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, by utilizing our proprietary double-coat molding process, we are able to provide double-coat diaphragms directly from rubber and fabric.

Second, by developing and maintaining 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. Dia•Com technical personnel are available to assist in the proper selection of coated fabric.

Dia•Com Material Designation	Fabric Style	Fabric Gauge (Inches)	Fabric Gauge (mm)	Maximum Recommended Operating Temperature	Fabric Tensile Strength (PSI)	Fabric Tensile Strength (BAR)	General Physical Properties
FCDA-1015 FCGB-0806 FCGB-1325	Viton-Coated Polyester Nitrile-Coated Nylon Nitrile-Coated Nylon	.0090-.0120 .0075-.0085 .0110-.0150	.2286-.3048 .1905-.2159 .2794-.3810	302°F (150°C) 250°F (120°C) 250°F (120°C)	50 150 150	.0345 .1034 .1034	Medium duty, good chemical resistance Medium duty, good formability Medium duty, good formability
FCGB-1330 FCGB-5038 FCGB-8513	Nitrile-Coated Nylon Nitrile-Coated Nylon Nitrile-Coated Nylon	.0110-.0150 .0470-.0530 .0820-.0900	.2794-.3810 1.1938-1.3462 2.0828-2.2860	250°F (120°C) 250°F (120°C) 250°F (120°C)	150 350 350	.1034 .2413 .2413	Medium duty, good formability High strength, good formability High strength, limited formability
FCGD-0600 FCGE-1032 FCMB-1326	Nitrile-Coated Silk Nitrile-Coated Cotton Neoprene-Coated Nylon	.0050-.0065 .0080-.0120 .0010-.0150	.1270-.1651 .2032-.3048 .0254-.3810	212°F (100°C) 302°F (150°C) 250°F (120°C)	28 55 150	.0193 .0379 .1034	Ultra sensitive, fuel resistant Medium duty, good formability Medium duty, good formability

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