Fuel System Icing Inhibitor FSII is an additive to aviation fuels that prevents the formation of ice in fuel lines.
Category
A Fuel System Icing Inhibitor (FSII) is a manufactured fluid which, when added to aviation fuels, helps to prevent the formation of ice crystals in filters, fuel lines and other fuel system components.
Fuel System Icing Inhibitor (FSII) is a specially formulated additive designed to prevent the formation of ice in aircraft and diesel fuel systems caused by water contamination. It ensures safe operation in extreme cold conditions by reducing the freezing point of water and dispersing small water droplets in fuel.
Application
Simply adding Fuel System Icing Inhibitor FSII after the fuel has been pumped is therefore not sufficient. As aircraft climbs after takeoff, the temperature drops, and any dissolved water will separate out from the fuel. Fuel System Icing Inhibitor FSII dissolves itself in water preferentially over the jet fuel, where it then serves to depress the freezing point of water to -43 °C. Since the freezing point of jet fuel itself is usually in this region, the formation of ice is now a minimal concern. Large aircraft do not require FSII as they are usually equipped with electric fuel line heaters or fuel/ oil intercoolers that keep the fuel at an appropriate temperature to prevent icing. However, if the fuel heaters are inoperable, the aircraft may be still be declared fit to fly, if Fuel System Icing Inhibitor FSII is added to the fuel.
Aviation Fuels
- FSII is primarily used in turbine engine fuels to prevent icing in fuel lines and filters at high altitudes and sub-zero temperatures.
- Recommended concentration: 0.10–0.15% v/v.
- Add FSII directly into the fuel tank or during fuel transfer to ensure proper blending.
- Particularly important for aircraft operating in cold and humid climates where water condensation in fuel is common.
Diesel & Gasoline Engines
- Used in critical diesel generator sets, marine engines, and military vehicles operating in cold regions.
- Prevents ice crystals in fuel filters and lines during cold starts.
- Helps in maintaining reliable fuel flow and combustion efficiency.
Fuel Storage & Distribution Systems
- FSII protects against icing during fuel transfer, storage, and pumping operations.
- Can be dosed in bulk fuel storage tanks, ensuring protection across distribution chains.
- FSII also exhibits biocidal activity, minimizing microbial growth at the fuel-water interface, thus reducing fuel contamination and filter plugging.
Marine & Offshore Applications
- Ensures reliable fuel delivery in offshore drilling rigs, ships, and naval vessels operating in cold waters.
- Prevents operational downtime due to frozen fuel lines.
Dose
Fuel System Icing Inhibitor FSII is an agent that is mixed with jet fuel as it is pumped into the aircraft. The mixture of FSII must be between 0.10% and 0.15% by volume for the additive to work correctly, and the FSII must be distributed evenly throughout the fuel.
NOTE: Dosage varies on various conditions and is subject to change
Important Notes:
- FSII must be blended uniformly; partial dosing or poor mixing can lead to localized icing.
- It is not a substitute for proper fuel maintenance; water should still be drained regularly from tanks.
- FSII is consumable – once mixed, it may evaporate or degrade slightly over time, so fuel should not be stored too long without rotation.
Technical specifications
Note
It is extremely important to store Fuel System Icing Inhibitor FSII properly. Drums containing FSII must be kept clean and dry, since the additive is hygroscopic and can absorb water directly from moisture in the air. Since FSII is toxic, a crew member must wear gloves when handling it undiluted. Many FBOs allow Fuel System Icing Inhibitor FSII injection to be turned on or off so that one fuel truck can service planes that do require Fuel System Icing Inhibitor FSII as well as planes that don't. Line crew, however, must be able to deliver FSII when it is needed.
Key Features of Fuel System Icing Inhibitor
- Prevents fuel line and filter icing in aviation & diesel systems.
- Effective in aviation turbine fuels at low concentrations (0.10–0.15% v/v).
- Enhances safety during cold weather and high-altitude operations.
- Compatible with jet fuels and diesel without affecting performance.
- Provides additional biocidal protection against microbial growth in fuel-water interfaces.
Packing sizes
Fuel System Icing Inhibitor FSII is available in 25, 50, 210, and 1000 Ltr TANK.
MSDS
| Product Name | RXSOL-70-7021-200 |
| Product Type | Fuel System Icing Inhibitor FSII |
Company Details:
RX MARINE INTERNATIONAL
105, A wing , BSEL , TECH PARK.
