Kovar® Alloy Physical Properties
(Also known as ASTM F15, NILO® K, Pernifer® 2918, Rodar®, and Dilver® 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 | mm2/m | 49 |
| ohm/cir. mi/ft | 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 | 5.8 | 30-450 | 5.1 - 5.5 |
| 30-150 | 5.6 | 30-475 | -- |
| 30-200 | 5.4 | 30-500 | 6.1 |
| 30-250 | 5.3 | 30-525 | -- |
| 30-300 | 5.1 | 30-550 | 6.8 |
| 30-325 | -- | 30-600 | 7.5 |
| 30-350 | 4.9 | 30-700 | 8.7 |
| 30-375 | -- | 30-800 | 10.3 |
| 30-400 | 4.6 - 5.2 | 30-900 | 10.8 |
| 30-425 | -- | 30-1000 | 11.7 |
| Underscored face values are the limits specified in MIL-l-23011C | |||