Convert Microinches per inch per degree Fahrenheit to ppm per degree Fahrenheit
Convert Microinches per inch per degree Fahrenheit (μin/(in·°F)) to ppm per degree Fahrenheit (ppm/°F) instantly and accurately.
Conversion Formula
ppm/°F = μin/(in·°F) × 1
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.
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.
Quick Reference Table
| Microinches per inch per degree Fahrenheit (μin/(in·°F)) | ppm per degree Fahrenheit (ppm/°F) |
|---|---|
| 1 μin/(in·°F) | 1 ppm/°F |
| 2 μin/(in·°F) | 2 ppm/°F |
| 5 μin/(in·°F) | 5 ppm/°F |
| 10 μin/(in·°F) | 10 ppm/°F |
| 25 μin/(in·°F) | 25 ppm/°F |
| 50 μin/(in·°F) | 50 ppm/°F |
| 100 μin/(in·°F) | 100 ppm/°F |