Which Liquids May Be Compatible with a PPS, PTFE, and FFKM Micro Liquid Pump?

You selected a pump with premium materials like PPS, PTFE, and FFKM, expecting bulletproof chemical resistance for your new inkjet printer or medical analyzer. Yet, the pump failed, causing leaks and project delays, leaving you questioning the datasheet.

The problem is that material resistance charts don't tell the whole story. A pump's true compatibility depends on the entire fluid path, the exact chemical formulation of your ink or reagent, and your specific operating conditions like temperature and pressure.

A micro liquid pump with a PPS pump head, PTFE diaphragm, and FFKM valves may be compatible with many liquids used in inkjet printing, medical diagnostics, and laboratory analysis, including reagents, buffers, cleaning solutions, and some inks. Final compatibility depends on the exact chemical formulation, concentration, temperature, exposure time, operating pressure, and complete wetted-fluid path. As a Micro Pump Project Specialist at BODENFLO, I've seen firsthand that relying on material names alone is a common and costly mistake, especially in these high-value applications.

What Is a PPS–PTFE–FFKM Micro Liquid Pump?

You see these acronyms and might assume "PPS-PTFE-FFKM" is a specific type of pump technology. This can lead to flawed comparisons, as these letters describe the materials, not the pump's mechanical design.

A PPS–PTFE–FFKM pump is a micro diaphragm pump where the primary wetted components are made from Polyphenylene Sulfide (PPS), Polytetrafluoroethylene (PTFE), and Perfluoroelastomer (FFKM). These materials are chosen for their potential chemical resistance in demanding applications.

These three materials form the core of the fluid path.

PPS Pump Head

The pump head, made from PPS (Polyphenylene Sulfide), is the main chamber that contains and directs the liquid through its ports. PPS is often chosen for its excellent mechanical strength, rigidity at high temperatures, and broad resistance to many industrial chemicals. However, its actual performance can vary with the specific PPS grade, the presence of reinforcements like glass fiber, operating temperature, and the duration of chemical exposure.

PTFE Diaphragm

The diaphragm, made from PTFE, is the flexible component that moves back and forth to create the pumping action. PTFE is famous for its nearly universal chemical resistance and non-stick surface. It's important to confirm the diaphragm's construction—is it solid PTFE, a PTFE-coated elastomer, or a laminated material? Both its chemical inertness and its mechanical flex life are critical for long-term performance.

FFKM Inlet and Outlet Valves

The small check valves, which control the direction of flow, are often made from FFKM. This material provides the elasticity needed for a valve to seal properly while offering chemical resistance that approaches that of PTFE. FFKM is a family of materials, not a single compound. The specific grade determines its true chemical resistance, temperature limits, and fatigue life.

Component	Function	Main Evaluation Point
PPS Pump Head	Contains and directs the liquid	Chemical attack, stress, and temperature
PTFE Diaphragm	Displaces the liquid	Chemical resistance, construction, and flex life
FFKM Valves	Control liquid direction	Swelling, flexibility, sealing, and fatigue
Fittings	Connect to the system	Full chemical and temperature compatibility

Why Can't Compatibility Be Confirmed by Material Names Alone?

You checked a resistance chart, and it gave all three materials an "Excellent" rating for your chemical. So why did the pump still leak after a week of operation?

A material resistance chart tests a static piece of material, not a dynamic pump. A pump introduces mechanical stress, pressure cycling, and temperature changes that can cause a "resistant" material to fail.

A material rated as chemically resistant may still provide unacceptable pump performance when exposed to mechanical cycling, elevated temperature, pressure, or a multicomponent chemical formulation. A standard compatibility chart from a material supplier simply cannot account for real-world pump operation¹.

A simple immersion test doesn't evaluate:

• The flexing and stretching of a diaphragm.
• The repeated impact and deformation of valve seats.
• Stress concentrations in a molded pump head.
• The unknown effects of proprietary additives in a commercial liquid.
• Long-term chemical absorption and swelling.
• Exposure to other wetted parts like seals, bonding agents, or metal components.

Ultimately, material compatibility is just the first step. Pump compatibility is what determines success or failure.

What Liquid Categories May Be Compatible?

You have a chemical application and want to know if this pump configuration is even a potential starting point. You need a general guide before diving into detailed testing.

This material combination is a strong candidate for many applications, including water-based solutions, glycol coolants, and detergents. It is also frequently evaluated for inks, lab reagents, and cleaning fluids in medical and printing equipment.

