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25.1 DEFINITION
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A gasket is a material or combination of materials clamped between two separable members of a mechanical joint. Its function is to effect a seal between the members (flanges) and maintain the seal for a prolonged period. The gasket must be capable of sealing mating surfaces, must be impervious and resistant to the medium being sealed, and must be able to withstand the application temperature. Figure 25.1 depicts the nomenclature associated with a gasketed joint.
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25.2 STANDARD CLASSIFICATION SYSTEM FOR NONMETALLIC GASKET MATERIALS
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This classification system provides a means for specifying or describing pertinent properties of commercial nonmetallic gasket materials. Materials composed of
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Ref. [25.1] (ANSI/ASTM F104).
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25.1 Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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GASKETS 25.2
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FASTENING, JOINING, AND CONNECTING
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FIGURE 25.1 Nomenclature of a gasketed joint.
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asbestos, cork, cellulose, and other organic or inorganic materials in combination with various binders or impregnants are included. Materials normally classified as rubber compounds are not included, since they are covered in ASTM Method D 2000 (SAE J200). Gasket coatings are not covered, since details are intended to be given on engineering drawings or in separate specifications. This classification is based on the principle that nonmetallic gasket materials can be described in terms of specific physical and mechanical characteristics. Thus, users of gasket materials can, by selecting different combinations of statements, specify different combinations of properties desired in various parts. Suppliers, likewise, can report properties available in their products. In specifying or describing gasket materials, each line call-out shall include the number of this system (minus the date symbol) followed by the letter F and six numerals, for example, ASTM F104 (F125400). Since each numeral of the call-out represents a characteristic (as shown in Table 25.1), six numerals are always required. The numeral 0 is used when the description of any characteristic is not desired. The numeral 9 is used when the description of any characteristic (or related test) is specified by some supplement to this classification system, such as notes on engineering drawings.
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25.3 GASKET PROPERTIES, TEST METHODS, AND THEIR SIGNIFICANCE IN GASKETED JOINTS
Table 25.2 lists some of the most significant gasket properties which are associated with creating and maintaining a seal. This table also shows the test method and the significance of each property in a gasket application.
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
GASKETS 25.3
GASKETS
25.4 PERMEABILITY PROPERTIES
For a material to be impervious to a fluid, a sufficient density to eliminate voids which might allow capillary flow of the fluid through the construction must be achieved. This requirement may be met in two ways: by compressing the material to fill the voids and/or by partially or completely filling them during fabrication by means of binders and fillers. Also, for the material to maintain its impermeability for a prolonged time, its constituents must be able to resist degradation and disintegration resulting from chemical attack and temperature of the application [25.2]. Most gasket materials are composed of a fibrous or granular base material, forming a basic matrix or foundation, which is held together or strengthened with a binder.The choice of combinations of binder and base material depends on the compatibility of the components, the conditions of the sealing environment, and the load-bearing properties required for the application. Some of the major constituents and the properties which are related to impermeability are listed here. 25.4.1 Base Materials Nonmetallic Cork and Cork-Rubber. High compressibility allows easy density increase of the material, thus enabling an effective seal at low flange pressures. The temperature limit is approximately 250 F (121 C) for cork and 300 F (149 C) for cork-rubber compositions. Chemical resistance to water, oil, and solvents is good, but resistance to inorganic acids, alkalies, and oxidizing environments is poor. These materials conform well to distorted flanges. Cellulose Fiber. Cellulose has good chemical resistance to most fluids except strong acids and bases. The temperature limitation is approximately 300 F (149 C). Changes in humidity may result in dimensional changes and/or hardening. Asbestos Fiber. This material has good heat resistance to 800 F (427 C) and is noncombustible. It is almost chemically inert (crocidolite fibers, commonly known as blue asbestos, resist even inorganic acids) and has very low compressibility. The binder dictates the resistance to temperature and the medium to be sealed. Nonasbestos Fibers. A number of nonasbestos fibers are being used in gaskets. Some of these are glass, carbon, aramid, and ceramic. These fibers are expensive and are normally used only in small amounts. Temperature limits from 750 to 2400 F (399 to 1316 C) are obtainable. Use of these fillers is an emerging field today, and suppliers should be contacted before these fibers are specified for use. 25.4.2 Binders and Fillers Rubber. Rubber binders provide varying temperature and chemical resistance depending on the type of rubber used. These rubber and rubberlike materials are used as binders and, in some cases, gaskets: 1. Natural This rubber has good mechanical properties and is impervious to water and air. It has uncontrolled swell in petroleum oil and fuel and chlorinated solvents. The temperature limit is 250 F (121 C).
Downloaded from Digital Engineering Library @ McGraw-Hill (www.digitalengineeringlibrary.com) Copyright 2004 The McGraw-Hill Companies. All rights reserved. Any use is subject to the Terms of Use as given at the website.
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