MIDEL 7131 synthetic este transformer fluid 25l canister (21,9kg transformer oil), model 2 *new*

MIDEL 7131 is a top-tier fire-safe transformer oil for demanding applications.

MIDEL 7131 is a synthetic ester-based transformer fluid designed to provide exceptional safety, performance and long service life in all critical utility and industrial applications. It is non-flammable (K-class fluid), biodegradable and an environmentally friendly alternative to traditional mineral oils. MIDEL 7131 significantly reduces fire risk, extends transformer life and improves heat transfer, making it the preferred choice wherever safety and reliability are essential.

Its excellent dielectric properties, high moisture tolerance and superior thermal stability make it an optimal fluid for both new transformers and refurbishments. Thanks to its stable chemical structure, MIDEL 7131 slows down the ageing of paper insulation and clearly increases overall transformer lifespan compared to mineral oils.

If you need a fluid that provides maximum safety, reduces maintenance costs and performs even in extreme conditions, MIDEL 7131 is one of the most reliable choices on the market.

Transformer oil technical specifications:

• Size:
  • 24,8kg / ~25l
    • Based on weighing 21,9kg of oil remains. Used amount 2,9kg. If you need smaller quantities, please contact our sales team and we will put together exactly the set you need. 
• Type:
  • Synthetic ester-based transformer oil (non-flammable, K-class)
• Dielectric strength:
  • Typically >75kV
• Kinematic viscosity:
  • ~28...32 mm²/s (40°C)
• Flash point:
  • >250°C
• Fire point:
  • >300°C
• Pour point:
  • -56°C
• Biodegradability:
  • >90% (readily biodegradable, OECD 301F)
• Moisture tolerance:
  • Very high, maintains dielectric performance in humid conditions
• Compatibility:
  • Suitable for most transformers, including units converted from mineral oil to ester oils
• Applications:
  • Distribution transformers
  • Industrial transformers
  • Offshore installations
  • Transportation infrastructure
  • Tunnels
  • Indoor installations

Download Midel 7173 synthetic ester transformer fluid technical datasheet