Pallet

Batch

Testing Procedure

Sample

When a sample fails to meet the required specifications in accordance with API Std 936, any retesting must maintain strict consistency with the original conditions to ensure validity and comparability of results.

API 936 states:

“If a sample fails to meet any requirement, resampling shall be permitted. However, retesting shall be performed using specimens from the same batch, pallet, and sample as the original test. The same testing procedure must be used.”

— API Std 936, Section 6.2.3​

Explanation of Matching Terms:

Pallet: To ensure material consistency.

Batch: Revalidates results without introducing variability from a new production lot.

Testing Procedure: Methodology must not change to avoid skewed comparison.

Sample: Must be the original sample to confirm initial findings.

Therefore, all of these factors must remain the same. The only item in your provided list that is not required to match is “Inspection methods” — it is not part of the retesting condition clause.