What is the best material for a magnetic shield?

The most popular material being used today in the magnetic shielding industry based on its superior characteristics with respect to permeability and saturation is an 80 wt% nickel-iron alloy that conforms to MIL-N-14411C, Composition 1 and/or ASTM A753, Type 4 such as HyMu 80.

leadertechinc.com - Magnetic Shielding Basics and Materials | Leader Tech

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Magnetic Shielding Basics and Materials

Magnetic fields can pose a problem for electronic equipment, and attempting to shield for magnetic fields is not as simple and straightforward as for electric fields. No material is actually able to block magnetic fields without itself being attracted to the magnetic force. Unlike electricity, magnetic fields cannot technically be blocked or insulated, but can only be redirected. In general, high permeability materials, or those with the ability to support the formation of a magnetic field within themselves, are used for this purpose. When using a high permeability shielding enclosure to protect electrical components in the presence of a magnetic field, the shield works by diverting the magnetic flux and drawing the magnetic field lines into the shielding material rather than them passing into the protected space. The electromagnetic energy within the material is then dissipated and converted into heat, thus creating ohmic losses; this phenomenon is known as absorption loss. Absorption loss is the primary shielding mechanism to shield low frequency magnetic fields. The absorption loss achieved by a magnetic shield is directly proportional to the shield’s material thickness, the permeability of the material, the conductivity of the material, and the frequency of the incident wave. Therefore, the ideal material choice for magnetic shielding would be a thicker, high permeability and electrically conductive material. There are some overlooked aspects that need to be considered when choosing a magnetic material. The permeability of a material will in fact decrease as the frequency of the incident wave increases. For example, at 100 kHz the permeability of HyMu 80 is no better than cold-rolled steel. As a general rule of thumb, high permeability materials are ideal when dealing with frequencies below 10kHz. Another important factor is that the material’s effectiveness also depends on the magnetic field strength which it is being exposed to. High magnetic strengths can cause a material to become saturated, which will vary based on the thickness and type of the material being used. The most popular material being used today in the magnetic shielding industry based on its superior characteristics with respect to permeability and saturation is an 80 wt% nickel-iron alloy that conforms to MIL-N-14411C, Composition 1 and/or ASTM A753, Type 4 such as HyMu 80. Leader Tech maintains stock of this material in varying thicknesses, and can help assist with the design of your enclosure and offer recommendations for your specific magnetic shielding application. We at Leader Tech understand the need for magnetic shielding, and can help provide you with an appropriate and cost-effective solution for your unique application. In a future article, we will further explore the design considerations that need to be accounted for when designing magnetic shielding enclosures.

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Do you need an air gap under metal roofing?

Research has confirmed that creating an air space under a metal roofing system will increase energy savings during both summer and winter months.

bdcnetwork.com - How does airflow under a metal roof further enhance energy savings?

Metal roof coatings with solar reflectance can help building owners save substantially in annual cooling costs. Research has confirmed that creating an air space under a metal roofing system will increase energy savings during both summer and winter months. A study was funded by the U.S. Department of Energy and conducted by the Oak Ridge National Laboratory to document energy savings of metal versus asphalt roofs. Scientists selected an asphalt shingle and a stone-coated metal shake for field-testing—both had comparable solar reflectance and thermal emittance levels. The asphalt shingle was directly nailed to the roof deck, with no air space underneath, while the dark-gray metal shake was attached to a batten/counter-batten system that allowed for airflow underneath. The result yielded a 45-percent reduction in heat flow for the metal shake; about 15 percent of that reduction was attributed to solar reflectance, and an additional 30 percent of the heat flow reduction was due to above-sheathing ventilation. In cool or cold weather conditions, scientists confirmed that direct-nailed asphalt shingle roofs had significantly larger heat loss than attics with metal shakes and above-sheathing ventilation. The air gap appears to serve as an insulating layer, reducing heat transfer by 50 percent as compared to asphalt. The study results have been corroborated by Florida Solar Energy Center and accepted by the ASHRAE SSPC 90.1 subcommittee, indicating that any type of metal roof can save a home or building owner up to 25 percent in annual cooling energy costs compared to a dark-gray asphalt shingle.

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Can I build my own shed?

Yes, with the right plans you can build your dream shed.

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