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ASTM C864-05

(Specification)

Standard Specification for Dense Elastomeric Compression Seal Gaskets, Setting Blocks, and Spacers

Standard Specification for Dense Elastomeric Compression Seal Gaskets, Setting Blocks, and Spacers

ABSTRACT
This specification covers preformed dense elastomeric compression gaskets and accessories for use in sealing and glazing applications. These materials are generally used to seal or serve as components of compression sealing systems between mechanically restrained surfaces in building constructions. The elastomeric materials shall be manufactured from a high-quality ozone-resistant compound that, when properly cured, will comply to the requirements specified. The cured compound shall be suitable for use where resistance to sunlight, weathering, oxidation, and permanent deformation under load are of prime importance. The preformed gaskets or shapes shall be free of porosity, surface defects, and dimensional irregularities that may affect serviceability. The specimens shall be subjected to the following test methods: hardness test, compression set test, ozone resistance test, tensile strength test, elongation test, heat aging test, tear strength test, brittleness temperature test, non-staining test, and flame propagation test.
SCOPE
1.1 This specification covers preformed dense elastomeric compression gaskets and accessories for use in sealing and glazing applications. These materials are generally used to seal or serve as components of compression sealing systems between mechanically restrained surfaces in building constructions.
1.2 Test Method C 1166, as referenced in this specification, should be used to measure and describe the properties of materials, products, or assemblies in response to heat and flame under controlled laboratory conditions and should not be used to describe or appraise the fire hazard or fire risk of materials, products, or assemblies under actual fire conditions. However, results of this test may be used as elements of a fire risk assessment which takes into account all of the factors which are pertinent to an assessment of the fire hazard of a particular end use.
The following precautionary statement pertains only to the test method portion, Section 9, of 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.
1.3 The committee with jurisdiction over this standard is not aware of any comparable standards published by other organizations.

General Information

Status
Historical
Publication Date
30-Apr-2005
ICS
91.100.50 - Binders. Sealing materials
Technical Committee
C24 - Building Seals and Sealants
Drafting Committee
C24.73 - Compression Seal and Lock Strip Gaskets
Current Stage
Ref Project

Relations

Replaces
ASTM C864-99(2005) - Standard Specification for Dense Elastomeric Compression Seal Gaskets, Setting Blocks, and Spacers
Effective Date
01-May-2005
Replaced By
ASTM C864-05(2011) - Standard Specification for Dense Elastomeric Compression Seal Gaskets, Setting Blocks, and Spacers
Effective Date
01-Jun-2011
Referred By
ASTM C1166-21 - Standard Test Method for Flame Propagation of Dense and Cellular Elastomeric Gaskets and Accessories
Effective Date
01-May-2005
Referred By
ASTM C1401-23 - Standard Guide for Structural Sealant Glazing
Effective Date
01-May-2005
Referred By
ASTM E2203-14(2018) - Standard Specification for Dense Thermoplastic Elastomers Used for Compression Seals, Gaskets, Setting Blocks, Spacers and Accessories
Effective Date
01-May-2005
Referred By
ASTM C1242-23 - Standard Guide for Selection, Design, and Installation of Dimension Stone Attachment Systems
Effective Date
01-May-2005
Referred By
ASTM C964-20 - Standard Guide for Lock-Strip Gasket Glazing
Effective Date
01-May-2005

