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Fragment
FRAG code for HBMC
Building or Place
NPS Code
Address
Number of Samples
Plaster and lath, two sets of nail holes, cut nail and sawn lath, few remaining split lath and wrought nails.
0
Plaster and white marble from the south interior wall of the Fleisher Art Memorial Sanctuary in Philadelphia, Pennsylvania
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Air-entrainment is generally used in exterior environments where freeze-thaw events are present. Air-entrainment significantly increases durability against freezing by creating millions of microscopic, protective air bubbles (typically 4-7% total volume), resulting in a more porous, less reflective, and less dense surface. It is notoriously difficult to polish. Air-entrainment was discovered accidentally in the 1930s.
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