Product testing is generally divided into two categories:

1) entrusted test: the test sample is submitted by the entrusting party on its own, and the laboratory only tests the incoming sample. Therefore, the test conclusion reflects the quality attribute of the submitted sample, and the test report is only valid for the submitted sample.

2) supervision and spot check: the product quality supervision department conducts random spot check on relevant products according to the product quality law. Supervisory spot check is not whole project inspection, because this inspects a report to check a project to product place only whether accord with a standard to undertake judging, what inspection report place reflects is product quality condition at that time.

Generally speaking, commissioned test report is in the majority. As the product quality may change with the change of environment, time and other conditions, the conclusion of the test report can only reflect the quality characteristics of the test in theory.

Therefore, the test report has no validity in theory, but in practice it is impossible to maintain the validity of the test report for a long time for various reasons. Therefore, the test report will indicate the time when the laboratory receives the sample and issues the report.

 

2. How long is the product certification valid?

According to the test report issued by the product certification certificate is valid, that is because the product certification not only involves the design of the product, but also includes the enterprise quality management, therefore, once a year of supervision, certification certificate validity is usually four years. PS: the expiration of the certificate means that the test report issued for this certification is invalid.

In order to regulate the mutual recognition of CB reports by certification bodies of various countries and improve the effectiveness of reports, the international certification organization iece-cb system suggests that CB reports whose validity exceeds three years or whose validity exceeds three times should be submitted for sample verification.