Magnetic Shields Ltd

Magnetic Shielding

Please contact Magnetic Shields for top quality magnetic shielding solutions. From small cans of 12mm diameter through to room size shields, we have the facilities and capabilities to meet all requirements. Our highly skilled team can create individual multiple layer shields, capable of screening down to very low levels, through to high volume production runs of over 50,000 pieces a week for use in the commercial industry. We manufacture magnetic shields from high grade mu metal® to ASTM A753 Alloy 4 which is annealed in a hydrogen atmosphere for optimum performance and reliability.

Toroidal Cores

Our high accuracy current measurement cores are widely used in power distribution systems, railway networks and large pieces of energy consuming industrial equipment. They are produced from an ID of 50mm up to a maximum of almost 1000mm and in strip thickness ranging between 0.1mm and 0.35mm. Cased or fixed cores can be supplied to suit specific customer requirements. Here at Magnetic Shielding we use extensive heat treatment processes and guarantee mu-metal™ cores are of the extremely high quality and consistency. Alongside our cores we also offer Magnetic GmbH’s extensive range of wound products in both crystalline and nano-crystalline materials.

Heat Treatment

All of our magnetic shields undergo specialised heat treatment processes in order to develop maximum permeability and to achieve optimum characteristics. Our highly skilled and qualified team of engineers work with a range of seven controlled hydrogen atmosphere heat treatment furnaces that are able to heat treat a wide range of shield sizes. The furnaces feature the latest NADCAP approved computer controlled chart recorders which enable us to create high quality products with full traceability and to comply with 21 CFR Part 11 Electronics Records and Signatures requirements. We can also provide complete audit trail information. Magnetic Shields provides first class sub-contract heat treatment services for nickel iron, cobalt iron, stainless steel and pure iron materials.

Special Materials

Our experience in the industry enables us to source a range of top quality materials from reliable suppliers. Our in-house metallurgists have a wealth of experience with special materials and are on hand to provide information, advice and assistance where needed. We largely help customers to source nickel iron alloys, cobalt iron alloys, special stainless steels and copper alloys in a range of forms. We can also source various refractory metals and titanium. Please contact the team at Magnetic Shields with your requirements.

Deep Drawn Cans

Magnetic Shields has provided the industry with an excellent range of deep drawn cans for a number of years as shielding solutions for small components such as specialist transformers, current transformers and other types of discreet components. Various round and square/ rectangular cans are available in a range of heights and with different lids. They can fit internally or externally to suit customer requirements. Alongside our standard range of deep drawn cans we provide a tooling service whereby we can provide solutions to suit specific requirements. Deep drawn mu metal cans can be manufactured in a range of thickness and alloys depending on the exact shielding requirements.

Shield Design

Magnetic Shields works closely with customers in order to achieve the most effective solutions. We ask customers to provide the following information:

• Magnetic Properties: what is the minimum attenuation needed? What is the field strength and frequency level of the field to be protected against?
• Geometry: Geometry of the requested shield, Dimensional tolerances, Average space available, Maximum and minimum internal and external dimensions. Is a drawing available? If not, Magnetic Shields can assist with our state of the art 3D modelling and simulation software
• Appearance: Surface aspect required for the shield.
• Service Conditions: will the shielding be subjected to thermal or mechanical stresses or possible corrosion attack?

CNC Processing and Automation

Here at Magnetic Shields we are pleased to boast a fantastic range of state of the art CNC controlled equipment. We process components on our fantastic 2500w LVD Orion laser in order to create high quality and highly accurate results with edge finishes completely free from oxidisation. The Orion also cuts nickel based alloys and stainless steels to 8mm thick, aluminium up to 6mm thick and carbon steel/pure iron up to 16mm thick. Our CAD/CAM equipment also enables us to assist with 3D modelling, stress analysis and preparation of drawings to customer specifications. We can accept and work from customer drawings in a range of formats such as DXF, DWG, IDW, IPT, IAM, STEP, SAT and IGES. We also work with a range of machinery capable of fully automated procedures on various components.

