verniers2

Gasket Materials and Contact Facings

Gasket factors (m) for Operating Conditions and Minimum Design Seating Stress (Y)

Gaket MaterialGasket

factor

(m)		Minimum

design

seating

Stress(Y)

(psi)		Sketches

and

Notes
Seating Width

(See Table)
Gasket

Group		Column
Self-Energizing Types

O-rings, metalicelastomer, and other gasket types considered as self-sealing		00   
Elastomers without fabric

Below 75A Shore Durometer

75A or higher Shore Durometer		0.50

1.00		0

200

(1a), (1b),

(1c),

(1d),

(4),

(5)

ll
Elastomers with cotton fabric insertion1.25400
Vegetable fibre1.751100
Flexicarb based prod uctsMRG

Flexpro

NR

SR

ST		2.00

2.00

2.00

2.00

2.00		2,500

2,500

2,500

2,500

2,500		  
Spiral wound metal, with filter graphite filler3.0010,000(1a), (1b)
Spiral wound metal with PTFE filler3.005,000  
Corrugated metal

with filler

or

Corrugated metal jacketed

with filler		Soft aluminum

Soft copper or brass

Iron or soft steel

Monel or 4%-6% chrome

Stainless steels & Nickel based alloys		2.50

2.75

3.00

3.25

3.50		2900

3700

4500

5500

6500		(1a), (1b)
Corrugated metalSoft aluminium

Soft copper or brass

Iron or soft steel

Monel or 4%-6% chrome

Staimless steel based alloys		2.75

3.00

3.25

3.50

3.75		3700

4500

5500

6500

7600		(1a), (1b),

(1c), (1d)
Flat metal jacketed,

with filler		Soft aluminium

Soft copper or brass

Iron or soft steel

Monel

4%-6% chrome

Stainless steels & Nickel based alloys		3.25

3.50

3.75

3.50

3.75

3.75		5500

6500

7600

8000

9000

9000		(1a), (1b),

(1c),

(1d),

(2)
Grooved metalSoft aluminium

Soft copper or brass

Iron or soft steel

Monel or 4%-6% chrome

Stainless steels & Nickel based alloys		3.25

3.50

3.75

3.75

3.25		5500

6500

7600

9000

10100		(1a), (1b),

(1c),

(1d),

(2),

(3)
Solid flat metalSoft aluminium

Soft copper or brass

Iron or soft steel

Monel or 4%-6% chrome

Stainless steels & Nickel based alloys		4.00

4.75

5.50

6.00

6.50		8800

13000

18000

21800

26000		(1a), (1b),

(1c),

(1d),

(2),

(3),

(4),

(5)
l
Ring jointIron or soft steel

Monel or 4%-6% chrome

Stainless steels & Nickel based alloys		5.50

6.00

6.50		18000

21800

26000		(6)

Notes:

This table gives a list of many commonly used gasket materials and contact facings with suggested design values of m and y that have generally proved satisfactory in actual service when using effective gasket seating width b given in the table following. The design values and other details given in this table are suggested only and are not mandatory.

The surface of a gasket having a lap should not be against the nubbin.

Effective Gasket Seating Width - See Note (1)

Notes:

(1) The gasket factors listed only apply to flanged joints in which the gasket is contained entirely within the inner edges of the bolt holes.

(2) Where serrations do not exceed 1/64" depth and 1/32" width spacing, sketches (1b) and (1d) shall be used.

 

 

 

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