ISO/PRF TR 5729

TECHNICAL ISO/TR
REPORT 5729
First edition
Evaluation of physical parameters
of filter paper substrates for the
determination of the ignition
propensity of cigarettes
PROOF/ÉPREUVE
Reference number
ISO/TR 5729:2021(E)
ISO 2021
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ISO/TR 5729:2021(E)
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© ISO 2021

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Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Parameters to specify filter papers for use as substrates in ignition propensity testing .........1

5 Establishing acceptable ranges for filter paper physical parameters ..........................................................2

6 Correlation of paper physical parameters with ignition propensity testing .........................................3

7 Report — substrate papers physical parameter testing ............................................................................................. 5

7.1 Substrate specifications .................................................................................................................................................................. 5

7.2 Mean ±3 standard deviation plots based on specifications ............................................................................. 6

7.3 ANOVA outputs ....................................................................................................................................................................................10

7.4 Control Charts .......................................................................................................................................................................................13

8 Conclusion ................................................................................................................................................................................................................17

Bibliography .............................................................................................................................................................................................................................18

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This document was prepared by Technical Committee ISO/TC 92, Fire safety, Subcommittee SC 1, Fire

Any feedback or questions on this document should be directed to the user’s national standards body. A

The ISO 12863 standard test method for cigarette ignition propensity specifies Whatman No. 2 (or an

equivalent paper) as a suitable substrate. An expert group was established within ISO/TC 92/SC 1 in

2012 with the objective of defining a set of paper parameters that a substrate paper ought to meet.

When testing cigarettes according to the ISO 12863 standard, it is recommended that the paper produce

— are statistically indistinguishable from the currently available substrate paper; and

The study presented in this document used Whatman No. 2 filter papers that were produced after 2011,

when Whatman moved the production facility from UK to China . An in-depth analysis of the effect of

this change on ignition propensity testing results was published in Reference [1].

This document recollects and evaluates physical parameters of filter paper substrates for the

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 12863, Standard test method for assessing the ignition propensity of cigarettes

For the purposes of this document, the terms and definitions given in ISO 12863 apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

4 Parameters to specify filter papers for use as substrates in ignition propensity

The expert group reviewed previous activities related to cigarette ignition propensity standard

development and the main scientific literature on substrate paper properties. Experts from the filter

paper industry also shared commonly used filter paper parameters used for quality control and

It was agreed by the experts that paper weight alone is unlikely to represent sufficient specification.

As detailed research into the influence of each filter paper parameter on the results of ignition

propensity testing would be beyond the capabilities of the expert group, it was decided to proceed

with a conservative approach, keeping all substrate paper physical parameters. Although this approach

could lead to the over-specification of the substrate, experts from filter paper manufacturers agreed

Correlation testing between physical filter paper parameters and ignition propensity results would

require significant effort and ought therefore to be limited to a minimum. Therefore, initial experiments

were designed in order to obtain initial insights with a feasible amount of effort.

The first collaborative study used Whatman No. 2 substrates collected from LIP laboratories. The aims

— to establish a range for the critical substrate parameters based on the measurements on Whatman

— to compare the range for critical parameters between Whatman No. 2 substrates and substrates

For this study, 9 different Whatman No. 2 batches were sourced from 3 LIP testing laboratories.

Four alternative substrate manufacturers provided their own substrates and took part in the testing:

In this study, the mean ±3 standard deviation ranges for the Whatman papers were:

A second collaborative study was performed using three substrate papers from an earlier NIST

study on ignition propensity testing. The aim was to use these data as a specification for other

Table 1 shows the proposed specifications for ignition propensity substrate paper that were selected

No correlation tests between ignition propensity results and paper physical parameters had previously

been performed. However, such tests are necessary in order to confirm the set of parameters. In order

to validate the proposed set of substrate specifications, a further study was therefore designed. The

— to carry out ignition propensity testing with the different filter paper substrates;

— to check whether the different substrates (when manufactured to the same specifications) provide

— to enable the use of different filter paper substrates that meet the criteria specified by the expert

Testing was carried out with the help of CORESTA and the voluntary participation of 14 laboratories:

The three paper manufacturers (MACHEREY-NAGEL, Delfort Group and Hahnemuehle) provided

120 000 filter paper circles each as substrates for the CORESTA study on ignition propensity testing .

The paper manufacturer Whatman did not provide samples. Rather, the participating laboratories used

the available papers in their lab. In order to have sufficient material for the subsequent testing of the

physical parameters, the participating CORESTA laboratories sent seven packs (700 filter circles) of the

The statistical evaluation showed no significant difference in ignition propensity results between the

In the last step, a collaborative study on the physical parameters of the substrates used in the IP-study

was performed with the aim of confirming the ranges previously agreed upon. For this test, the papers

The study confirmed that physical parameter values for the substrates were within the specified

The aim of this analysis was to gain an understanding of the different substrates measured (Whatman,

Tervakoski, Hahnemuehle and Macherey-Nagel) across the different laboratories. The two main