Dry-State Preservation

Like many of the working groups within IBRG, the Dry-State Preservation Group is comprised of representatives from various industries (eg paint and plastics), preservative manufacturers, testing institutes and independent testing laboratories and academic institutions. The projects arise from needs within the coatings industry and attempt to encompass both the latest understanding of the technology and to be in line with the most recent legislative requirements. The group is led by members of from industry to ensure relevance and acceptance of the methods the group develops, while ensuring the needs of the preservative industry and regulators are met.

Current activities include:

Dry-Film Fungal Testing

During the 1970's and early 1980's, the work of the IBRG Paints Group was focussed on investigations into fungal growth on paint films. From this and extensive ring tests a standard test protocol was developed which has gained wide acceptance in the paint industry and forms the basis of BS3900 Part G6. The method was validated by both laboratory studies and field trials and members of IBRG are providing input into the latest revision of the standard.

Dry-Film Algal Testing

As a continuation of the work on dry-film fungicides, IBRG is in the latter stages of developing a standard test protocol for the study of algal growth on painted surfaces. Like the current version of BS3900 Part G6, it is a panel test and is intended to help predict the performance of materials in use through the use of a standardised laboratory procedure. The method has been proposed for inclusion in the latest revision of BS3900 Part G6.


The group is also active in other areas such as the review of ISO 846 and has an interest in developing approaches for materials such as wood-plastic composites. In previous years, IBRG produced the ground work and provided the international ring test data for the 1997 revision of ISO 846 as well as a number of methods associated with biodegradable plastics. This lead to improved definitions and work was performed to provide the data in support of ISO 14851 and ISO 14852.

To help measure the efficacy of biocides used to protect plastics from spoilage and degradation by fungi, the group developed a thin agar overlay method for measuring fungistatic activity. After a series of ring tests, this was published as ISO 16869. It is likely that the group will return to this application in the near future to provide methods that reflect normal usage of plastics, possibly in association with work on wood-plastic composites.


Further Details:

Further details of the work of the IBRG Dry-State Preservation Group can be obtained from the General Secretary of IBRG who is also the Secretary of the IBRG Paints Working Group:-
Pete Askew, IMSL, Pale Lane, Hartley Wintney Hampshire, RG27 8DH
Telephone: +44 (0)1252 627676
Telefax: +44 (0)1252 627678
E-mail: <click-here>


  • £100.00
    Determining the Resistance of Paints and Coatings to Algal Growth
    This document describes a method to determine the resistance of paints and coatings to the growth of photosynthetic microorganisms and the effectiveness of biocides (preservatives) that might be used in them. Samples are inoculated with defined suspensions of microorganisms and then incubated. The changes in the size of the populations both over time and in treated compared with untreated materials are used to describe the basic antimicrobial properties of the materials. The results obtained may not describe the performance of the treated materials under normal conditions of use.
    IBRG DSP19-004
    • Peter Askew 2014 Efficacy Assessment of Treated Articles - A guidance Nordic Council
    • Lunenberg-Duindam J, Lindner W 2000 In-can Preservation of Emulsion Paints European Coatings Journal 03 66-73 Vincentz
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