M&I Materials India Private Limited M&I Materials Limited is dedicated to manufacturing Specialist Materials for Industry and Science and is the driving force behind a portfolio of successful brands including Apiezon, Metrosil, Midel and Wolfmet. An independent company, M&I Materials Limited has built a strong global business based on delivering technical excellence and high standards of customer service to niche markets around the globe. Born out of the research division of GEC Alsthom, M&I Materials Limited combines the proven pedigree of long-standing products with the research and development expertise to bring new solutions to market.