KATHON™ FP 1.5 Fuel Biocide

KATHON™ FP 1.5 treats and prevents microbiological growth in hydrocarbon fuels. It is the world’s leading broad-spectrum preservative and disinfectant for treatment of diesel, aviation, kerosene and heating fuels. In contrast to fuelclear's M68 range, KATHON™ FP 1.5 is designed for industrial volumes of fuel.

About KATHON™ FP 1.5 Fuel Biocide

KATHON™ FP 1.5 is used by aviation, shipping, and major companies globally for preservation and safe protection against contamination by microbial growth. The effectiveness of KATHON™ FP 1.5 has been proven over a number of years and it has extensive approvals endorsing its use in a wide range of fuel types. KATHON™ FP 1.5 combines exceptional activity with broad spectrum performance. Consequently it is effective at very low use levels against all commonly occurring fuel contaminants (bacteria, fungi and yeast). Furthermore, the active ingredients of KATHON™ FP 1.5 are non-persistent in the environment, giving the product good environmental acceptability.

KATHON™ FP 1.5 is designed to cause inhibition of microbial growth upon contact, and quickly result in cell death. The exact time to kill all microbes in a fuel will vary, but will typically be between 6 and 36 hours. KATHON™ FP 1.5 is effective in systems containing both fuel and water. Unlike other fuel treatment biocides, the active ingredients in KATHON FP 1.5 are not deactivated by water.

KATHON™ FP 1.5 contains a 3:1 ratio mixture of 5-chloro-2-methyl-3(2H)isothiazolone and 2-methyl-3(2H)isothiazolone (CAS N°55965-84-9), (abbreviated name CMIT/MIT). KATHON™ FP 1.5 is a solution of the technical grade of the active ingredient, CMIT/MIT, in dipropylene glycol at a nominal value of 1.5% of active substance. This biocidal substance has been notified under the Biocidal Products Directive (BPD; notification # 408) and is registered with the United States Environmental Protection Agency (US EPA). KATHON™ FP 1.5 is supplied in 5kg flasks, 20kg drums, 215kg drums and 1000kg IBC's.

Applications & Uses

Aviation Fuels

Water and sludge should be removed from fuel tanks before application of the biocide. 100ppm v/v of KATHON™ FP 1.5 as supplied should be used to achieve microbial control, as described by EU BPD and US EPA regulations. To achieve this, the user should treat every 10,000 litres of aviation fuel with 1 litre of KATHON™ FP 1.5. The biocide should be added in such a manner so as to allow good mixing and distribution across the fuel. Ideally, this should be into a fuel supply line to ensure agitation. A contact time of up to 24 hours is recommended, depending on the severity of infection. More information on KATHON™ FP 1.5 in aviation fuel can be found here.

All Other Fuels

Water and sludge should be removed from fuel tanks before application of biocide and again after the retention period. KATHON™ FP 1.5 has been tested and found effective in a wide range of fuels, including diesel, petrol, ULSD, biodiesel, kerosene, gasoline, and other fuels used in marine, aviation, automotive and home heating applications.

KATHON™ FP 1.5 is typically dosed at 200 to 300 ppm (200ml to 300ml per 1000L fuel) for curative treatment (i.e. when there is evidence of bacterial contamination). A minimum residence time of 12 hours should be allowed, before the fuel is used, though 24 hours is recommended. The biocide should be added in such a manner so as to allow good mixing uniform distribution of the biocide across the fuel.

KATHON™ FP 1.5 can also be used as a preventative/maintenance measure (to guard against bacterial contamination) in fuels that lack microbial contamination. For such a use, the recommended dosage is 100 to 150 ppm (100-150mL per 1000L fuel). The biocide should be added in such a manner so as to allow good mixing and uniform distribution of the biocide across the fuel. In such a case the residence time should still be at least 12 hours. Extreme care must be taken to avoid the addition of a preventative/maintenance level dosage of KATHON™ FP 1.5 to a heavily contaminated fuel system.

KATHON™ FP 1.5 can also be used as a shock biocide, for fuels that are heavily contaminated. If this is the case, doses up to 1000 ppm can be administered (1L biocide per 1000L fuel) according to the BPD. The US EPA allows the use of up to 400 ppm KATHON™ FP 1.5 in heavily contaminated fuel systems (400ml biocide per 1000L fuel). In this case, the residence time is recommended to be a full 24 hours.

Features & Benefits

Broad Spectrum Activity

KATHON™ FP 1.5 is effective at very low use levels against microbial species (bacteria, fungi, yeasts) commonly encountered in fuel systems. Full details of minimum inhibitory concentration values of KATHON™ FP 1.5 against a range of micro-organisms can be found in the 'inhibition of contaminants' section below.

Rapid Inhibition of Microbial Growth

KATHON™ FP 1.5 causes immediate inhibition of growth on coming into contact with a microorganism. Growth inhibition rapidly becomes irreversible and results in cell death. The time to achieve eradication varies according to the extent of contamination and the type of microorganisms present. Typically, as the graph below indicates, within 12 hours of treatment the fuel will again be fit for use.

Long Term Preservation

Fuel treated with KATHON™ FP 1.5 will remain protected from contamination over extended periods of time. It will also resist contamination if reinoculated from another source. In studies conducted over an 8 week period, contaminated fuels were treated with fuel biocides. Once microbial control was established, the fuel was reinoculated with microbes, to measure long term protection capability. KATHON™ FP 1.5 was not dosed for a second time. The initial dose was still able to protect against bacteria and fungi.

