Viton Seals Are Tough, but Is Your Cleaning Chemical Too Tough?
The motor runs. The spray feels weaker. There is no puddle under the machine. Could the cleaning chemical be part of the problem?
Viton™ is a durable, chemically resistant elastomer used in cleaning-equipment pumps. But chemical resistance has limits. Choosing a product for its cleaning power without checking equipment compatibility can lead to downtime and repairs.
Exterior comparison: new pump on the left; used pump with chemical residue on the right, as identified during Stainout’s inspection. Exterior residue alone does not establish internal seal damage or identify the source of a leak.
Why we use Viton—and why the whole pump matters
The following Aquatec replacement pumps use Viton components in Stainout equipment. Select a linked part number below to view the pump details and current availability.
C-006 — Aquatec 12V DC, 120 PSI Demand Pump — Replacement pump with pressure switch and Viton components for G3 and Penguin battery sprayers.
C-002 — Aquatec 115V AC, 120 PSI Demand Pump — Replacement pump with pressure switch and Viton components for Hyper 5 and Hyper 10 extractors equipped with the 115V 120-PSI pump, and the Penguin electric sprayer.
C-007 — Aquatec 115V AC, 220 PSI Demand Pump — Replacement pump with pressure switch, internal bypass, and Viton components for the Hyper 10 Super Vac. Aquatec model: 58-FLC-220.
Before ordering, match the part number, voltage, and pressure rating to your machine’s existing pump. Hyper 10 configurations use different pumps; the 120-PSI and 220-PSI models are not interchangeable selections.
For example, Aquatec’s 58-FLC-220 specification lists Viton valves, a Santoprene diaphragm, and nylon housings. A favorable rating for Viton does not establish compatibility with every part the solution touches. Hoses, fittings, tools, and other seals also matter. [1]
Viton is a brand of fluoroelastomer, commonly called FKM. Different grades have different resistance. Concentration, temperature, and exposure time affect the result, so a generic chart is a screening tool rather than a guarantee. [2, 6]
Chemical compatibility: a practical starting point
The chart below concerns Viton/FKM only. Application examples describe where ingredients may be encountered; they do not mean every product in that category contains them. Favorable ratings are not permission to put a chemical into a Stainout machine. Follow the equipment manual and confirm the complete formula at its working dilution and temperature.
Ingredient / possible application | Viton/FKM guidance |
Citric acid / acid rinses and descalers | Favorable general rating. Check the finished product. [3] |
Detergents / extraction and general cleaning | Favorable broad rating; added ingredients require review. [3] |
Ethanol or isopropyl alcohol / glass and surface cleaning | Favorable material ratings; no approval for pumping flammable liquids. [3] |
Orange or lemon oil / citrus cleaners | Favorable chart ratings; the complete blend still needs verification. [3] |
Acetone or MEK / specialty solvent removal | Poor compatibility with conventional Viton. [2, 3] |
Ester solvents such as ethyl acetate / adhesive removal | Generally unsuitable for conventional Viton. [2] |
Ammonia or ammonium hydroxide / some glass cleaners | Concern: ordinary FKM is rated unsuitable for ammonium hydroxide. [4] |
2-butoxyethanol (butyl cellosolve) / some degreasers | Ordinary FKM is rated unsuitable. [4] |
Strong sodium or potassium hydroxide / caustic cleaning | Concentration and grade matter; concentrates can severely damage conventional Viton. [2, 3] |
Bleach or hydrogen peroxide / disinfection and spotting | Verify first. Chart results vary with chemical conditions; a seal rating does not approve the pump. [3, 4] |
Are degreasers and citrus cleaners bad for Viton?
The product name alone cannot answer that question. “Degreaser” describes a cleaning task, not a single chemical. Check for ingredients such as strong caustics, ammonia, or incompatible solvents instead of rejecting or approving the entire category.
Citrus cleaners also vary. Published charts rate citrus oils favorably for Viton, but that does not make every d-limonene cleaner suitable for an Aquatec pump. Other ingredients or pump materials may be the limiting factor. Citrus fragrance, citrus oil, and citric acid are different things; confirm the actual formulation rather than relying on the word “citrus.” [3, 4]
How internal leakage can reduce pressure
A diaphragm pump relies on check valves that open and close to direct liquid through the pump. If a valve becomes distorted or damaged and cannot seat properly, some liquid can slip backward during a pumping stroke. Less useful flow reaches the tool, and the pump may struggle to produce its previous operating pressure. This is a possible failure mechanism, not a diagnosis of chemical attack. [5]
Internal leakage can happen without an external drip. A running motor tells you the motor is operating; it does not prove the pump is moving solution correctly.
