1、Designation: C550 15Standard 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 U.S. Department of Defense.1. Scope1.1 This test method covers
3、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 standard. The va
4、lues 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 es
5、tablish 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 LotsE177 Practice for Use
6、of the Terms Precision and Bias inASTM Test Methods3. Terminology3.1 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
7、from straightness orflatness.4. Significance and Use4.1 It is possible that insulating blocks or boards that are nottrue or square will not fit properly. It is possible that extra laborwill be required to obtain proper fit and that this could affectthe product performance as well as the appearance o
8、f thefinished installation.4.2 This test method provides terminology and describeslocations for obtaining consistent 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 oftruen
9、ess 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 the block is greater than20 in. (500 mm), then the length of the square must be at least20 in. (500 mm). T
10、he 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 60.008 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, s
11、teel, 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 specimens shall be defined by theappropriate product specification.6.3 When the appropriate product specificat
12、ion does notcover sampling, samples shall be selected in accordance withPractice C390 inspection requirements.7. Procedure7.1 Edge Trueness in the x/y Direction:1This test method is under the jurisdiction ofASTM Committee C16 on ThermalInsulation and is the direct responsibility of Subcommittee C16.
13、32 on MechanicalProperties.Current edition approved Oct. 15, 2015. Published December 2015. Originallyapproved in 1964. Last previous edition approved in 2010 as C550 10. DOI:10.1520/C0550-15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at ser
14、viceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States17.1.1 With the straightedge next to the block/board on
15、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 the block/board (see F
16、ig.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 (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 Fo
17、r convex deviation from true, the deviation shall bemeasured by equalizing the distance between the square andthe 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 square
18、ness, the block/board shall be placedon the flat surface such that the deviation from square isapparent as in Fig. 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
19、Squareness:7.4.1 For corner squareness, the square shall be placedagainst the long edge as in Fig. 2B.7.4.2 Determine 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
20、 deviation at full width and report thedeviation at full width.7.5 Board Squareness:7.5.1 For board squareness, the block/board 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
21、 betweenthe lengths of the diagonals.7.6 Face Trueness:7.6.1 For edge face trueness, place the block/board on theflat surface with 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 ne
22、arest 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 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
23、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 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 a
24、cross 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).8.4 Face Trueness:8.4.1 Maximum deviation from flatness along the length ofthe block/board in inche
25、s (or millimetres).A. (Top View) B. (Top View)FIG. 1 Edge TruenessFIG. 1 Edge Trueness (continued)C550 1528.4.2 Maximum deviation from flatness across the width ofthe block/board in inches (or millimetres).9. Precision and Bias9.1 The precision of this test method is based on aninterlaboratory study
26、 of Test Method C550, Standard TestMethod for Measuring Trueness and Squareness of RigidBlock and Board Thermal Insulation, conducted in 2011. Atotal of seven laboratories participated in this study, taking 30distinct measurements on five different sections of preparedthermal insulation. Each “test
27、result” reported represents anindividual determination, and all participants were asked toreport triplicate test results for each measurement. The detailsare given in ASTM Research Report No. C161044.39.1.1 Repeatability Limit (r)Two test results obtainedwithin one laboratory shall be judged not equ
28、ivalent if theydiffer by more than the “r” value for that material; “r”istheinterval representing the critical difference between two testresults for the same material, obtained by the same operatorusing the same equipment on the same day in the samelaboratory.9.1.1.1 Repeatability limits are listed
29、 in Table 1 below.9.1.2 Reproducibility Limit (R)Two test results shall bejudged not equivalent if they differ by more than the “R” valuefor that material; “R” is the interval representing the criticaldifference between two test results for the same material,obtained by different operators using dif
30、ferent equipment indifferent laboratories.9.1.2.1 Reproducibility limits are listed in Table 1 below.9.1.3 The above terms (repeatability limit and reproducibil-ity limit) are used as specified in Practice E177.9.1.4 Any judgment made in accordance with statements9.1.1 and 9.1.2 would have an approx
31、imate 95 % probability ofbeing correct.9.2 BiasAs there were no available standard referencematerials at the time of this study, bias cannot be determined.9.3 The precision statement was determined through statis-tical examination of 2518 test measurements, submitted by atotal of seven laboratories,
32、 recording deviation measurementson five insulation boards.9.4 To judge the equivalency of two test results, it isrecommended to choose the board that is closest in character-istics to the test material.10. Keywords10.1 flatness; rigid thermal insulation; squareness; trueness3Supporting data have be
33、en filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:C16-1044. ContactASTM CustomerService at serviceastm.org.A. (Side View) B. (Top View) C. (Top View)FIG. 2 SquarenessA. (Side View) B. (Side View)FIG. 3 Face TruenessC550 153ASTM International takes no pos
34、ition 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 responsibil
35、ity.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 comments are invited either for revision of this standard or for additional standardsand should be addressed to AS
36、TM 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 have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address
37、 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
38、-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 Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 1 Precision DataFigureDesignationDeviation M
39、aterial Board DeviationTypeAverageDeviation,inchXRepeatabilityStandardDeviationSrReproducibilityStandardDeviationSRRepeatabilityLimitrReproducibilityLimitRFig. 1 A EdgeTruenessLengthDirectionEPS B Convex 0.2293 0.0095 0.0260 0.0267 0.0727Fig. 1 A EdgeTruenessLengthDirectionEPS B Concave 0.2051 0.005
40、9 0.0274 0.0166 0.0768Fig. 1 B EdgeTruenessWidthDirectionEPS C Concave 0.1104 0.0063 0.0297 0.0176 0.0831Fig. 1 B EdgeTruenessWidthDirectionEPS C Convex 0.1208 0.0180 0.0468 0.0504 0.1310Fig. 1 C EdgeSquarenessEPS B Concave 0.1116 0.0048 0.0617 0.0133 0.1727Fig. 1 D EdgeSquarenessEPS B Convex 0.0933
41、 0.0002 0.0304 0.0007 0.0851Fig. 2 B CornerSquarenessEPS D Corner 1A0.2981 0.0147 0.0543 0.0412 0.1520Fig. 2 B CornerSquarenessEPS D Corner 2A0.2483 0.0073 0.0314 0.0205 0.0878Fig. 2 C BoardSquarenessEPS D Diagonal 0.4474 0.0104 0.0230 0.0291 0.0644Fig. 3 B End FaceTruenessEPS E End 1B0.1533 0.0073 0.0249 0.0205 0.0696Fig. 3 B End FaceTruenessEPS E End 2B0.1565 0.0119 0.0229 0.0333 0.0640ADiagonal corners.BOpposite ends.C550 154
