ISO Certificate Apostille for Thailand
The Situation
Sending a ISO certificate to Thailand looks like a two-step job: notarize, then apostille. In practice there are three points where the file stops moving, and all three sit outside the Apostille stage.
Thai consulates examine the document differently from a Chinese notary office, and the difference is what causes the returns.
What Actually Went Wrong
First stop: the certification body must be accredited by a body the receiving authority recognises, and certificates from unaccredited bodies carry no weight.
Second stop: the certificate must be within its validity period, and expired certificates cannot be rescued by an Apostille.
Third stop: Thailand requires consular legalisation until the Convention takes effect on 28 February 2027.
How It Was Resolved
Work the three in order and the Apostille becomes the easy part.
Get the certification body's accreditation certificate alongside the ISO certificate first. Then have the notary certify the fact rather than the copy. Then verify the name and date details against the receiving requirement. The Apostille attaches at the end and takes five to ten working days.
Thailand deposited its instrument on 30 June 2026 and is not covered until 28 February 2027, so consular legalisation applies until then. That means the text of the notarization is read, not just the seal — which is why the order matters more than the effort.
The General Rule
For Thailand specifically, Consular legalisation dominates the timeline until the Convention takes effect.
The general rule: the Apostille certifies that a signature and seal are genuine. It does not certify that the document says the right thing. Everything the receiving authority needs to be true has to be true before the seal goes on.
Check These Before You Submit
- Retrieve the certification body's accreditation certificate alongside the ISO certificate
- Have the notarization certify the fact, not the copy
- Verify the certificate must be within its validity period, and expired certificates cannot be rescued by an Apostille
- Confirm Thailand does not require a further attestation beyond the Apostille
Legal Basis
Hague Apostille Convention of 5 October 1961; China in force since 7 November 2023.