The following categories are potential candidates for engineering evaluation. They should not be interpreted as a guaranteed compatibility list.

Reagents, Buffers, and Electrolytes for Analyzers

This is a core application area, covering biochemical analyzers, medical devices, and laboratory instruments.

• Examples: Saline solutions, buffer solutions (e.g., PBS), electrolytes, diluted cleaning agents for wash cycles (like in a plate washer), and liquid samples for environmental analysis.
• Check: Need for high purity and non-leaching materials, precision dosing requirements, and compatibility with sensitive biological components.

Inks, Dyes, and Digital Printing Fluids

A massive application for robust liquid pumps, especially in industrial inkjet and digital printing.

• Examples: Water-based inks, selected solvent-based inks, and maintenance/flushing fluids.
• Check: The ink's base (water, solvent, oil), presence of pigments (which are abrasive particles), viscosity, and additives like surfactants and binders which can be aggressive. Compatibility with UV-curable inks requires special review.

Glycol-Based Coolants

This material set is frequently evaluated for propylene glycol (PG) and ethylene glycol (EG) coolants used in electronics and industrial equipment. Here, we must know the glycol concentration, the type of corrosion inhibitors used, and the viscosity at operating temperatures.

Detergents and Surfactant Solutions

Many liquid detergents and industrial cleaners can be handled. Key factors to verify are the chemical concentration, viscosity, any fragrance oils or solvents, and whether the liquid can leave deposits after drying.

What Liquids Require Detailed Compatibility Review?

Your application involves something more aggressive, like a disinfectant or plating solution. You know this is a higher-risk application and need to understand the specific concerns.

Chemicals like bleach, complex disinfectants, and plating solutions require a much more detailed review. Their compatibility depends heavily on concentration, temperature, and the specific grade of the pump's wetted materials.

This is where a simple material list is not enough.

Sodium Hypochlorite (Bleach) and Oxidizers

Sodium hypochlorite is a strong oxidizer². Its compatibility is highly dependent on the active chlorine concentration, pH, temperature, and even its age. Gas can form as the chemical decomposes, which can affect priming and flow. The exact FFKM valve compound is critical here.

Disinfectant Formulations

"Disinfectant" is a broad marketing term, not a single chemical category³. Formulations can contain bleach, hydrogen peroxide, alcohols, quaternary ammonium compounds, and various surfactants. Compatibility with one disinfectant formula absolutely does not confirm compatibility with another.

Electroplating and Electropolishing Solutions

These baths often contain strong mixed acids, metal salts, and proprietary brighteners at elevated temperatures. The combination of heat, aggressive chemistry, and pressure makes this a very demanding application. Actual-liquid testing is strongly recommended.

Ketones and Other Industrial Solvents

While PTFE and FFKM have good resistance to many solvents, we must evaluate the entire system. Swelling of seals, extraction of plasticizers from tubing, and safety concerns like flammability and vapor pressure are all critical considerations.

What Liquids Are Difficult for a Micro Diaphragm Pump?

Your chemical is compatible with the pump materials, but the pump still doesn't work well. It's struggling to prime or the flow rate has dropped to zero.

Even with perfect chemical compatibility, a micro diaphragm pump may struggle with certain liquid properties. Abrasive particles (like in pigment inks), crystallizing solutions, and high-viscosity fluids can cause mechanical, not chemical, failure.

Abrasive Liquids (e.g., Pigment Inks)

Liquids containing hard particles can physically wear down the sealing surfaces of the valves and the diaphragm itself, leading to internal leakage and loss of performance. A filter can help, but it adds pressure drop to the system.

Crystallizing Liquids

Solutions that are near their saturation point can be problematic. If the liquid dries inside the pump during shutdown, crystals can form. These crystals can block the tiny valve ports, preventing the pump from priming or pumping on the next startup.

Curing or Polymerizing Liquids

Pumping reactive chemicals like adhesives, resins, or two-part epoxies is extremely difficult. If the liquid begins to cure inside the pump head, it will seize the pump permanently.

High-Viscosity Liquids

Thick, viscous liquids are hard to pull into the pump chamber (suction) and push out. This reduces flow rate, lowers efficiency, and can prevent the valves from seating correctly.

How Can You Screen Different Liquids for Compatibility?

You've learned about all the different categories and challenges. You need a quick reference to summarize the evaluation status and what information is most important for each type of liquid.

