ASTM C419-94
(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
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 the standard. The values given in parentheses are for information only.
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: C 419 – 94
Standard Practice for
Making and Curing Test Specimens of Mastic Thermal
Insulation Coatings
This standard is issued under the fixed designation C 419; 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.
1. Scope C 533 Specification for Calcium Silicate Block and Pipe
Thermal Insulation
1.1 This practice covers the preparation of specimens of
C 647 Guide to Properties and Tests of Mastics and Coating
mastics and coatings in the form of cured sheets or films that
Finishes for Thermal Insulation
may be used in other procedures for evaluation of physical
D 6 Test Method for Loss on Heating of Oil and Asphaltic
properties.
Compounds
1.2 Three procedures are described for casting and curing
(Note 1) mastics and coatings of all types for thermal insula-
3. Summary of Practice
tion.
3.1 Mastics and coatings are applied by a metal blade to
NOTE 1—The term “cure” is used primarily to denote the condition that
thermal insulation backing material in a thickness regulated by
develops as the result of loss of volatile matter but also to denote possible
guide bars. Moderate heat is applied to the specimens to dry or
subsequent changes in chemical or physical properties due to crosslinking.
otherwise cure them.
1.2.1 Procedure A is intended to provide a specimen of
4. Significance and Use
controlled thickness applied to insulation, and equivalent in
other respects to that obtainable under field application condi-
4.1 The method of preparation of test specimens of mastic
tions. The thermal insulation intended for field use may be
thermal insulation coatings can have an impact upon values
specified as the backing.
obtained during testing. Testing laboratories should follow this
1.2.2 Procedure B is intended to provide a free-film speci-
practice to help ensure the reproducibility of test methods for
men of controlled thickness having smooth surfaces on both
which a cured sheet or film of a mastic thermal insulation
sides. This type is required for some types of physical testing.
coating is required.
1.2.3 Procedure C is intended to provide a free-film speci-
5. Apparatus
men of controlled thickness having one smooth surface (as
field applied).
5.1 Guide Bars—Two rectangular steel bars of thickness
1.3 The procedures of this practice are not intended for the
equal to the desired wet thickness of the applied mastic or
evaluation of application properties. These are covered in Test
coating. The guide bars shall be equal in length to the total
Methods C 461 and Guide C 647.
length of the specimens. For use on relatively soft backing
1.4 The values stated in inch-pound units are to be regarded
material, the guide bars may be equipped with pins projecting
as the standard. The values given in parentheses are for
from the lower surface at each end, which can be forced into
information only.
the backing to hold the bars in position during preparation of
1.5 This standard does not purport to address all of the
the test specimen.
safety concerns, if any, associated with its use. It is the
5.2 Strike-Off Bar—A flat strip of rigid metal, not less than
responsibility of the user of this standard to establish appro-
2 in. (51 mm) greater in length than the width of the specimen.
priate safety and health practices and determine the applica-
One edge shall be smooth and straight.
bility of regulatory limitations prior to use.
5.3 Leveling Roller—One section of straight 1 ⁄2-in. (38-
mm) stainless steel pipe or any other convenient cylindrical
2. Referenced Documents
leveling tool. The tool shall have a smooth surface. Minimum
2.1 ASTM Standards:
length shall be 2 in. (51 mm) longer than the width of the
C 461 Test Methods for Mastics and Coatings
specimen.
5.4 Backing Material—Unless otherwise specified by the
procedure for the test to be made, the backing for the specimen
This practice is under the jurisdiction of ASTM Committee C-16 on Thermal
shall consist of commercial block-type calcium silicate insula-
Insulation and is the direct responsibility of Subcommittee C16.33 on Thermal
tion meeting the requirements of Specification C 533 and
Insulation Finishes and Vapor Transmission.
Current edition approved Dec. 15, 1994. Published February 1995. Originally
published as C 419 – 58 T. Last previous edition C 419 – 81 (1990).
2 3
Annual Book of ASTM Standards, Vol 04.06. Annual Book of ASTM Standards, Vol 04.04.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
C 419
measuring 2 by 18 by 24 in. (51 by 457 by 610 mm). The the mastic, in the following manner: Place a short edge of the
backing block may be prepared by assembling not more than coated paper at one end of the mastic-filled area and gradually
three blocks of smaller dimensions by the use of suitable roll the paper into the wet mastic, using the leveling roller.
adhesive or pins, in such a manner as to form a solid, rigid Take care to prevent formation of air pockets, or bubbles, under
block. the paper. When firmly in contact with the mastic, roll out the
5.5 Release Paper—A smooth, dense white paper coated on paper-covered mastic until its thickness matches that of the
one side with dextrin, or other water-soluble gum. Size should guide bars. Then remove the guide bars without disturbing the
be approximately the same as the backing block. thickness of the specimen or the position of the paper. A
convenient method for accomplishing this is to slit the paper
NOTE 2—Films coated with PTFE or other suitable nonsoluble release
with a sharp blade along the inside length of the guide bars.
agent may be used as an acceptable alternative.
6.6 Procedure C (Free Film)—For the determination of
6. Preparation of Test Specimens
degree of cure as described in 7.1.2, prepare one extra
specimen in addition to the number required by the other
6.1 Stir the mastic or coating until uniform throughout the
procedures in which they are to be used. Place a sheet of the
container before removing the sample for specimen prepara-
release paper on the backing block so that the coated surface of
tion.
the paper faces upward, away from the backing block. Place
6.2 Determine the percent volatile matter by weight in
guide bars of thickness equal to the desired wet mastic
accordance with Test Methods C 461, for use in calculating the
thickness on the release paper along each of the long edges. Fill
degree of cure in 7.1.2.
the area between the guide bars with mastic and smooth out
6.3 Unless otherwise specified, lay down films to a nominal
with a trowel to a level about 0.063 in. (1.6 mm) above the
wet thickness of 0.125 in. (3.2 mm).
guide bars. Place the strike-off bar upon the guide bars at one
6.4 Procedure A (Adhered Film)—For the determination of
end of the filled area and move it slowly to the other end of the
degree of cure as described in 7.1.2, pr
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