Evening star., 1935-12-07
CHEMISTS WORK
HELPS BUILDING
New Construction Aids Are
Shown at 18th Display
in New York.

New chemical products which VIII
aid the building and construction
industry are featured in the Ameri-
can Chemical Society exhibit called
children Of the Recovery" tirst
shown at the Fifteenth Exposition OF
Chemical Industries In New York, De-
eember 2 to 7.
Like the Children of Depression"
display of the society two years ago,
the exhibit, 1t was pointed out, Illus
trates the essential role played by
research in stimulating business re-
vival. Hundreds of products devel-
oped in the laboratory during 1884
and 1885 are now manufactured on q
commercial basis and are finding Wild
ening use in industrial activity.
Clements, paints, dyes, lacquers,
resins, metals and plastics have been
improved through recent scientific
effort. A bright zinc which forms
iow-cost, decorative, rust-resistant
coating makes attractive finishes that
do not tarnish or show f1ngermarks.
Tt can be produced on steel surfaces
by a new electro-plating process IN
thicknesses up to three-thousandthS
of an inch.
Cement Increases Strength.
A cement especially suitable for use
with acid-pfoof brick strengthens a
structure so much that no other metal
shell is needed. 1t is low in cost, has
no upkeep expense and does not cor
rode. It is based on plastic sulphur
and has superior bonding strength and
resistance to thermal and mechanical
shock. A sister product is suitable
for producing bell and spigot joints
which are permanently leak-proof,
vibration and temperature resistant.
and cheaper than lead joints.
New caSein paint in paste form
Yields a film which does not discolor
or show the effects Of water, wear and
weather. 1t is valuable for painting
cement and plaster surfaces. A pro-
cess of manufacture of zinc sulphide
results in white pigment Of remark
able strength. 1t is recommended for
its excellent dispensing and Suspending
properties, its tint-holding power in
paints and plastics, and its freedom
from acidity in rubber.
Smooth surfaces on sprayed lacquer
coatings are secured without sanding
by removal Of all moisture during the
manufacture of the lacquer. Amyl
alcohol is used to dehydrate nitro
celluloSe before it is made into lacquer.
A non-hammable cellulose suitable
for protective coatings and nodded
plastics is cellulose nitoracetate. A
white odorleSS, fluffy material which
produces clear solutions when dis
solved in organic liquids, it is said to
supass cellulose acetate in moisture
resistance and in film properties.
Ethyl CeIIuIose Has Advantages.
Ethyl cellulose in a white granular
form has important advantages for
paints, lacquers and plastics. 1t is
stable in light and non-flammable
BY emulsifying nitro-celluloSe lacquers
both clear and pigmented, in water,
otherwise unsprayable lacquers can be
sprayed. Emulsification reduces fire
hazard and cost by minimizing the
III CAHCA1O4NC OOANC4At 4S
quired. It allows application Of
lacquer to porous surfaces, such as
paper, plaster, cement and other
building materials, without requiring
pre-treatment of the surface. Thus
emulsification opens new and i'm
portant fields to lacquers.
Another paint Ingredient is cellulose
Aceto-butyrate, from which lacquerS
are made that will not discolor, dis
integrate IN the sun, or absorb
moisture. It produces clear, flexible,
tough films that will adhere tenaci-
ously to metal. Its properties suggest
its use as an overcoat for outdoor
exposure, as on signs and filling sta
tions, as well as in clear coatings for
the protection Of polished metal, hard
ware, ornamental iron, and other
architectural materials where weather
exposure is encountered.
Paints formulated with ethyl silicate,
which Is employed as a preServative
for the hardening Of stone and n
arresting decay and disintegration, are
unaffected by heat and are suitable
for coating furnace castings. Mixed
with siliceous powders, the silicate
forms weather and acid-proof mortar
and cements as well as refractory
bricks and other nodded objects.
A synthetic resin finish, neo-spectra,
exemplifies a new principle in the
surface chemistry of carbon black.
Whereas ordinary high intensity color
blacks are difficult to wet with syn
thetic resin, this substance is vehicle
seeking instead Of vehicle-repelling.
It has been widely adopted in the field
Of resin enalnels.
Resins Therm0pIastic.
Plastic resins derived from q hgnin
hasa nxhihit remarkable fhernonlaStjc