ASTM F806-99a

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: F 806 – 99a
Standard Test Method for
Compressibility and Recovery of Laminated Composite
Gasket Materials
This standard is issued under the fixed designation F 806; 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 4. Apparatus
1.1 This test method covers determination of the short-time 4.1 The testing machine shall consist of the following
compressibility and recovery at room temperature of laminated components.
composite gasket materials. 4.1.1 Penetrators— A matched pair of opposing steel cyl-
1.2 This test method is not intended as a test for compress- inders (within 6 0.025 mm (0.001 in.)) specified for the type
ibility under prolonged stress application, that is “creep,” or for of material being tested, with the cylinder ends hardened and
recovery following such prolonged stress application, the ground. Penetrator diameters for various types of laminated
inverse of which is generally referred to as “compression set.” composite gasket materials are shown in Table 1.
Also, it is only intended for tests at room temperature. 4.1.2 Dial—An indicating dial, or dials, graduated in 0.025
1.3 The values stated in SI units are to be regarded as the mm (0.001 in.) to show the thickness of the specimen during
standard. The inch-pound units given in parentheses are for the test. Readings shall be estimated to the nearest 0.0025 mm
information only. (0.0001 in.).
1.4 This standard does not purport to address all of the 4.1.3 Preload, shall include the weight of the penetrator
safety concerns, if any, associated with its use. It is the itself and added weights to give the value specified within 6
responsibility of the user of this standard to establish appro- 1 %. A 22.2-N (5-lbf) preload shall be used.
priate safety and health practices and determine the applica- 4.1.4 Loading Device— A device for applying a specified
bility of regulatory limitations prior to use. major load to the upper end of the penetrator, which may
consist of an arrangement of dead weights, a hydraulic cylin-
2. Referenced Documents
der, an air cylinder, or any other device capable of applying the
2.1 ASTM Standards: major load at a slow uniform rate and to an accuracy of 61%.
F 104 Classification System for Nonmetallic Gasket Mate-
The major load shall be in addition to the specified preload.
rials Major loads for various types of laminated composite gasket
materials are shown in Table 1.
3. Significance and Use
5. Test Specimen
3.1 This test method is designed to compare related lami-
nated composite gasket materials under controlled conditions
5.1 The test specimen may be either circular or rectangular
and their short-time compressibility and recovery at room in shape. The minimum size shall be 12.7 mm (0.5 in.) larger
temperature. It measures compressibility with a matched pair
than the penetrator diameter being used, and the maximum size
of opposing upper and lower penetrators which provide better
shall be 38.1 mm (1.5 in.) larger than it. The thickness shall be
precision and bias than methods using an upper penetrator and that of the laminated composite gasket. Take care that the
a lower anvil. It is difficult to prepare undistorted test speci-
specimen is flat, especially around the planned contact point of
mens from laminated composite gasket materials which will the opposing penetrators.
lay flat on an anvil. Also, with many composites having rigid
6. Conditioning
inner layers the load on the upper penetrator is distributed over
the bottom anvil area resulting in a lower than actual com- 6.1 When all nonmetallic layers of the laminated composite
pressibility reading. This test method may be used as a routine are the same type, condition in accordance with that type as
test method when agreed upon between the purchaser and the shown in Table 1.
producer. 6.2 When the nonmetallic layers of the laminated composite
are of different types, the specimen shall be conditioned for 22
h in a controlled-humidity room or in a closed chamber of air
This test method is under the jurisdiction of ASTM Committee F-3 on Gaskets
and is the direct responsibility of Subcommittee F03.20 on Mechanical Test
Methods.
Current edition approved July 10, 1999. Published August 1999. Originally Blueprints are available from ASTM Headquarters. Order PCN-12-608060-20.
published as F 806 – 83. Last previous edition F 806 – 99. A list of recommended suppliers, by Subcommittee F03.20, is available through
Annual Book of ASTM Standards, Vol 09.02. ASTM.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
F 806
TABLE 1 Conditioning and Test Loads for Laminated Composite Gasket Materials
NOTE 1—If the nonmetallic layers of the laminated composite are not all the same material, then the test loads may be as agreed upon between the
producer and user.
F 104
Total Load (sum of Major Load
A
Type of Gasket Mate- Identification
and Preload)
Proce- Penetrator Preload, Major Load,
rial in the Nonmetallic First Two Conditioning Procedure
dure Diameter, mm (in.) N (lbf) N (lbf)
Layers Numerals of Six-
N (lbf) MPa (psi)
Digit
...