Wilden Diaphragm Materials

The Right Diaphragm Solution for Every Application

Wilden Elastomer Diaphragm Technology

Wilden® has refined Air-Operated Double-Diaphragm (AODD) pump diaphragm technology with major innovation breakthroughs, extensive destructive testing and comprehensive critical analysis. As a result, Wilden has taken diaphragm science beyond yesterday’s standards to bring you more durable products that will reliably stand up to oil, chemicals, acids and other aggressive fluids. Wilden has also focused on sanitary applications by pioneering new hygienic, FDA-compliant diaphragms with enhanced flex life and durability for significant savings in labor and downtime.

Following is an overview of the families of available diaphragm materials for use with Wilden AODD pumps. Always consult a Wilden distributor for guidance in determining chemical compatibility and temperature limits for specific applications using Wilden diaphragms.

Wilden Rubber Diaphragms, AODD pumps, AODD diaphragms, air operated double diaphragm, Wilden diaphragm

Rubber Diaphragms

Wilden uses various compounds that consist of natural rubber and man-made additives to increase the compounds’ resistance to specific types of fluids. Rubber diaphragms provide the greatest temperature spans as well as long flex life and are specifically engineered to significantly increase chemical resistance. These diaphragms have exceptional durability from integral nylon fabric mesh.

Neoprene

  • Exceptional general-purpose diaphragm
  • Low cost
  • Good flex life and moderate abrasion resistance
  • Perfect for nonaggressive applications such as water-based slurries, well water or seawater

Buna-N

  • Excellent for applications involving petroleum/oil-based fluids such as:
    • Leaded gasoline
    • Fuel oils
    • Kerosene
    • Turpentine
    • Motor oils
  • Available options comply with FDA standards for food processing
  • Moderate flex life and abrasion resistance

EPDM

  • Low-cost alternative for dilute acids and caustics
  • Good flex life and moderate abrasion resistance
  • Available options comply with FDA standards for food processing
  • Perfect for extremely cold temperatures

Viton®

  • Excellent for extremely hot temperatures
  • Exceptional performance with aggressive fluids such as:
    • Aromatic or chlorinated hydrocarbons
    • Strong, aggressive acids
  • Recommended for harsh chemicals outside the temperature range of PTFE
  • Moderate flex life and abrasion resistance

PTFE Diaphragms

Wilden PTFE Diaphragms Family, AODD pumps, AODD diaphragms, air operated double diaphragm, Wilden diaphragm

Wilden was the first air-operated double-diaphragm pump manufacturer to offer PTFE diaphragms. Wilden continues to offer this original PTFE diaphragm which features a reduced stroke and reduced displacement to minimize abrasive contact with the pump housing to provide long flex life.

  • Preferred choice for highly aggressive fluids such as aromatic or chlorinated hydrocarbons, acids, caustics, ketones and acetates
  • Excellent flex life and good abrasion resistance
  • Complies with FDA standards for food processing and USP requirements for pharmaceutical use
  • Also available as an Integral Piston Diaphragm (IPD) for faster, easier cleaning and installation

Thermoplastic Elastomer (TPE) Diaphragms

Wilden Thermoplastic Diaphragms, AODD pumps, AODD diaphragms, air operated double diaphragm, Wilden diaphragm

TPE Diaphragms are durable, low cost and operate over a wide temperature range. Injection-molded of man-made elements, TPE diaphragms have inherent tensile strength without the need for fabric reinforcement.

Polyurethane

  • Excellent for general purpose use in non-aggressive applications
  • Exceptional flex life and durability
  • Great for water-based slurries, well water and seawater
  • Wilden’s least expensive diaphragm

Wil-Flex

  • Low-cost alternative to PTFE with cost comparable to neoprene
  • For acidic and caustic applications such as sodium hydroxide, sulfuric or hydrochloric acids
  • Excellent flex life, abrasion resistance and durability
  • Available options comply with FDA standards for food processing
  • Made of Santoprene™
  • Also available as a full-stroke-length Integral Piston Diaphragm (IPD) for easy installation and cleaning

Saniflex

  • Outstanding sealing of low specific gravity and highly lubricious materials
  • Excellent abrasion resistance and good flex life
  • Available options comply with FDA standards for food processing
  • Made of Hytrel®
  • Also available as part of the Wilden’s EZ-Install flex-profile diaphragm line

Geolast®

  • Enhanced oil-resistance
  • Exceptional performance with a variety of fluids
  • Good abrasion resistance and moderate flex life
  • Equivalent to nitrile (Buna-N)

Hytrel® and Viton® are registered trademarks of DuPont.
Geolast® and Santoprene® are registered trademarks of ExxonMobil.

Diaphragm Compatibility

Wilden Diaphragm Chemical Compatability Chart, AODD pumps, AODD diaphragms, air operated double diaphragm, Wilden diaphragm

Diaphragm Size Availability 

Wilden Diaphragms pump size table

Download the Wilden Diaphragms Brochure