Designation: D 1005 – 95 (Reapproved 2001)
Standard Test Method for
Measurement of Dry-Film Thickness of Organic Coatings Using Micrometers1
This standard is issued under the ﬁxed designation D 1005; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year oflast reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense.
1. Scope 1.1 This test method covers the measurement of ﬁlm thickness of dried ﬁlms of paint, varnish, lacquer, and related products using micrometers. Procedures A and B utilize stationary micrometersand Procedures C and D, hand-held micrometers. Procedures A and C are not recommended for ﬁlms less than 12.5 µm ( 0.5 mils) in thickness. The minimum thickness required for Procedures B and D is a function of that required to enable removal of the sample as a free ﬁlm. 1.2 The procedures appear as follows: 1.2.1 Procedure A—Stationary micrometer for measuring coatings applied to plane rigidsurfaces. 1.2.2 Procedure B—Stationary micrometer for measuring free ﬁlms. 1.2.3 Procedure C—Hand-held micrometer for measuring coatings applied to plane rigid surfaces. 1.2.4 Procedure D—Hand-held micrometer for measuring free ﬁlms. 1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.4 This standard does not purport to addressthe 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. 2. Referenced Documents 2.1 ASTM Standards: D 823 Practices for Producing Films of Uniform Thickness of Paint, Varnish, and Related Products on Test Panels2 D 2370Test Method for Tensile Properties of Organic Coatings2 3. Signiﬁcance and Use 3.1 This test method is particularly applicable to the measurement of free ﬁlms and is also satisfactory for the measure1 This test method is under the jurisdiction of ASTM Committee D01 on Paint and Related Coatings, Materials, and Applications and is the direct responsibility of Subcommittee D01.23 on PhysicalProperties of Applied Paint Films. Current edition approved Feb. 15, 1995. Published April 1995. Originally published 1949. Last previous edition D 1005 – 84 (1990)e1. 2 Annual Book of ASTM Standards, Vol 06.01.
ment of ﬁlms on laboratory test panels. 3.2 The accuracy and precision of the thickness measurements may be inﬂuenced by the deformability of the coating. This test method is not applicable tocoatings that are readily deformable under the load of the measuring instrument. 3.3 The accuracy and precision of the thickness measurements are also inﬂuenced by the uniformity of the substrate when the coatings are applied to laboratory test panels. 4. Apparatus 4.1 Procedures A and B: 4.1.1 The apparatus shall consist of a dial comparator, dial indicator, or micrometer. A rigid base is requiredfor mounting the dial comparator or dial indicator gages. The presser foot of the micrometer or dial indicator shall be circular, from 1.5 to 3.0 mm (1⁄16 to 1⁄8 in.) in diameter, and shall be ﬂat on the bottom. The presser foot shall be ﬁxed to an indicator that reads to 2.5 µm (0.1 mil). The load on the presser foot shall be between 140 and 275 kPa (20 and 40 psi ). For Procedure B, a smoothuncoated test plate is also required. 4.1.2 Verify the accuracy of instrument calibration by setting to zero with the anvils closed followed by measuring shims of known thicknesses or standards speciﬁcally designed for this purpose. Record the standard thickness gage measurement and the micrometer reading. Use these results to construct a calibration curve. 4.2 Procedures C and D—The apparatus...
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