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MIDEL 7131 is an environmentally safe alternative to conventional dielectric fluids. The Federal German Office for the Environment has classified it as ‘non-water-hazardous’ and it is recognised as ‘readily biodegradable’ according to OECD standards. It is the preferred dielectric fluid for transformers in environmentally sensitive locations, and is suitable for operation at high voltages (>36kV). It has been used in transformers without any reported fire incident since 1978. As a synthetic ester, MIDEL 7131 complies with IEC 61099. Pauwels SLIM and Bio-SLIM transformers both comply with the new IEC 60076-14 standard.