ASTM C864-99(2005)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: C 864 – 99 (Reapproved 2005)
Standard Specification for
Dense Elastomeric Compression Seal Gaskets, Setting
Blocks, and Spacers
This standard is issued under the fixed designation C 864; 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 D 573 Test Method for Rubber—Deterioration in an Air
Oven
1.1 This specification covers preformed dense elastomeric
D 624 Test Method for Tear Strength of Conventional
compression gaskets and accessories for use in sealing and
Vulcanized Rubber and Thermoplastic Elastomers
glazing applications.These materials are generally used to seal
D 746 Test Method for Brittleness Temperature of Plastics
or serve as components of compression sealing systems be-
and Elastomers by Impact
tween mechanically restrained surfaces in building construc-
D 925 Test Methods for Rubber Property—Staining of Sur-
tions.
faces (Contact, Migration, and Diffusion)
1.2 Test Method C 1166, as referenced in this specification,
D 1149 Test Method for Rubber Deterioration—Surface
should be used to measure and describe the properties of
Ozone Cracking in a Chamber
materials, products, or assemblies in response to heat and
D 1566 Terminology Relating to Rubber
flame under controlled laboratory conditions and should not be
D 2240 Test Method for Rubber Property—Durometer
used to describe or appraise the fire hazard or fire risk of
Hardness
materials, products, or assemblies under actual fire conditions.
D 3182 Practice for Rubber—Materials, Equipment, and
However, results of this test may be used as elements of a fire
Procedures for Mixing Standard Compounds and Prepar-
risk assessment which takes into account all of the factors
ing Standard Vulcanized Sheets
which are pertinent to an assessment of the fire hazard of a
particular end use.
3. Terminology
1.3 The following precautionary statement pertains only to
3.1 Definitions:
the test method portion, Section 9, of this specification: This
3.1.1 Forthedefinitionofelastomer,andotherdefinitionsof
standard does not purport to address all of the safety concerns,
terms used in this specification, see Terminology C 717.
if any, associated with its use. It is the responsibility of the user
3.2 Definitions of Terms Specific to This Standard:
of this standard to establish appropriate safety and health
3.2.1 compression seal—a type of joint seal in which
practices and determine the applicability of regulatory limita-
weathertightness is maintained by the exertion of compressive
tions prior to use.
pressure on the gasket or sealing material.
2. Referenced Documents 3.2.2 gasket—a resilient preformed and precured shape
intended for use in providing a compression seal.
2.1 ASTM Standards:
3.2.3 spacer—a material used to maintain space between a
C 717 Terminology of Building Seals and Sealants
glass or panel and its surrounding frame.
C 1166 Test Method for Flame Propagation of Dense and
3.2.4 setting block—a block of resilient material used to
Cellular Elastomeric Gaskets and Accessories
support a pane of glass or a panel within a frame.
D 395 Test Methods for Rubber Property—Compression
Set
4. Materials and Manufacture
D 412 Test Methods for Vulcanized Rubber and Thermo-
4.1 The elastomeric materials shall be manufactured from a
plastic Rubbers and Thermoplastic Elastomers—Tension
high-quality ozone-resistant compound that, when properly
cured, will comply with this specification.
This specification is under the jurisdiction of ASTM Committee C24 on 4.2 The cured compound shall be suitable for use where
Building Seals and Sealants and is the direct responsibility of Subcommittee C24.73
resistance to sunlight, weathering, oxidation, and permanent
on Compression Seal and Lock-Strip Gaskets.
deformation under load are of prime importance.
Current edition approved Feb. 1, 2005. Published March 2005. Originally
4.3 The preformed gaskets or shapes shall be free of
approved in 1977. Last previous edition approved in 1999 as C 864 – 99.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
porosity, surface defects, and dimensional irregularities that
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
may affect serviceability.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
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C 864 – 99 (2005)
4.4 Unless otherwise specified, the material shall be black. buffed surface, depending on the size and shape of the
specimen (Note 1). Determine the change in hardness after
5. Physical Properties
oven aging for 70 h at 100 6 1°C (212 6 2°F).
5.1 The physical properties of the material shall conform to
NOTE 1—Hardness readings for the purpose of approximate determi-
the requirements specified in Table 1.
nationsmaybetakenfromthedumbbellspecimens,recognizingthatthese
may vary slightly from those taken from the finished material.
6. Dimensional Tolerances
6.1 Permissible variations in all cross-sectional dimensions 9.2 Compression Set—Test
...