Key highlights
- Mitsui Chemicals' mass-balance biomass plastics were adopted by Toshiba Industrial Products and Systems for molded transformer plastic parts and extra-high-voltage coils.
- Use complies with Japan's third-phase Top Runner transformer energy-efficiency standards, which took effect in April 2026.
- Mitsui Chemicals switched to biomass-based raw materials for epoxy resins and polycarbonate resins used in these components.
- The change replaces petroleum-derived materials while maintaining equivalent physical performance and supports carbon-neutral value-chain efforts.
Adoption for transformers
Mitsui Chemicals' mass-balance biomass plastics were adopted by Toshiba Industrial Products and Systems for plastic parts in molded transformers and for coils in extra-high-voltage molded transformers.
Regulatory compliance
These components comply with Japan's third-phase Top Runner transformer energy-efficiency standards that took effect in April 2026 and support lower emissions across the value chain.
Materials and performance
Mitsui Chemicals switched the feedstocks for epoxy resins and polycarbonate resins to biomass-based raw materials via a mass-balance approach; the resulting plastics maintain physical properties equivalent to petroleum-derived materials.
