1、Designation: C550 10Standard 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 of revision, the
2、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 method covers locat
3、ions 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 standard. The values
4、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 standard to establi
5、sh 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. Terminology3.1 Definitio
6、nsFor 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 Insulating blocks or b
7、oards 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 consistent measurements o
8、f 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 have sides at least a
9、s 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 accommodate the block orboar
10、d 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 Specimens6.1 The test sp
11、ecimens 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.1This test method is
12、under the jurisdiction ofASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.32 on MechanicalProperties.Current edition approved May 1, 2010. Published June 2010. Originallyapproved in 1964. Last previous edition approved in 2009 as C550 03(2009).DOI: 10.1520
13、/C0550-03R10.2For 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 Barr Harbor D
14、rive, 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 and B).7.1.2 Fo
15、r 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 the z (Thickne
16、ss) 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 block/board a
17、t 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. 2A.7.3.2 Wit
18、h 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 Determine the devia
19、tion 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 Board Squareness:7.5.1 For board squareness, the block/board
20、 shall be placedon a flat surface and the diagonal lengths shall be measured tothe nearest 0.03 in. (1.0 mm) as in Fig. 2C.7.5.2 the block/board squareness is the difference betweenthe lengths of the diagonals.7.6 Face Trueness:7.6.1 For edge face trueness, place the block/board on theflat surface w
21、ith the concave face down as in Fig. 3A.7.6.2 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).7.6.3 For end face trueness, place the block/board on the flatsurface with the concave face down as in
22、Fig. 3B.7.6.4 Determine end face trueness as in 7.6.2.8. 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 Trueness:8.2.1 Maximum deviation from edge
23、 and end trueness ininches (or millimetres).8.2.2 Maximum deviation from 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)
24、.8.3.2 Maximum deviation from corner squareness in inches(or millimetres).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).A. (Top
25、View) B. (Top View)FIG. 1 Edge TruenessFIG. 1 Edge Trueness (continued)C550 1029. Precision and Bias9.1 The precision and bias for the procedure in this testmethod for measuring the trueness and squareness of rigidblock thermal insulation are being determined.9.2 The precision of this test method is
26、 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 as these data are not available.10. Keywords10.1 flatness; rigid thermal insulation; squareness; truenessASTM International takes no position
27、 respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.T
28、his standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM In
29、ternational Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address show
30、n below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-
31、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/).A. (Side View) B. (Top View) C. (Top View)FIG. 2 SquarenessA. (Side View) B. (Side View)FIG. 3 Face TruenessC550 103