Symptoms worth investigating
What you notice | Possible explanation or next check |
Weaker spray or reduced pressure | Valve leakage is possible. Also check solution supply, inlet filter, hose restrictions, nozzle condition, and power supply. |
Pump runs but primes poorly or delivers little solution | Check tank level, pickup tube, suction connections, and trapped air before suspecting damaged valves. |
Pressure drops or pump restarts with the trigger released | Check for tool, hose, and connection leaks; internal valve leakage is another possibility on demand systems. |
Visible leakage at the pump | Connections, seals, diaphragm, or housing may be involved; visible leakage alone does not identify the failed material. |
Change begins after a new chemical or stronger mix | Record the product, dilution, temperature, and exposure time. The timing is a clue, not proof. |
These are troubleshooting clues. Debris, normal wear, restrictions, suction leaks, and electrical problems can resemble seal damage. Replacing a pump without finding the cause may leave the original problem unresolved. [5]
What damaged rubber may look like
Inside comparison: new assembly on the left; used assembly showing discoloration and swelling at the perimeter on the right. Pump assemblies contain several materials, so identify the affected component before selecting a replacement or checking chemical compatibility.
In our inspection, the new black rubber component was firm and resilient, holding its intended shape. The removed used component was extremely soft and broke down during handling, leaving black residue on our fingers. It also allowed water to leak past instead of maintaining a proper seal.
This example shows why a motor can still run while the pump loses useful pressure. A valve that no longer seals can let solution slip backward internally. The photos and inspection document deterioration, but do not identify which chemical caused it.
Inspection may reveal swollen or distorted parts, unusually soft or gummy rubber, shrinkage, hardening, or cracks. Compare the part with an unused replacement when possible. These changes can be consistent with chemical incompatibility, but appearance alone does not establish the cause or determine warranty coverage. [7]
What to check before replacing the pump
Stop using a suspect chemical. If there is visible leakage, switch off the equipment and disconnect power before inspection.
Check basic supply issues: tank level, pickup tube, clean inlet filter, kinked hoses, and secure suction connections. Follow the machine’s maintenance instructions.
Check the nozzle and tool. Compare performance under the same conditions; a different nozzle can change operating pressure.
Identify the chemical precisely. Keep its label and Safety Data Sheet (SDS), working dilution, solution temperature, and how long it remained in the system.
Ask the chemical supplier and equipment manufacturer about the complete formulation and all wetted materials. An SDS is a starting point and may not disclose the full formula.
Have internal inspection or repair performed according to the service instructions. Do not increase a pressure-switch or bypass setting to compensate for unexplained pressure loss.
Protect the pump between jobs
Use the specified dilution, observe the equipment’s temperature limits, and follow its flushing and storage instructions. Where the chemical and equipment instructions permit, flush with clean water after use rather than leaving cleaning solution in the system. Flushing does not make an incompatible chemical safe or reverse established damage. Never mix chemicals while flushing or troubleshooting.
If performance changes, contact Stainout or your distributor with the machine model, date code, pump information, symptoms, and chemical details. That information makes troubleshooting more useful than guessing from pressure alone.
Common pump and chemical questions
Does Viton mean I can use any cleaning chemical?
No. Check the complete cleaning formulation at its intended dilution and temperature against all materials the solution touches. A favorable Viton rating alone does not approve a chemical for the whole pump.
Does low pressure mean my seals have chemical damage?
Not necessarily. First check the solution supply, inlet filter, suction connections, hoses, nozzle, and power supply according to the machine instructions. Damaged valves are one possible cause. Low pressure alone does not establish chemical damage or determine warranty coverage.
Which replacement pump fits my machine?
C-006 is the 12V DC, 120-PSI pump for G3 and Penguin battery sprayers. C-002 is the 115V AC, 120-PSI pump for Hyper 5 and Hyper 10 models equipped with that pump, and the Penguin electric sprayer. C-007 is the 115V AC, 220-PSI pump for the Hyper 10 Super Vac. Use the linked pump listings above and match your existing part number, voltage, and pressure rating before ordering.
What information should I send for troubleshooting?
Email info@stainoutsystem.com with your machine model, date code, pump part number or label photo, symptoms, and any relevant photos or video. Include the cleaning product name, dilution, solution temperature, and exposure time. We can help review the information or direct you to the appropriate distributor; inspection may be needed to determine the cause.
Technical references
General educational guidance only. This article does not approve a particular cleaning product for a particular machine. Confirm pump-specific materials and chemical suitability before use.
As a professional carpet cleaner, I believe anything that damages viton seals is a product I do not want to use, breath or leave behind on a carpet to expose to customer, children or pets. So, read the labels and find safer alternatives to harsh chemicals. Saves the sprayer and your health and reputation