scab

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Scab

In organized labor, an employee who breaks a strike. That is, a scab does not go on strike with other employees but instead keeps working. A scab may do this out of concern for his/her livelihood, because he/she does not agree with the reasons for striking, or for some other reason. Because scabs are thought to reduce the effectiveness of a strike, the term is highly derogatory.

‘scab’

see BLACKLEG.
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Besides scabbing, low carbon levels can cause pinholes and poor peel.
If wet tensile strength is too low, scabbing, rattailing and buckles may be a problem, since these defects are caused by weak wet layers that form in the mold.
Spalling or Scabbing - The ceramic shell that spalls or scabs not only causes a positive metal-type defect, but the ceramic is generally distributed throughout the casting to cause inclusions.