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Plastic Molding Tutorial

#136 Thermal Conductivity of Materials

Category : Technical Information
January11, 2013

In molds or plastic materials, the physical phenomenon of processing or deforming is done by putting in or taking out heat by heating or cooling. The property of conveying heat is determined by the structure of the material. Thermal conductivity is one of the properties as being easy to convey (or hard to convey) heat through the material. Thermal conductivity is an index which expresses how much quantity of heat is conveyed within a unit time, over a unit length, and with a unit temperature change. The most commonly used symbol for this is λ (lambda). The unit is kcal/m• h• °C.

Material nameThermal conductivity λ (kcal/m• h• °C)
Aluminum175
Duralumin141
Iron58
Cast iron41
Carbon steel31-46
Nickel steel12-62
Invar9.2
Chrome steel27-62
Copper332
Bronze22
Brass52
Magnesium147
Lead30
Zinc96
Tin55
Gold267
Silver360
Platinum60
Cotton0.051
Glass0.65
Mica0.7-1.2
Concrete0.7-1.2

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