Thermesthesiometer (Skin Sensation) Testing*

No topcoat / With topcoat Hot Plate Temperature Thermesthesiometer (TM/5s) (Ave. of 3 samples) Insulation Surface Temperature
°F °F °F
16 mm Thickness
No topcoat 500 107 175
600 111 211
700 113 242
With topcoat 600 111 190
8 mm Thickness
No topcoat 600 120 315
With topcoat 600 120 264
No topcoat / With topcoat Hot Plate Temperature Thermesthesiometer (TM/5s) (Ave. of 3 samples) Insulation Surface Temperature
°C °C °C
16 mm Thickness
No topcoat 250 42 79
315 44 99
371 54 117
With topcoat 315 44 88
8 mm Thickness
No topcoat 315 49 157
With topcoat 315 49 129

* Testing performed at Polylab, LLC in Houston, TX by Dr. Benjamin Chang

NOTES:
1) 60°C is the metallic surface temperature above which personnel protection (PP) is usually required in company standards for surfaces within a specified distance of routine personnel access to eliminate risk of burns due to accidental contact.

2) ASTM C1055, Standard Guide for Heated System Surface Conditions That Produce Contact Burn Injuries, has been used in industry to determine the above temperature threshold for personnel protection. Per Section 1.4, “for design purposes, the probable contact time for industrial situations has been established at 5 s.”

3) ASTM C1057, Standard Practice for Determination of Skin Contact Temperature from Heated Surfaces Using a Mathematical Model and Thermesthesiometer, is a companion document which is used to determine the burn hazard potential of a heated surface. It provides two alternative procedures for this determination: Method A is use of a mathematical model calculation, or Method B is use of a thermesthesiometer (a temperature probe with a plastic rubber probe having similar heat transfer characteristics to the human finger) to “measure” the contact temperature on real systems.

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