Epoxies for Bonding Invar

Invar is an iron-nickel alloy (typically 64% iron and 36% nickel), which offers an extremely low coefficient of thermal expansion (CTE). For some grades of Invar, the CTE can be as low as 1 ppm/C. One of the key properties of Invar is superior dimensional stability under varying temperature conditions. Therefore, it is mainly used in precision instruments in various industries. Usages include:

  • Laser systems
  • Temperature regulators
  • Scientific instruments
  • Positioning devices
  • Metrology devices
  • High voltage transmission lines
  • Seismic creep gauges

Read our guide to learn more about proper surface preparation for bonding metals.

Consideration for Bonding Invar--Low Coefficient of Thermal Expansion

Main products for bonding invar include EP21TCHT-1 and EP30LTE-LO. Two component, thermally conductive, electrically insulative Master Bond EP21TCHT-1 is serviceable from 4K to 400F. This thixotropic paste is formulated to cure at ambient temperatures and meets NASA low outgassing requirements. Low viscosity EP30LTE-LO has superior dimensional stability. It exhibits excellent thermal conductivity, high bond strength, ultra low CTE and low outgassing properties.

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