number of valid subjects, and the laboratory recruits, irradiates and reads each one over days. A single in vivo SPF study is a multi-week commitment at a specialised lab, and a failed result does not come with a refund.
• In vitro tests are cheap and fast, and are used to screen. A competent developer runs in vitro UVA and an in vitro SPF estimate on every candidate before spending on the human panel. If a supplier goes straight to in vivo on a first-round sample, either the formula is a well-known base or the supplier is spending your money to learn.
• Every test is performed on a specific sample. The report will name the product, a formula or batch identifier and the date the sample was received. It says nothing about any other formula, and — this is the part that catches buyers — nothing about a later batch made to the same formula unless the retained test sample and the production bulk can be shown to be the same thing.

The US treats sunscreen as an over-the-counter drug, and the testing methods it recognises are set out in federal drug rules rather than in the ISO family; the EU and UK use their own guidance on what a UVA claim must demonstrate relative to the SPF. The factory page for Yadun Cosmetics states the plain version of this: buyers exporting sun protection should confirm the destination market's regulatory route early. The plant does not decide which method you need. You do, and the laboratory you brief needs to know before the panel is recruited.

OEM versus ODM: where the responsibility line actually falls

The split follows the formula's origin. The factory page defines the two arrangements in the standard way — OEM, where the buyer supplies the formulation and brand; ODM, where the factory supplies an existing formulation for the buyer to brand — and testing responsibility tracks that definition.

The trap sits in the second and third rows. A factory may hold a test report for a house sunscreen base, and the salesperson will say so. Ask four questions before you treat that as your substantiation:

1. In whose name was it issued? If the sponsor is the factory, or a previous customer, the report may be reused only if the laboratory and the sponsor agree to a transfer or authorisation letter for your brand. Some laboratories will re-issue; many will not.
2. Which formula code and which batch? Match it to the formula sheet you are being quoted. If the code differs by a suffix, ask what changed.
3. Which method, which market? A report generated to one market's method may not be accepted in another.
4. Has the formula changed since? Raw-material substitutions, a fragrance swap, a new emulsifier grade — any of these can alter the film and the result. A report older than the last formula revision covers a product that no longer exists.

Whether any of this plant's ODM sunscreen bases carry existing reports, and in whose name, is not published. Neither is the scope of the in-house lab that the factory page lists among plant functions — it may be a QC lab (batch release checks) rather than a development lab (in vitro screening). Both are questions to put in writing, and neither answer changes the principle: for a private-label brand, the safest route is a report in your own name, on your own formula code, from a laboratory you chose.

Why the retained sample matters more than the certificate

Here is the detail that experienced sunscreen buyers watch and first-timers do not. A report is only as good as the link between the tested sample and what leaves the filling line. The laboratory tests what it was sent. If the sample was a 200 g pilot batch hand-mixed in the development lab, and production is a 500 kg batch compounded on a kettle with a different homogeniser and cooling profile, the two products can differ in filter dispersion and film-forming behaviour — the very things SPF depends on.

Practices that close that gap:

• Test on a batch made on the production equipment, or at least on a scale-up batch, rather than on a bench sample. This costs a compounding run before you have a report, which is why it is skipped.
• Have the plant retain a sealed portion of the tested batch and record the batch number on the test request so the report, the retained sample and the batch record refer to one another.
• Keep the formula code frozen after testing. Any change — including a "like-for-like" raw-material substitute from a different supplier — triggers a review of whether the report still applies. Put that in the contract as a change-notification clause.
• Run in vitro UVA on each production lot if your market's UVA claim depends on it. In vitro tests are cheap enough to use as lot-release checks; in vivo tests are not.

The same discipline applies to the shelf-life work that sits alongside SPF: a stability study on the wrong batch tells you nothing about the right one. The CMH article on stability testing and shelf life for Chinese cosmetics OEM orders covers how that programme is normally structured and what to ask for.

Who pays, and what it means for your timeline

Cost allocation is negotiated, but the customary positions are consistent across the trade:

• OEM (your formula): you pay for all testing. The factory's job is to compound and fill to your specification; it has no stake in your claim.
• ODM (their formula, unchanged): if an existing, transferable report exists, the factory may include the transfer at low or no cost. If you need a new report in your own name, expect to pay the laboratory directly, and expect the factory to supply the test samples free or at bulk cost.
• ODM (modified): you pay, because the modification is yours.

