The temperature range may be extended depending on the instrumentation and calibration materials used.ġ.5 The precision of measurement of this absolute method (better than 40 nm/(mK)) is significantly higher than that of comparative methods such as push rod dilatometry (for example, Test Methods D 696 and E 228) and thermomechanical analysis (for example, Test Method E 831) techniques. Since a general method of test cannot cover all specific requirements, details of this nature should be discussed in the particular material specifications.ġ.4 This test method is applicable to the approximate temperature range 150 to 700C. 1.1 This test method covers the determination of linear thermal expansion of rigid solids using either a Michelson or Fizeau interferometer.ġ.2 For this purpose, a rigid solid is defined as a material which, at test temperature and under the stresses imposed by instrumentation, has a negligible creep, insofar as significantly affecting the precision of thermal length change measurements.ġ.3 It is recognized that many rigid solids require detailed preconditioning and specific thermal test schedules for correct evaluation of linear thermal expansion behavior for certain material applications.
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