SilGrip™ NVH

Noise, Vibration, and Harshness

Vibrations generated during the operation of an engine can travel through structural components of a vehicle into the cabin and manifest as noise, vibration, and harshness (NVH) that is a nuisance to the operator.  Reduction of NVH is a critical aspect of improving a drivers assessment of vehicle quality.  This is especially true for luxury vehicles where consumer expectations are at an all time high.

NVH Reduction Techniques

One of the main techniques currently used in automotive manufacturing to reduce noise and vibration is the application of a viscoelastic material to metal or composite components that are susceptible to vibration in order to "dampen" noise and vibration.  There are many materials that are currently used for NVH damping including many acrylic and rubber based adhesives.  While these types of adhesive provide sufficient damping at room temperature, the damping properties provided are significantly reduced with relatively small changes in temperature and are almost non-existant at temperatures outside of 15-25°C. 

Optimizing NVH with SilGrip™

SilGrip™ NVH is a fully customizable contact adhesive system that is designed to provide optimum noise and vibration damping across a much wider temperature range (-54°C  - 380°C) than traditional viscoelastic damping materials. SilGrip™ NVH also has much wider peaks compared to other adhesives, which could allow for part number consolidation or a better overall product around room temperatures. This provides formulators with an easier to use, more universal solution to NVH damping.
The SilGrip™ NVH system consists of a silicone pressure sensitive adhesive (SilGrip™ NVH-PSA1), a high temperature modifier (SilGrip™ NVH-HT1), and a low temperature modifier (SilGrip™ NVH-LT1).  By mixing SilGrip™ NVH-PSA1 with either SilGrip™ NVH-HT1 of SilGrip™ NVH-LT1, damping properties for a specific temperature range can optimized.  The mix ratios and chart below provide you a starting point for maximizing damping properties at a specified temperature range with SilGrip™ NVH.

PSA1 Formulation Calculator

To calculate an exact mix ratio for SIlGrip™ PSA1 enter the temperature at which you wish dampening properties to be maximized and your target solution mass into the calculator below.

The use of SilGrip™ SRC18 or BPO at 1-3% is recommended as a catalyst for cross-linking and curing SilGrip™ NVH adhesives.  In general, peak damping is reduced by excessive catalyst.  Therefore, the minimum amount of catalyst necessary to achieve good cure should be used to maximize damping performance.

Preparation and Application of SilGrip™ NVH

The video below provides an overview on best practices for preparing and applying SilGrip™ NVH as a contact adhesive.

Summary and Conclusion

The SilGrip™ NVH contact adhesive system provides noise, vibration, and harshness damping over a wide temperature range.  In addition, SilGrip™ NVH contact adhesives provide a number of properties that are useful in automotive applications including:
  • UV resistance
  • Resistance to solvents
  • Moisture and weathering resistance
  • Formulation latitude

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