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INTECH Power-Core™ Gears General Info.
Power-Core™ gears are made by integrally casting a polyamide 12 nylon outer ring with a metal knurled hub. After
cooling, the gear blank is virtually stress-free and can be precision machined to provide gear teeth.
The metal hub used on this gear reduces thermal expansion. Gear calculation for Power-Core™ gears does not
require backlash compensation because of swelling, due to very small moisture absorption.
NOTE: It is important to understand that
testing procedures permit manufacturers to
measure tensile strength directly after extrusion,
or in a dry state and before submersion.
Therefore, the values used in the "Physical
Properties Table" are only theoretical and may
be misleading for two reasons:
• After production, most nylons are submerged
in water to relieve internal tension.
• Operating environments may present still
different and varying degrees for moisture.
This information is for reference only; to supply
actual durability information, we will be glad to
perform a durability calculation for your specific
application.
Moisture absorption versus tensile strength
10.2 x 103
8.7 x 103
7.3 x 103
5.8 x 103
4.4 x 103
2.9 x 103
1.5 x 103
1.5
3
6
9
Moisture absorption (%)
Nylon 6/6
Nylon 6
Cast Nylon 12
With moisture absorption, tensile strength of nylon 6 can drop
to below 20%, while for cast nylon 12 it remains stable within
90% of its original value.
Dimensional change
polyamides versus moisture
3
2
1
2
4
4
8
10
Moisture content (%)
Nylon 11
Cast Nylon 12
Nylon 6
Nylon 6/6
0.037 lb/in3
0.304 (Static)
358°F
108 Rockwell R
0.047%
Density
Coefficient of Friction
Melting Point
Hardness
Water Absorption
Compressive Stress at 0.1% compr.
Extension Stress
Tensile Strength (ultimate)
Elasticity Modulus
Flexural Modulus
Elongation
6,500 PSI
8,500 PSI
8,400 PSI
2.95 x 105 PSI
3.04 x 105 PSI
16%
Physical Properties Table
Mechanical Characteristics
Physical Characteristics
