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A lead foil backing with a rubber adhesive, offering excellent conformability in a variety of application conditions, indoors and out.
It is used as a maskant in electroplating and chemical milling, and as a moisture and/or radiation barrier.
For smooth mask-off edges during electroplating due to the ability of the backing to conduct electricity.
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| By squeezing down the edge of the electrical conductive backing you will achieve a contact with the metal part. |
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| It is also used as a more conformable solution for paint strip masking. |
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| Tape 421 linerless lead foil tape is most suitable got caustic milling of aluminium and is used for patching rubber-based maskant, and ˇ§tool holesˇ¨ in caustic chemical milling. |
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| It conforms easily to irregular surfaces. |
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| Features of tape 421: malleable (conformable), chemical/moisture resistant, electrically conductive backing, opaque to X-ray. |
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| Tape 421 is used during X-ray inspections to help determine the position of possible defects. |
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| The lead foil backing can be seen on the X-ray. |
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| Type |
Description |
| Colour |
Dark silver |
| Backing |
Lead foil |
| Adhesive |
Rubber (cream) |
| Total thickness |
0.15 mm (6 mils) |
| Peel adhesion to steel |
38 N/100 mm (35 oz./in. width) |
| Tensile strength |
298 N/100 mm (17 lbs./in. width) |
| Elongation at break |
10% |
| Operational temperature range |
-54˘XC to +106˘XC (-60˘XF to +225˘XF) |
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