How often should the activity of reworked magnesium oxide be tested?

To verify that every batch of reworked parts satisfies ≥60% of the industry standard (HG/T 3928-2012), the activity of reworked magnesium oxide should be checked. This will prevent insulation failure or early problems caused by batch fluctuations.

 

1. Testing Frequency Principle: Each batch needs to be examined.

Sampling Requirements: To guaranty representativeness, at least three samples must be gathered from each revised batch for testing.

Testing Timing: To avoid moisture absorption impacting activity, samples should be collected and delivered for testing within 24 hours of sintering being finished and cooled to room temperature.

Testing Basis: A CNAS-certified laboratory uses the hydration method as outlined in the national standard HG/T 3928-2012 for determination.

A key component of quality closed-loop management, batch testing may efficiently detect possible hazards such changes in raw materials and process variations.

 

2. When should the frequency of testing be increased?

Strategies for Scenario Testing

Raw Material Batch Change: To ensure stability, two successive batches of the new raw material must be tested.

Sintering Process Adjustment: To ensure parameter compatibility, the first three batches following the process modification are thoroughly examined.

Equipment Overhaul or Restart Following Shutdown: To rule out contamination or parameter drift, the first batch following restart is put through more stringent testing.

Abnormal Returned Parts: To avoid batch-related risks, track down and retest the same batches.

Experience has shown that dynamically modifying the testing frequency can lower quality risks and speed up problem response.

 

3. Suggested Testing Facilities (CNAS Accredited)

Sending samples to the following organisations is advised in order to guaranty reliable and traceable results:

Zhongxi Testing (supports more than 22 tests, nationwide coverage)

Wuhan Kehai Inspection Co., Ltd. (quick report generation, localised service)

Wuhan Branch of Guangfen Testing & Certification Co., Ltd. (with an emphasis on high-purity material analysis)

As the legal foundation for quality release, the test report must display the CMA/CNAS mark.