ASTM F112-00

Standard Test Method for Sealability of Enveloped Gaskets

SCOPE
1.1 This test method covers the evaluation of the sealing properties of enveloped gaskets for use with corrosion-resistant process equipment. Enveloped gaskets are described as gaskets having some corrosion-resistant covering over the internal area normally exposed to the corrosive environment. The shield material may be plastic (such as polytetrafluoroethylene) or metal (such as tantalum). A resilient conformable filler is usually used inside the envelope. The design and construction of nonmetallic gaskets is covered in Practice F336
1.2 The values stated in SI units are to be regarded as the standard.  
1.3  This standard does not purport to address all of the safety problems 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. For specific precautionary statements, see Section 6.

General Information

• Status: Historical
• Publication Date: 09-Oct-2000
• ICS: 21.140 - Seals, glands
• Technical Committee: F03 - Gaskets
• Drafting Committee: F03.10 - Composite Gaskets

Relations

• Replaced By: ASTM F112-00e1 - Standard Test Method for Sealability of Enveloped Gaskets
• Effective Date: 10-Oct-2000
• Referred By: ASTM F336-02(2023) - Standard Practice for Design and Construction of Nonmetallic Enveloped Gaskets for Corrosive Service
• Effective Date: 10-Oct-2000
• Referred By: ASTM F363-99(2018) - Standard Test Method for Corrosion Testing of Gaskets
• Effective Date: 10-Oct-2000

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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:F112–00
Standard Test Method for
Sealability of Enveloped Gaskets
This standard is issued under the fixed designation F 112; 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 applied to the gasket, air at the specified pressure is introduced
into the test chamber and then the test chamber is sealed.
1.1 This test method covers the evaluation of the sealing
Pressure and temperature readings are taken and recorded at
propertiesofenvelopedgasketsforusewithcorrosion-resistant
2 specified intervals. The leakage rate is measured by the change
process equipment. Enveloped gaskets are described as gas-
in the test chamber pressure over time. The flange load on the
kets having some corrosion-resistant covering over the internal
gasket is increased and the process is repeated.
area normally exposed to the corrosive environment. The
3.2 Results of the sealability test are expressed as a graph of
shieldmaterialmaybeplastic(suchaspolytetrafluoroethylene)
the remaining test chamber pressure versus time for the
or metal (such as tantalum). A resilient conformable filler is
specified conditions.
usually used inside the envelope. The design and construction
of nonmetallic gaskets is covered in Practice F 336.
4. Significance and Use
1.2 The values stated in SI units are to be regarded as the
4.1 This test method is designed to evaluate all types of
standard.
enveloped gaskets under controlled conditions with respect to
1.3 This standard does not purport to address all of the
leakage and to provide measurable leakage rates.
safety concerns, if any, associated with its use. It is the
4.2 Determining torque required to seal a given gasket is
responsibility of the user of this standard to establish appro-
also part of this test method. By converting the torque at
priate safety and health practices and determine the applica-
sealing to total bolt load, useful design information may be
bility of regulatory limitations prior to use. For specific
obtained for other standard and nonstandard openings.
precautionary statements, see Section 6.
4.3 This test method may be used as an incoming quality
2. Referenced Documents control test to evaluate similar gaskets from different suppliers.
This test method may also be used as a quality control test
2.1 ASTM Standards:
whenparametersareagreeduponbetweentheproducerandthe
F 336 Design and Construction of Nonmetallic Enveloped
user.
Gaskets for Corrosive Service
4.4 Leakage through the gasket or over the gasket, or both,
3. Summary of Method
is determined by this test method.
3.1 An enveloped gasket is compressed between two bolted
5. Apparatus
flanges in a special test fixture . After the specified load is
5.1 Leakage Test Unit—The unit shall contain a suitable
pressure gage to read from 0 to 2.1 MPa (0 to 300 psig) and
This test method is under the jurisdiction ofASTM Committee F03 on Gaskets
mounted as shown in Fig. 1.
and is the direct responsibility of Subcommittee F03.10 on Composite Gaskets.
5.2 Compressed Air Supply, capable of supplying 621 kPa
Current edition approved Oct. 10, 2000. Published November 2000. Originally
(90 psig) to the test unit.
published as F 112 – 70. Last previous edition F 112 - 95.
5.3 Temperature Indicating Device—A thermometer ca-
This test method is to be used in place of ASTM Test Methods F 37, for
SealabilityofGasketMaterials(AnnualBookofASTMStandards,Vol09.02),which
pable of reading in increments of 1°C in the ambient tempera-
applies only to single-component gasket materials and is not applicable to
ture range.
envelope-style gaskets. This fixture may also be used for other gasket materials or
designs, with or without modification.
6. Hazards
Supporting data are available from ASTM Headquarters. Request RR:
F03-1000.
6.1 Use only a unit suitable for a minimum of 1034 kPa
Annual Book of ASTM Standards, Vol 09.02.
(150 psig).
Detailed drawing of the test fixture is available at a nominal cost from ASTM
6.2 Ametal shield box with access doors is suggested as an
Headquarters, 100 Barr Harbor Drive, West Conshohocken, PA 19428. Request
Adjunct No.ADJF0112.Asuitable test unit can be obtained from the Pfaudler Co.,
added safety factor.
1000 West Ave., Rochester, NY 14603.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F112
NOTE 1—Tighten bolts evenly; follow numerical sequence.
FIG. 2 Bolt Tightening Progression
9.5 Apply 621 kPa (90 psig) of air pressure into the test unit
and seal. Record the pressure readings every hour for4hand
then at the end of 20 h, but since the readings are temperature
dependent, take and record the temperature within the oil-filled
FIG. 1 Test Unit
thermowell to coincide with the time of the pressure readings.
Apply corrections if required.
9.6 Fill the test fixture thermowell three-quarters full with a
6.3 Prior to performing any tests, inspect the unit for
light oil. Allow 15 minutes for the temperature to stabilize,
damage, corrosion, and also for metal fatigue cracks that may
and insert the temperature sensor.
have developed.
9.7 Retighten the bolts to 57 N·m (42 lbf·ft) in accordance
with 9.4 and proceed as in 9.5.
7. Test Specimen
9.8 Continue testing using bolt tensions of 85 N·m (63
7.1 Commercial 102-mm (4-in.) nominal size enveloped lbf·ft), 102 N·m (75 lbf·ft), and 122 N·m (90 lbf·ft) in
accordance with 9
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