Rapeseed Natural Ester
Rapeseed Natural Ester dielectric Fluid for Transformers
SHRI PARTH PETROCHEM proudly offers FR–3 Oil, a premium Rapeseed natural ester-based dielectric fluid designed to enhance transformer performance, safety, and sustainability. Developed from renewable vegetable oils, FR–3 Oil is the industry benchmark for environmentally friendly and high-performance insulating fluids.
Rapeseed natural ester, derived from rapeseed oil, is a renewable, biodegradable, and non-toxic alternative to mineral oil, known for its high flash point and fire resistance, and is used as a dielectric fluid in transformers.

Specific Properties (Examples):
- Derived from >95% rapeseed oil.
- 00% biodegradable in as little as 10 days.
- Non-toxic in soil and water
- Manufactured using renewable vegetable oil (rapeseed).
- Offers superior moisture tolerance.
- Has the potential to increase the lifetime of cellulose-based solid insulation
Density
- Typically around 920 kg/m3.
Kinematic Viscosity: Varies depending on the temperature, but generally higher than mineral oil.
- At 40°C: 40 -45 CST @ 40 c
- At -20°C: 500 mm2/sec.
- Pour Point : Around -21°C. .
About FR-3 Rapeseed Natural Ester Oil
FR3 Oil is a Rapeseed natural ester fluid specifically engineered for transformers and other electrical applications. It provides superior dielectric strength, exceptional thermal stability, and extended equipment life. Recognized globally for its eco-friendly attributes, FR3 Oil is UL-classified as a biodegradable and non-toxic alternative to mineral oils.
Key Characteristics and Benefits
- Renewable and Biodegradable: Rapeseed oil is a renewable resource, and the resulting natural ester is readily biodegradable, making it an environmentally friendly option.
- Non-Toxic : It is non-toxic to soil and water, ensuring minimal environmental impact
- High Flash and Fire Points : Rapeseed natural ester has a significantly higher flash point (over 300°C) and fire point (over 330°C) compared to mineral oil, making it less flammable and safer for applications like transformers.
- Good Dielectric Properties : It offers good dielectric strength and insulation properties, suitable for use in transformers and other electrical equipment.
- Moisture Tolerance : Rapeseed natural ester exhibits superior moisture tolerance compared to mineral oil, which can help extend the lifespan of cellulose-based solid insulation in transformers.
- Reduced Environmental Impact : Compared to mineral oil, rapeseed natural ester has a lower carbon footprint and does not contain petroleum, halogens, silicones, or sulfurs, further enhancing its environmental profile
Key Features
- Superior Fire Safety : High flash point (> 300°C) reduces fire hazards significantly.
- Eco-Friendly : 100% biodegradable, non-toxic, and derived from renewable plant-based oils.
- Enhanced Transformer Performance : Increases insulation paper life by up to 8 times, prolonging equipment lifespan.
- Thermal Efficiency : Supports higher operating temperatures, allowing for greater load capacity.
- Moisture Tolerance : Absorbs and retains moisture without compromising dielectric properties.
SHRIPARTH FR3 fluid has exceptionally high flash/fire points of approximately 330/360 °C – the highest ignition resistance of any high fire point dielectric fluid currently available. It qualifies as a “high-fire-point”, “less-flammable”, “IEC Class K”.
SHRIPARTH FR3 fluid is compatible with standard transformer construction materials and components. SHRIPARTH FR3 fluid should be stored, handled, and processed in a similar meticulous manner as transformer mineral oil,

FIRE SAFETY
SHRIPARTH FR3 fluid has a fire point of approximately 360°C, well above the minimum of 300°C required for high fire point fluid classifications. Its flash point (approximately 330°C) is higher than the fire point of most other ignition resistant dielectric fluids in use today.
In laboratory and full-scale ignition tests, SHRIPARTH FR3 fluid has demonstrated greater fire resistance than other dielectric fluid types. Based on large-scale arc ignition testing, The probability of a pool fire evolving from SHRIPARTH FR3 fluid was so low that heat release rate need not be determined.
Based on large-scale arc ignition and hot metal ignition tests, SHRIPARTH FR3 fluid as an equivalent safeguard to space separation, fire barriers, and fire suppression systems for most installations.
Applications :
Transformer Dielectric Fluid
Rapeseed natural ester is used as a dielectric fluid in transformers, offering a safer and more environmentally friendly alternative to mineral oil.
Other Electrical Equipment
It can also be used in other types of electrical equipment where a high flash point and fire resistance are needed.
Benefits of Using Rapeseed FR--3 Oil
Environmental Responsibility: Reduces carbon footprint and aligns with global sustainability goals.
Cost Savings: Longer transformer life and reduced maintenance lower total ownership costs.
Regulatory Compliance: Meets or exceeds IEC, IEEE, and ASTM standards.
Cost Savings: Longer transformer life and reduced maintenance lower total ownership costs.
Regulatory Compliance: Meets or exceeds IEC, IEEE, and ASTM standards.
SHRIPARTH FR3 Specifications :
Appearance : | Clear to light-green liquid |
Flash Point: | > 300°C |
Dielectric Strength : | > 56 kV |
Biodegradability : | > 98% (OECD 301B) |
Appearance: | clear, |
Odor : | slight vegetable oil odor |
Closed cup flash point : | 310 – 320°C |
Autoignition temperature: | 401 − 404°C |
Boiling point : | >360°C |
Relative density (H2O = 1): | 0.92 |
Vapor pressure (mm Hg): | < 0.01 @ 20° |
Vapor density (air = 1): | n/a |
Solubility in water: negligible; | < 0.1% |
Viscosity : | 40 to 45 CST at 40°C |
Viscosity : | 10 to 12 CST at 100°C |