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Thermal Effusivity of Multiple Layers and Force

Using the TPS-EFF Meter and optional Compression Stand (TPS-EFF-CS) , Thermal Effusivity measurements were made on a polyester cotton water repellent fabric and memory foam. Test time (touch times) of 2 and 10 seconds were made.

SAMPLE 1: Polyester Cotton Fabric
Compression Force: 1 lb
Test time (2 seconds): 260 W√s/m2K
Test time (10 seconds): 254 W√s/m2K (layered for sufficient thickness)

Thermal Effusivity of Polyester Cotton Fabric

Figure 1: Thermal Effusivity of Polyester Cotton Fabric

SAMPLE 2: Memory Foam
Compression Force: 1 lb
Test time (2 seconds): 73 W√s/m2K
Test time (10 seconds): 71 W√s/m2K

Thermal Effusivity of Memory Foam

Figure 2: Thermal Effusivity of Memory Foam

Thermal Effusivity of Polyester Cotton Fabric with memory foam

Figure 3. Thermal Effusivity of Polyester Cotton Fabric with memory foam

SAMPLE 1 & 2: Polyester Cotton Fabric was placed over the Memory Foam
Compression Force: 1 lb
Test time
(2 seconds):		 203 W√s/m2K
Test time
(10 seconds):		 165 W√s/m2K

When testing single type materials, test times (touch times) of 2 and 10 seconds measure (feel) very similar as the heat stays within that sample. When a more effusive layer is placed over a more insulative layer and measured, the feeling decays with test time (touch time) as heat from the sensor (your skin) is dominated by the lower effusivity layer.

Thermal Effusivity Test Times

Figure 4. Test times to simulate touch time

Learn More About Thermtest TPS-EFF

Thermal Effusivity Meter (TPS-EFF) is an advanced measurement meter for direct determination of thermal effusivity of textiles, fabrics, and solids, in accordance with ASTM D7984-16. TPS-EFF uses a single-sided TPS sensor along with 2 and 10 second test times to fully understand measurement of comfort with touch time.

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