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172 Summary of Preservation
Plastic embeddinjg;
(1) Cleaning - The small artifact to be embedded
in plastic is cleaned by whatever method best suits its
composition and condition.
(2) Neutralization - The metal item, unless it
is too fragile, is bathed in alternating hot and cold
distilled water baths, until it tests negative for salts
and acids. Ordinarily organic materials do not require
neutralization before embedding.
(3) Drying - After the artifact is thoroughly
neutralized, it is simply blotted dry or dried in alco-hol
or ether baths
.
(4) Embedding - A smooth plastic mold of an ap-propriate
size for the artifact is filled one-third full
of clear plastic resin. As this layer starts to harden,
the artifact is positioned in the semi-hard plastic.
If the artifact starts to float, a small amount of resin
is poured over it. When the plastic starts to set with
the artifact firmly in place, the mold is completely
filled. When the plastic resin has fully hardened, the
artifact is removed from the mold. Once any rough sur-faces
are polished smooth, the artifact is ready for
exhibition.
Sandblasting
(1) Blasting - Bulky items are sandblasted to
bare metal using a standard sandblasting apparatus and
fine grit. The jet of sand and air under pressure simply
erodes away the outer deteriorated layer leaving the
metal bare. This method quickly removes concreted mater-ials
from large metal items.
(2) Neutralization - Before it is dried the arti-fact
is steam cleaned to remove any residue. To prevent
surface rusting during drying the artifact is coated
with manganesed phospholene #7.
(3) Drying - After the item is thoroughly neutral-ized,
it is dried in an oven at vapor point (approximately
200°F. ) for eight to twelve hours. Articles too large to
be placed in an oven are left to air dry.
(4) Coating - Depending on the item and its con-dition,
the dried artifact is coated with plastic epoxy
or vinyl. Exceedingly bulky items to be displayed
Object Description
Description
| Title | Page 236 |
| Full Text | 172 Summary of Preservation Plastic embeddinjg; (1) Cleaning - The small artifact to be embedded in plastic is cleaned by whatever method best suits its composition and condition. (2) Neutralization - The metal item, unless it is too fragile, is bathed in alternating hot and cold distilled water baths, until it tests negative for salts and acids. Ordinarily organic materials do not require neutralization before embedding. (3) Drying - After the artifact is thoroughly neutralized, it is simply blotted dry or dried in alco-hol or ether baths . (4) Embedding - A smooth plastic mold of an ap-propriate size for the artifact is filled one-third full of clear plastic resin. As this layer starts to harden, the artifact is positioned in the semi-hard plastic. If the artifact starts to float, a small amount of resin is poured over it. When the plastic starts to set with the artifact firmly in place, the mold is completely filled. When the plastic resin has fully hardened, the artifact is removed from the mold. Once any rough sur-faces are polished smooth, the artifact is ready for exhibition. Sandblasting (1) Blasting - Bulky items are sandblasted to bare metal using a standard sandblasting apparatus and fine grit. The jet of sand and air under pressure simply erodes away the outer deteriorated layer leaving the metal bare. This method quickly removes concreted mater-ials from large metal items. (2) Neutralization - Before it is dried the arti-fact is steam cleaned to remove any residue. To prevent surface rusting during drying the artifact is coated with manganesed phospholene #7. (3) Drying - After the item is thoroughly neutral-ized, it is dried in an oven at vapor point (approximately 200°F. ) for eight to twelve hours. Articles too large to be placed in an oven are left to air dry. (4) Coating - Depending on the item and its con-dition, the dried artifact is coated with plastic epoxy or vinyl. Exceedingly bulky items to be displayed |
