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Coated Fabrics for Diaphragms

Many diaphragm applications require that the rolling diaphragms be coated with rubber on both sides, commonly referred to as "double-coat" diaphragms. This type of rolling diaphragm is typically required when the application sees pressure on both sides of the diaphragm in two ways:

First, we utilise our proprietary double-coat moulding process, we are able to provide double-coat diaphragms directly from rubber and fabric.

Second, we develop and maintain an inventory of standard "coated-fabrics", that is, fabric that is coated on both sides by a sub-contractor using a variety of materials. The selection of the proper double-coat process and materials requires an understanding of both the rubber and fabric used in its fabrication as well as the overall geometry of the rolling diaphragm. DiaCom technical personnel are available to assist in the proper selection of coated fabric.

Coated Fabrics Chart

DiaCom
Material
Designation
Fabric Style
Fabric
Gauge
(Inches)
Fabric
Gauge
(mm)
Maximum
Operating Temperature
Fabric
Tensile
Strength
(lb.)
General Physical Properties
FCDA-1015
FCGB-1330
FCGB-1730
Viton-Coated Polyester
Nitrile-Coated Nylon
Nitrile-Coated Nylon
.0090-.0120
.2794-.3810
.0150-.0190
.2286-.3048
.2794-.3810
.3810-.4826
302°F (150°C)
250°F (120°C)
250°F (120°C)
50
150
65
Medium duty, good chemical resistance
Medium duty, good formability, high strength, good formability
General purpose, medium strength
FCGB-8522
FCGD-0602
FCGE-1032
Nitrile-Coated Nylon
Nitrile-Coated Silk
Nitrile-Coated Cotton
.0820-.0900
.0058-.0075
.0080-.0120
2.0828-2.2860
0.1473-1.1905
0.2032-.3048
250°F (120°C)
212°F (100°C)
302°F (150°C)
350
35
35
Heavy gauge, moderate to light pressure applications, Wide application use
Ultra sensitive, fuel resistant, medium duty, good formability
Medium duty
FCGE-6201
FCGE-2509
FCMB-1252
Nitrile/PVC Coated Cotton
Nitrile on Nylon
Nitrile - Coated Nylon
.057-.067
.023-.027
.113-.137
1.4478-1.7018
.584-.686
2.870-3.480
302°F (150°C)
200°F (93°C)
250°F (120°C)
35
300
275
Moderate to high pressure applications, Excellent in oils/fuels
Moderate to high pressure applications
Moderate to high pressure applications

 

 

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