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High Temperature Pre-Molded Perlite Fitting Covers
Heat Loss

We have run tests to check the heat loss of mitered vs. molded fittings. Our test was run on a hot plate where we measured the hot and cold surface of block insulation (both calcium silicate and perlite silicate). The block insulation was then cut into strips, glued back together, and then we reexamined the hot and cold surfaces. Our tests resulted in 15-20% more heat loss when mitered joints was used (copy of the test enclosed). Our competitor also ran a like test using regular pipe covering and mitered pipe covering with similar results.

Thermal Conductivity Test

Test Date: July 11, 1994

Goal: To determine if Sproule Pre-Molded High Temperature Perlite Fitting Covers are more thermally efficient than either mitered perlite fittings or mitered calcium silicate fittings.

Procedure:
  1. Take typical (i.e. Calcium Silicate) block and cut to 12"X 12" X 1 ½".
  2. Pre-dry molded sample at 175o F for 24 hours to remove any moisture.
  3. Place molded block onto hot plate, clamp down, and run at 400o F for 24 hours to stabilize.
  4. Measure cold surface temperature of molded fitting (block).
  5. Remove block, cut into twelve equal segments and glue back together.
  6. Dry mitered fitting at 175o F for 2 hours to dry adhesive.
  7. Place molded block onto hot plate, clamp down, and run at 400o F for 24 hours to stabilize.
  8. Measure cold surface temperature of mitered fitting (block).

Results
 

Hot Side

Cold Side

Calcium Silicate Molded Block

400° F

151° F

Calcium Silicate Mitered Block

400° F

159° F

Sproule Perlite Molded Block

400° F

153° F

Sproule Perlite Mitered Block

400° F

160° F

Conclusion: The testing showed that thermal efficiency improved markedly when molded block was used instead of mitered block.

 

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