You're likely referring to "Styrofoam", which is a brand name for expanded polystyrene (EPS). The density of Styrofoam can vary greatly depending on its type and manufacturing process.

However, a typical range for density is 15-35 kg/m³.

Here's a breakdown:

* Low-density Styrofoam (around 15-20 kg/m³) is used for packaging and insulation due to its lightweight and cushioning properties.

* Medium-density Styrofoam (around 25-30 kg/m³) is used for items like cups and plates because it offers a bit more rigidity.

* High-density Styrofoam (above 30 kg/m³) is used for specialized applications where strength is required, like construction insulation boards.

It's important to note that "Thermocol" is a brand name used in some regions, and it may refer to different materials like expanded polypropylene or polyurethane. If you have a specific brand or type of "Thermocol" in mind, providing more information will help determine its accurate density.