Two contract points follow. First, agree who selects the laboratory. If you pay, you choose; and a laboratory you can contact directly, that issues the report to you, that you can ask to verify the report's authenticity, is worth more than a lower quote through the factory. The named commercial testing groups — SGS, Intertek, Eurofins and specialised photobiology labs — all take direct instruction from overseas sponsors. Which laboratories this factory has worked with is not published; ask, and then contact the lab yourself.

Second, sequence the testing against the production schedule. Yadun's published terms are three days to sample a standard formulation, seven for a custom one, and 15–30 days of production after sample approval. An in vivo SPF study takes longer than the production run. If you wait for the report before releasing the purchase order, your launch date moves by the length of the study; if you release production before the result, you carry the risk of a failed panel on a filled batch. The middle path most brands use is to screen in vitro on the approved sample, release the pilot production, and run the in vivo panel on product from that pilot batch — accepting that a fail means relabelling or reworking 2,000 units rather than a whole programme.

Writing the ownership terms into the order

Report ownership is settled by paperwork, not by goodwill. Before the first purchase order, the following should be in writing — in the quotation, the development agreement, or the PO terms:

1. Sponsor of record. "All efficacy test reports commissioned for this product shall be issued in the name of [your company]."
2. Formula code freeze. The exact formula identifier the report refers to, with a clause that any change requires written notice and a review of test validity.
3. Retained samples. Quantity, storage conditions and retention period for the tested batch, held by the factory and available on request.
4. Transfer of any pre-existing report. If a factory-held report is being relied on, an authorisation letter from the sponsor and the laboratory naming your brand, attached to the PO.
5. Raw data access. The right to receive the full report including individual subject results, not a one-page summary certificate.
6. Laboratory contact. The laboratory's name, address and report number, so the report can be verified by contacting the lab directly.
7. Confidentiality of the formula. In an OEM order, a clause that the factory will not test, sell or reuse your formula for other customers.

These sit alongside the general document set for a first order — licence copies, batch records, certificates of analysis — which the CMH guide on what documents to ask a Chinese supplier for before a first order lists in full.

Common questions

Can I just use the factory's SPF report for my label?

Only if it was issued to the exact formula you are buying, the method matches your market, and the sponsor and laboratory agree to transfer it to your brand. In most cases at least one of those three fails, and you will need your own report. Budget for it from the start.

Does an in-house lab at the plant replace third-party testing?

No. An in-house lab, where one exists, is useful for in vitro screening and lot-release checks; the substantiation report for a market claim comes from an independent laboratory. Whether this plant's lab does screening or QC only is not published — ask.

What happens if the in vivo result comes in below the target?

The formula goes back to development, and the batch made to it cannot carry the intended claim. This is why in vitro screening exists, and why the format decisions covered in the companion article on sunscreen formats and emulsion types are made before the panel is booked: a W/O emulsion and an O/W lotion at the same filter load can behave differently on skin.

Should the factory know my target SPF?

Yes — as a development target, so the filter system is designed to reach it with margin. But the target is a formulation input, not a factory claim. The number that goes on the pack is whatever your report supports.

What to ask the supplier next

Take these to the plant before you request the first sample:

1. Is the in-house lab a QC lab or a development lab? Can it run in vitro SPF or UVA screening, and on what instrument?
2. Which third-party laboratories have you sent sunscreen to, and for which methods? Ask for a redacted sample report so you can see the format.
3. For any house sunscreen base you are quoting: does a test report exist, in whose name, for which formula code, and to which method?
4. Will you retain a sealed sample of the tested batch, and for how long?
5. Will you make the test batch on production equipment, and can I see the batch record?
6. What is your change-notification practice when a raw material is substituted?
7. Will you agree in writing that reports commissioned for my product are issued in my company's name?
8. For OEM: will you confirm in writing that my formula is not reused for other customers?

Yadun Cosmetics is a workable case for these questions: a Baiyun District plant operating since 2009 with 100–500 staff, listing sunscreen lotions, creams and primers within its first product line, offering both OEM and ODM terms, with a lab among its listed plant functions and a published minimum of 2,000 units. The factory profile gives the scope; the eight answers above tell you whether the report you end up holding will cover the product you ship.