This screening table provides a quick reference for various liquids. "Potential candidates" are good starting points, while "detailed review" items require more data. "Challenging" liquids may have mechanical issues beyond just chemical compatibility.

This table summarizes our preliminary guidance.

Liquid Category	Preliminary Status	Key Information Required
Reagents & Buffers	Potential candidate	Formulation, purity needs, temperature
Inks & Dyes	Case-by-case review	Solvent base, pigments, additives, viscosity
Water-based solutions	Potential candidate	Additives, purity, and temperature
Glycol coolants	Potential candidate	Concentration, inhibitors, and viscosity
Detergents	Potential candidate	Formulation, viscosity, and deposits
Sodium hypochlorite	Detailed review required	Active chlorine, pH, and temperature
Disinfectants	Exact formulation required	SDS and complete ingredient information
Plating solutions	Detailed review required	Complete bath formulation and temperature
Industrial solvents	Detailed review required	Solvent blend, temperature, and safety
Abrasive suspensions	Generally challenging	Particle size and concentration
Crystallizing liquids	Generally challenging	Deposit formation and cleaning method

Disclaimer: This table provides preliminary application guidance only. It does not constitute a chemical-compatibility guarantee or final pump approval.

What Are the Key Factors That Determine Actual Diaphragm Liquid Pump Compatibility?

Your chemical passed the initial screening, but you know there's more to it. Focusing on these seven factors will move you from a guess to an engineering-based decision.

Beyond the material name, actual compatibility is determined by seven key factors: the exact chemical formulation, concentration, temperature, exposure duration, working pressure, viscosity, and the complete wetted fluid path. Overlooking any one of these can lead to unexpected pump failure.

Here are the seven factors you must always consider:

1. The Exact Chemical Formulation

The commercial product name alone is insufficient. Different brands of the same "type" of chemical can contain different additives. Always request a Safety Data Sheet (SDS) or Technical Data Sheet (TDS).

2. Concentration

A pump material might be perfectly fine with a 10% solution but fail rapidly in a 50% solution of the same chemical. Compatibility can change dramatically with concentration.

3. Liquid Temperature

Chemical reactions, including attacks on materials, accelerate at higher temperatures. You must know both the normal and the maximum liquid temperatures the pump will experience.

4. Exposure Duration

How long will the chemical be in contact with the pump? There's a big difference between short dosing cycles, intermittent circulation, continuous 24/7 operation, and static immersion during long shutdown periods.

5. Working Pressure

Chemical exposure combined with the mechanical stress from pressure can cause failures like stress cracking, which would not occur in a simple static immersion test.

6. Viscosity and Particles

These physical properties influence flow rate, suction capability, valve operation, and wear life, even if the chemical itself is inert.

7. The Complete Wetted Fluid Path

You must verify every single component that the liquid touches:

• Pump head
• Diaphragm (including any backing material)
• Valves and valve seats
• Internal seals or O-rings
• Tubing and fittings
• Any filters in the system
• Any exposed metal components like screws or shafts

How Should Compatibility Be Verified?

You understand the risks and are ready to do a proper evaluation. You need a systematic process to confirm that a pump will survive in your application.

A robust verification process moves from data review to static material tests, and finally to dynamic pump testing with the actual liquid under real-world conditions. This is the only way to ensure long-term reliability.

As an micro diaphragm liquid specialist, I recommend this four-step process:

1. Review the SDS and Operating Conditions: Always start by obtaining the Safety Data Sheet (SDS) for your liquid. This document lists the chemical ingredients, concentrations, and pH. Combine this with your known operating temperature, pressure, and duty cycle.
2. Conduct a Static Immersion Test: Submerge samples of the pump's wetted materials (PPS, PTFE, FFKM, tubing) in the liquid at the operating temperature. After a set period (e.g., 72 hours), inspect them for swelling, weight change, hardening, or any other degradation.
3. Conduct a Dynamic Pump Test: This is the most critical step. Run the complete pump with the actual liquid under your target pressure and flow conditions. This will reveal issues that static tests miss, like valve sealing problems or flow degradation.
4. Complete an Application-Specific Life Test: For a production OEM project, you must validate the pump's long-term performance. This involves running one or more pumps for hundreds or thousands of hours under representative conditions to confirm the service life meets your requirements.

What Information Is Required Before Selecting a Micro Liquid Pump?

You're ready to contact us for a recommendation. To get a fast and accurate answer, you need to provide more than just the name of your liquid.

