How to read a certificate.

What a certificate reports

A certificate reports the analyses listed on it, for the vial we received, as it was on the date we tested it. Every value is printed as measured, with the method that produced it, rather than smoothed into a verdict. The certificate says it in its own standing words:

Results relate only to the specific samples tested. Reproduce only in full.

It covers the vials we received, not a lot

We test what arrives. A result describes the material in the vials we received and nothing else: not the rest of that lot, not a later batch, not a different supplier's version of the same compound, and not the same lot after it has been stored, shipped, or repackaged by someone else. A certificate reproduced beside a product does not travel to other production.

Reproduce it only in full

An extract of a certificate is not a certificate. A single number lifted out of one (a purity figure without its method, its date, or the impurity reported beside it) misrepresents the work, and we treat it as a misuse of the document rather than a shortcut.

No accreditation is held or implied

Premier Analytical Sciences conducts its testing in accordance with ISO/IEC 17025 requirements; it is not an ISO/IEC 17025 accredited laboratory.

Nothing this laboratory issues is a certification mark, an approval, a registration, or a regulatory clearance, and nothing on this site or on a certificate may be presented as one. The case for believing a result here is the method printed beside it, the photograph of the vial it came from, and the fact that a record, once published, cannot afterwards be edited, unlisted, or quietly deleted, whether it flatters the material or not. That is the whole of the argument the lab is willing to make.

It is not an endorsement

In the certificate's own standing words: Premier Analytical Sciences does not endorse any company or product listed in this register. A record here states what was measured, nothing more. Testing is commissioned and paid for by the party named on the record. Paying for an analysis buys the analysis; it does not buy the result, and it does not buy the laboratory's approval of the seller.

A company's own profile, where one appears beside a listed certificate, is in the company's words: its website, the location it states, its contact email, and its logo. We show them as supplied, we do not verify them, and showing them is not an endorsement.

One test is not another test

Each analysis answers only its own question, and the certificate says so: This certificate reports only the analyses listed … An endotoxin screen is not a sterility claim. Purity is not identity. Identity is not quantity. None of them is a finding about contamination that was never screened for.

It is not a safety or suitability finding

Nothing on a certificate states that a material is safe, effective, pure enough for a purpose, or fit for use in or on a person or an animal. In the certificate's own standing words: its results are intended for research use only — the material tested is not approved for human or veterinary use, or for therapeutic, diagnostic, or clinical applications. Results should be interpreted by qualified professionals within the scope of the intended research. We do not make that determination, and no combination of values here should be read as making it. A certificate is not medical advice, not a quality approval, and not a substitute for whatever regulatory approval a use of the material would need.

When no value can be reported

Some rows carry no number. Where a value could not be reported, the certificate prints an em dash and the controlled reason for it, and no unit, because a reason is not a measurement. The row itself is neither a pass nor a failure: it is the laboratory declining to report a number it cannot stand behind, which is the one case where an empty space is the honest answer.

A vial with one analysis that could not be reported, while others could, is marked FLAGGED rather than PASS, because the certificate does not print a clean pass over a missing number. A vial with nothing reportable at all is marked NOT REPORTABLE.

Current, superseded, withdrawn, and the word on each vial

Each record is in one of three states. A current record is the version in force. A superseded record was replaced by a later revision under the same number; it stays readable, and the register shows why the revision was issued. A withdrawn record should no longer be relied on; it stays public permanently, with the reason beside it. A record is never deleted to make a result go away.

Separately, each vial on a certificate carries its own word. PASS means everything reported on that vial reported cleanly. FLAGGED means something a reader must not miss: content below 50 or above 150 percent of the label claim, a result stating that the material does not conform, an analysis that could not be reported while others could, or a vial identified as a different compound from the one stated. NOT REPORTABLE means nothing on that vial could be reported. The line at the top counts the vials that pass.

Checking that a certificate is real

Do not trust a PDF because it looks right. Every certificate prints its number, an excerpt of the digest of its own contents, the address to check it at, and a QR code that opens the same address. Open that address, or type the number into the register. The page shows the certificate as we released it and lets you open the same PDF, and if the document in front of you disagrees with that one, ours is the record this laboratory stands behind. A private certificate is not listed and does not appear when anyone browses or searches the register, but its exact number opens it the same way, on a page that says it is private. A revised certificate keeps its number. The page shows the current revision and marks earlier ones superseded.

What is specimen, and what is real

The worked example on the home page, the rows and the certificate opened beneath them, is specimen, fictitious and for illustration only. Its numbers, values, commissioning parties, and photographs show the form of a record rather than testing that was done.

Every record on the register is real, and a certificate issued for a real order is real. Its number, its methods, its values, and the signature on it are the laboratory's own record, and nothing on this page qualifies them.

When the vial is not what it was said to be

If our identity analysis finds a different compound from the one stated, the certificate says so between the name and the verdict: what the vial was submitted as, what we identified it as, and that the results are reported for the compound identified. The vial is marked FLAGGED however well it tested. The register lists the record under the name it was submitted with, and the certificate carries the identification.

Percent of label, and blends

Percent of label is the content we measured, divided by the amount the label claims, as the client stated it. It checks the claim, so it is only as meaningful as the claim. We record the claim as stated and do not verify the label. On a blend, each compound is measured against its own claimed amount.

The client's designation, and the photographs

A name the client gave the material, such as a product code, prints as the client's designation beside the compound's chemical name. It is the client's name for the material, not ours, and it never replaces the chemical name. Each vial is photographed as it arrived, with its label showing, and again wearing our laboratory number. Both photographs print on the certificate, except that a certificate issued without the client's name leaves the first one off, because the label would name them.

Questions about a record

Questions about a certificate go to the laboratory that signed it, not to the party who commissioned it. These notes are adopted as of 2026-09-25; the terms they sit under are on the terms of service page.