formaldehyde - Sciencemadness Dot Org

COMMERCIAL FORMALDEHYDE SOLUTIONS 45
coating materials, such as certain asphalt-base paints, phenolformaldehyde
resin varnishes, or rubber preparations. However, such storage vessels
are not as satisfactory as those constructed from the materials recommended
above,
According to Homer 12 , reinforced concrete tanks lined with asphalt and
acid-resistant brick are highly satisfactory for the bulk storage of formalde-
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5
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5
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9* METHANOL
Fig. 9. Effect of methanol on storage temperatures at which polymer is precipitated
from 37 per cent formaldehyde solutions after 10 to 12 days.
hyde* Concrete which has been coated with molten paraffin after thorough
drying is also suitable, and will last without relinhig for a considerable time.
Wood shrinks on exposure to formaldehyde and for this reason is not
entirely suitable for use in bulk storage, although properly constructed
barrels are used- Formaldehyde solution in contact with wood may extract
a small amount of resinous material and thus become discolored. If
the solution is also in contact with iron or copper, deep colorations ranging
from blue to black may result. This does not impair solution strength
nor render it unsuitable for many ordinary uses. If discoloration is objectionable,
exposure to these materials should be avoided.