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Specialist Materials for Industry and Science

Welcome to M&I Materials 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®, MIVOLT® 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.

Our products

APIEZON

A range of specialist greases, waxes and oils for industrial and scientific high vacuum process applications.
Apiezon website

METROSIL

A range of non-linear resistors used to protect equipment and electrical insulation from the effects of over voltages.
Metrosil website

MIDEL

A range of ester-based dielectric fluids, chosen by utilities and transformer manufacturers because of its proven ability to minimise risk.
Midel website

MIVOLT

Biodegradable dielectric fluids for the direct immersion cooling of electrical systems, including EV batteries and charging stations.
MIVOLT website

WOLFMET

Tungsten heavy alloy for adding balance or vibration damping mass and providing an effective radiation shield.
Wolfmet website



  • Apiezon
  • Metrosil
  • Midel
  • Wolfmet

Products of M&I Materials Ltd.