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ASTM F2523-13(2020)

(Practice)

Standard Practice for Blowout Resistance of Room-Temperature Vulcanized Elastomers

Standard Practice for Blowout Resistance of Room-Temperature Vulcanized Elastomers

SIGNIFICANCE AND USE
5.1 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.  
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
31-Dec-2019
ICS
83.060 - Rubber
Technical Committee
F03 - Gaskets
Drafting Committee
F03.70 - Formed in Place Gaskets
Current Stage
Ref Project

Relations

Refers
ASTM F2468-05(2019) - Standard Classification for Specifying Silicone Adhesives and Sealants for Transportation Applications
Effective Date
01-May-2019

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ASTM F2523-13(2020) - Standard Practice for Blowout Resistance of Room-Temperature Vulcanized ElastomersASTM F2523-13(2020) - Standard Practice for Blowout Resistance of Room-Temperature Vulcanized Elastomers
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ASTM F2523-13(2020) - Standard Practice for Blowout Resistance of Room-Temperature Vulcanized Elastomers
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F2523 − 13 (Reapproved 2020)
Standard Practice for
Blowout Resistance of Room-Temperature Vulcanized
1
Elastomers
This standard is issued under the fixed designation F2523; 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 3.2 Definitions of Terms Specific to This Standard:
3.2.1 blowout, n—disruption of the uncured RTV integrity
1.1 Thispracticeprovidesameanstodeterminetheblowout
inajointfromsystempressurizationresultinginsuddenlossof
resistance of a room-temperature vulcanized elastomer system
pressure.
(RTV) using a standard fixture.
3.2.2 T–joint, n—interface created in a sealing surface
1.2 The values stated in SI units are to be regarded as
where three structural components meet.
standard. No other units of measurement are included in this
3.2.2.1 Discussion—This interface may exist as a small gap
standard.
requiring a material such as room-temperature vulcanized
1.3 This standard does not purport to address all of the
elastomer (RTV) to seal.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 3.3 Acronyms:
priate safety, health, and environmental practices and deter- 3.3.1 RTV—room-temperature vulcanized elastomer
mine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accor-
4. Summary of Practice
dance with internationally recognized principles on standard-
4.1 Condensation cures RTVs as a one-component system
ization established in the Decision on Principles for the
cure when exposed to moisture in the ambient air or as
Development of International Standards, Guides and Recom-
two-component systems when those components are mixed
mendations issued by the World Trade Organization Technical
together.RTVsareoftenusedtosealjointswherethreeflanges
Barriers to Trade (TBT) Committee.
meet (T joints) such as an automotive engine’s front cover,
engineblock,andoilpan.Becauseofmachiningandassembly
2. Referenced Documents
tolerance variations, theseTjoints may have a slight misalign-
2
2.1 ASTM Standards:
ment or gap.We also find gaps in the half-round area of the oil
D907Terminology of Adhesives
pantoblockandinthevalleybetweentheintakemanifoldand
D1566Terminology Relating to Rubber
block on certain V-engines as a result of manufacturing
F2468Classification for Specifying Silicone Adhesives and
tolerances.TheRTVisusedtosealinfluids.Insomeassembly
Sealants for Transportation Applications
line applications, soon after the RTVis applied and the flanges
2.2 SAE Standard:
fastenedtogether,thesystemissubjectedtoanairdecaytestat
SAE J1199Mechanical and Material Requirements for Met-
a designated pressure. This test is used to determine an RTV’s
3
ric Externally Threaded Steel Fasteners
capability to withstand loss of integrity at this designated
pressure.
3. Terminology
3.1 Definitions—Some terms in this practice are defined in 4.2 When using this practice, one must first determine the
Terminologies D907 and D1566. maximum gap based on stack tolerances of the system. A
two-piece round fixture uses the top portion to mirror the
1 system gap (default gap is 1mm), while the bottom half
ThispracticeisunderthejurisdictionofASTMCommitteeF03onGasketsand
is the direct responsibility of Subcommittee F03.70 on Formed in Place Gaskets.
provides the mating flange and the connection for the pressure
Current edition approved Jan. 1, 2020. Published January 2020. Originally
input. The gap is machined into the top half of the fixture in a
approved in 2005. Last previous edition approved in 2013 as F2523–13. DOI:
“pie slice” 60° angle.Acontinuous bead of RTV is applied to
10.1520/F2523-13R20.
2
theentirebottomportionofthefixture,thetophalfiscarefully
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
attached, and the fixture is pressurized to the prescribed limits
Standards volume information, refer to the standard’s Document Summary page on
and held for a specified time period. If the RTV is not capable
the ASTM website.
3 ofsealingatthepressureapplied,asuddenlossofpressurewill
Available from Society of Automotive Engineers (SAE), 400 Commonwealth
Dr., Warrendale, PA 15096-0001. occur.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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FIG. 1 Bridge Joint Configuration  
1.2.2 As a beveled bridge joint, the seal is applied on the beveled edge of a substrate to bridge a joint opening. See Fig. 2.  
FIG. 2 Beveled Bridge Joint Configuration  
1.2.3 As a U-joint, the seal is applied in a U-configuration within a joint. See Fig. 3.
FIG. 3 U-Joint Configuration  
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