Bolton Metals Limited, located in East Anglia near to the Suffolk coast has been manufacturing wrought copper alloys in Ipswich for nearly 100 years.


For many years Bolton Metals Limited has specialised in the production of high strength and corrosion resistant brasses and bronzes and due to continuous research and investment has maintained preeminence in this field. The exercise of quality control at all stages of manufacture is designed to ensure production of material to the highest metallurgical standards.

A wide range of copper based alloys are produced in the form of:

  • Cast billet
  • Continuously cast rod
  • Rectangles and hollows
  • Wrought rod
  • Bar
  • Section
  • Hollows
  • Forging and proof machined products
  • Material analysis is maintained using modern X—ray Fluorescence Spectrometry, ensuring repeatability of product.

A range of mechanical tests are available to ensure material meets the required properties,including Tensile, Hardness and Impact testing equipment.

Where required, Material can be tested ultrasonically to comply with international or customer requirements.

The company has held recognised third party approvals since 1992. This now takes the form of AS9IOO Rev C. A large range of customer approvals are also held. Most aerospace and defence end users utilise our product, as do many other major companies in other sectors such as petrochemicals and construction.



Factory funded

The UK Government funded a factory to produce extruded copper-zinc products for munitions and the Manganese Bronze & Brass Co. Ltd accepted responsibility for overseeing production at Ipswich.

First ever

The factory for wrought copper alloys was fully operational with rolling and extrusion facilities under the ownership of The Manganese Bronze & Brass Co.Ltd. It was one of the first company’s in the world to extrude aluminium bronze and other copper based alloys.


The London based company, situated on the Thames, produced four of the largest propellers ever made for vessel #534, The Queen Mary.

Alloys commence

Extrusion and rolling of special alloys commence at Ipswich.

Name change

From the 1st of January, the company name was shortened to Manganese Bronze Ltd.

Company conversion

The company was converted into a holding company called Manganese Bronze Holdings Ltd. Two subsidiaries were then subsequently established. Manganese Bronze Ltd to hold the wrought metals and a sintered materials division, both of which were based in Ipswich.

Sale of division

The sale of the Wrought Metal Division, group research laboratory and Sintered Materials Division was made to Delta Metal co. The company then traded under the name of Delta Manganese Bronze Ltd.

New owners

Company purchased by The Marmon Group. An American privately owned business and traded under the name of Cerro Manganese Bronze Ltd.

New owners

Company purchased by the Bolton Metals Group and re-named Bolton Manganese Bronze Ltd.

Name change

Company name changed to Bolton Aerospace Ltd.

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