ASTM F2523-07
(Practice)Standard Practice for Blowout Resistance of Room-Temperature Vulcanized Elastomers
Standard Practice for Blowout Resistance of Room-Temperature Vulcanized Elastomers
SIGNIFICANCE AND USE
This practice may be used to determine the viability of an RTV sealant to withstand pressure leak testing before cure at maximum gap conditions of a system. This practice may be used to indicate an RTV’s acceptability to undergo an assembly line leak check without causing a leak path due to material blow out.
SCOPE
1.1 This practice provides a means to determine the blowout resistance of a room-temperature vulcanized elastomer system (RTV) using a standard fixture.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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:F2523–07
Standard Practice for
Blowout Resistance of Room-Temperature Vulcanized
1
Elastomers
This standard is issued under the fixed designation F 2523; 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 3.2.2 T–joint, n—interface created in a sealing surface
where three structural components meet.
1.1 Thispracticeprovidesameanstodeterminetheblowout
3.2.2.1 Discussion—This interface may exist as a small gap
resistance of a room-temperature vulcanized elastomer system
requiring a material such as room-temperature vulcanized
(RTV) using a standard fixture.
elastomer (RTV) to seal.
1.2 The values stated in SI units are to be regarded as
3.3 Acronym:
standard. No other units of measurement are included in this
3.3.1 RTV—room-temperature vulcanized elastomer
standard.
1.3 This standard does not purport to address all of the
4. Summary of Practice
safety concerns, if any, associated with its use. It is the
4.1 Condensation cures RTVs as a one-component system
responsibility of the user of this standard to establish appro-
cure when exposed to moisture in the ambient air or as
priate safety and health practices and determine the applica-
two-component systems when those components are mixed
bility of regulatory limitations prior to use.
together. RTVs are often used to seal joints where three flanges
2. Referenced Documents meet (T joints) such as an automotive engine’s front cover,
2
engine block, and oil pan. Because of machining and assembly
2.1 ASTM Standards:
tolerance variations, these T joints may have a slight misalign-
D 907 Terminology of Adhesives
ment or gap. We also find gaps in the half-round area of the oil
D 1566 Terminology Relating to Rubber
pan to block and in the valley between the intake manifold and
F 2468 ClassificationforSpecifyingSiliconeAdhesivesand
block on certain V-engines as a result of manufacturing
Sealants for Transportation Applications
tolerances.The RTVis used to seal in fluids. In some assembly
2.2 SAE Standard:
line applications, soon after the RTV is applied and the flanges
SAE J1199 Mechanical and Material Requirements for
3 fastened together, the system is subjected to an air decay test at
Metric Externally Threaded Steel Fasteners
a designated pressure. This test is used to determine an RTV’s
3. Terminology capability to withstand loss of integrity at this designated
pressure.
3.1 Definitions—Some terms in this practice are defined in
4.2 When using this practice, one must first determine the
Terminologies D 907 and D 1566.
maximum gap based on stack tolerances of the system. A
3.2 Definitions of Terms Specific to This Standard:
two-piece round fixture uses the top portion to mirror the
3.2.1 blowout, n—disruption of the uncured RTV integrity
system gap (default gap is 1 mm), while the bottom half
inajointfromsystempressurizationresultinginsuddenlossof
provides the mating flange and the connection for the pressure
pressure.
input. The gap is machined into the top half of the fixture in a
“pie slice” 60° angle. A continuous bead of RTV is applied to
the entire bottom portion of the fixture, the top half is carefully
1
This practice is under the jurisdiction ofASTM Committee F03 on Gaskets and
attached, and the fixture is pressurized to the prescribed limits
is the direct responsibility of Subcommittee F03.70 on Formed in Place Gaskets.
and held for a specified time period. If the RTV is not capable
Current edition approved Oct. 1, 2007. Published November 2007. Originally
ofsealingatthepressureapplied,asuddenlossofpressurewill
approved in 2005. Last previous edition approved in 2005 as F 2523 – 05.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or occur.
