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What is the NACE MR0175 criteria for retesting HIC?

Question 1:
We have a question on interpretation of clause B.2.2.2 e) in annex B of MR0175 / ISO 15156-2:2015. Third paragraph says: Re-testing is permitted as follows. If a single specimen fails to satisfy the acceptance criteria, … two further specimens may be tested. If after HIC testing a 0.5” plate to TM0284, two specimens out of three fail to satisfy the acceptance criteria, is it permitted to test four further specimen in order to qualify the batch?

Answer 1:
MR0175 / ISO 15156-2:2015 – Annex B, Clause B.2.2 Qualification of manufactured products; this clause allows for re-testing in the event of one of the required triplicate specimens (per test batch) failing to satisfy the acceptance criteria. In addition, the clause also states that the cause of the failed performance shall be investigated. If in fact the material is found to conform to the manufacturing specification, then two further specimens may be tested. However, it is not implied that multiple specimens may be subject to re-testing for a given batch. The particular paragraph closes with the statement that further retests shall require the purchaser’s agreement.
This question is in relation to NACE MR0175/ISO 15156-2/B.2.2.2
Reference MP inquiry #2017-21

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