5th Proficiency Test (2022) on Diffusion Capacity of Cigarette Papers
PTM Technical Report
This proficiency test is the fifth one carried out by the Physical Test Methods (PTM) Sub-Group to assess the capability of the participating laboratories to measure diffusion capacity using the CORESTA Recommended Method (CRM) No. 77 as a general guideline.
The results from this study serve as a check that laboratory procedures and their development over time did not lead to a substantial increase in between-laboratory variability and it further offers each laboratory the possibility of assessing its performance in comparison with other laboratories and to derive actions for improvement.
The robust coefficient of variation for measurements on LIP bands did not change substantially over the five proficiency tests and has remained at about 10 % to 12 %. Also, this study did not show any significant difference in mean values and variability obtained with instruments from different manufacturers.
The Sub-Group recommendation was to carry out further proficiency tests on a regular basis to ensure that laboratories do not drift apart and that the between-laboratory variability does not increase over time. It was also recommended to continue attempts to identify a reference material and develop a ‘gold-standard’ method based on CRM 77 that can be used to assign values to calibration or reference standards.
CRM 77 - Determination of Diffusion Capacity by Measurement of CO2 Transfer Rate Through Materials Used as Cigarette Papers and Cigarette Papers having an Oriented Zone of Reduced Diffusion Capacity (June 2019)
Report - 4th Proficiency Test (2020) on Diffusion Capacity of Cigarette Papers (November 2020)
Report - 3rd Proficiency Test (2017) on Diffusion Capacity of Cigarette Papers (May 2017)
Report - 2015 Proficiency Test Report - The Measurement of Diffusion Capacity of Cigarette Papers (September 2015)
Report - Collaborative Study to Evaluate a Paperboard Substitute for a Diffusion Capacity Standard (August 2015)
Report - 2014 Proficiency Test Report - The Measurement of Diffusion Capacity of Cigarette Papers (July 2015)