ASTM C864-99
(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
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 C1166, 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.
1.3 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 problems, 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 864 – 99
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 624 Test Method for Tear Strength of Conventional
Vulcanized Rubber and Thermoplastic Elastomers
1.1 This specification covers preformed dense elastomeric
D 746 Test Method for Brittleness Temperature of Plastics
compression gaskets and accessories for use in sealing and
and Elastomers by Impact
glazing applications. These materials are generally used to seal
D 925 Test Methods for Rubber Property—Staining of Sur-
or serve as components of compression sealing systems be-
faces (Contact, Migration, and Diffusion)
tween mechanically restrained surfaces in building construc-
D 1149 Test Method for Rubber Deterioration—Surface
tions.
Ozone Cracking in a Chamber
1.2 Test Method C 1166, as referenced in this specification,
D 1566 Terminology Relating to Rubber
should be used to measure and describe the properties of
D 2240 Test Method for Rubber Property—Durometer
materials, products, or assemblies in response to heat and
Hardness
flame under controlled laboratory conditions and should not be
D 3182 Practice for Rubber—Materials, Equipment, and
used to describe or appraise the fire hazard or fire risk of
Procedures for Mixing Standard Compounds and Prepar-
materials, products, or assemblies under actual fire conditions.
ing Standard Vulcanized Sheets
However, results of this test may be used as elements of a fire
risk assessment which takes into account all of the factors
3. Terminology
which are pertinent to an assessment of the fire hazard of a
3.1 Definitions:
particular end use.
3.1.1 Forthedefinitionofelastomer,andotherdefinitionsof
1.3 The following precautionary statement pertains only to
terms used in this specification, see Terminology C 717.
the test method portion, Section 9, of this specification: This
3.2 Definitions of Terms Specific to This Standard:
standard does not purport to address all of the safety concerns,
3.2.1 compression seal—a type of joint seal in which
if any, associated with its use. It is the responsibility of the user
weathertightness is maintained by the exertion of compressive
of this standard to establish appropriate safety and health
pressure on the gasket or sealing material.
practices and determine the applicability of regulatory limita-
3.2.2 gasket—a resilient preformed and precured shape
tions prior to use.
intended for use in providing a compression seal.
2. Referenced Documents 3.2.3 spacer—a material used to maintain space between a
glass or panel and its surrounding frame.
2.1 ASTM Standards:
2 3.2.4 setting block—a block of resilient material used to
C 717 Terminology of Building Seals and Sealants
support a pane of glass or a panel within a frame.
C 1166 Test Method for Flame Propagation of Dense and
Cellular Elastomeric Gaskets and Accessories
4. Materials and Manufacture
D 395 Test Methods for Rubber Property—Compression
3 4.1 The elastomeric materials shall be manufactured from a
Set
high-quality ozone-resistant compound that, when properly
D 412 Test Methods for Vulcanized Rubber and Thermo-
cured, will comply with this specification.
plastic Rubbers and Thermoplastic Elastomers—Tension
4.2 The cured compound shall be suitable for use where
D 573 Test Method for Rubber—Deterioration in an Air
resistance to sunlight, weathering, oxidation, and permanent
Oven
deformation under load are of prime importance.
4.3 The preformed gaskets or shapes shall be free of
This specification is under the jurisdiction of ASTM Committee C-24 on porosity, surface defects, and dimensional irregularities that
Building Seals and Sealants and is the direct responsibility of Subcommittee C24.73
may affect serviceability.
on Compression Seal and Lock-Strip Gaskets.
4.4 Unless otherwise specified, the material shall be black.
Current edition approved Jan. 10, 1999. Published April 1999. Originally
published as C 864 – 77. Last previous edition C 864 – 98.
Annual Book of ASTM Standards, Vol 04.07.
3 4
Annual Book of ASTM Standards, Vol 09.01. Annual Book of ASTM Standards, Vol 08.01.
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C 864
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
nationsmaybetakenfromthedumbbellspecimens,recognizingthatthese
may vary slightly from those taken fr
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