**Sigraflex M&Y Factors**

**Y, Yield Factor **The factor that
represents the minimum load over the contact area of the gasket that is required
to provide a sealed joint, with no pressure in the assembly ( i.e. seating
stress).

**Y, Factor Determination **Determine
the leak rate versus bolt load with 2 psi of nitrogen or water in the system,
using increasing bolt loads to develop a load versus leak rate curve.

**
Y = Fastener Force ÷ Gasket Contact Area**

**M, Maintenance Factor **The factor that
provides the additional preload capability in the flange fasteners to maintain
sealing pressure on the gasket after internal pressure is applied.

**M, Maintenance Factor Determination **Use
decreasing bolt load and 300 psi internal pressure to calculate and plot **M
**versus** **leak rate. Choose an **M **that yields an acceptable leak
rate.

**
M = (Fastener Force - P x A _{internal})_{
}÷ PxA_{gasket}**

**
Required Bolt Force = **greater of : **Y x A _{gasket}**

_{
or}

**
P x A _{internal }÷ M x P x (2b x 3.14 G)**

Where** b = effective gasket width **and** G = gasket OD**

**
**

**
M & Y Factors for Sigraflex Materials**

**Homogeneous grades and solid foil core laminates (i.e,
B-Lam, Bssc, BMY. etc.)**

**Y = 900, M = 2**

**Tang core and screen core laminates (i.e. BTCSS, BSC)**

**Y= 2500, M = 2**

This information is based on SGL's current knowledge and is intended to provide general notes on our products and their uses. It should not therefore be construed as guaranteeing specific properties of the products described or their suitability for a particular application. Any existing industrial property rights must be observed. The quality of our products is guaranteed under SGL General Conditions of sale |