Plastic generally has slower heat dissipation compared to glass. This is due to several factors related to the thermal conductivity and physical properties of both materials.

Thermal conductivity is a measure of a material's ability to conduct heat. Glass has a higher thermal conductivity than most plastics, typically ranging from 1 to 1.5 W/m·K, whereas plastics generally have a thermal conductivity of around 0.2 to 0.5 W/m·K. This means that glass can transfer heat more efficiently than plastic.

Additionally, the physical structure of glass allows for better heat transfer. Glass is a non-porous material, which means it has fewer pathways for heat to be trapped or absorbed. In contrast, plastics often have a more complex molecular structure with more opportunities for heat to be absorbed and retained.

Data from a study published in the Journal of Materials Science and Engineering A supports this. The study found that the thermal conductivity of glass is approximately 1.5 times higher than that of polystyrene, a common plastic. This indicates that glass dissipates heat more effectively than polystyrene.

Furthermore, the thermal expansion coefficient of glass is lower than that of most plastics. This means that glass expands less when heated, which can help to maintain its structural integrity and prevent heat from being trapped within the material.

In summary, plastic generally has slower heat dissipation compared to glass due to its lower thermal conductivity, more complex molecular structure, and higher thermal expansion coefficient. These factors contribute to the slower transfer of heat through plastic, making it a less efficient material for heat dissipation applications.