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DESIGNS IN THE NEWS
uce weight without
sacrificing strength
with ALUMINUM
castings from
KILLARK
To improve your product . . . consider Ki I lark
aluminum alloy castings. They’re strong and
durable . . . machined or finished to pinpoint
tolerances . . . yet weigh considerably less than
castings in other metals. And they never rust or
deteriorate.
SPECIALTY CASTINGS DIVISION
Killark Electric Mfg. Co.
3940 Easton Ave. • St. Louis, Mo. 63113
In Canada: KILLARK OF CANADA
Founded 1913
EASTMAN 910 Adhesive bonds inked rubber
to plastic, takes hard
Both voting and vote counting are now
faster and easier, thanks to Cubic Corpora­
tion of San Diego, California, and EASTMAN
910 Adhesive. Cubic manufactures not only
a computer-like vote tabulating machine,
called Votronics vote counter, but also a
special device used by voters for marking
their paper election ballots.
This device consists of an inked rubber
tip, ^-inch in diameter, bonded to the base
of a plastic body and protected by spring-
loaded retractable prongs. To enable the
markers to withstand the hard knocks of
continuous use by voters, the inked tip is
bonded to the base with a small amount of
EASTMAN 910 Adhesive. The company has
produced over 130,000 markers to date,
and because of the exceptionally high
Here are some of the bonds that can be made with versatile
Among the stronger: steel, aluminum, brass, copper, vinyls, phenol
polyurethanes, nylon; butyl, nitrile, SBR, natural rubber, most types
Among the weaker: polystyrene, polyethylene (shear strengths up to
See Sweet’s Product Design Catalog File
KILLARK
■ ocean environment. At 20,000 ft, the pressure is I
. SPECIALTY CASTINGS OiViBlOtM
i 1 !•»»!•* *»» • KIUVI iI e<M«a
. .
WRITE FOR THIS NEW FREE BROCHURE
Full color brochure shows typical Killark castings,
custom-cast or modified from standard castings in the
Killark line. Also shows manufacturing and quality con­
trol operations. Write for your free copy today.
Circle Service No. 22
knocks from voters
strength of the bond, not a single failure
has been reported.
EASTMAN 910 Adhesive is versatile, will
form a bond with almost any kind of ma­
I terial. It requires no heat, solvent evapora­
tion, or catalyst. Offers fast setting, high
strength and low shrinkage. Comes ready
to use, cures at room temperature with only
contact pressure. And gives approximately
20 one-drop applications for only a nickel.
Try EASTMAN 910 Adhesive on your
toughest bonding jobs. For technical data
and further information, write Chemicals
Division, EASTMAN CHEMICAL PRODUCTS,
INC., Kingsport, Tennessee. EASTMAN 910
Z Adhesive is distributed by Armstrong Cork
f Company, Industry Products Division, Lan­
caster, Pennsylvania.
t
EASTMAN 910 Adhesive
ics, cellulosics, polyesters,
of neoprene; some woods.
150 Ib./sq. in.).
See Sweet’s Product Design
Circle Service No. 23
Testing Deep-Ocean
Materials
— Sunnyvale, Calif.— Called syntactic f.oam, a
buoyancy material is composed of millions of tiny
glass bubbles ranging in size from thousandths of
an inch to hundreds of thousandths of an inch in
dia. The glass spheres are bonded together by an
epoxy-resin plastic material. The syntactic foam is
designed to give added buoyancy to research sub­
marines. Such buoyancy materials are needed to
counterbalance the extreme weight of research
subs. is testing
Lockheed’s Palo Alto Research Lab.
the ability of different foams to survive the deep- ■
approximately 10,000 psi.—Through the tests, I
scientists hope to discover how stressing the I
syntactic foams in one direction will affect the I
ultimate strength of the material when stressed in
another direction. In testing, the foam is loaded to I
simulate the pressure of a deep dive. The load is
removed for a short period and then an increasingly
heavy load is applied in another direction until the
foam fails. By studying hundreds of failure tests,
scientists will find ways to improve strength and
reliability of buoyancy materials.
According to Dr. Oscar Hoffman of the Aerospace
Sciences Lab., syntactic foams today can give ap­
proximately 28 lb of positive buoyancy per cu ft.
Buoyancy material of this grade now is being used
by Lockheed’s Deep Quest research submarine.
Many scientists are working on materials that will
give up to 34 lb of positive buoyancy. Dr. Hoffman
says that the problem is not in achieving a highly
buoyant material but rather in developing a ma­
terial both buoyant and strong enough to with­
stand even greater pressures than present syntactic
foams. Ultimately, syntactic foams may become
unnecessary for research submarines should ef­
forts to develop stronger, yet lighter, materials
for submarine pressure hulls prove successful.
W A
1 A ’
_________ -
Pieces of syntactic-foam buoyancy material taken from
chamber that subjected material to crushing pressures
are examined by Dr. Oscar Hoffman, left, and Dr. John
Catalog File DeRuntz of Lockheed Missiles & Space Co. Chamber
routinely can produce pressures up to 20,000 psi.