ASTM C1815:17(R2021) pdf free download – Standard Practice for Periodically Measuring and Monitoring Sealant Dimensions to Stability Following a Period of Compression or Tension.
Note 1—The membeni of C24.20 were able to measure the dimensions of three different sealants to a precision of ±0.05 mm using a digital micrometer.
7. Procedure
7.1 Measure the dimensions of the specimen at the standard conditions of temperature and relative humidity defined in Terminology C717. Measurements of the specimen dimensions at other ambient temperature and relative humidity conditions may he performed hut should be reported in 8.1.4.
7.2 The test specimen shall be measured with a precision of ± 0.05 mm in all three dimensions (width, height. and thickness).
7.2.1 The jaws of the geometry measuring tool described in
6.1 will he positioned at the midpoint of the width, or thickness of the sample. The jaws of the geometry measuring tool will he closed until the jaws make contact with the sealant. At this point, the dimensions indicated by the geometry measuring tool are recorded.
7.2.2 For the measurement of the height of the sample, the jaws of the dimensional measuring tool described in 6.1 will he positioned between the substrates. The jaws of the dimensional measuring tool will be opened until the jaws make contact with the metal supports of the sealant when the dimensional measuring tool is vertically aligned with the height of the sealant. At this point, the dimension indicated by the dimensional measuring tool is recorded.
7.2.3 This procedure will be repeated at regular intervals until three subsequent readings are equivalent within ± 0.1 mm. Regular intervals would be determined to document how the sealant is changing.
8 Report
8.1 Report the following information:
8.1.1 Identification of the sealant measured, including type. source, manufacturer code number, and curing conditions employed.
8.1.2 Identification of the substrates measured.
8.1.3 Name and description of primers that were used, if any,
8.1.4 Temperature and relative humidity,
8.1.5 Number of specimens tested.
8.1.6 Description of the sealant appearance. and
8.1.7 Records in terms of dimensions as a function of tune.
9. Keywords
9.1 compression; dimensional stability; recovery; sealant; tension.