ASTM F36-15(R2021) pdf free download

ASTM F36-15(R2021) pdf free download.Standard Test Method for Compressibility and Recovery of Gasket Materials
1.1 This test method covers determination of the short-time compressibility and recovery at room temperature of sheet- gasket materials, form-in-place gaskets, and in certain cases, gaskets cut from sheets. It is not intended as a test for compressibility under prolonged stress application, generally referred to as “creep,” or for recovery following such pro- longed stress application, the inverse of which is generally referred to as “compression set.” Also, it is not intended for tests at other than room temperature. A resiliency characteristic (the amount recovered expressed as a percentage of the compressed thickness) may also be calculated from the test data where desired.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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 appro- priate safety, health, and environmental practices and deter- mine the applicability ofregulatory limitations prior to use.
1.4 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
3.1.5 Loading Device—A device for applying a specified major load to the upper end of the penetrator, which may consist of an arrangement of dead weights, a hydraulic cylinder, an air cylinder, or any other device capable of applying the major load at a slow uniform rate and to an accuracy of 61 %. The major load shall be in addition to the specified preload. Major loads for various types of gasket materials are as shown in Table 1, unless otherwise specified.
The test specimen shall consist ofa single ply or a number of superimposed plies sufficient to give a minimum nominal thickness of 1.6 mm ( 1 ⁄ 16 in.) 5 for all materials except cork composition, cork and rubber materials, and cork and cellular rubber materials, for which the minimum nominal thickness shall be 3.2 mm ( 1 ⁄ 8 in.). If applied to specimens outside of the test thicknesses, the results shall be regarded merely as indicative. For specification purposes, agreement on compress- ibility and recovery figures shall be reached between producer and consumer for those materials whose thickness in a single ply or multiple plies does not fall within the tolerances of the two nominal thicknesses specified. The tolerances for the test thicknesses are listed in Classification F104, Table 3. The specimen shall contain no joint or separation within the minimum test area.
4.2 The test specimen for Procedure L, as described in Table 1, shall be at least two in. long and wider than the penetrator used for the test. It shall consist of a single ply and contain no joint or separation. No thickness tolerances are given for gaskets covered by this procedure. Test results shall be regarded merely as indicative.
5.1 Specimens shall be conditioned as specified for the particular type of material. Conditioning procedures for vari- ous types of gasket materials are as shown in Table 1, unless otherwise specified.
5.2 If a mechanical means of maintaining 50 to 55 % relative humidity is not available, a tray containing a saturated solution ofreagent grade magnesium nitrate (Mg(NO 3 ) 2 ·6H 2 O) shall be placed in the chamber to provide the required relative humidity. In all cases where testing is conducted outside the area of specified humidity, specimens shall be removed from the chamber one at a time as needed.
7.2 Center the test specimen upon the anvil and apply the preload and maintain for a period of 15 s, and record the preloaded thickness of the specimen. Immediately apply the major load in a slow uniform manner so that the total load is attained within 10 s. Guide the penetrator in its descent so that the surface remains parallel to the surface of the anvil. Maintain the total load for a period of 60 s, and record the thickness ofthe specimen. Immediately remove the major load, and after a period of 60 s record the thickness of the specimen under the original preload. This is the recovered thickness.