Convert Microinches per inch per degree Fahrenheit to Percent per kelvin
Convert Microinches per inch per degree Fahrenheit (μin/(in·°F)) to Percent per kelvin (%/K) instantly and accurately.
Conversion Formula
%/K = μin/(in·°F) × 0.00018
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 Percent per kelvin
The %/K equals exactly 10⁻² /K = 10 000 ppm/K and is used for high-CTE materials such as polymers, foams, and rubber. PTFE: ≈0.0135 %/K; HDPE: ≈0.015 %/K; natural rubber: ≈0.06 %/K; silicone rubber: ≈0.10 %/K. 1 %/K = 10⁻² /K = 10 mm/(m·K) = 10 000 ppm/K.
Quick Reference Table
| Microinches per inch per degree Fahrenheit (μin/(in·°F)) | Percent per kelvin (%/K) |
|---|---|
| 1 μin/(in·°F) | 0.00018 %/K |
| 2 μin/(in·°F) | 0.00036 %/K |
| 5 μin/(in·°F) | 0.0009 %/K |
| 10 μin/(in·°F) | 0.0018 %/K |
| 25 μin/(in·°F) | 0.0045 %/K |
| 50 μin/(in·°F) | 0.009 %/K |
| 100 μin/(in·°F) | 0.018 %/K |