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.
Invar 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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