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® and WOLFMET®.

Whilst the other three brands can usually be found in a variety of applications in the Power Distribution and Scientific industries the WOLFMET® brand is firmly rooted in the Aerospace, Defence, Motorsport and Medical industries.

WOLFMET® is a high performance tungsten alloy which is commonly used to add balance or vibration damping mass, or as an effective shielding from radiation.

As well as being experts in the formulation and manufacture of WOLFMET® tungsten alloy our high-tech precision engineering department is also capable of manufacturing bespoke engineering components and assemblies from WOLFMET® to customer designs.

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.


Hibernia Way
Trafford Park
M32 0ZD


+44 (0) 161 864 5449





Our head office is housed on a 13,000m2 purpose-built site



Quality Certifications Held

ISO 9001, AS9100, ISO 14001

Other Certifications

British Safety Council - 2015 International Safety Award & The Queen’s Award for Enterprise: International Trade 2009.

Products and Services


Manufacture of WOLFMET® bar stock and precision engineered bespoke components from WOLFMET®  using customer designs. Components can be supplied with a range of surface treatments and finishes or integrated in to larger more complex assemblies. Examples of WOLFMET®  components include ballast weights, blade weights, anti-flutter weights, crankshaft balance weights and bucking bars. Visit the Wolfmet website


Apiezon is a range of high vacuum sealants, lubricants and etch resist products which are favoured because of their quality, consistency and excellent performance in vacuum applications. Apiezon products have an enviable track record in many fields ranging from aerospace to cryogenics and are the primary choice for high vacuum applications. Visit the Apiezon website

Customers in the UK and Europe can now buy small quantities of Apiezon high vacuum greases online from the APIEZON SHOP.


Metrosil non-linear resistors are high performance surge protection devices that provide excellent service in a wide range of applications. Metrosil is manufactured from a semi-conducting material with the distinctive property that its electrical resistance depends on the applied voltage enabling it to act as an ‘electrical safety valve’, protecting equipment and insulation from the effects of over voltages. Millions of Metrosil varistors have been sold throughout the world with current ratings varying from microamps to kiloamps and the capability of absorbing energies from 10 to 50,000 joules per disc. Visit the Metrosil website.


Midel is the world’s leading brand of ester-based dielectric fluids and is chosen by utilities and transformer manufacturers worldwide because of its excellent track record and ability to minimise risk.

We offer two types of ester – our synthetic ester MIDEL 7131 and our natural ester MIDEL eN, both provide the crucial combination of fire safety and environmental protection properties that are absent in mineral oil. They can also significantly extend the life of your transformers. Synthetic and natural esters have been successfully used in new and retrofitted liquid-filled electrical equipment installations for many years. To see how mineral oil compares to esters please visit our Fluids Comparison

Visit the Midel website


CNC Machining, CMM inspection, PFD and Ultrasonic NDT, FAIR in accordance with AS9102, Material test laboratory. CAD

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