Objective To improve the the capabilities of laboratories in the determination of rubber pharmaceutical packaging materials.Methods According to the relevant documents of the China National Accreditation Service for Conformity Assessment(CNAS),the uniformity and stability tests were conducted on the proficiency testing samples,and the ash content determination results from each participating laboratory were analyzed.The robust z-scores were used to evaluate the satisfaction of the proficiency testing results of the participating laboratories.Results The proficiency testing samples were uniform and stable.Among the 59 laboratories that participated in the proficiency testing,58 laboratories retrieved their proficiency test results,and the results were evaluated as satisfactory,with a satisfaction rate of 98.31％.Conclusion The laboratories participating in the proficiency testing have an overall good ability to detect the ash content of rubber pharmaceutical packaging materials.
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