Diaphragm Guide

Diaphragm’s life not only depends on a diaphragms chemical compatibility with the process fluid but also on the diaphragms ability to flex. Diaphragm life will vary depending on the following factors:

Shelf Life (Rubber Diaphragms Shelf-Life should not be more then 1 Year)
Flex Life (Diaphragm Ability To Flex)
Resistance to Media - Abrasiveness of your process fluid
Pumping Temperature
Size of Diaphragm
Suction Lift Conditions
Initial Cost

The reduction of stress is the key to long diaphragm life.

A nylon fabric mesh is positioned within rubber diaphragms during the molding process to strengthen the diaphragm while dispersing stress.

Molding is done in number of layers. (Similar method of manufacturing tires).

It features a stress-optimized bead shape instead of the traditional disk shape, which results in a lower load exerted on the diaphragm over the course of the pump cycle.

Neo-Flex Diaphragms will give you Guaranteed Longer Life. If longer life is not experienced, Neoflux will send you a new set of Neo-Flex Diaphragms free of charge.

Teflon® is most chemically Inert compound.
One Piece, Rubber with PTFE laminated diaphragms (Traditional Technology) is also available in the market. PTFE lamination is done on rubber diaphragm to support and lengthen the diaphragm life.
Neo-Tef Diaphragm technology is something outside the box.
It incorporates concentric ribs to control the flex pattern of the diaphragm to maximize life.
PTFE by itself has zero memory. A back-up Diaphragm is used to provide support & lengthen the PTFE Diaphragm life.

The TPE Technology

Thermoplastic Diaphragms are molded without fabric reinforcement due to their intrinsic tensile strength.
They have excellent resistance to abrasion.

Diaphragm Testing Methods

Diaphragm Stroke Test
(Tested upto Intermittent Test of 6 Million Cycles).
Diaphragm Rapture Test
(Applying the pressure @ 8.6 BAR under dead head situation)
Abrasive Resistance Test
(Transfer of Water containing Razor Sharp Metal Chips)
Temperature Test
(Transfer of Glycerin @ 120°C)
Destructive Test

COMPOUND	DESCRIPTION	TEMPERATURE LIMITS	SUITABLE APPLICATION
Neoprene	Black	-18°C to 93°C	A low cost general-purpose diaphragm for non-aggressive applications such as water -based slurries, well water or sea water. Excellent flex life.
Buna-n®	Black (with red dot)	-12°C to 82°C	Low cost diaphragm for petroleum/oil- based fluids such as leaded gasolines, fuel oils,non-synthetic hydraulic oils, kerosene, turpentine & motor oils.
EPDM	Black	-51°C to 138°C	Good flex life at extremely low temperatures. Also be used as a low cost alternative for pumping dilute acids or caustics.
Viton®	Green	-40°C to 177°C	Good flex life at extremely high temperatures. It can also be used with aggressive fluids such as aromatic or chlorinated hydrocarbons and highly aggressive acids. PTFE would normally be used with these aggressive fluids as its flex life is better than Viton®. However, in applications involving suction lift outside the range of PTFE, Viton® will be the preferred choice for highly aggressive fluids.
Polyurethane	Natural	-12°C to 66°C	An excellent general purpose diaphragm for use in non aggressive applications. This material exhibits exceptional flex life and durability. Suitable for Healthcare & Food industry.
PTFE	Milk White	-4°C to 104°C	Suitable for abrasive nature of fluid such as aromatic or chlorinated hydrocarbons, acids, caustics, ketones and acetates. Exhibits good flex life compared to a standard rubber diaphragm.

Please verify chemical resistance guide of elastomers and all other pump components prior to installation.
Consult Neoflux for professional guidance.

Viton® & Teflon® are registered trademark DuPont Dow Elastomers.