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    ASTM D6226 - 21

    Standard Test Method for Open Cell Content of Rigid Cellular Plastics

    Active Standard ASTM D6226 | Developed by Subcommittee: D20.22

    Book of Standards Volume: 08.03


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    Significance and Use

    5.1 This test method is intended to be used in specifications where porosity of cellular plastics has a direct bearing on their end use. For example, for thermal insulation applications, a high percentage of closed cells is necessary to prevent escape of gases and to promote low thermal conductivity. In flotation applications, high closed-cell content generally reduces water absorption.

    5.2 Before proceeding with this test method, reference shall be made to the specification of the material being tested. Any test specimen preparation, conditioning, or dimensions, or both, and testing parameters covered in the materials specification shall take precedence over those mentioned in this test method. If there are no material specifications, then the default conditions apply.

    1. Scope

    1.1 This test method covers cellular plastics, which are composed of membranes or walls of polymer separating small cavities or cells. These cells may be interconnecting (open cell), non-connecting (closed cell), or any combination of these types. This test method determines numerical values for open cells. It is a porosity determination, measuring the accessible cellular volume of a material. The remaining volume is that occupied by closed cells and cell walls. Since any conveniently sized specimen is typically obtained by some cutting operation, a fraction of the closed cells will be opened by specimen preparation and will be included as open cells, (see Note 2).

    1.2 This test method provides good accuracy on predominantly highly open-celled materials. By not accounting for closed cells that were opened during specimen preparation, the accuracy decreases as the closed cell content increases and as the cell size increases.

    1.3 The values as stated in SI units are to be regarded as the standard. The values in parentheses are given for reference only.

    1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

    Note 1: This test method and ISO 4590 use the same basic principles but are significantly different in experimental detail.

    Note 2: Two procedures for correcting for cells opened during specimen preparation are described in Appendix X1.1.

    1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ISO Standard

    ISO 4590

    ASTM Standards

    D883 Terminology Relating to Plastics

    D2842 Test Method for Water Absorption of Rigid Cellular Plastics

    D3576 Test Method for Cell Size of Rigid Cellular Plastics

    E456 Terminology Relating to Quality and Statistics

    E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method


    ICS Code

    ICS Number Code 83.080.01 (Plastics in general)

    UNSPSC Code

    UNSPSC Code 13111065(Cellulosic resins)


    Referencing This Standard
    Link Here
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    DOI: 10.1520/D6226-21

    Citation Format

    ASTM D6226-21, Standard Test Method for Open Cell Content of Rigid Cellular Plastics, ASTM International, West Conshohocken, PA, 2021, www.astm.org

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