ASTM C631-09(2014)
(Specification)Standard Specification for Bonding Compounds for Interior Gypsum Plastering
Standard Specification for Bonding Compounds for Interior Gypsum Plastering
ABSTRACT
This specification covers the minimum requirements for bonding compounds used in adhering interior gypsum plasters to structurally sound surfaces. The bonding compound should be a tinted film-forming material suitable for application by brush, roller, and spray. It shall have a non-oxidizing, non-toxic, and non-flammable composition, and have a smooth, homogeneous, and flexible consistency with no settling of the solids. It shall also be free of foreign matter, and shall not be noticeably affected by mild acid or alkali. The apparatus needed for the preparation of the compound are moist cabinet, forced drift type oven, freezer, balance, timing device, tamper, steel straight edge, metal-bladed spatula, paint brush, briquet testing machine, briquet molds, divider, and clips. Specimens shall be sampled, tested, and conform accordingly to the following performance requirements: bonding capability; degradation; high temperature stability; freeze-thaw stability, and bond strength.
SCOPE
1.1 This specification covers minimum requirements for bonding compounds for adhering interior gypsum plaster to structurally sound surfaces.
1.2 This specification also covers test methods for determining performance requirements and physical properties.
1.3 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.
1.4 The following safety hazards caveat pertains only to the test methods described in this specification: 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:C631 −09 (Reapproved 2014)
Standard Specification for
Bonding Compounds for Interior Gypsum Plastering
This standard is issued under the fixed designation C631; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Physical Properties
1.1 This specification covers minimum requirements for 4.1 General—The bonding compound shall be a film
bonding compounds for adhering interior gypsum plaster to forming, non-oxidizing, non-toxic, non-flammable composi-
structurally sound surfaces. tion suitable for application by brush, roller, and spray. The
compound shall be tinted to show, by visual inspection, where
1.2 Thisspecificationalsocoverstestmethodsfordetermin-
ithasbeenapplied.Thetintingmaterialshallnotshowthrough
ing performance requirements and physical properties.
the material being bonded. The surfaces to which bonding
1.3 The values stated in inch-pound units are to be regarded
compounds are applied shall be relatively smooth, clean, and
as standard. The values given in parentheses are mathematical
dry. Surface coatings shall be removed if their nature indicates
conversions to SI units that are provided for information only
an unsatisfactory condition. Surfaces shall be prepared in
and are not considered standard.
accordance with the manufacturer’s directions.
1.4 The following safety hazards caveat pertains only to the
4.2 Consistency—The bonding compound shall be of a
testmethodsdescribedinthisspecification: This standard does
homogeneous nature with no settling of the solids. The
not purport to address all of the safety concerns, if any,
compound shall be free of foreign matter, and when applied in
associated with its use. It is the responsibility of the user of this
accordance with the manufacturer’s directions, shall cover
standard to establish appropriate safety and health practices
evenly.
and determine the applicability of regulatory limitations prior
4.3 Film Characteristics—A dry film of the bonding com-
to use.
pound shall be uniform and smooth and shall remain flexible.
Thefilmshallnotbenoticeablyaffectedbymildacidoralkali.
2. Referenced Documents
2.1 ASTM Standards:
5. Performance Requirements
C11Terminology Relating to Gypsum and Related Building
5.1 Bonding Capability—A dry film of bonding compound
Materials and Systems
shall be capable of bonding gypsum plaster immediately after
C28/C28MSpecification for Gypsum Plasters
drying and 10 days after drying when tested as specified in
C472Test Methods for Physical Testing of Gypsum, Gyp-
Section 12.
sum Plasters and Gypsum Concrete
5.2 Degradation—Bonding compound that separates shall
C511Specification for Mixing Rooms, Moist Cabinets,
beabletobere-mixedtoauniformconsistencywhentestedas
Moist Rooms, and Water Storage Tanks Used in the
specified in Section 10.
Testing of Hydraulic Cements and Concretes
5.3 High Temperature Stability—The bond strength shall be
3. Terminology
not less than 20 psi (138 kPa) when tested as specified in
3.1 Definitions—For definitions relating to gypsum and Section 9.
related building materials and systems, see Terminology C11.
5.4 Freeze-Thaw Stability—The bond strength shall be not
less than 20 psi (138 kPa) when tested as specified in Section
11.
