M&I Materials Ltd (MIDEL)
Pioneering manufacturer of MIDEL® 7131 synthetic ester fluid for high-fire-point and cold-climate applications, and MIDEL® natural ester fluids for sustainable green power transformers.
Product categories
Transformer oil / ester fluids
Related components
Company record
| Company | M&I Materials Ltd (MIDEL) (M&I Materials) |
|---|---|
| Role | PRIMARY_MILL_MANUFACTURER |
| Location | Manchester, Greater Manchester, United Kingdom |
| Accessory categories | Transformer oil / ester fluids |
| Product family | Synthetic & Natural Ester Dielectric Fluids |
| Product / Trade names | MIDEL 7131 (Synthetic Ester), MIDEL eN 1204 / 1215 (Natural Ester) |
| Thermal insulation class | Synthetic & Natural ester dielectric fluids (Fire point >300°C / Class K) |
| Documented grades | Synthetic ester: IEC 61099; Natural ester: IEC 62770 |
| Technical standards | IEC 61099 (Synthetic), IEC 62770 (Natural), IEEE C57.147 |
| Founded | 1901 |
| Primary evidence citation | M&I Materials MIDEL technical manual & UL / FM approvals |
| Source tier | TIER A |
| Provenance | Sourced — not a product certification · Source: official website · checked 14 Sept 2026 |
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