PUMP DIAPHRAGMS
What should you consider when choosing the right pump diaphragms material?
- Chemical resistance
- Estimated flex life
- Cost
- Abrasion resistance
- Temperature limitations
MAXIMUM LIQUID TEMPERATURE OF PUMP DIAPHRAGMS
| Pump Material | Temperature |
|---|---|
| Polypropylene (PPG) | 82℃ (180℉) |
| Groundable Kynar® (PVDF) | 100℃ (212℉) |
| Groundable Acetal (POM) | 82℃ (180℉) |
| Aluminum (ADC-12) | 100℃ (212℉) |
| Stainless Steel (316) | 100℃ (212℉) |
*The maximum liquid temperature for metal and Kynar®-fitted pumps is determined by the elastomer (diaphragm material). Polypropylene pumps have a maximum liquid temperature of 82℃ (180℉) regardless of diaphragm material.
* Please note that excessive inlet pressure or excessive suction lift can shorten diaphragm life.
| Diaphragm Material | Temperature |
|---|---|
| Neoprene (CR) | 82℃ (180℉) |
| Buna N (NBR) | 82℃ (180℉) |
| Nordel® (EPDM) | 100℃ (212℉) |
| Hytrel® (TPEE) | 120℃ (248℉) |
| Santoprene (TPO) | 100℃ (212℉) |
| Viton® Fluoroelastomer (FKM) | 120℃ (248℉) |
| Teflon® (PTEE) | 100℃ (212℉) |
RUBBER COMPOUNDS
Neoprene (CR)
- Identifcation: dull black with no color dot
- Temperature range: -18°C to 82°C
- Excellent for non-corrosive abrasive applications.
Buna-N (NBR)
- Identifcation: black with a red or pink dot
- Temperature range: -12°C to 82°C
- Excellent for petroleum based fluids.
Nordel® (EPDM)
- Identifcation: black with green dot
- Temperature range: -40°C to 100°C
- Excellent for low temperatures, caustics and some acids. FDA Compliant EPDM Material (must be specifed).
Viton® (FKM)
- Identifcation: black with silver or blue dot
- Temperature range: -29°C to 120°C
- Excellent for aggressive fluids and high temperature applications.
THERMOPLASTIC COMPOUNDS
Hytrel® (TPEE)
- Identifcation: Tan/Cream Thermoplastic
- Temperature Range: -18°C to 120°C
- Excellent general-purpose diaphragm for non-corrosive abrasive applications and high-flex life. FDA compliant material.
Santoprene® (TPO)
- Identifcation: Black Thermoplastic
- Temperature Range: -23°C to 100°C
- Excellent for acids or caustics with a very high flex life.
Teflon® (PTFE)
- Identifcation: White Thermoplastic
- Temperature Range: 4,5°C to 100°C
- Excellent choice for pumping highly aggressive fluids, including solvents.
BONDED DIAPHRAGMS
TU® (PTFE with EPDM backing)
This so-called high-performance easy to clean PTFE diaphragm is gaining its place in the paint, ink and printing industry for over 15 years. In this 24/7 industry, this TU® diaphragm has proved its dependability. This PTFE diaphragm with high flexibility is at least 3 times greater estimated life span than standard PTFE diaphragms. Standard diaphragms have thread, nuts and center disks inside the liquid area. The TU® diaphragm is equipped with the rod connector only on the air-side and an easy-to-clean liquid surface. This means that no paint or ink residues will build up between the center disks, bolts and so on. this will prevent color contamination.
NORTHSTAR AODD PUMPS & PARTS SUPERMARKET
We mainly provide high quality replacement parts to match the brand ARO®, Wilden®, Sandpiper®, VERSA-MATIC® & SEKO®. If you have any procurement requirements, please contact us.
Check here for more AODD pumps and parts.