Convert ppm per degree Fahrenheit to Microinches per inch per degree Fahrenheit
Convert ppm per degree Fahrenheit (ppm/°F) to Microinches per inch per degree Fahrenheit (μin/(in·°F)) instantly and accurately.
Conversion Formula
μin/(in·°F) = ppm/°F × 1
About ppm per degree Fahrenheit
The ppm/°F (= μin/(in·°F) exactly) equals 9/5 × 10⁻⁶ /K ≈1.8 × 10⁻⁶ /K and is the dominant CTE unit in US ASTM standards, ASME piping codes, and mechanical engineering handbooks. Steel ≈6.7 ppm/°F; aluminium ≈12.8 ppm/°F; copper ≈9.4 ppm/°F. 1 ppm/°F = 9/5 × 10⁻⁶ /K.
About Microinches per inch per degree Fahrenheit
The microinch per inch per degree Fahrenheit (μin/(in·°F)) equals exactly 9/5 × 10⁻⁶ /K = 1 ppm/°F. It is the native US CTE unit in ASTM E228 and ASTM E831 standards; most US material datasheets list CTE values in this unit. Steel: ≈6.7 μin/(in·°F); aluminium: ≈12.8 μin/(in·°F); titanium: ≈4.9 μin/(in·°F). 1 μin/(in·°F) = 1 ppm/°F.
Quick Reference Table
| ppm per degree Fahrenheit (ppm/°F) | Microinches per inch per degree Fahrenheit (μin/(in·°F)) |
|---|---|
| 1 ppm/°F | 1 μin/(in·°F) |
| 2 ppm/°F | 2 μin/(in·°F) |
| 5 ppm/°F | 5 μin/(in·°F) |
| 10 ppm/°F | 10 μin/(in·°F) |
| 25 ppm/°F | 25 μin/(in·°F) |
| 50 ppm/°F | 50 μin/(in·°F) |
| 100 ppm/°F | 100 μin/(in·°F) |