This specification is under the jurisdiction of ASTM Committee C11 on
GypsumandRelatedBuildingMaterialsandSystemsandisthedirectresponsibility
5.5 Bond Strength—Bond strength of a fresh sample or a
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and
30-day-oldsampleshallbenotlessthan20psi(138kPa)when
Related Products.
tested as specified in Section 12.
Current edition approved Sept. 1, 2014. Published October 2014. Originally
approved in 1988. Last previous edition approved in 2009 as C631–09. DOI:
6. Sampling
10.1520/C0631-09R14.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.1 Take a sample of not less than 1 kg from each shipment
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
or consignment for analysis and tests. Except in special cases,
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. take the sample from not less than three separate containers,
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C631−09 (2014)
chosen at random. In addition, take samples from containers moldsmeasuredatthepointofgreatestthicknessoneitherside
that appear to be nonrepresentative, and test separately. Imme- of the mold at the waist line, 1 in. (25.4 mm) with permissible
diately place the samples in airtight glass containers and variations of+0.004 in. (0.10 mm) and−0.002 in. (0.05 mm)
transport to the testing laboratory in these containers. Take for new molds and−0.02 in. (0.5 mm) for molds in use. The
precautions to reduce evaporation or drying to a minimum. inside faces at the waist line shall have a vertical slot 0.03 in.
Thoroughly mix the bonding compound in the container if (0.75 mm) wide by 0.06 in. (1.5 mm) deep to accept the
there is a tendency for liquid phase separation. divider. The briquet specimens shall conform to the dimen-
sional requirements shown in Fig. 2.
7. Apparatus
7.12 Divider—Sheet brass 0.02 in. (0.05 mm) thick, 1.1 in.
7.1 Moist Cabinet—Specification C511.
(27.8 mm) wide by 1 in. (25.4 mm) high.
7.2 Oven—A forced draft type oven, having a temperature
7.13 Clips for Briquet Testing Machine—The clips for
controlled at 140 6 5°F (60 6 3°C) for high temperature tests
holding the tension test specimen shall be in accordance with
and 100 6 5°F (38 6 3°C) for drying of the briquets.
Fig. 3.
7.3 Freezer—A freezer having a controlled temperature
of−10 6 2°F (-23 6 1°C).
8. Conditioning
7.4 Balance—Abalancecapableofweighingatleast2500g
8.1 Room Temperature and Humidity—Maintain the air
at a precision of 0.1 g.
temperature in the vicinity of the mixing and testing area,
7.5 Timing Device—Astandard clock or watch with second 70 6 5°F (21 6 3°C). Maintain the relative humidity
hand.
at50 62%.
7.6 Tamper—A tamper made up of a nonabsorptive,
8.2 Temperature of the Mixing Water—72 6 2°F
nonabrasive, non-brittle material and having a cross section of
(22 61°C).
⁄2in.by1in.(13by25mm)andapproximately5to6in.(130
to 150 mm) long. The tamping face shall be flat and at right
9. High Temperature Test
angles to the length of the tamper.
9.1 Significance and Use—This test method provides pro-
7.7 Straight Edge—A steel straight edge not less than 4 in.
cedures for evaluating the bond strength of adhesives after
(100mm)longandnotlessthan ⁄16in.(1.6mm)normorethan
being exposed to accelerated aging at high temperature.
⁄8 in. (3.2 mm) in thickness.
9.2 Specimen Preparation—Foreachtestspecimen,transfer
7.8 Spatula—Aspatulawithametalblade6in.(150mm)in
the bonding compound, taken from the sample obtained, into a
length and ⁄2 in. (13 mm) in width, with straight edges.
standard 1 pt (400 mL) glass container.
7.9 Paint Brush—Astandard1in.(25mm)widebrush,with
9.3 Procedure—Place the specimen in the oven for 30 days.
natural or synthetic bristles.
Remove the container, allow the compound to cool to room
7.10 Testing Machine—Any type that is of sufficient capac-
temperature, mix the compound to a uniform consistency, and
ity and that is capable of applying the load continuously and
test as specified in Section 12.
without shock at the rate of 0.05 in. (1.27 mm)/min, with
9.4 Test and Retests—Test six briquets and report the
provision for adjustment of the rate of loading.
average of the test results. If the result of any one of the six
7.11 Briquet Molds—The molds for making test specimens
tests varied more than 15% from the average, reject it and
shall be made of metal not attacked by the plaster mortar and
report the average of the other five tests. If the results from
shall have sufficient material in the sides to prevent spreading
more than two tests vary more than 15% from the average,
during molding. Gang molds, when used, shall be of the type
reject the series and retest.
shown in Fig. 1. The dimensions of the briquet molds shall
conform to the following requirements: width of mold, be- 9.5 Precision and Bias—The precision and bias of the High
tween inside faces, at waist line of the briquet, 1 in. (25.4 mm) TemperatureTest for determining bond strength after exposure
with permissible variations of 60.01 in. (0.25 mm) for molds to high temperature is essentially the same as specified in the
in use and 60.005 in. (0.13 mm) for new molds; thickness of test method for bond strength, 12.7.
