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All standard CDM steel springs are made of high quality steel based on Chrome and Vanadium, corrosion-protected by means of a coloured epoxy coating. All springs are designed following the german norm DIN-2089, and behave linear until blocking-state. Altough the theoretical plastic limit is usually situated below the block-limit, the permanent deformation beyond this plastic limit is small and of no real significance.
A spring shows practically no damping. When damping at resonance is required, for instance for stability reasons of the suspended system, the springs can possibly be combined with damping layers (for instance by partly embedding in initially liquid rubber) or damping cilinders (friction / viscous damping). This way, loss factors up to 10% can be reached for the isolator unit.
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There are 5 standard spring families, each containing one or more standard springs (every spring comes with a separate technical datasheet):
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2,5Hz springs: 1 type: 3,3kN H = 160mm
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3,5Hz springs: 2 types: 18,5kN - 73,6kN H = 165mm & 185mm
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4,0Hz springs: 4 types: 0,5kN - 1,0kN - 2,0kN - 4,0kN H = 75mm
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4,5Hz springs: 2 types: 1,35kN - 4,0kN H = 50mm
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5,0Hz springs: 1 type: 0,15kN H = 40mm
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