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Storage & Handling

Storage & Handling

EMI/RFI Shields fabricated from Tinplate Steel Stock

Materials Spec: Cold Reduced Electrolytic Tinplate Steel
Tinplate Standard: TS275E8.4/8.4 EN 10202:2001

The material used to fabricate these shields are based on a mild steel with less than 0.12% Carbon and no more than 1% alloying elements and naturally occurring impurities. Major shielding elements are thus ferrous and tin. The thin resultant layer of tin enables shields to be soldered easily to pc boards as well as providing a corrosion resistant protection during the assembly process.

Tin plate shields are the most cost effective materials in the shielding screen family provided the following care is taken during storage and handling.

1. Do not pass these components through a salt bath test, they are not designed for such severe treatment, alternate materials (albeit more expensive) are available.
2. Frames should be left in package trays until assembly, the trays preserve the planarity of the shields.
3. Store in a cool dry place and avoid water or other liquids from coming into contact with shields.
4. Mild scratching and scuffs are natural for processed shields from pre plated material. Protective films can be ordered specially for unblemished finish of covers.
5. Extremely thin film of oil may cover some shields, this does not have any effect on solderability and does not have to be removed.

Tinplate shields constitute over 85% of the materials used in the Masach production programme and have proven effective in their respective applications.



EMI/RFI Shields fabricated from Nickel Silver Stock

Materials Spec: Cold Reduced Nickel Silver Alloy Strip (Temper- Quarter Hard)
Nickel Silver Standard: UNS C77000

Chemical Composition 55%Copper, 27%Zinc And 18%Ni. Major shielding elements in this alloy are copper and nickel. Reflow temperatures are slightly higher than tin plate components and the use of suitable fluxes are needed to avoid excessive oxidation.

Nickel Silver shields do not require extra plating due to their good solder ability, attractive finish and corrosion resistance.

1. Do not pass these components through a salt bath test, they are not designed for such severe treatment, alternate materials (albeit more expensive) are available.
2. Frames should be left in package trays until assembly, the trays preserve the planarity of the shields.
3. Store in a cool dry place and avoid water or other liquids from coming into contact with shields.
4. Mild scratching and scuffs are natural for processed shields from pre plated material. Protective films can be ordered specially for unblemished finish of covers.
5. Extremely thin film of oil may cover some shields, this does not have any effect on solderability and does not have to be removed.

Nickel Silver shields complement the Masach production programme and have proven effective in their respective applications.



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