Frequently Asked Quentions
Elastomers for Noise and Vibration Control, Shock Protection and Ergonomics (manufactured by EAR) /  Molding Materials

• What is the maximum load?
• The load under which natural frequency may be held down in structurally stable condition. In actual applications, however, it should be used at the load not greater than quarter to half the maximum load.

• What is the frequency
• Although elastic body having no viscosity exhibits the vibration isolation effect against frequencies higher than root 2 times the natural frequency, ISODAMP materials offers the vibration control effect even in the amplification range of vibration.

• What is the difference among ISODAMP C-1002, C-1105 and C-1100?
• C-1002, C-1105 and C-1100 are so formulated that their elasticity/viscosity may be maximized in three different temperature ranges i.e. 13~40°C, 27~55°C and 35~63°C respectively where they function in the same manner.

• Why is the grommet compressed by 5% when it is mounted?
• The grommet is deformed by the weight of equipment to which it is mounted. It is therefore recommended to apply a preload equivalent to such deformation.

• Some grommets have ribs. Why?
• Load is in proportion to cross sectional area, while height relates to natural frequency as thickness. Increasing thickness with cross sectional area reduced allows soft use to isolate vibration, while grommets with no rib may absorb vibration effectively.

• How to work out countermeasures against vibration
• Viscoelastic materials generally show the characteristics, i.e. their hardness and viscosity become higher at low temperature, while they become softer with the viscosity lowered at increased temperature.
  Vibration may be classified into harmful vibration (noise) and harmless vibration (white vibration).
  As no problems may occur to the equipment if the vibration is of harmless, it would be the effective countermeasures to treat any harmful vibration into white vibration.
  For shock, it would be the countermeasures to reduce the shock (G-value) against the input harmful to the equipment.

• Others
• UL File No.: E90847