Free SDS comparison
Your supplier sent a new sheet. This tells you what actually changed.
A reissued safety data sheet arrives with no note saying what moved. Section 16 says revised, and the reader is left reading 16 sections against a copy in a folder. Drop both files in and every field is compared: hazard statement codes, the signal word, the flash point, the UN number, the transport class, the packing group, and which of the 16 sections lost content.
The same screen compares two language versions of one sheet, which is the harder problem. A CAS number, a flash point and a UN number are the same in Spanish as in English, so any difference between the two is a defect in one of them. Each difference is printed with both sides and the file it came from.
Sheet one
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The copy you hold on file, or the English version.
Sheet two
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The copy that just arrived, or the other language version.
Both files are read once to produce the report below and neither is stored. Up to 8 MB each. No email, no account. Three comparisons an hour, because each one reads two sheets.
How two languages are compared without translating anything
Nothing here translates a sentence, and no sentence in one sheet is ever measured against a sentence in the other. That would only tell you whether a translator agreed with a machine. Instead two things are compared, both of which are language independent.
First, the facts. Hazard statement codes, the signal word, the CAS number, the physical state, the flash point, the boiling and melting points, pH, the UN number, the transport hazard class and the packing group. H225 is H225 in all 24 official EU languages, and 56 °C is 56 °C. So a code printed in one version and absent from the other means one of the two label sets is wrong, and whoever labelled the drum worked from one of them.
Second, the wording — against the law of the language it is written in, not against the other file. Annex III to CLP EC 1272/2008 fixes each hazard statement in all 24 official languages, verbatim, and that table is held here with its EUR-Lex source. A Spanish sheet is read against the Spanish column and an English sheet against the English one. A statement printed in wording the annex does not use is reported with both sentences quoted. A language we hold no published table for is named as not checked, never as correct.
Two revisions are read differently on purpose. A difference between two versions of a sheet is usually the point rather than a defect, so it is reported as changed and not as a conflict. Two things are still conflicts in a revision comparison: two sheets that differ and carry the same revision date, and two that differ and carry the same version number. Either one makes the copy in your folder impossible to match to the version it was received as.
It does not decide which sheet is right. A difference names both sides and the file each came from; a different grade, a solution or a different test method can move a number legitimately, and a reclassification has a reason that belongs in Section 16 of the newer sheet. Nothing here means either sheet is approved, certified or audit-passed, because a comparison of two documents cannot establish any of those.
Both files are read once, in memory, to produce the report. Neither is stored, neither is added to a library, and neither is used for anything else. A formulation you paid to develop stays yours.
If the comparison finds a conflict
Two language versions that classify one product differently is a supplier question before it is yours: ask which classification is current and which sheet was reissued last. If you are the one issuing the sheet, a draft SDS is $5 per document, assembled from named sources, white-labeled with your own company details, delivered as an editable .docx.
To read a single sheet against the 16-section format and against its own numbers, use the free SDS check. A formula rather than a single chemical is classified by CLP EC 1272/2008 Annex I summation, which is the mixture path.