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V24 2021 INDEX       E-SYLUM ARCHIVE

The E-Sylum: Volume 24, Number 14, April 4, 2021, Article 10

VOCABULARY TERM: DEBONDED, DEBONDING

Here's another entry from Dick Johnson's Encyclopedia of Coin and Medal Terminology. This is a short one, but I thought it would be a good follow-on to last week's entry on clad coinage; specifically, what happens when the cladding comes apart - either by mistake or on purpose. I added an image from Error-Ref.com. -Editor

Debonded, Debonding. The separation of an outer clad layer of metal either before or after striking. It is caused by poor adhesion during the bonding process. On a struck piece debonding is considered a clad metal anomaly because of the incorrect preparation of the strip and planchet. It would be described in numismatic literature as a lamination error. The purposeful debonding (as with skeleton scrap) to recycle the metal is accomplished by heating the clad strip to a specific temperature, holding the metal at that temperature until the bond weakens, then physically pulling apart the separate layers.

Undated clad layer from a Roosevelt dime1 Undated clad layer from a Roosevelt dime2
Undated clad layer from a Roosevelt dime (Courtesy Heritage Auctions)

To read the Error-Ref.com article, see:
Struck Clad Layer: Split Off After Strike (http://www.error-ref.com/struck_clad_layer_split_off_after_strike/)

To read the complete entry on the Newman Numismatic Portal, see:
Debonded, Debonding (https://nnp.wustl.edu/library/dictionarydetail/515672)

To read the earlier E-Sylum article, see:
VOCABULARY TERM: CLAD, CLADDING (https://www.coinbooks.org/v24/esylum_v24n13a13.html)



Wayne Homren, Editor

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