Measurement & Analysis

Magnetic Shields provides customers with accurate data at all stages of production from pre-manufacture site testing/ field measurement through to post-manufacture permeability and magnetic performance testing. Our services include: Helmholtz Coil Testing, Permeability Testing utilising LabVIEWTM technology, Hall affect probe testing and hardness and tensile testing. Our inspection/ test department offers First Article Inspection reporting (FAI) Certificates of Conformity and Certificates of Analysis. We also use laser/camera inspection technology for certain applications. Please contact Magnetic Shields to find out more about our measurement and analysis services.

Precision Sheet Metal

We also provide customers with a high quality, precision sheet metal service. Our skilled team of engineers work with a range of materials including mild steel, stainless steel, aluminium, brass and copper as well as various alloys. We also provide a range of welding services including: MIG, TIG, Microplasma and Micropulse TIG.  Please contact our friendly team at Magnetic Shields with your requirements or to find out more about our precision sheet metal services. We look forward to hearing from you.

Mu Metal Cans

Magnetic Shields offers a wide selection of small cans suitable for magnetically shielding discrete components. Our excellent deep drawing and fabricating facilities enable us to produce high quality round and square cornered cans in a range of quantities. All cans can be supplied with tight fitting lids featuring customised lead through holes to suit customer requirements. They also feature full magnetic anneal and are supplied ready to use.

Mu Metal Sheets

We also supply soft magnetic alloy sheet materials featuring the highest permeabilities combined with the lowest coercive forces and magnetic losses in the low frequency range. We boast the largest stock of shielding materials in Europe and can supply mu metal in gauges ranging from 0.35mm to 5mm in sheet form and various gauges in foils down to 0.05mm thick. We also offer various cold rolled, stress annealed mu metal to ASTM A753-97 Alloy 4 specifications which is complimented by smaller ranges of cryogenic mu metal. We are ISO 9001:2008 registered and all materials can be supplied with complete certificates of analysis and conformity.

Mu Metal Shields

Magnetic Shields has been providing first class magnetic shielding from mu metals and other alloys since the company was established back in 1957. We have a wealth of knowledge and experience in all areas of specialist production and provide customers with outstanding shielding solutions. From design assistance through to manufacture and heat treatment we have the knowledge, capabilities and facilities to produce incredible results. All of our services are carried out in-house which enables us to guarantee the quality of production.

Mu Metal Cores

In 2009 we expanded our services in order to produce high accuracy current measurement cores for a wide range of high current applications. Our mu metal® toroidal cores are produced in our fully integrated production facility based in Kent and are heated in our highly specialised hydrogen atmosphere treatment furnaces. Our team uses the top qualities of mu metal to ASTM A753 alloy 4 in order to produce high quality cores that are typically used in applications such as power transmission systems, rail networks and more.

Mu Metal Foil

Mu metal foil is widely used in delicate applications where the highest permeabilities combined with the lowest coercive forces and magnetic losses in the low frequency range are required. Using our in-house foil slitting machinery we are able to create a range of slit widths to suit customer requirements. We can also offer foils with a magnesium methylate coating or self-adhesive backing. All materials are stress annealed for stamping/ fabrication purposes and receive a final anneal to achieve optimum magnetic properties after fabrication. We also offer a complete range of hydrogen heat treatment services and can supply sheet in final magnetic anneal condition in restricted lengths.

Latest News

Please visit our website to view our latest news entries. Here you can find out what’s been going on at Magnetic Shields. Recent entries include: Magnetic Shielding Doesn’t Need to Cost the Earth, Magnetic Shields Invests for the Future, and Magnetic Shields to Exhibit at Electronica 2012 in Munich.

Environmental Consideration

Magnetic Shields is passionate about the environment and follows strict controls and procedures in order to consider and reduce its environmental impact. We are pleased to have attained the international environmental accreditation ISO 14001: 2004 in 2007. As a company, we follow a ‘green policy’ when purchasing and we actively analyse new and existing processes in order to minimise environmental impact as much as possible. The introduction of our balanced phase power distribution unit also enables us to save up to 10% on energy consumption making a considerable reduction in size of our carbon footprint.