ASTM C631-09(2014)

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.

General Information

• Status: Historical
• Publication Date: 31-Aug-2014
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: C11 - Gypsum and Related Building Materials and Systems
• Drafting Committee: C11.02 - Specifications and Test Methods for Accessories and Related Products

Relations

• Replaces: ASTM C631-09 - Standard Specification for Bonding Compounds for Interior Gypsum Plastering
• Effective Date: 01-Sep-2014
• Replaced By: ASTM C631-09(2020) - Standard Specification for Bonding Compounds for Interior Gypsum Plastering
• Effective Date: 01-Apr-2020
• Referred By: ASTM C842-05(2021) - Standard Specification for Application of Interior Gypsum Plaster
• Effective Date: 01-Sep-2014
• Referred By: ASTM C843-23 - Standard Specification for Application of Gypsum Veneer Plaster
• Effective Date: 01-Sep-2014
• Referred By: ASTM C926-23 - Standard Specification for Application of Portland Cement-Based Plaster
• Effective Date: 01-Sep-2014

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:C631 −09 (Reapproved 2014)
Standard Specification for
1
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
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.
1
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.
2
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 [e-mail]. 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
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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
...

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
1
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
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.
1
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.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. 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
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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
...