ASTM C419-08(2013)
(Practice)Standard Practice for Making and Curing Test Specimens of Mastic Thermal Insulation Coatings
Standard Practice for Making and Curing Test Specimens of Mastic Thermal Insulation Coatings
SIGNIFICANCE AND USE
5.1 The method of preparation of test specimens of mastic thermal insulation coatings can have an impact upon values obtained during testing. Testing laboratories should follow this practice to help ensure the reproducibility of test methods for which a cured sheet or film of a mastic thermal insulation coating is required.
SCOPE
1.1 This practice covers the preparation of specimens of mastics and coatings in the form of cured sheets or films that may be used in other procedures for evaluation of physical properties.
1.2 Three procedures are described for casting and curing (Note 1) mastics and coatings of all types for thermal insulation. Note 1—The term “cure” is used primarily to denote the condition that develops as the result of loss of volatile matter but also to denote possible subsequent changes in chemical or physical properties due to crosslinking.
1.2.1 Procedure A is intended to provide a specimen of controlled thickness applied to insulation, and equivalent in other respects to that obtainable under field application conditions. The thermal insulation intended for field use may be specified as the backing.
1.2.2 Procedure B is intended to provide a free-film specimen of controlled thickness having smooth surfaces on both sides. This type is required for some types of physical testing.
1.2.3 Procedure C is intended to provide a free-film specimen of controlled thickness having one smooth surface (as field applied).
1.3 The procedures of this practice are not intended for the evaluation of application properties. These are covered in Test Methods C461 and Guide C647.
1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.5 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.
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Designation: C419 − 08 (Reapproved 2013)
Standard Practice for
Making and Curing Test Specimens of Mastic Thermal
Insulation Coatings
This standard is issued under the fixed designation C419; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2. Referenced Documents
1.1 This practice covers the preparation of specimens of 2.1 ASTM Standards:
mastics and coatings in the form of cured sheets or films that C168 Terminology Relating to Thermal Insulation
may be used in other procedures for evaluation of physical C461 Test Methods for Mastics and Coatings Used With
properties. Thermal Insulation
C533 Specification for Calcium Silicate Block and Pipe
1.2 Three procedures are described for casting and curing
Thermal Insulation
(Note 1) mastics and coatings of all types for thermal insula-
C647 Guide to Properties and Tests of Mastics and Coating
tion.
Finishes for Thermal Insulation
NOTE 1—The term “cure” is used primarily to denote the condition that
D6/D6M Test Method for Loss on Heating of Oil and
develops as the result of loss of volatile matter but also to denote possible
Asphaltic Compounds
subsequentchangesinchemicalorphysicalpropertiesduetocrosslinking.
1.2.1 Procedure A is intended to provide a specimen of
3. Terminology
controlled thickness applied to insulation, and equivalent in
3.1 Definitions—For definitions used in this practice see
other respects to that obtainable under field application condi-
Terminology C168.
tions. The thermal insulation intended for field use may be
specified as the backing.
4. Summary of Practice
1.2.2 Procedure B is intended to provide a free-film speci-
4.1 Mastics and coatings are applied by a metal blade to
men of controlled thickness having smooth surfaces on both
thermal insulation backing material in a thickness regulated by
sides. This type is required for some types of physical testing.
guide bars. Moderate heat is applied to the specimens to dry or
1.2.3 Procedure C is intended to provide a free-film speci-
otherwise cure them.
men of controlled thickness having one smooth surface (as
field applied).
5. Significance and Use
1.3 The procedures of this practice are not intended for the
5.1 The method of preparation of test specimens of mastic
evaluation of application properties. These are covered in Test
thermal insulation coatings can have an impact upon values
Methods C461 and Guide C647.
obtained during testing. Testing laboratories should follow this
1.4 The values stated in inch-pound units are to be regarded
practice to help ensure the reproducibility of test methods for
as standard. The values given in parentheses are mathematical
which a cured sheet or film of a mastic thermal insulation
conversions to SI units that are provided for information only
coating is required.
and are not considered standard.
1.5 This standard does not purport to address all of the
6. Apparatus
safety concerns, if any, associated with its use. It is the
6.1 Guide Bars—Two rectangular steel bars of thickness
responsibility of the user of this standard to establish appro-
equal to the desired wet thickness of the applied mastic or
priate safety and health practices and determine the applica-
coating. The guide bars shall be equal in length to the total
bility of regulatory limitations prior to use.
length of the specimens. For use on relatively soft backing
material, the guide bars may be equipped with pins projecting
This practice is under the jurisdiction of ASTM Committee C16 on Thermal
Insulation and is the direct responsibility of Subcommittee C16.33 on Insulation
Finishes and Moisture. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Nov. 1, 2013. Published March 2014. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1958. Last previous edition approved in 2008 as C419 – 08. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C0419-08R13. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C419 − 08 (2013)
from the lower surface at each end, which can be forced into end to end of the specimen covers the entire space between the
the backing to hold the bars in position during preparation of guide bars. Remove the guide bars without disturbing the wet
the test specimen. specimen.
6.2 Strike-Off Bar—A flat strip of rigid metal, not less than 7.5 Procedure B (Free Film)—For the determination of
2 in. (51 mm) greater in length than the width of the specimen. degree of cure as described in 8.1.2, prepare one extra
One edge shall be smooth and straight. specimen in addition to the number required by the other
procedures in which they are to be used. Place a sheet of the
6.3 Leveling Roller—One section of straight 1 ⁄2-in. (38-
release paper on the backing block so that the coated surface of
mm) stainless steel pipe or any other convenient cylindrical
the paper faces upward, away from the backing block. Place
leveling tool. The tool shall have a smooth surface. Minimum
and secure guide bars of thickness equal to the desired wet
length shall be 2 in. (51 mm) longer than the width of the
mastic thickness on the release paper along each of the long
specimen.
edges. Fill the area between the guide bars with mastic and
6.4 Backing Material—Unless otherwise specified by the
smooth out with a trowel to a level about 0.063 in. (1.6 mm)
procedure for the test to be made, the backing for the specimen
above the guide bars. Place on the freshly applied mastic
shall consist of commercial block-type calcium silicate insula-
another sheet of release paper with the coated surface facing
tion meeting the requirements of Specification C533 and
the mastic, in the following manner: Place a short edge of the
measuring 2 by 18 by 24 in. (51 by 457 by 610 mm). The
coated paper at one end of the mastic-filled area and gradually
backing block may be prepared by assembling not more than
roll the paper into the wet mastic, using the leveling roller.
three blocks of smaller dimensions by the use of suitable
Takecaretopreventformationofairpockets,orbubbles,under
adhesive or pins, in such a manner as to form a solid, rigid
the paper. When firmly in contact with the mastic, roll out the
block.
paper-covered mastic until its thickness matches that of the
guide bars. Then remove the guide bars without disturbing the
6.5 Release Paper—Asmooth, dense white paper coated on
thickness of the specimen or the position of the paper. A
one side with dextrin, or other water-soluble gum. Size should
convenient method for accomplishing this is to slit the paper
be approximately the same as the backing block.
with a sharp blade along the inside length of the guide bars.
NOTE 2—Films coated with PTFE or other suitable nonsoluble release
7.6 Procedure C (Free Film)—For the determination of
agent may be used as an acceptable alternative.
degree of cure as described in 8.1.2, prepare one extra
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