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
5. Significance and Use
the ASTM website.
3 5.1 This practice may be used to determine the viability of
Available from Society of Automotive Engineers (SAE), 400 Commonwealth
Dr., Warrendale, PA 15096-0001. an RTV sealant to withstand pressure leak testing before cure
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
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F2523–07
NOTE—Torque sequence shall be “crisscross” pattern.
FIG. 1 Aluminum Blowout Fixtures
at maximum gap conditions of a system. This practice may be
2
---------------------- Page: 2 ----------------------
F2523–07
usedtoindicateanRTV’sacceptabilitytoundergoanassembly 10. Procedure
line leak ch
...
This document is not anASTM standard and is intended only to provide the user of anASTM 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:F2523–05 Designation:F2523–07
Standard Practice for
Blowout Resistance of Room-Temperature Vulcanized
1
Elastomers
This standard is issued under the fixed designation F 2523; 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
1.1 This practice provides a means to determine the blowout resistance of a room-temperature vulcanized elastomer system
(RTV) using a standard fixture.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 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:
D 907 Terminology of Adhesives
D 1566 Terminology Relating to Rubber
F 2468 Classification for Specifying Silicone Adhesives and Sealants for Transportation Applications
2.2 SAE Standard:
3
SAE J1199 Mechanical and Material Requirements for Metric Externally Threaded Steel Fasteners
3. Terminology
3.1 Definitions—Some terms in this practice are defined in Terminologies D 907 and D 1566.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 blowout, n—disruption of the uncured RTV integrity in a joint from system pressurization resulting in sudden loss of
pressure.
3.2.2 T–joint, n—interface created in a sealing surface where three structural components meet.
3.2.2.1 Discussion—Thisinterfacemayexistasasmallgaprequiringamaterialsuchasroom-temperaturevulcanizedelastomer
(RTV) to seal.
3.3 Acronym:
3.3.1 RTV—room-temperature vulcanized elastomer
4. Summary of Practice
4.1 Condensation cures RTVs as a one-component system cure when exposed to moisture in the ambient air or as
two-component systems when those components are mixed together. RTVs are often used to seal joints where three flanges meet
(T joints) such as an automotive engine’s front cover, engine block, and oil pan. Because of machining and assembly tolerance
variations, these T joints may have a slight misalignment or gap. We also find gaps in the half-round area of the oil pan to block
and in the valley between the intake manifold and block on certain V-engines as a result of manufacturing tolerances. The RTV
is used to seal in fluids. In some assembly line applications, soon after the RTV is applied and the flanges fastened together, the
system is subjected to an air decay test at a designated pressure. This test is used to determine an RTV’s capability to withstand
loss of integrity at this designated pressure.
4.2 When using this practice, one must first determine the maximum gap based on stack tolerances of the system.Atwo-piece
round fixture uses the top portion to mirror the system gap (default gap is 1 mm), while the bottom half provides the mating flange
1
This practice is under the jurisdiction of ASTM Committee F03 on Gaskets and is the direct responsibility of Subcommittee F03.70 on Formed in Place Gaskets .
Current edition approved Oct. 1, 2005. Published November 2005.
Current edition approved Oct. 1, 2007. Published November 2007. Originally approved in 2005. Last previous edition approved in 2005 as F 2523 – 05.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM 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.
3
Available from Society of Automotive Engineers (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
F2523–07
and the connection for the pressure input. The gap is machined into the top half of the fixture in a “pie slice” 60° angle. A
continuous bead of RTV is applied to the entire bottom portion of the fixture, the top half is carefully attached, and the fixture is
pressurizedtotheprescribedlimitsandheldforaspecifiedtimeperiod.IftheRTVisnotcapableofsealingatthepressureapplied,
a sudden loss of pressure will occur.
5. Significance and Use
5.1 This practice may be used to determine the viability of an RT
...
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