Mimasu Semiconductor Industry
A Gunma-based company that processes silicon wafers on contract, from slicing to mirror polishing and cleaning, with close ties to Shin-Etsu Handotai, and also reclaims used wafers.
三益半導体工業・Wafers, substrates and photomasks・Last updated: October 27, 2026
Overview
Mimasu Semiconductor Industry is headquartered in Gunma Prefecture. It takes on the series of steps that turn an ingot into a finished wafer: slicing, edge grinding, lapping, etching, mirror polishing and cleaning.
It works closely with Shin-Etsu Handotai and processes 300 mm wafers in volume. It also runs a wafer reclaim business.
Business: Contract silicon wafer processing and reclaimed wafers
Why it matters
- Some wafer makers outsource individual processing steps, and Mimasu shows where that work is done.
- Gunma, north of Tokyo, is close to several of Shin-Etsu's wafer sites.
Main products
- •Contract wafer processing (slicing, lapping, polishing, cleaning)
- •Reclaimed wafers
Sites in Japan
Head officeHeadquarters
Gunma