1、Designation: C550 03 (Reapproved 2009)Standard Test Method forMeasuring Trueness and Squareness of Rigid Block andBoard Thermal Insulation1This standard is issued under the fixed designation C550; the number immediately following the designation indicates the year oforiginal adoption or, in the case
2、 of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () 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. Scope1.1 This test m
3、ethod covers locations for measuring thetrueness and squareness of rigid block/board thermal insula-tion. This test method does not purport to address the variabil-ity in board thickness. Thickness is addressed in other ASTMstandards.1.2 The values stated in inch-pound units are to be regardedas sta
4、ndard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this s
5、tandard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2C168 Terminology Relating to Thermal InsulationC390 Practice for Sampling and Acceptance of ThermalInsulation Lots3. Termin
6、ology3.1 DefinitionsFor definitions of terms used in this testmethod, refer to Terminology C168.3.2 Definitions of Terms Specific to This Standard:3.2.1 squarenessthe lack of deviation from a right angle.3.2.2 truenessthe lack of deviation from straightness orflatness.4. Significance and Use4.1 Insu
7、lating blocks or boards that are not true or squaremay not fit properly. Extra labor may be required to obtainproper fit and may affect the product performance as well as theappearance of the finished installation.4.2 This test method provides terminology and describeslocations for obtaining consist
8、ent measurements of truenessand squareness of blocks and boards.5. Apparatus5.1 Straightedge, minimum length equal to the maximumdimension of the block or board with a maximum out oftrueness of 6 0.003 in./ft (60.25 mm/m).5.2 Rigid Ruler, graduated to 0.03 in. (1.0 mm) or finer.5.3 Square, shall hav
9、e sides at least as long as the longestside of the block. If the longest side of the block is greater than20 in. (500 mm), then the length of the square must be at least20 in. (500 mm). The maximum deviation from 90 shall be nomore than 63 min (60.9 mrad).5.4 Flat Surface, large enough to accommodat
10、e the block orboard in its full length and width dimensions, with a truenessof 60.008 in./ft (60.65 mm/m).5.5 Feeler Gage Set, from 0.001 to 0.020 in. (0.03 to 0.50mm).5.6 Tape Measure, steel, long enough to measure the longestside of the block, graduated in 0.031 in. (1 mm) intervals.6. Test Specim
11、ens6.1 The test specimens shall be of commercial size.6.2 The number of test specimens shall be defined by theappropriate product specification.6.3 When the appropriate product specification does notcover sampling, samples shall be selected in accordance withPractice C390 inspection requirements.1Th
12、is test method is under the jurisdiction ofASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.32 on MechanicalProperties.Current edition approved Nov. 1, 2009. Published March 2010. Originallyapproved in 1964. Last previous edition approved in 2003 asC550 03
13、. DOI:10.1520/C0550-03R09.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100
14、Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7. Procedure7.1 Edge Trueness in the x/y Direction:7.1.1 With the straightedge next to the block/board on theflat surface, concave deviation from true shall be determined atthe point of maximum deviation (see Fig. 1 A an
15、d B).7.1.2 For convex deviation from true, the deviation shall bemeasured by equalizing the distance between the straightedgeand the block/board at both corners of the block/board (see Fig.1 A and B).7.1.3 Deviation from true shall be determined to the nearest0.03 in. (1.0 mm).7.2 Edge Trueness in t
16、he z (Thickness) Direction:7.2.1 With the square next to the block/board as shown inFig. 1C, the concave deviation from true shall be determined atthe point of maximum deviation.7.2.2 For convex deviation from true, the deviation shall bemeasured by equalizing the distance between the square andthe
17、block/board at both surfaces of the block/board as shown inFig. 1D.7.2.3 Deviation from true shall be determined to the nearest0.03 in. (0.8 mm).7.3 Edge Squareness:7.3.1 For edge squareness, the block/board shall be placedon the flat surface such that the deviation from square isapparent as in Fig.
18、 2A.7.3.2 With the square resting on the flat surface, determinethe deviation from square to the nearest 0.03 in. (1.0 mm) forall four edges at the point of maximum deviation.7.4 Corner Squareness:7.4.1 For corner squareness, the square shall be placedagainst the long edge as in Fig. 2B.7.4.2 Determ
19、ine the deviation from square for all fourcorners at 20 in. (500 mm) from the edge to the nearest 0.03 in.(1.0 mm). If the block/board is less than 20 in. (500 mm) inwidth, determine the deviation at full width and report thedeviation at full width.7.5 Face Trueness:7.5.1 For edge face trueness, pla
20、ce the block/board on theflat surface with the concave face down as in Fig. 3A.7.5.2 Without additional force or load to the block/board,determine the edge face trueness at the point of maximumdeviation to the nearest 0.03 in. (1.0 mm).7.5.3 For end face trueness, place the block/board on the flatsu
21、rface with the concave face down as in Fig. 3B.7.5.4 Determine end face trueness as in 7.5.2.8. Report8.1 Report the following information:8.1.1 Product type and nominal dimensions.8.1.2 Manufacturer and date of manufacture or lot number.8.1.3 Date of testing.8.1.4 Temperature during testing.8.2 Tru
22、eness:A. (Top View) B. (Top View)FIG. 1 Edge TruenessFIG. 1 Edge Trueness (continued)A. (Side View) B. (Top View)FIG. 2 SquarenessA. (Side View) B. (Side View)FIG. 3 Face TruenessC550 03 (2009)28.2.1 Maximum deviation from edge and end trueness ininches (or millimetres).8.2.2 Maximum deviation from
23、edge trueness across thewidth in inches (or millimetres).8.2.3 Maximum deviation from end trueness across thewidth in inches (or millimetres).8.3 Squareness:8.3.1 Maximum deviation from edge squareness in inches(or millimetres).8.3.2 Maximum deviation from corner squareness in inches(or millimetres)
24、.8.4 Face Trueness:8.4.1 Maximum deviation from flatness along the length ofthe block/board in inches (or millimetres).8.4.2 Maximum deviation from flatness across the width ofthe block/board in inches (or millimetres).9. Precision and Bias9.1 The precision and bias for the procedure in this testmet
25、hod for measuring the trueness and squareness of rigidblock thermal insulation are being determined.9.2 The precision of this test method is not known becauseinter-laboratory data are not available. This test method maynot be suitable for use in specifications or in case of disputedresults as long a
26、s these data are not available.10. Keywords10.1 flatness; rigid thermal insulation; squareness; truenessASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that
27、determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapprove
28、d or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel
29、 that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual repri
30、nts (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).C550 03 (2009)3
