ASTM C550-95

Standard Test Method for Measuring Trueness and Squareness of Rigid Block and Board Thermal Insulation

SCOPE
1.1 This test method covers locations for measuring the trueness and squareness of rigid block/board thermal insulation. This test method does not purport to address the variability in board thickness. Thickness is addressed in other ASTM standards.
1.2 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
1.3  This standard does not purport to address all of the 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.

General Information

• Status: Historical
• Publication Date: 31-Dec-1994
• Technical Committee: C16 - Thermal Insulation
• Drafting Committee: C16.32 - Mechanical Properties

Relations

• Replaced By: ASTM C550-95(2001) - Standard Test Method for Measuring Trueness and Squareness of Rigid Block and Board Thermal Insulation
• Effective Date: 01-Jan-1995
• Referred By: ASTM C578-22 - Standard Specification for Rigid, Cellular Polystyrene Thermal Insulation
• Effective Date: 01-Jan-1995
• Referred By: ASTM C1289-23 - Standard Specification for Faced Rigid Cellular Polyisocyanurate Thermal Insulation Board
• Effective Date: 01-Jan-1995
• Referred By: ASTM C591-22 - Standard Specification for Unfaced Preformed Rigid Cellular Polyisocyanurate Thermal Insulation
• Effective Date: 01-Jan-1995
• Referred By: ASTM C1126-19 - Standard Specification for Faced or Unfaced Rigid Cellular Phenolic Thermal Insulation
• Effective Date: 01-Jan-1995
• Referred By: ASTM E1730-19 - Standard Specification for Rigid Foam for Use in Structural Sandwich Panel Cores
• Effective Date: 01-Jan-1995

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: C 550 – 95
Standard Test Method for
Measuring Trueness and Squareness of Rigid Block and
Board Thermal Insulation
This standard is issued under the fixed designation C 550; 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 of last 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 and squareness of blocks and boards.
1.1 This test method covers locations for measuring the
5. Apparatus
trueness and squareness of rigid block/board thermal insula-
5.1 Straightedge, minimum length equal to the maximum
tion. This test method does not purport to address the variabil-
dimension of the block or board with a maximum out of
ity in board thickness. Thickness is addressed in other ASTM
trueness of 6 0.003 in./ft (60.25 mm/m).
standards.
5.2 Rigid Ruler, graduated to 0.03 in. (1.0 mm) or finer.
1.2 The values stated in inch-pound units are to be regarded
5.3 Square, shall have sides at least as long as the longest
as the standard. The values given in parentheses are for
side of the block. If the longest side of the block is greater than
information only.
20 in. (500 mm), then the length of the square must be at least
1.3 This standard does not purport to address all of the
20 in. (500 mm). The maximum deviation from 90° shall be no
safety concerns, if any, associated with its use. It is the
more than 63 min (60.9 mrad).
responsibility of the user of this standard to establish appro-
5.4 Flat Surface, large enough to accommodate the block or
priate safety and health practices and determine the applica-
board in its full length and width dimensions, with a trueness
bility of regulatory limitations prior to use.
of 60.003 in./ft (60.25 mm/m).
2. Referenced Documents 5.5 Feeler Gage Set, from 0.001 to 0.020 in. (0.03 to 0.50
mm).
2.1 ASTM Standards:
5.6 Tape Measure, steel, long enough to measure the longest
C 168 Terminology Relating to Thermal Insulating Materi-
side of the block, graduated in 0.031 in. (1 mm) intervals.
als
C 390 Criteria for Sampling and Acceptance of Preformed
6. Test Specimens
Thermal Insulation Lots
6.1 The test specimens shall be of commercial size.
3. Terminology 6.2 The number of test specimens shall be defined by the
appropriate product specification.
3.1 Definitions—For definitions of terms used in this test
6.3 When the appropriate product specification does not
method, refer to Terminology C 168.
cover sampling, samples shall be selected in accordance with
3.2 Definitions of Terms Specific to This Standard:
Criteria C 390 inspection requirements.
3.2.1 squareness—the lack of deviation from a right angle.
3.2.2 trueness—the lack of deviation from straightness or
7. Procedure
flatness.
7.1 Edge Trueness:
4. Significance and Use 7.1.1 With the straightedge next to the block/board on the
flat surface, concave deviation from true shall be determined at
4.1 Insulating blocks or boards that are not true or square
the point of maximum deviation (see Fig. 1A and B).
may not fit properly. Extra labor may be required to obtain
7.1.2 For convex deviation from true, the deviation shall be
proper fit and may affect the product performance as well as the
measured by equalizing the distance between the straightedge
appearance of the finished installation.
and the block/board at both corners of the block/board (see Fig.
4.2 This test method provides terminology and describes
1A and B).
locations for obtaining consistent measurements of trueness
7.1.3 Deviation from true shall be determined to the nearest
0.03 in. (1.0 mm).
This test method is under the jurisdiction of ASTM Committee C-16 on
7.2 Edge Squareness:
Thermal Insulation and is the direct responsibility of Subcommittee C16.32 on
Mechanical Properties. 7.2.1 For edge squareness, the block/board shall be placed
Current edition approved Jan. 15, 1995. Published March 1995. Ori
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