Kovar Alloy Physical Properties

(Also know as ASTM F-15, NILO K, Pernifer 2918, Rodar, and Dilvar P1)

Density lb/cu in 0.302
Specific Gravity   8.36
Curie Temp °F 815
  °C 435
Melting Point °F 2640
  °C 1449
Electrical Resistivity Micro-ohm-cm 40
  Micro-ohm-cm 294
Thermal Conductivity W/cm °C 0.17
  BTU-in/sq. ft-hr- 120
Specific Heat Cal/g- °C 0.11
  BTU/lbm- °F 0.11
Thermal Expansion ppm/°F (75°F to 842°F) 2.9
  ppm/°C (25°C to 450°F) 5.3

Kovar Alloy Mechanical Properties

Tensile Strength ksi 75
  MPa 518
Yield Strength ksi 40
  MPa 276
Elongation % in 2 in. 30
Typical Hardness Ann. Rockwell HRB 80
Modulus of Elasticity Mpsi 30
  kMPa 207

Kovar Alloy Chemistry

maximum % unless noted
Iron Bal
Nominal Nickel 29
Nominal Cobalt 17
Carbon 0.02
Silicon 0.20
Sulfur --
Chromium 0.20

Kovar Alloy Linear Coefficient of Thermal Expansion

Degree C   Degree C
30-100 -- 30-450 5.1 - 5.5
30-150 -- 30-475 --
30-200 5.5 30-500 6.2
30-250 -- 30-525 --
30-300 5.1 30-550 --
30-325 -- 30-600 7.9
30-350 -- 30-700 9.3
30-375 -- 30-800 10.4
30-400 4.6 - 5.2 30-900 11.5
30-425 -- 30-1000 --