Complete System Protection

The partitioning characteristics of KATHON™ FP 1.5 ensure that it is present in both the fuel and water phases. This facilitates eradication of contamination in the water bottom as well as protection of the fuel as it is transferred through the distribution system. The extent to which KATHON™ FP 1.5 partitions between the fuel and water phases varies according to the fuel/water ratio. Results from computer modelling indicate that after a series of 10 transfers, between 60% (fuel/water ratio of 100:1) and 97% (fuel/water ratio of 10,000:1) of the KATHON™ FP 1.5 originally dosed is retained in the fuel and is then available to subsequently repartition to the water bottom to maintain efficacy. Data generated in the field support this model. Fuel was treated at refinery storage level. It was then transferred through the usual distribution system. Analysis of the fuel was carried out at 3 points in the system. At end user level almost 88% of the original active ingredient dosed was present.

The above graph shows what happens when fuel is transferred between facilities. Even when high water content of the fuel is maintained (to simulate poor water control) , the partitioning capability of KATHON™ FP 1.5 ensures that even after 10 transfers, at least 60% of the KATHON™ FP 1.5 is still present in the fuel, and therefore able to inhibit microbial growth. This shows that fuel treated with KATHON™ FP 1.5 remains protected as it is transferred through the distribution chain.

Widely Approved: KATHON™ FP 1.5 Fuel Biocide has wide ranging approvals in aviation, marine, automotive, home heating and military fuels. Approvals have been obtained from:
  • Specialist fuel companies
  • Customs accredited laboratories
  • Global militaries
  • Industrial gas turbine manufacturers
  • Diesel engine manufacturers
  • Commercial airlines
  • Filtration equipment manufacturers
  • Airframe manufacturers
  • Aviation engine manufacturers
  • Aviation auxiliary power unit manufacturers
Note: Please consult Fuelcare to confirm approval for your specific application.

Safety and Support

Dow Microbial Control offers customers a comprehensive package of support services and data to promote the safe and effective use of KATHON™ FP 1.5. This includes extensive data on environmental fate, toxicology and materials compatibility and advice and assistance in areas such as disposal, product handling and delivery/dosing systems.

Inhibition of Contaminants

The minimum concentration of KATHON™ FP 1.5 required to inhibit commonly occurring fuel contaminants are given below.

Organism Type Organism MIC (ppm AI)
Mold(a) Hormoconis resinae(c) 3
Yeast(b) Candida albicans 1.5
Candida lipolytica(c) 1.5
Bacteria(b) Citrobacter freundii 1.5
Enterobacter aerogenes 0.375
Escherichia coli 1.5
Proteus mirabilis 1.5
Pseudomonas aeruginosa(c) 0.375
Pseudomonas oleoverans 0.375
  • a – MIC at 7 days
  • b – MIC at 48 Hours
  • c – Hydrocarbon utilising microorganism
  • MIC – Minimum Inhibitory Concentration
The data in the table above was achieved under laboratory testing, and under controlled conditions. These data are intended as an indication of the broad spectrum of activity of KATHON™ FP 1.5, and should not be interpreted as having relevance to the effectiveness or dosing against specific bacteria in formulated products or in process systems. The data cannot be used to predict performance in fuels. Fuelcare always recommends that a microbial study of the fuel is carried out before a treatment strategy is decided.

KATHON™ FP 1.5 Fuel Biocide Documentation

Documentation for the safe & effective use of KATHON™ FP 1.5 Fuel Biocide:

KATHON™ FP 1.5 Brochure » Other languages:(En Français, En Español, In Italiano)

KATHON™ FP 1.5 Product Data » Other languages:(En Français, En Español, In Italiano)

KATHON™ FP 1.5 Safety Data » Other languages:(En Français, In Italiano, En Español, In Nederlands, Po Polsku, I Svenska, In Limba Romana)

KATHON™ FP 1.5 in Jet Fuel »

KATHON™ FP 1.5 Approvals & Material Compatability »

KATHON™ FP 1.5 Dosing Chart »

KATHON™ FP 1.5 Fuel Biocide vs. Biobor JF:

KATHON™ FP 1.5 vs Biobor JF in Jet A1 fuel »

KATHON™ FP 1.5 vs Biobor JF in Diesel fuel »

Diesel Bug - Sampling, Testing & Treatment advice for Superyachts including MARPOL Annex VI advice, KATHON™ FP 1.5 Fuel Biocide & OCTAMAR™ LI-5 Plus:

Monaco Yacht Show Presentation »

KATHON™ FP 1.5 Southern Railway Case Study

Following a range of problems in their diesel fleet as a result of poor quality fuel, Southern Railway initiated the use of KATHON™ FP 1.5 in their fuel supply. Their fleet had previously suffered a range of issues resulting from this growth and their filters repeatedly blocked causing engine shut downs - often during service. The commercial costs of this were high. KATHON™ FP 1.5 quickly stopped microbial growth and prevented further growth from occurring:

Following the introduction of KATHON™ FP 1.5, Southern wanted to have the biocide continually dosed into their fuel using an automated dosing system. Our engineers designed and built an additive dosing system to fit quickly and easily into their fueling setup:

Southern have been extremely pleased with the results. Southern subsequently won the Gold & Silver spanner awards as a result of the improved reliability afforded them by KATHON™ FP 1.5:

"The automated dosing system and additive supply has been key to the recent Golden & Silver Spanner awards. The system helped Southern become the first operator to win both Gold and Silver spanners, and has helped significantly in reducing fleet reliability incidents. The system has also improved filter life and saved servicing costs."

Southern have continued to use the injection system with KATHON™ FP 1.5 for over 4 years along with ECOCLEAN™ HSDI. As biodiesel content is expected to rise in the coming years, the risk of microbial growth to train operations will increase. Call Fuelcare today to find out how we can help.