MIDEL®

SAFETY INSIDEMIDEL eN 1204
Natural Ester Transformer Fluid (Rapeseed)Fire safe and Biodegradable

Customer service: +44 (0)161 864 5422 or midelsales@mimaterials.com

MIDEL eN 1204
Safety and performance from a natural source.
MIDEL protects life, property and the environment.
It saves money while enabling innovation. It’s MIDEL.
It’s safety inside.
MIDEL eN 1204 is our rapeseed oil based natural ester transformer fluid.
MIDEL is the acknowledged leading brand of ester transformer fluid. Since the1970s MIDEL has been used in hundreds of thousands of installations worldwide,providing unrivalled fire safety, environmental protection, increased asset
performance and real cost savings.
MIDEL eN 1204’s thin film rate of oxidation is half that of soya-based fluids, thus
offering greater tolerance if exposed to air.
MIDEL eN 1204 is a natural ester dielectric fluid designed to provide analternative to mineral oil, silicone liquid and dry-type transformers.
MIDEL eN 1204 has a high fire point, significantly increasing the fire safetyof your transformers and reducing the need for fire protection equipment.
MIDEL eN 1204 is sustainably sourced and readily biodegradable, avoiding
environmental damage should leakage occur and enabling reductions incontainment measures.
MIDEL eN 1204 is an effective solution for non free-breathing transformers.
MIDEL eN 1204 has a pour point around 13°C lower than the soy-based naturalester making it a better choice in cooler climates.
MIDEL eN 1204 has a high moisture tolerance. This characteristic enables theextension of cellulose insulation life.

MIDEL eN 1204
IS MANUFACTUREDFROM RAPESEED OIL

MIDEL eN 1204 is currently used in a wide range of transformer applications andis ideal for non free-breathing transformers located indoors or outside.
MIDEL eN 1204 offers the ability to safely increase transformer loadingor reduce transformer size.
Transformer fires are a frequent occurrence in the world’s power networks. Suchfires are notoriously unforgiving, spreading very quickly and causing extensive
damage, sometimes involving loss of life. MIDEL eN 1204 offers a proven solution
in terms of fire risk mitigation.
MIDEL’s engineers and chemists have built close working relationships with end
users and the major transformer manufacturers. They are also active in IEEE,
CIGRÉ and IEC working groups and regularly undertake extensive projects withindustrial associations and academic bodies. Such depth of experience allows theMIDEL team to provide an unrivalled level of expert technical guidance.

MIDEL®
SAFETY INSIDEMIDEL eN 1204 Fluid properties
Property

Standard Test Methods
ASTM

ISO/IEC

Requirement
ASTM D6871

IEC 62770

MIDEL eN 1204

PhysicalColour

D1500

Flash Point PMCC (°C)

D93

ISO 2719

Flash Point COC (°C)

D92

ISO 2592≥ 275

Fire Point (°C)

D92

ISO 2592

≥ 300

≥ 300

Pour Point (°C)

D97

ISO 3016≤ -10≤ -10-31≤ 1.00.92

Density at 20°C (g/cm3)≤ 1.0

ISO 3675

Relative Density (specificgravity) (15°C/15°C)

D1298

Viscosity (mm2/sec)

D445

0.5
≥ 250

> 260
> 315

≤ 0.96

> 350

0.92

ISO 3104@100°C≤ 15≤ 158.3

@40°C

≤ 50

≤ 50

37@0°C
Appearance

D1524

Visual examination

≤ 500

232

Bright and Clear

Bright and Clear

IEC 62770 4.2.1

Biodegradation - OECD 301

Clear, free from waterand suspended matterand sediment

Clear, free from water andsuspended matter andsediment

Readily Biodegradable

Readily Biodegradable

Electrical
Dielectric Breakdown (kV)

D877

≥ 30

≥ 301 mm gap

D1816≥ 20452 mm gap

D1816

Dielectric Breakdown (kV)

2.5 mm gap≥ 35
IEC 60156

57≥ 35> 75

Gassing Tendency (μl/min)

D2300≤0-46.1

Power Factor at 25°C (%)

D924

≤ 0.2

≤ 0.20Power Factor at 100°C (%)

D924

≤ 4.0

≤ 4.0

Dissipation Factor at 90ºC
(tan delta)

IEC 60247≤ 0.05< 0.03

Non-corrosive

Non-corrosive

ChemicalCorrosive Sulfur

D1275

Water Content (mg/kg)

D1533

IEC 60814

≤ 200

≤ 200

50

Acid Number (mg KOH/g)

D974

IEC 62021.3≤ 0.06≤ 0.06≤ 0.04PCB Content (mg/kg)
Oxidation Stability (48hr)

IEC 62535

D4059
ASTM D 2440

Non-corrosive

Not detectable

Not detectable

IEC 61125C

Total Acidity (mg KOH/g)

IEC 62021.3

≤ 0.6

< 0.1

Viscosity at 40°C(mm2/sec)

ISO 3104≤ 30% over initial

8%

Dissipation Factor at 90ºC
(tan delta)

IEC 60247

≤ 0.5

< 0.1

The displayed typical values are not to be identified as acceptance values.

MIDEL eN 1204 - manufactured using renewable vegetable oil, readily biodegradable,
providing fire safety and environmental protection from a natural ester.

MIDEL®
SAFETY INSIDEMIDEL®

SAFETY INSIDEMIDEL eN 1204

Fire and environmental protection in a natural ester fluid
MIDEL eN 1204 is an excellent dielectric fluid because it
has a high fire point, making it demonstrably safer thanmineral oil. It is also one of the most environmentallyfriendly dielectric fluids available; not only is MIDEL eN 1204
manufactured using renewable vegetable oil (rapeseed), it isalso non-toxic and readily biodegradable. In addition,
MIDEL eN 1204 offers superior moisture tolerance and has
the potential to increase the lifetime of cellulose based solid
insulation, which in turn can extend transformer life.

INCREASED FIRE SAFETY• 100% fire safety record• High fire point (>300°C)• K-class classification: Less flammable fluid• Designed for indoor and outdoor installations
GREATER ENVIRONMENTAL PROTECTION• Renewable vegetable oil• Lower carbon footprint than mineral oil• Readily biodegradable• Non-toxic• No corrosive sulphur

SUPERIOR MOISTURE TOLERANCE• Absorbs large amounts of moisture with no
reduction of breakdown voltage (up to 300ppm)• High saturation limit (1100ppm @20˚C) making
precipitation of free water virtually impossible
ASSET LIFE EXTENSION• Slower rate of cellulose ageing than mineral oil• Longer cellulose lifetime at standard temperatures• Option to run at a higher temperature, for astandard lifetime• Provides a higher power output, without the needfor high temperature insulation
ENABLES INNOVATION• Allows for compact transformer design• Permits greater flexibility and temporary
overload resilience

Any recommendation or suggestion relating to the use, storage, handling or properties of the products supplied by M&I Materials Ltd or any member of its group, either insales and technical literature or in response to a specific enquiry or otherwise, is given in good faith but it is for the customer to satisfy itself of the suitability of the productfor its own particular purposes and to ensure that the product is used correctly and safely in accordance with the manufacturer’s written instructions. FM® is a registeredtrademark of Factory Mutual Insurance Company. UL® is a registered trademark of Underwriters Laboratories. UL Classified as to fire hazard only. Classed 4 to 5 lesshazardous than paraffin oil in respect to fire hazard. © M&I Materials 2019.

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E: midelsales@mimaterials.com
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Version: April 2019

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