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ASTM C864-05 - Standard Specification for Dense Elastomeric Compression Seal Gaskets, Setting Blocks, and SpacersASTM C864-05 - Standard Specification for Dense Elastomeric Compression Seal Gaskets, Setting Blocks, and Spacers
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ASTM C864-05 - Standard Specification for Dense Elastomeric Compression Seal Gaskets, Setting Blocks, and Spacers
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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: C864 – 05
Standard Specification for
Dense Elastomeric Compression Seal Gaskets, Setting
1
Blocks, and Spacers
This standard is issued under the fixed designation C864; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope C1166 Test Method for Flame Propagation of Dense and
Cellular Elastomeric Gaskets and Accessories
1.1 This specification covers preformed dense elastomeric
D395 Test Methods for Rubber Property—Compression Set
compression gaskets and accessories for use in sealing and
D412 Test Methods for Vulcanized Rubber and Thermo-
glazing applications.These materials are generally used to seal
plastic Elastomers—Tension
or serve as components of compression sealing systems be-
D573 Test Method for Rubber—Deterioration in an Air
tween mechanically restrained surfaces in building construc-
Oven
tions.
D624 Test Method for Tear Strength of Conventional Vul-
1.2 Test Method C1166, as referenced in this specification,
canized Rubber and Thermoplastic Elastomers
should be used to measure and describe the properties of
D746 Test Method for Brittleness Temperature of Plastics
materials, products, or assemblies in response to heat and
and Elastomers by Impact
flame under controlled laboratory conditions and should not be
D925 Test Methods for Rubber Property—Staining of Sur-
used to describe or appraise the fire hazard or fire risk of
faces (Contact, Migration, and Diffusion)
materials, products, or assemblies under actual fire conditions.
D1149 Test Methods for Rubber Deterioration—Cracking
However, results of this test may be used as elements of a fire
in an Ozone Controlled Environment
risk assessment which takes into account all of the factors
D1566 Terminology Relating to Rubber
which are pertinent to an assessment of the fire hazard of a
D2240 Test Method for Rubber Property—Durometer
particular end use.
Hardness
1.3 The following precautionary statement pertains only to
D3182 Practice for Rubber—Materials, Equipment, and
the test method portion, Section 9, of this specification: This
Procedures for Mixing Standard Compounds and Prepar-
standard does not purport to address all of the safety concerns,
ing Standard Vulcanized Sheets
if any, associated with its use. It is the responsibility of the user
of this standard to establish appropriate safety and health
3. Terminology
practices and determine the applicability of regulatory limita-
3.1 Definitions:
tions prior to use.
3.1.1 Forthedefinitionofelastomer,andotherdefinitionsof
1.4 Thecommitteewithjurisdictionoverthisstandardisnot
terms used in this specification, see Terminology C717.
aware of any comparable standards published by other orga-
nizations.
4. Materials and Manufacture
4.1 The elastomeric materials shall be manufactured from a
2. Referenced Documents
2
high-quality ozone-resistant compound that, when properly
2.1 ASTM Standards:
cured, will comply with this specification.
C717 Terminology of Building Seals and Sealants
4.2 The cured compound shall be suitable for use where
resistance to sunlight, weathering, oxidation, and permanent
1
This specification is under the jurisdiction of ASTM Committee C24 on
deformation under load are of prime importance.
Building Seals and Sealants and is the direct responsibility of Subcommittee C24.73
4.3 The preformed gaskets or shapes shall be free of
on Compression Seal and Lock-Strip Gaskets.
porosity, surface defects, and dimensional irregularities that
Current edition approved May 1, 2005. Published June 2005. Originally
approvedin1977.Lastpreviouseditionapprovedin2005asC864 – 99(2005).DOI: may affect serviceability.
10.1520/C0864-05.
4.4 Unless otherwise specified, the material shall be black.
2
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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
C864 – 05
5. Physical Properties buffed surface, depending on the size and shape of the
specimen (Note 1). Determine the change in hardness after
5.1 The physical properties of the material shall conform to
oven aging for 70 h at 100 6 1°C (212 6 2°F).
the requirements specified in Table 1.
NOTE 1—Hardness readings for the purpose of approximate determi-
6. Dimensional Tolerances
nationsmaybetakenfromthedumbbel
...

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5.1 It is difficult to establish a precise correlation between laboratory accelerated and natural weathering because of  (1) geographical climatic variations, local weather variation from normal, and local pollutants and (2) the fact that the acceleration factor is material dependent, varying with the type of material as well as its formulation. This test method is used to determine the resistance of a sealant to laboratory accelerated weathering and, if a control material with known outdoor weathering performance is used, the relative weathering performance of the sealant against that of the control material.  
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5.1 The old saying “A chain is only as strong as its weakest link” is very applicable to a SSG system. In reality, a SSG system, to be successful, must establish and maintain a chain of adhesion. For example, a factory applied finish must adhere adequately to a metal framing member, a structural glazing sealant to that metal finish, that structural glazing sealant to a reflective coating on a glass lite, and lastly, that reflective coating to a glass surface. This guide will assist in the identification and development of, among others, performance criteria, test methods, and industry practices that should be implemented to obtain the required structural glazing sealant adhesion and compatibility with other system components.  
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5.1 It is known that solar radiation contributes to the degradation of sealants in exterior building joints. The use of a laboratory accelerated weathering machine with actinic radiation, moisture and heat appears to be a feasible means to give indications of early degradation by the appearance of sealant cracking. However, simulated weather factors in combination with extension may produce more severe degradation than weather factors only. Therefore, the effect of the weathering test is made more sensitive by the addition of the bending of the specimen at cold temperature.
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1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.  
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1.4 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
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