What are the differences in thermal conductivity between PVC and polypropylene?

Thermal conductivity is a critical property when selecting materials for applications involving heat transfer. PVC (Polyvinyl Chloride) and polypropylene are two widely used plastics with distinct thermal properties.

PVC has a thermal conductivity of approximately 0.14–0.28 W/m·K, making it a relatively poor conductor of heat. This low thermal conductivity makes PVC suitable for insulation applications, such as electrical cables and piping systems where heat retention or resistance is desired.

In contrast, polypropylene exhibits a slightly higher thermal conductivity, ranging from 0.1–0.22 W/m·K. While still a poor conductor compared to metals, polypropylene's marginally better heat transfer capability makes it useful in applications like food containers or automotive parts where moderate thermal stability is needed.

The differences arise from their molecular structures. PVC's chlorine content contributes to its lower thermal conductivity, while polypropylene's simpler hydrocarbon structure allows for slightly better heat transfer.

When choosing between these materials, consider the specific thermal requirements of your application. PVC is ideal for insulation, while polypropylene offers a balance of thermal and mechanical properties for diverse uses.