Convert Microinches per inch per degree Fahrenheit to Microns per metre per degree Celsius
Convert Microinches per inch per degree Fahrenheit (μin/(in·°F)) to Microns per metre per degree Celsius (μm/(m·°C)) instantly and accurately.
Conversion Formula
μm/(m·°C) = μin/(in·°F) × 1.8
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 Microns per metre per degree Celsius
The micrometre per metre per degree Celsius (μm/(m·°C)) equals exactly 10⁻⁶ /K, since temperature intervals 1 °C = 1 K (exact). It is the standard CTE notation in European engineering datasheets, ISO material standards, and many textbooks. Numerically identical to ppm/K. Aluminium: 23.1 μm/(m·°C); steel: ≈12 μm/(m·°C). 1 μm/(m·°C) = 1 ppm/K = 10⁻⁶ /K.
Quick Reference Table
| Microinches per inch per degree Fahrenheit (μin/(in·°F)) | Microns per metre per degree Celsius (μm/(m·°C)) |
|---|---|
| 1 μin/(in·°F) | 1.8 μm/(m·°C) |
| 2 μin/(in·°F) | 3.6 μm/(m·°C) |
| 5 μin/(in·°F) | 9 μm/(m·°C) |
| 10 μin/(in·°F) | 18 μm/(m·°C) |
| 25 μin/(in·°F) | 45 μm/(m·°C) |
| 50 μin/(in·°F) | 90 μm/(m·°C) |
| 100 μin/(in·°F) | 180 μm/(m·°C) |