ASTM F806-99a(2003)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:F806–99a (Reapproved 2003)
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 the bottom anvil area resulting in a lower than actual com-
pressibility reading. This test method may be used as a routine
1.1 This test method covers determination of the short-time
test method when agreed upon between the purchaser and the
compressibility and recovery at room temperature of laminated
producer.
composite gasket materials.
1.2 This test method is not intended as a test for compress-
4. Apparatus
ibilityunderprolongedstressapplication,thatis“creep,”orfor
4.1 The testing machine shall consist of the following
recovery following such prolonged stress application, the
components.
inverse of which is generally referred to as “compression set.”
4.1.1 Penetrators— A matched pair of opposing steel cyl-
Also, it is only intended for tests at room temperature.
inders (within 6 0.025 mm (0.001 in.)) specified for the type
1.3 The values stated in SI units are to be regarded as the
of material being tested, with the cylinder ends hardened and
standard. The inch-pound units given in parentheses are for
ground. Penetrator diameters for various types of laminated
information only.
composite gasket materials are shown in Table 1.
1.4 This standard does not purport to address all of the
4.1.2 Dial—An indicating dial, or dials, graduated in 0.025
safety concerns, if any, associated with its use. It is the
mm (0.001 in.) to show the thickness of the specimen during
responsibility of the user of this standard to establish appro-
the test. Readings shall be estimated to the nearest 0.0025 mm
priate safety and health practices and determine the applica-
(0.0001 in.).
bility of regulatory limitations prior to use.
4.1.3 Preload, shall include the weight of the penetrator
2. Referenced Documents itself and added weights to give the value specified within 6
1 %. A 22.2-N (5-lbf) preload shall be used.
2.1 ASTM Standards:
4.1.4 Loading Device— A device for applying a specified
F 104 Classification System for Nonmetallic Gasket Mate-
2 major load to the upper end of the penetrator, which may
rials
consist of an arrangement of dead weights, a hydraulic cylin-
3. Significance and Use der, an air cylinder, or any other device capable of applying the
major load at a slow uniform rate and to an accuracy of 61%.
3.1 This test method is designed to compare related lami-
The major load shall be in addition to the specified preload.
nated composite gasket materials under controlled conditions
Major loads for various types of laminated composite gasket
and their short-time compressibility and recovery at room
materials are shown in Table 1.
temperature. It measures compressibility with a matched pair
of opposing upper and lower penetrators which provide better
5. Test Specimen
precision and bias than methods using an upper penetrator and
5.1 The test specimen may be either circular or rectangular
a lower anvil. It is difficult to prepare undistorted test speci-
in shape. The minimum size shall be 12.7 mm (0.5 in.) larger
mens from laminated composite gasket materials which will
than the penetrator diameter being used, and the maximum size
lay flat on an anvil. Also, with many composites having rigid
shall be 38.1 mm (1.5 in.) larger than it. The thickness shall be
inner layers the load on the upper penetrator is distributed over
that of the laminated composite gasket. Take care that the
specimen is flat, especially around the planned contact point of
the opposing penetrators.
This test method is under the jurisdiction ofASTM Committee F03 on Gaskets
and is the direct responsibility of Subcommittee F03.20 on Mechanical Test
Methods.
Current edition approved Oct. 1, 2003. Published October 2003. Originally Blueprints are available fromASTM Headquarters. Order PCN-12-608060-20.
approved in 1983. Last previous edition approved in 1999 as F 806 – 99a. Alistofrecommendedsuppliers,bySubcommitteeF03.20,isavailablethrough
Annual Book of ASTM Standards, Vol 09.02. ASTM.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
F806–99a (2003)
TABLE 1 Conditioning and Test Loads for Laminated Composite Gasket Materials
NOTE—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 Major Load,
rial in the Nonmetallic First Two Conditioning Procedure Preload,
dure Diameter, mm (in.) N (lbf)
Layers Numerals of Six- N (lbf)
N (lbf) MPa (psi)
Digit Number
A compressed asbestos F11, F12, 1hat100 6 2°C (212 6 3.6°F); 6.4 (0.252) 22.2 (5) 1090 (245) 1112 (250) 34.5 (5000)
sheet; asbestos beater F51, F52 cool in desiccator over anhydrous
sheet; flexible graphite calcium chloride 21 to 30°C (70
to 85°F)
H asbestos paper and F13 4 h at 100 6 2°C (212
...