What do a.m. and p.m. stand for?

mill scale

scale1 (def 6b).
Origin of mill scale
1875-80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for mill scale
  • Spot clean rusty areas to remove all rust and mill scale.
  • The above requirement does not apply to concrete form, mill scale and similar cleaning purposes.
  • Remove loose rust and mill scale and spatter, slag, or flux deposits.
  • Clean all surfaces of rust, mill scale, and apply prime coat of heat and corrosion resistant paint.
  • Clean the reinforcing bars of loose mill scale, loose rust, oil or other coatings that interfere with bonding.
  • High-pressure water can remove loose paint and rust, but will not efficiently remove tight paint or tight rust, or mill scale.

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