VASHI ,NEW BOMBAY 400703 INDIA
Stock Point : Mumbai, Kandla, Chennai, Visakhapatnam, Kolkata, Fujairah, Muscat Barka, Kenya Africa, Canada.
| Phone | +91 22 27815541 / 42 |
| Fax | +91 22 2781 1318 :::AOH :0091 9821214367 |
| mail@rxmarine.com |
2.1. Substances: DIETHYLENE GLYCOL MONOETHYL ETHER
Substance: PROPRIETORY BLEND
3.1. Classification of the substance or mixture
Classification according to Regulation (EC) No. 1272/2008 [CLP]
Serious eye damage/eye irritation, H319
Category 2
Classification according to Directive 67/548/EEC [DSD] or 1999/45/EC [DPD]
Adverse physicochemical, human health and environmental effects
No additional information available
3.2. Label elements
Labelling according to Regulation (EC) No. 1272/2008 [CLP] Extra labelling to
displayExtra classification(s) to display
Symbol(s) : Xi : Irritation.
Xn: Harmful
R Phrase(s) : R36: Irritating to eyes.
S Phrase(s) : S36: Wear suitable protective clothing.
S26: In the case of contact with eyes, rinse immediately with plenty of water and seek
medical advise.
Hazard pictograms :
Signal word : Warning
Hazard statements : H319 - Causes serious eye irritation.
Precautionary statements: P305+P351+P338 - IF IN EYES: Rinse cautiously with
water for several minutes.
Remove contact lenses, if present and easy to do. Continue rinsing.
3.3. Other hazards
No additional information available
4.1. Description of first aid measures
First-aid measures after inhalation : Assure fresh air breathing.If breathing is difficult,
remove victim to fresh air and keep at rest in a position comfortable for breathing.
First-aid measures after skin contact : Wash with plenty of water/…. Get immediate
medical advice/attention.
First-aid measures after eye contact : Rinse cautiously with water for several minutes.
Remove contact lenses, if present and easy to do. Continue rinsing. Get medical
advice/attention.
First-aid measures after ingestion : Rinse mouth. Do not induce vomiting. Get medical
advice/attention.
4.2. Most important symptoms and effects, both acute and delayed
Symptoms/effects after eye contact : Causes serious eye irritation.
4.3. Indication of any immediate medical attention and special treatment needed
Treat symptomatically.
5.1. Extinguishing media
Suitable extinguishing media : Carbon dioxide. Dry powder. Foam. Water spray.
Unsuitable extinguishing media : Do not use a heavy water stream.
5.2. Special hazards arising from the substance or mixture
No additional information available
5.3. Advice for firefighters
Protection during firefighting : Do not enter fire area without proper protective
equipment, including respiratory protection.
6.1. Personal precautions, protective equipment and emergency procedures
6.1.1. For non-emergency personnel
Emergency procedures : Evacuate unnecessary personnel.
6.1.2. For emergency responders
Protective equipment : Use personal protective equipment as required.
Emergency procedures : Ventilate area.
6.2. Environmental precautions
Avoid release to the environment.
6.3. Methods and material for containment and cleaning up
Methods for cleaning up : On land, sweep or shovel into suitable containers.
Collect spillage.
6.4. Reference to other sections
No additional information available
7.1. Precautions for safe handling
Precautions for safe handling : Avoid contact with skin and eyes. Do not breathe vapours.
Provide good ventilation in process area to prevent formation of vapour.
Hygiene measures : Wash hands and other exposed areas with mild soap and water before
eating, drinking or smoking and when leaving work.
7.2. Conditions for safe storage, including any incompatibilities
Storage conditions : Store in a well-ventilated place. Keep container tightly closed.
7.3. Specific end use(s)
No additional information available
8.1. Control parameters
No additional information available
8.2. Exposure controls
Hand protection : Protective gloves
Eye protection : Chemical goggles or safety glasses
Skin and body protection : Wear suitable protective clothing
Respiratory protection : [In case of inadequate ventilation] wear respiratory protection.
