Transferring corrosive fluids such as strong acids, alkalis, or solvents is a critical challenge in Indian industries. Ordinary pumps made from metal or elastomers fail quickly due to chemical attack, leading to costly downtime and safety hazards.
Tapflo PTFE pumps offer a reliable and proven solution. Their chemically inert construction, air-operated design, and solid engineering make them ideal for the toughest corrosive duties.
Key Takeaways
- PTFE pumps provide universal resistance to acids, alkalis, and solvents.
- Their non-metallic, leak-free design ensures safe operation.
- Ideal for chemical, surface treatment, and pharmaceutical plants.
- Easy maintenance and long diaphragm life reduce total cost.
What Are PTFE Pumps?
PTFE (polytetrafluoroethylene) pumps are air-operated double diaphragm (AODD) pumps where all wetted parts are made from PTFE or conductive PTFE.
They are designed for aggressive chemicals that attack metals and standard plastics. PTFE’s unique carbon-fluorine molecular bond makes it almost completely non-reactive.
“Tapflo PTFE pumps are trusted for handling aggressive media safely, with minimum maintenance and maximum uptime.”
Tapflo Aftermarket and Service
How PTFE Pumps Work
Compressed air alternately drives two flexible PTFE diaphragms, which create suction and discharge cycles. One diaphragm draws fluid into the chamber while the other pushes fluid out.
Since the pump has no rotating seals or motors, there are no mechanical wear points or potential leak paths.
This simple, air-operated system ensures safe and consistent flow even with highly corrosive liquids.
Why PTFE Pumps Are the Best Choice for Corrosive Fluids
1. Complete Chemical Inertness
PTFE is resistant to nearly all industrial chemicals, including sulphuric acid, nitric acid, sodium hydroxide, and solvents such as acetone or toluene.
This chemical inertness ensures pump integrity even under continuous exposure.
2. Leak-Free, Seal-Less Design
Tapflo PTFE pumps are machined from solid blocks, with no seals, threads, or joints in contact with the fluid. This prevents leaks, fumes, and product contamination.
3. Long-Term Reliability
PTFE diaphragms and bodies resist swelling, cracking, and fatigue. The pump’s design supports years of operation with minimal service needs.
4. Safe Air-Operated Operation
No electric motor or mechanical drive eliminates the risk of sparks or overheating—important for acid and solvent service.
5. Self-Priming and Dry-Run Capability
PTFE pumps can lift liquids up to 5 m when dry and 8 m when wet. They can also run dry temporarily without damage, useful for batch dosing or tank draining.
6. Conductive Versions for ATEX Areas
Conductive PTFE models prevent static build-up, meeting ATEX requirements for flammable and explosive atmospheres.
7. Easy Cleaning and Maintenance
Smooth, non-stick PTFE surfaces minimise residue build-up. Diaphragms and valves can be replaced quickly using basic tools.
8. Versatile Industrial Use
Suitable for handling strong acids, caustics, solvents, and reactive chemicals across multiple sectors.
Typical Technical Details
| Parameter | Typical Range | Notes |
| Max air pressure | 8 bar | standard AODD rating |
| Suction lift | up to 5 m dry, 8 m wet | self-priming |
| pH range | 0–14 | full chemical range |
Applications in India
- Chemical manufacturing – acid, alkali, and solvent transfer
- Surface treatment – pickling, plating, and etching baths
- Pharmaceutical production – cleaning chemicals and reagents
- Water and wastewater – neutralisation and dosing systems
- Battery and recycling plants – acid transfer and recovery
Advantages and Limitations
Advantages
- Universal chemical resistance
- No corrosion or contamination risk
- Safe air operation in hazardous zones
- Low service frequency and quick repair
Limitations
- Higher initial cost than PE pumps
- Not suitable for abrasive slurry transfer
- Flow rate depends on air pressure quality
Installation and Maintenance Tips
- Use PTFE or PVDF fittings and gaskets for full chemical compatibility.
- Ensure clean, dry compressed air with a filter-regulator unit.
- Mount pump securely and ground conductive PTFE models.
- Flush with neutralising liquid after acid transfer.
- Replace diaphragms as per service schedule based on operating hours.
Frequently Asked Questions
1. Can PTFE pumps handle concentrated acids?
Yes, they can handle strong acids safely due to PTFE’s inert chemical structure.
2. Are conductive PTFE pumps available?
Yes, Tapflo offers conductive models for ATEX-rated areas.
3. How long do PTFE diaphragms last?
Typically 12–18 months depending on duty, fluid, and pressure.
4. Are PTFE pumps suitable for solvents?
Yes, they resist swelling and softening in common industrial solvents.
5. Do they need lubrication?
No, the air-operated mechanism requires no oil or grease.
Next Steps
For safe and reliable transfer of corrosive or aggressive chemicals, choose Tapflo PTFE pumps. Our team can guide you on correct sizing, installation, and service kits.
Visit our Aftermarket & Service page for spares, technical support, and maintenance advice.