FIG. 1 Briquet Gang Mold
C631−09 (2014)
10. Degradation Test
10.1 Significance and Use—This test method simulates the
effects of high temperature storage on the physical properties
of bonding compound.
10.2 Specimen Preparation—
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C631 − 09 C631 − 09 (Reapproved 2014)
Standard Specification for
Bonding Compounds for Interior Gypsum Plastering
This standard is issued under the fixed designation C631; 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*Scope
1.1 This specification covers minimum requirements for bonding compounds for adhering interior gypsum plaster to structurally
sound surfaces.
1.2 This specification also covers test methods for determining performance requirements and physical properties.
1.3 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.
1.4 The following safety hazards caveat pertains only to the test methods described in this specification: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.
2. Referenced Documents
2.1 ASTM Standards:
C11 Terminology Relating to Gypsum and Related Building Materials and Systems
C28/C28M Specification for Gypsum Plasters
C472 Test Methods for Physical Testing of Gypsum, Gypsum Plasters and Gypsum Concrete
C511 Specification for Mixing Rooms, Moist Cabinets, Moist Rooms, and Water Storage Tanks Used in the Testing of Hydraulic
Cements and Concretes
3. Terminology
3.1 Definitions—For definitions relating to gypsum and related building materials and systems, see Terminology C11.
4. Physical Properties
4.1 General—The bonding compound shall be a film forming, non-oxidizing, non-toxic, non-flammable composition suitable
for application by brush, roller, and spray. The compound shall be tinted to show, by visual inspection, where it has been applied.
The tinting material shall not show through the material being bonded. The surfaces to which bonding compounds are applied shall
be relatively smooth, clean, and dry. Surface coatings shall be removed if their nature indicates an unsatisfactory condition.
Surfaces shall be prepared in accordance with the manufacturer’s directions.
4.2 Consistency—The bonding compound shall be of a homogeneous nature with no settling of the solids. The compound shall
be free of foreign matter, and when applied in accordance with the manufacturer’s directions, shall cover evenly.
4.3 Film Characteristics—A dry film of the bonding compound shall be uniform and smooth and shall remain flexible. The film
shall not be noticeably affected by mild acid or alkali.
5. Performance Requirements
5.1 Bonding Capability—A dry film of bonding compound shall be capable of bonding gypsum plaster immediately after drying
and 10 days after drying when tested as specified in Section 12.
This specification is under the jurisdiction of ASTM Committee C11 on Gypsum and Related Building Materials and Systems and is the direct responsibility of
Subcommittee C11.02 on Specifications and Test Methods for Accessories and Related Products.
Current edition approved May 1, 2009Sept. 1, 2014. Published May 2009October 2014. Originally approved in 1988. Last previous edition approved in 20042009 as
C631 – 95aC631 – 09.(2004). DOI: 10.1520/C0631-09.10.1520/C0631-09R14.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C631 − 09 (2014)
5.2 Degradation—Bonding compound that separates shall be able to be re-mixed to a uniform consistency when tested as
specified in Section 10.
5.3 High Temperature Stability—The bond strength shall be not less than 20 psi (138 kPa) when tested as specified in Section
9.
5.4 Freeze-Thaw Stability—The bond strength shall be not less than 20 psi (138 kPa) when tested as specified in Section 11.
5.5 Bond Strength—Bond strength of a fresh sample or a 30 day old 30-day-old sample shall be not less than 20 psi (138 kPa)
when tested as specified in Section 12.
6. Sampling
6.1 Take a sample of not less than 1 kg from each shipment or consignment for analysis and tests. Except in special cases, take
the sample from not less than three separate containers, chosen at random. In addition, take samples from containers that appear
to be nonrepresentative, and test separately. Immediately place the samples in airtight glass containers and transport to the testing
laboratory in these containers. Take precautions to reduce evaporation or drying to a minimum. Thoroughly mix the bonding
compound in the container if there is a tendency for liquid phase separation.
