Stock sizes in multiple durometers
Associated Spring Stock Urethane compression springs are designed to
complement our steel wire springs. These springs are designed for use
in applications where corrosion, vibration, and magnetism prevent the
use of a conventional steel spring. The SPEC line of urethane springs
feature multiple durometers. This allows various load capacities within
each specific size. SPEC urethane springs are compounded specially for
optimized spring characteristics. Typical applications include vibration
dampening, corrosive environments, high loads in confined spaces, cycle
and static loading and nonmagnetic requirements. 
Properties
Water and oil resistant.
Nonmagnetic.
360 degree contact area.
Bondable to mating parts.
Can be mated to soft materials.
Series stackable for additional deflection with use of spacers.
Material
Urethane rubber
Durometers of 60A, 80A, 90A, 95A.
SPEC urethane is compounded to provide optimum spring characteristics.
Loading Applications
Urethane is a noncompressible material. The load of a urethane spring
is obtained by bulging of the tube walls. Most of the bulging is to
the outside diameter. The growth in outside diameter is approximately
equal to the percentage of spring deflection. Example: A 1.00" spring
is deflected 0.20" or 20%. Increase the outside diameter by 20%. A spring
with an initial outside diameter 0.750" would bulge to 0.90". This expansion
should be considered when selecting O.D. clearances.
Note: Load data shown is from laboratory testing. Load-deflection curves for
95A durometers are not provided due to extremely high spring rates. 95A durometer
is recommended for cushioning applications only.
Inside Diameters
Urethane springs can be guided through the I.D. by a rod. The rod
can be that of the size listed in the data tables for an interference
fir whereby the spring I.D. grips the rod. Or, the rod can be reduced
for a free fit. |
