CeraTex® Ceramic Fiber R-value

In some applications of CeraTex^® products people may want to use ceramic fiber “R-value” to calculate what size is needed.

R-value is related to the following factors:

• Thermal conductivity (k) of the material,
• Thickness,
• Tightness of the material (how much it is compressed)
• Working Temperature

As so many variables affect the R-value, manufacturers normally only give customers thermal conductivity value (provided in data sheet) instead of R-value. If all the factors are known, R-value can be calculated from the thermal conductivity:

R=T/k

T: thickness in inches, k: thermal conductivity in BTU/sqft F/inch