Types of anti-vibration mounts compared:
rubber, helical spring and stainless steel wire rope
In vibration control, choosing the wrong type of anti-vibration mount can lead to resonance, accelerated component wear or structural failure. Each technology addresses specific operational requirements — none is universally superior. This guide compares the three most widely used solutions with technical data to support correct sizing.
High damping, compact, cost-effective. Ideal for medium-to-high frequencies. View products →
Excellent low-frequency isolation, long service life, high load capacity. View products →
Multi-directional, corrosion-resistant, shock-absorbing. For harsh environments. View products →
1. Rubber anti-vibration mounts (elastomer)
How they work
Rubber anti-vibration mounts exploit the elastic deformation of the elastomer to absorb and dissipate vibratory energy. The material combines controlled elasticity, high internal damping (loss factor η typically between 0.1 and 0.5) and the ability to accommodate minor mounting irregularities. The natural frequency of these systems generally falls between 8 and 25 Hz.
Advantages
- High internal damping: energy is dissipated rapidly, limiting oscillations during machine start-up and shutdown.
- Compact and lightweight: ideal where space is limited or weight is a design constraint.
- Easy installation: no special tools or routine maintenance required.
- Low cost: an economically efficient solution for standard applications.
- Good performance between 10 and 200 Hz: covers the most common frequency range in light industrial machinery.
Limitations
- Sensitivity to extreme temperatures: performance degrades significantly below –20 °C and above +80 °C.
- Ageing over time: the elastomer loses elasticity through oxidation and thermal cycling. Typical service life: 5–10 years.
- Lower effectiveness at low frequencies: below 5–8 Hz, isolation performance is insufficient.
- Limited resistance in aggressive environments: oils, solvents and chemical agents can degrade the material.
Typical applications
- HVAC systems and air conditioning
- Industrial fans and light compressors
- Small to medium pumps and electric motors
- Light mechanical machining equipment
- Electrical cabinets and electronic equipment
2. Helical spring anti-vibration mounts
How they work
The metal spring introduces very low vertical stiffness, significantly lowering the natural frequency of the system. Helical spring mounts can achieve natural frequencies of 1–3 Hz, compared to the typical 8–15 Hz of elastomers, providing far more effective isolation for slow-speed machinery. They are not subject to chemical degradation and maintain their mechanical properties far more stably over time than elastomers.
Advantages
- Excellent low-frequency isolation: ideal for rotational speeds below 600 rpm or excitation frequencies under 5 Hz.
- High load capacity: available for loads from a few kilograms to several tonnes per support point.
- Long-term stability: steel does not age like rubber; service life typically exceeds 20 years.
- Predictable and calculable performance: stiffness k is constant and measurable, simplifying analytical sizing.
Limitations
- Low intrinsic damping (ζ < 0.05): near the natural frequency, the system may amplify vibrations. Additional damping elements are often required.
- Larger footprint: more vertical space is needed, along with anti-rocking guide systems.
- Lateral instability: without appropriate restraint systems, horizontal oscillations may occur.
Typical applications
- Thermal and energy plants
- Large-scale generator sets
- Heavy machinery for mining and oil & gas industries
- Industrial lines with large moving masses
- Plants subject to low-frequency excitation
3. Stainless steel wire rope isolators
How they work
Wire rope isolators use braided stainless steel cables that operate through three combined mechanisms: flexural deformation of the cable, internal friction between the strands (the primary damping source) and multi-directional response to loads. The natural frequency is adjustable between 5 and 50 Hz depending on the configuration.
Advantages
- Corrosion resistance: AISI 316 stainless steel ensures full functionality in saline, marine and high-humidity environments.
- Multi-directional operation: absorbs loads on all three axes without a preferred orientation.
- Extreme environment resistance: operational from –60 °C to +250 °C with no degradation of mechanical properties.
- Long service life: no organic materials subject to ageing; service life frequently exceeds 25–30 years.
- Shock absorption: effectively dissipates high-energy impulsive loads — blasts, shock waves, impacts.
Limitations
- Greater design complexity: sizing requires more in-depth analysis than standard elastomers.
- Mainly used in specialised fields: the higher cost is economically justified primarily in high-value or harsh-environment applications.
Typical applications
- Shipbuilding and offshore (saline environments)
- Military and defence applications
- Aerospace and aviation
- Systems subject to dynamic shocks
- Protection of sensitive instrumentation in severe vibration environments
Direct technical comparison
The table below summarises the main performance differences between the three technologies.
| Parameter | Rubber / Elastomer | Helical Spring | Wire Rope Inox |
|---|---|---|---|
| Damping ratio (ζ) | High (0.1 – 0.5) | Low (< 0.05) | Medium (0.05 – 0.15) |
| Typical natural frequency | 8 – 25 Hz | 1 – 3 Hz | 5 – 50 Hz |
| Low-frequency isolation | Medium | Very high | High |
| Load capacity | Medium | High | Variable |
| Operating temperature range | –20 / +80 °C | –40 / +150 °C | –60 / +250 °C |
| Corrosion resistance | Limited | Medium | Very high |
| Shock resistance | Low | Medium | High |
| Typical service life | 5 – 10 years | 15 – 25 years | 25 – 30+ years |
| Relative cost | Low | Medium | Medium-high |
How to choose the right type of anti-vibration mount
The choice cannot be based on material alone — it must start from an analysis of actual operating conditions. The key parameters to evaluate are:
1. Machine excitation frequency
This is the most critical parameter. Motors at 3,000 rpm generate a primary excitation at 50 Hz — the ideal range for elastomers. Compressors at 300 rpm (5 Hz) require helical springs or wire rope isolators.
2. Total mass and number of support points
High mass distributed over few supports requires elements with high load capacity. Verify the load per support point and the expected static deflection.
3. Presence of shocks or impulsive loads
If the system is subject to impacts, blasts or impulsive accelerations, wire rope isolators are the most reliable choice. Helical springs are not suited to high shock loads.
4. Environmental conditions
Saline environments, extreme temperatures or aggressive chemical agents rule out standard elastomers and point towards stainless steel systems.
5. Required service life and maintenance costs
For inaccessible installations or critical environments where replacement is costly, the longer service life of metallic systems offsets the higher initial cost.
Frequently asked questions about anti-vibration mount types
Do you have a project to size?
The Vibrostop team is available to help you select and size the anti-vibration mount best suited to your application. Contact us for a technical consultation