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Molded Elastomeric Diaphragms are tough, versatile dynamic seals that eliminate virtually all of the limitations associated with other sealing methods like U-cups, O-rings, metal bellows and flat die-cut diaphragms.

Industrial Diaphragms can withstand pressures to 6,000 psi (4.137 bar) over a temperature range from -76oF to 626oF (-60oC to 330oC).

We currently manufacture diaphragms ranging in size from 0.1969" to 29.1339" (5 mm to 740 mm).

Sam Engineers is dedicated to providing rubber seals that enhance the performance and appeal of your product at a price point that helps you compete. Our engineering department stands ready to provide product design support that is both timely and comprehensive.
Molded Diaphragm Advantages:
Best No Leak Seal Long Cycle Life
No Lubrication Effective in harsh environments
Low Friction Constant effective pressure area
Low hysteresis Low assembly / Hardware cost
No Spring Rate Exceptional Sensitivity
No Break Away Friction Ability to operate under severe pressure
Fabric-reinforced diaphragms utilize a layer of an engineered fabric material as part of the diaphragm construction. This layer of fabric gives tremendous design flexibility. A very thin-walled diaphragm can withstand high pressures while remaining very flexible and responsive to minor pressure variations.

Fabrics made of polyester, nylon and silk are commonly used for most applications, with Nomex fabric used for those applications exposed to high-temperature. For those applications that require extremely high-strength.

All types of elastomers, such as, Nitrile, EPDM, Fluorocarbon, Neoprene, Silicone, Fluorosilicone, can be used in the fabric-reinforced diaphragms.
Positive Seal Low Spring Rate
No Lubrication No Breakaway Force
No friction High Strength
Functionality over wide pressure range Low cost
Simple design Versatility
Double coated fabrics    
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.