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Marship, DieselAid B, Broad Spectrum Fuel Biocide
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Marship, DieselAid B, Broad Spectrum Fuel Biocide

DieselAid B is a high-performance antimicrobial agent (microbicide), developed specially to combat the problems of microbial contamination and spoilage in hydrocarbon fuels.

DieselAid B is effective at low use levels, against microbial species commonly encountered in fuel systems, including bacteria, yeast, and mold. DieselAid B is designed to cause inhibition of microbial growth upon contact, and quickly result in cell death. DieselAid B is effective in systems containing both fuel and water. Unlike other fuel treatment biocides, the active ingredients in DieselAid B are not deactivated by water.

Microbial Growth in Fuels

As water finds its way into fuel storage tanks, often observed as fuel haziness, microorganisms breed, forming slime and emulsion that leads to filter blockage and corrosion of metal tanks. Once transported, the contaminated fuel contains the accumulated bacteria and fungi which cause the blockage of downstream filters, pumps and injectors.

Fuel Compatiblity

DieselAid B has been tested and found effective in a wide range of middle distillate hydrocarbon fuels, including diesel fuels, biodiesel blends (up to B50), gas oils, kerosene, and heating oils.


DieselAid B is used in a wide range of industries including marine, automotive, rail, agriculture, power generation and home heating applications.


DieselAid B is supplied in 1kg, 5kg, 25kg nd 200kg containers.


This product is not approved for aviation.

Dosage Rates
Dosage TypePreventative (v/v)Curative (v/v)Shock (v/v)
Contamination LevelNo evidence of microbial contaminationMedium microbial contaminationHeavy microbial contamination
Dosage Rate (ppm)50 ppm200 ppm1000 ppm
Dosage Rate (Biocide : Fuel)1:200001:50001:1000
Min. Contact Time   

Always use DieselAid B in accordance with local regulatory requirements (i.e. E.U. Biocides Products Regulations) and O.E.M. guidelines, and do not exceed recommended dose levels. 

The biocide should be added in such a manner so as to allow good mixing and uniform distribution of the biocide across the fuel. Ideally, DieselAid B should be dosed into a flowing fuel stream in the storage tank inlet. Other methods of application, such as bulk dosing, will not affect the performance DieselAid B, but might extend the treatment time required.

Where possible, water and sludge should be removed from fuel tanks before dosing DieselAid B and also after the retention period. If this is not feasible, filters should be checked more frequently for a short period, due to microbial slimes being killed off and dislodged.


Treatment with DieselAid B will kill off bacterial and fungal contamination and assist the breakdown of slimes and coagulated biological sludges. This will help to prevent filters from blinding, and allow clean fuel to flow normally.

An extra advantage is the elimination of the often deep emulsion layer at the fuel/water interface which will facilitate water removal by draining or by the fuel line separator. It is this emulsion that is often the critical problem when it enters the fuel line after fuel contents of a tank are disturbed or shaken.

Fuel treated with DieselAid B will remain protected from contamination over extended periods of time. It will also resist contamination if re-inoculated from other sources.

Broad Spectrum Activity

DieselAid B is effective at very low use levels against microbial species (bacteria, fungi, yeasts) commonly encountered in fuel systems.

Rapid Treatment

DieselAid B 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 microbes present, but will typically be between 6 and 36 hours.

Long Term Preservation

Fuel treated with DieselAid B will remain protected from contamination over extended periods of time. It will also resist contamination if reinoculated from another source.


This biocidal substance has been approved under the E.U. Biocidal Products Directive and the Tradename approved for Product Type 6 under the CMIT/MIT Biocidal Product Family. The active ingredient is registered with CASRN (66204-44-2), EC-No. (266-235-8).

Composition and Use

A broad-spectrum fuel biocide consisting 2ethylhexyl nitrate (EHNM).

Physical Properties
Appearance / OdourColourless, Clear liquid with an amine-like odour
Specific Gravity1.040-1.072 g/cm3
Viscosity (@ 25°C) 
Freezing PointNot Determined
Storage ConditionsMin. ≥ -15°C, Max. ≤ 30°C

Safety & Support

Before using this product, consult the Material Safety Data Sheet (MSDS) for details on product hazards, recommended handling precautions and product storage.

Personal Protection

Use chemical splash goggles and face shield (ANSI Z87.1 or approved equivalent). Eye protection worn must be compatible with respiratory protection system employed. Chemical-resistant gloves should be worn whenever this material is handled.


  • Irritating to skin.
  • Risk of serious damage to eyes.
  • May cause sensitization by skin contact.
  • Harmful to aquatic organisms, may cause long-term adverse effects in the aquatic environment. See MSDS for full safety data.

First Aid

Consult the Material Safety Data Sheet (MSDS) for full details.


As with most biocides, DieselAid B can be toxic to aquatic organisms. Water bottoms and effluents must therefore be diluted prior to discharge and discharged in accordance with local environmental and legal regulations. DieselAid B is biodegradable and is non-persistent in the environment. Dilution to below effective levels will facilitate its degradation - the greater the dilution factor the more rapid is the degradation. For guidance on approved discharge procedures, please contact Fuelcare or consult local authorities.


Consult the Material Safety Data Sheet (MSDS) for full details.


Consult the Material Safety Data Sheet (MSDS) for full details.

Tariff Code

Download Marship DieselAid B Biocide - Datasheet PDFDownload Marship DieselAid B Biocide - Datasheet PDF

Download Marship DieselAid B Biocide - MSDS PDFDownload Marship DieselAid B Biocide - MSDS PDF

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