We have an "R" value established for HOT PIPE COATING ® at 0.9mm / 37 mils Dry Film Thickness which is R 15.87
15 May 06
Mr. Keith Kieres
GBRX Inc.
Subject Preliminary Thermal Conductivity Calculations for Hot Pipe Coating (HPC) Superior Products
Dear Keith,
In reference to the above product, testing was performed to identify thermal characteristics. These included:
1- Diffusivity
2- Conductivity
3- Specific heat
The test method for the thermal testing is the ASTM E1461 (DIN EN 821 or DIN 30905). The equipment is calibrated with a NIST SRM 8421, thermal conductivity reference. The average conductivity value in W/mK at room temperature is 0.1083 which converts to a k value of 0.75 at one inch (Btu-in/hr ft F). However, since this value is at one inch and the HPC had an actual thickness of 0.037 in. an adjustment is necessary. This would then adjust the HPC k value of 0.028 at the 0.037 in. thick, which would yield an R-value of 35. However, Superior through their conservatism and other testing (ASTM C 236) has decided to establish an R-value of 19.
The majority of insulation thermal properties either tested or calculated are based on “standard” insulation such as foam or fiberglass. Hence the mechanisms for measurements and their related calculations are primarily oriented for properties of conduction. Convection and radiation play a small part in the measurement or calculation. When an insulation material has a mechanism of operation different than that of standard insulations, current technology for measuring and calculating become problematic. The most effective method of demonstrating the insulation value is through actual test of the product or a simulation.
Do not hesitate to contact me if there are any other questions.
Very truly yours,
Neil Schultz
Executive Director