9.1. Information on basic physical and chemical properties
| Property | Value |
| Odour threshold | No data available |
| pH | 7 |
| Relative evaporation rate (butyl acetate = 1) | 0.01 |
| Melting point | -68 °C |
| Freezing point | No data available |
| Boiling point | 231 °C |
| Flash point | 99 °C |
| Auto-ignition temperature | 204 °C |
| Decomposition temperature | No data available |
| Flammability (solid, gas) | No data available |
| Vapour pressure | 40 mm Hg at 130 °C |
| Relative vapour density at 20 °C | 5.6 |
| Relative density | No data available |
| Density | 0.967 g/cm³ at 25 °C |
| Solubility | Water: completely miscible |
| Log Pow | 0.56 |
| Viscosity, kinematic | No data available |
| Viscosity, dynamic | No data available |
| Explosive properties | No data available |
| Oxidising properties | No data available |
| Explosive limits | 0.009 – 0.062 vol % |
9.2. Other information
No additional information available
10.1. Reactivity
No additional information available
10.2. Chemical stability
Stable under normal conditions.
10.3. Possibility of hazardous reactions
No additional information available
10.4. Conditions to avoid
Direct sunlight.
10.5. Incompatible materials
No additional information available
10.6. Hazardous decomposition products
No additional information available
11.1. Information on toxicological effects
Acute toxicity : Not classified
Skin corrosion/irritation : Not classified
pH: 7
Serious eye damage/irritation : Causes serious eye irritation.
pH: 7
Respiratory or skin sensitisation : Not classified
Germ cell mutagenicity : Not classified
Carcinogenicity : Not classified
Reproductive toxicity : Not classified
STOT-single exposure : Not classified
STOT-repeated exposure : Not classified
Aspiration hazard : Not classified
12.1. Toxicity
No additional information available
12.2. Persistence and degradability
No additional information available
12.3. Bioaccumulative potential
Log Pow 0.56
12.4. Mobility in soil
No additional information available
12.5. Results of PBT and vPvB assessment
No additional information available
12.6. Other adverse effects
No additional information available
13.1. Waste treatment methods
No additional information available
In accordance with ADR / RID / IMDG / IATA / ADN
14.1. UN number
UN-No. (ADR) : Not applicable
UN-No. (IMDG) : Not applicable
UN-No. (IATA) : Not applicable
UN-No. (ADN) : Not applicable
UN-No. (RID) : Not applicable
14.2. UN proper shipping name
Proper Shipping Name (ADR) : Not applicable
Proper Shipping Name (IMDG) : Not applicable
Proper Shipping Name (IATA) : Not applicable
Proper Shipping Name (ADN) : Not applicable
Proper Shipping Name (RID) : Not applicable
14.3. Transport hazard class(es)
ADR- Transport hazard class(es) (ADR) : Not applicable
IMDG- Transport hazard class(es) (IMDG) : Not applicable
IATA- Transport hazard class(es) (IATA) : Not applicable
ADN- Transport hazard class(es) (ADN) : Not applicable
RID- Transport hazard class(es) (RID) : Not applicable
14.4. Packing group
Packing group (ADR) : Not applicable
Packing group (IMDG) : Not applicable
Packing group (IATA) : Not applicable
Packing group (ADN) : Not applicable
Packing group (RID) : Not applicable
14.5. Environmental hazards
Dangerous for the environment : No
Marine pollutant : No
Other information : No supplementary information available
14.6. Special precautions for user
Overland transport- No data available
Transport by sea- No data available
Air transport- No data available
Inland waterway transport- No data available
Rail transport- No data available
14.7. Transport in bulk according to Annex II of MARPOL 73/78 and the IBC Code
Not applicable
15.1. Safety, health and environmental regulations/legislation specific for the
substance or mixture
15.1.1. EU-Regulations
No REACH Annex XVII restrictions
Annex XIV List
15.2. Chemical safety assessment
No additional information available.
Abbreviations and acronyms : PBT: persistent, bioaccumulative and toxic.
vPvB: very persistent and very bioaccumulative
Sources of key data used : REGULATION (EC) No 1272/2008 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 16 December 2008 on classification, labelling and packaging of substances and mixtures, amending and repealing Directives 67/548/EEC and 1999/45/EC, and amending Regulation (EC) No 1907/2006
Further information : None.
In accordance with REACH Regulation (CE) Nº 1907/2006 and with CLP Regulation (CE) Nº 1272/2008
DISCLAIMER OF LIABILITY The information in this SDS was obtained from sources which we believe are reliable. However, the information is provided without any warranty, express or implied, regarding its correctness. The conditions or methods of handling,storage, use or disposal of the product are beyond our
control and may be beyond our knowledge. For this and other reasons, we do not assume responsibility and expressly disclaim liability for loss, damage or expense arising out of or in any way connected with the handling, storage, use or disposal of the product. This MSDS was prepared and is to be used only for this product. If the product is used as a component in another product, this MSDS information may not be applicable.