ASTM D2856-94(1998)
Standard Test Method for Open-Cell Content of Rigid Cellular Plastics by the Air Pycnometer

Standard No.

ASTM D2856-94(1998)

Release Date

1998

Published By

American Society for Testing and Materials (ASTM)

Status

Withdraw 2006-01

Latest

ASTM D2856-94(1998)

Scope

1.1 Cellular plastics are composed of the 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 volume occupied by closed cells is considered to include cell walls. Since any conveniently sized specimen can only be obtained by some cutting operation, a fraction of the closed cells will be opened during sample preparation and will be included as open cells. 1.2 This test method consists of three procedures: 1.2.1 Procedure A, designed to correct for cells opened during sample preparation, by measuring cell diameter, calculating, and allowing for surface volume; 1.2.2 Procedure B, designed to correct for cells opened in sample preparation, by cutting and exposing new surface area equal to the surface area of the original sample dimension, and 1.2.3 Procedure C, which does not correct for cells opened during sample preparation and gives good accuracy on predominantly highly open-celled materials. 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 information 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 and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Note 2, Note 4, and Note 8. NOTE 1—This test method and ISO 4590-1981 use the same basic principles but are significantly different in experimental detail.

ASTM D2856-94(1998) Referenced Document

• ASTM D3576 Standard Test Method for Cell Size of Rigid Cellular Plastics*， 1998-04-22 Update
• ASTM D618 Standard Practice for Conditioning Plastics for Testing*， 2021-07-15 Update
• ASTM D883 Standard Terminology Relating to Plastics*， 2024-02-01 Update
• ASTM E691 Standard Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method*， 1999-04-22 Update
• ISO 4590:1981 Cellular plastics; Determination of volume percentage of open and closed cells of rigid materials

ASTM D2856-94(1998) history

• 1998 ASTM D2856-94(1998) Standard Test Method for Open-Cell Content of Rigid Cellular Plastics by the Air Pycnometer