TYPICAL FABRIC CHARACTERISTICS
The wide variety of fabrics and elastomers available makes it possible to design a diaphragm for operation over a broad range of conditions. The selection of the correct fabric construction is dependent upon the design of the part and operating conditions. Critical factors include sensitivity, working pressures, distance and rate of diaphragm travel, temperature, smoothness of flange areas, flange pressures and working environment. The chart below provides information to help you select the optimal material for your needs.
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Property
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COTTON
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NYLON
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POLYESTER
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GLASS
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PTFE
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NOMEX*
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|
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vegetable fiber
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polyamide fiber
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fiber
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fluorocarbon fiber
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aramid fiber
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Tensile Strength
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Medium
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Excellent
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High
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Very High
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Medium
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Excellent
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|
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Elongation
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Low
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Medium
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Medium
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Very Low
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Medium
|
Medium
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|
|
Electrical Insulation Properties
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Fair
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Very Good
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Very Good
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Excellent
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Excellent
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Very Good
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|
|
Resistance to:
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Aging
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Good
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Good
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Good
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Excellent
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Excellent
|
Good
|
|
|
Moisture
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Fair
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Very Good
|
Excellent
|
Excellent
|
Excellent
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Very Good
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|
|
Heat Degradation
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Good
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Very Good
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Excellent
|
Excellent
|
Excellent
|
Excellent
|
|
|
Mildew
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Poor to Fair
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Good
|
Good
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Excellent
|
Excellent
|
Good
|
|
|
Strong Acid
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Poor
|
Poor
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Fair to Good
|
Poor
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Excellent
|
Poor
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|
|
Weak Acid
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Poor
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Fair
|
Good
|
Fair
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Excellent
|
Fair
|
|
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Strong Alkali
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Excellent
|
Good
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Fair
|
Poor
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Excellent
|
Good
|
|
|
Weak Alkali
|
Excellent
|
Excellent
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Fair to Good
|
Fair
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Excellent
|
Good
|
|
|
Organic Solvents
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Excellent
|
Good
|
Good
|
Excellent
|
Excellent
|
Good
|
|
|
Flammability
|
Poor
|
Fair
|
Fair
|
Excellent
|
Excellent
|
Good
|
|
| Comparative Cost | Moderate | Moderate | Moderate | Low | High | High |