Double Jacketed Gaskets


A Jacketed Gasket is comprised of a soft pliable core inside a metallic jacket.

Nowadays many double jacketed gaskets are already substituted by higher end kammprofile gaskets.

Metallic Jacket

Almost any metal or alloy found in sheet form can be used as a jacket; its choice must take into consideration the fluid to be sealed. The metallic jacket is 0.016 in (0.4mm) to 0.020 in (0.5mm) thick.


The following recommendations are based on successful practical applications: Gaskets confined by the inside and outside diameters:Gasket inside diameter = groove inside diameter plus 1/16 in (1.6 mm).

  • Gasket outside diameter = groove outside diameter less 1/16 in (1.6 mm).

Gaskets confined by outside diameter:

  • Gasket inside diameter = flange inside diameter plus a minimum of 1/8 in (3.2 mm).
  • Gasket outside diameter = groove outside diameter less 1/16 in (1.6 mm).

Non confined gaskets:

  • Gasket inside diameter = flange inside diameter pIus 1/8 in (3.2 mm).
  • Gasket outside diameter = bolt circle diameter less bolt diameter.


The standard filler material is Flexible Graphite. Other fillers like ceramic, PTFE or another metal (corrugated, flat, or serrated) can be used.


Style 923 and 927

Style 923 (Figure 1) is a flat double jacket gasket. Its most typical applications are in Heat Exchangers. ASME B 16.20 shows the gasket dimensions for ANSI B 16.5 flanges. The standard thickness is 1/8 in (3.2 mm). This style is also used in large size reactors in chemical plants. Another important use is for flanges in the large, low pressure ducting in Steel Mill Blast Furnaces. To compensate for distortions and irregularities of these flanges gaskets have a thickness from 5/32 in (4 mm) to 1/4 in (6 mm).

Style 927 (Figure 2) is similar to style 923 with the addition of flexible graphite facing.






Style 920

Style 920 is a round single jacket gasket. Used in applications where the seating stress and width are limited. It can be manufactured in circular or oval shape. The maximum gasket width is 1/4 (6.4 mm) and the standard thickness is 3/32 in (2.4 mm).

Style 926

Style 926 is similar to style 923 but the metallic jacket is corrugated. The corrugations act as a labyrinth. The filler material is typically flexible graphite, or other soft materials.

Style 929

Style 929 is similar to style 926 with a corrugated metallic filler. Used in applications where it is necessary to have a gasket without non-metallic materials, temperature limits and chemical resistance depend uponthe limits of the metal only.

“M” and “y” Value

StyleGasket Materia"m""y"(psi)
Style 920, 923 Iron or Soft Steel 3.75 7600
Monel 3.50 8000
Stainless Steels 3.75 9000
Style 926 Iron or soft steel 3.00 4500
Monel or 4-6% chrome 3.25 5500
Stainless Steels 3.50 6500
Style 929 Any Metal with FG Facing* 3.5 6500

Double Jacketed Gaskets Datasheet





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