7. Apparatus
7.1 Moist Cabinet—Specification C511.
7.2 Oven—A forced draft type oven, having a temperature controlled at 140 6 5 °F 5°F (60 6 3 °C) 3°C) for high temperature
tests and 100 6 5 °F 5°F (38 6 3 °C) 3°C) for drying of the briquets.
7.3 Freezer—A freezer having a controlled temperature of − 10 6 2 °F 2°F (-23 6 1 °C).1°C).
7.4 Balance—A balance capable of weighing at least 2500 g at a precision of 0.1 g.
7.5 Timing Device—A standard clock or watch with second hand.
7.6 Tamper—A tamper made up of a nonabsorptive, nonabrasive, non-brittle material and having a cross section of ⁄2 in. by
1 in. (13 by 25 mm) and approximately 5 to 6 in. (130 to 150 mm) long. The tamping face shall be flat and at right angles to the
length of the tamper.
7.7 Straight Edge—A steel straight edge not less than 4 in. (100 mm) long and not less than ⁄16 in. (1.6 mm) nor more than
⁄8 in. (3.2 mm) in thickness.
7.8 Spatula—A spatula with a metal blade 6 in. (150 mm) in length and ⁄2 in. (13 mm) in width, with straight edges.
7.9 Paint Brush—A standard 1 in. (25 mm) wide brush, with natural or synthetic bristles.
7.10 Testing Machine—Any type that is of sufficient capacity and that is capable of applying the load continuously and without
shock at the rate of 0.05 in. (1.27 mm)/min, with provision for adjustment of the rate of loading.
7.11 Briquet Molds—The molds for making test specimens shall be made of metal not attacked by the plaster mortar and shall
have sufficient material in the sides to prevent spreading during molding. Gang molds, when used, shall be of the type shown in
Fig. 1. The dimensions of the briquet molds shall conform to the following requirements: width of mold, between inside faces, at
waist line of the briquet, 1 in. (25.4 mm) with permissible variations of 60.01 in. (0.25 mm) for molds in use and 60.005 in. (0.13
mm) for new molds; thickness of molds measured at the point of greatest thickness on either side of the mold at the waist line,
1 in. (25.4 mm) with permissible variations of + 0.004 in. (0.10 mm) and − 0.002 in. (0.05 mm) for new molds and − 0.02 in. (0.5
mm) for molds in use. The inside faces at the waist line shall have a vertical slot 0.03 in. (0.75 mm) wide by 0.06 in. (1.5 mm)
deep to accept the divider. The briquet specimens shall conform to the dimensional requirements shown in Fig. 2.
7.12 Divider—Sheet brass 0.02 in. (0.05 mm) thick, 1.1 in. (27.8 mm) wide by 1 in. (25.4 mm) high.
7.13 Clips for Briquet Testing Machine—The clips for holding the tension test specimen shall be in accordance with Fig. 3.
FIG. 1 Briquet Gang Mold
C631 − 09 (2014)
8. Conditioning
8.1 Room Temperature and Humidity—Maintain the air temperature in the vicinity of the mixing and testing area, 70 6 5 °F
(21 6 3 °C). 70 6 5°F (21 6 3°C). Maintain the relative humidity at 50 6 2 %.at 50 6 2 %.
8.2 Temperature of the Mixing Water— 72 6 2 °F (22 6 1 °C).72 6 2°F (22 6 1°C).
9. High Temperature Test
9.1 Significance and Use—This test method provides procedures for evaluating the bond strength of adhesives after being
exposed to accelerated aging at high temperature.
9.2 Specimen Preparation—For each test specimen, transfer the bonding compound, taken from the sample obtained, into a
standard 1 pt (400 mL) glass container.
9.3 Procedure—Place the specimen in the oven for 30 days. Remove the container, allow the compound to cool to room
temperature, mix the compound to a uniform consistency, and test as specified in Section 12.
9.4 Test and Retests—Test six briquets and report the average of the test results. If the result of any one of the six tests varied
more than 15 % from the average, reject it and report the average of the other five tests. If the results from more than two tests
vary more than 15 % from the average, reject the series and retest.
9.5 Precision and Bias—The precision and bias of the High Temperature Test for determining bond strength after exposure to
high temperature is essentially the same as specified in the test method for bond strength, 12.7.
NOTE 1—1 in. = 25.4 mm
FIG. 2 Briquet Specimen for Tensile Strength Test
10. Degradation Test
10.1 Significa
...
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