Solid Metal Gaskets

STYLE 900, 940, 941 and 943


 

Corrugated Metal
Style 900 is a corrugated metal gasket. They are used in low pressure applications where there are limitations of weight and space. The thickness of the sheet should be 0.010 in (0.25 mm) to 0.04 in (1 mm) depending on the metal and number of corrugations. Due to the thickness of the sheet, the force required to seat the gasket is greatly reduced when compared with gasket styles 940 and 941. A minimum of 3 corrugations is necessary to obtain satisfactory sealing. A small flat area on the inside and outside diameters of the gasket is recommended to increase its mechanical strength. The corrugation pitch can vary between 0.045 in (1.1 mm) to 1/4 in (6.4 mm). The total thickness of the gasket is 40% to 50% of the corrugation pitch. The metal used determines the service temperature limit. Maximum service pressure: 500 psi.


Flat Metal
Style 940 is a metallic gasket that has a smooth sealing surface and can be manufactured practically in any shape. Their typical applications are in valves, heat exchangers, hydraulic presses and tongue and groove flanges. The strong points are mechanical and chemical attack resistance and they can be used in elevated temperature and pressure service. The width of the gasket sealing surface should be at least equal to 1.5 times its thickness. These gaskets depending upon their material have high maximum seating stress. The values for the maximum and minimum seating stress are shown in the following table.


 
SEATING STRESS
Material
Seating Stress (MPa)
Minimum Maximum
Temperature Minimum -450 F (-268 C)
Soft Iron 235 525
AISI 1006/1008 235 525
AISI 1010/1020 265 600
AISI 304/316/321 335 750
AISI 309 400 900
Nickel 190 510
Copper 135 300
Aluminum 70 140


Serrated Metal
Style 941 is a flat gasket with concentric grooves. They combine the advantage of the style 940 with a reduced area of contact with the flange to increase the seating stress. It is used when a metallic gasket is required but the available seating force is not enough to seal a style 940. Minimum manufacturing thickness: 3/64 in (1.2 mm).



Jacketed Metal
Style 943. If the service requires the use of style 941 but the flanges need to be protected to avoid being damaged, the 941 gasket can be jacketed.


Edmonton

Hopewell Business Park
#4,  3110-51 Avenue NW
Edmonton, AB   
T6P 0E1

P 780.463.4049
F 780.461.7009
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Calgary

Building B - Bay 25
2419 52 Avenue SE
Calgary, AB     
T2C 4X7

P 403.279.7007
F 403.279.7992
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