To select the right chemical pump, you must provide a complete picture of your application. This includes the liquid's full formulation, concentration, temperature, viscosity, and your system's required flow and pressure.

Before you send an inquiry, gather this information:

• Liquid Details: Liquid name, Safety Data Sheet (SDS), chemical concentration, and pH.
• Operating Conditions: Normal and maximum liquid temperature, viscosity, and any particle content.
• Performance Needs: Required flow rate at your normal working pressure, maximum system pressure, and any suction requirements.
• System Design: Operating cycle (continuous/intermittent), tubing materials, required service life, and what happens when the pump is shut down (liquid retention).

The more details you provide, the better we can assess the application and recommend a suitable pump configuration.

Which BODENFLO Pumps Use a PPS+FFKM+PTFE Configuration?

You've learned the theory, and now you want to see our practical solutions. Where can you find this robust material combination in our product line?

At BODENFLO, we specialize in high-performance pumps. Our entire BD-05T series is built with the PPS pump head, PTFE diaphragm, and FFKM valve configuration to meet demanding chemical applications.

This powerful materials combination is the standard for our BD-05T series of micro diaphragm liquid pumps. We designed this series specifically for applications where chemical resistance and long life are critical, such as in medical analyzers, digital inkjet printers, and environmental monitoring equipment. The series covers a wide range of performance needs, from low-flow precision dosing to high-flow circulation, ensuring that you can find a model with the right specifications for your project. Each model shares the same core commitment to chemical compatibility, giving you a reliable platform to build your system upon.

Model	Max Free Flow	Max Pressure	Key Features & Common Applications
BD-05TF110WB	110 mL/min	2.5 bar	High pressure, compact size. Ideal for precision reagent dosing, high-pressure cleaning cycles.
BD-05TF300WB	300 mL/min	1.0 bar	Brushless motor, good balance. Used in waste ink removal, sample transfer, lab automation.
BD-05TF450WB	450 mL/min	1.2 bar	High precision flow. Suited for chemical analysis instruments, buffer supply, wash stations.
BD-05TF480WB	480 mL/min	1.5 bar	Robust performance. Often used in CIJ (Continuous Inkjet) printers, solvent handling.
BD-05TF600WB	600 mL/min	1.0 bar	Optimized for circulation. Excellent for ink circulation systems, coolant loops, water analysis.
BD-05TF800WBD	800 mL/min	1.5 bar	High flow, durable motor. Used in medical equipment cleaning, water treatment sampling.
BD-05TF1500WB	1.5 L/min	1.0 bar	Highest flow in series. Great for bulk reagent transfer, system flushing, rapid liquid fill.

Conclusion

PPS, PTFE, and FFKM offer a strong starting point for chemical-resistant pumps used in industrial printing, medical diagnostics, and laboratory equipment. However, material names alone do not guarantee success. Compatibility must be verified against the entire fluid path and your specific operating conditions. Actual-liquid testing under dynamic conditions is the only reliable way to confirm a pump's suitability for a demanding chemical application.

To evaluate a chemical-resistant micro liquid pump for your application, provide the liquid SDS, concentration, temperature, required flow, and working pressure. BODENFLO can review the complete wetted-fluid path and recommend a suitable pump configuration.

Contact BODENFLO to Review Your Chemical Application

FAQ About Chemical-Resistant Micro Pumps

Can this pump handle inks?
It may be suitable for many water-based and some solvent-based inks. However, the ink formulation, especially the presence of abrasive pigments and aggressive additives, must be carefully reviewed. Testing with the specific ink is highly recommended.

Is it suitable for medical reagents or analyzers?
Yes, this is a primary application. The high-purity wetted path is often ideal for dosing reagents, buffers, and cleaning solutions. Compatibility with each specific fluid and the need for precision must be verified.

Can a PPS–PTFE–FFKM pump handle acids?
It may be compatible with selected diluted acids. The specific acid, concentration, temperature, and complete pump construction must be evaluated case-by-case. Strong, hot, or mixed acids require extensive testing.

Can it pump sodium hypochlorite or bleach?
Selected bleach solutions may be evaluated, but compatibility is not guaranteed. The active chlorine concentration, pH, temperature, and specific FFKM compound must all be confirmed through testing.

Does a PTFE diaphragm mean the entire liquid path is PTFE?
No. This is a critical point. The diaphragm is only one component. The pump head, valves, and any seals are typically made from different materials (like PPS and FFKM) that also must be compatible.

---