1、Designation: C 550 03Standard Test Method forMeasuring Trueness and Squareness of Rigid Block andBoard Thermal Insulation1This standard is issued under the fixed designation C 550; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, th
2、e year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript 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. Scope1.1 This test method covers lo
3、cations 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 the standard. The
4、values given in parentheses are forinformation only.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 establish appro-priate safety and health practices and determine the applica-bility of
5、 regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:C 168 Terminology Relating to Thermal Insulation2C 390 Criteria for Sampling and Acceptance of PreformedThermal Insulation Lots23. Terminology3.1 DefinitionsFor definitions of terms used in this testmethod, refer to Termi
6、nology C 168.3.2 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 boards that are not true or squaremay not fit properly. Extra labo
7、r 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 of truenessand squareness of blocks and boards.5. Apparatus5.1 Str
8、aightedge, 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 as long as the longestside of the block. If the longest side of th
9、e 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 orboard in its full length and width dimensions, with a truenessof 60.0
10、08 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 specimens shall be of commercial size.6.2 The number of test specim
11、ens shall be defined by theappropriate product specification.6.3 When the appropriate product specification does notcover sampling, samples shall be selected in accordance withCriteria C 390 inspection requirements.7. Procedure7.1 Edge Trueness in the x/y Direction:7.1.1 With the straightedge next t
12、o 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 For convex deviation from true, the deviation shall bemeasured by equalizing the distance between the straightedgeand the block/board at both corners of t
13、he 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).1This test method is under the jurisdiction of ASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.32 on MechanicalProperties.Current edition appr
14、oved April 10, 2003. Published June 2003. Originallypublished in 1964. Last previous edition C 550 95 (2001).2Annual Book of ASTM Standards, Vol 04.06.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.2 Edge Trueness in the z (Thickn
15、ess) 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
16、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. 2A.7.3.2 Wi
17、th 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 devi
18、ation 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, place the block
19、/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 flatsurface with t
20、he 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 Trueness:8.2.1
21、Maximum deviation from edge 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 squarenes
22、s in inches(or millimetres).8.3.2 Maximum deviation from corner squareness in inches(or millimetres).8.4 Face Trueness: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 TruenessC5500328
23、.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 testmethod for measuring th
24、e 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 as these data are not
25、 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 determination of the
26、 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 reapproved or withdrawn. Your
27、 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 that your comments
28、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 reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).C550033
