Non Metallic Gasket

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Flange gaskets are highly engineered products, and their performance depends on many factors. Certainly design, manufacture, installation, and process conditions are all critical, but so is storage before use. Gasket materials often remain in storage for a long time before they are placed into service. Unfortunately, storage practices for gasket materials are generally not optimal or controlled well enough. This article provides guidance for the storage of different gasket materials to preserve their integrity.

non-metallic-gasket

Gasket materials are divided into three main categories: non-metallic, semi-metallic and metallic. Non-metallic gaskets, or soft gaskets, are fabricated from materials such as rubber, fiber, polytetrafluoroethylene (PTFE) and graphite. The material properties make them ideal for flat-faced applications with low pressures. Metallic gaskets are fabricated from one or a combination of metals. Semi-metallic gaskets are composed of metal and non-metallic materials. The metal is intended to offer strength and resilience while the non-metallic components provide conformability and sealabililty. These types of gasket are used in higher-pressure applications. The most common semi-metallic gaskets are spiral wound gaskets.

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NPS d1
(ID)		 d2 (GASKET OUTSIDE DIAMETER)
Class 150 Class 300 Class 400 Class 600 Class 900
1/2 21 48 54 54 54 64
3/4 27 57 67 67 67 70
1 33 67 73 73 73 79
1¼ 42 76 83 83 83 89
1½ 48 86 95 95 95 98
2 60 105 111 111 111 143
2½ 73 124 130 130 130.2 165
3 89 137 149 149 149 168
3½ 102 162 165 162 162 …
4 114 175 181 178 194 206
5 141 197 216 213 241 248
6 168 222 251 248 267 289
8 219 279 308 305 321 359
10 273 340 362 359 400 435
12 324 410 422 419 457 498
14 356 451 486 483 492 521
16 406 514 540 537 565 575
18 457 549 597 594 613 638
20 508 606 654 648 683 699
24 610 718 775 768 791 838

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