What does Expanded Polystyrene (EPS) typically look like?

Expanded Polystyrene (EPS) is recognized for its distinctive appearance, which is primarily characterized by white beads that are fused together. This lightweight, rigid foam material is created through the expansion of polystyrene foam beads, and it is commonly used for insulation and packaging because of its excellent thermal properties and versatility.

The white beads of EPS are small, and their structure gives the material significant insulating capabilities while remaining easy to handle and install. This specific visual characteristic is what differentiates EPS from other types of insulation materials, such as the brown, dense foam that may represent other types of insulation like polyurethane. The smooth gray boards may refer to extruded polystyrene (XPS), which has a different manufacturing process and appearance compared to EPS. Transparent sheets are not representative of EPS at all; rather, those would resemble other types of materials entirely, like films or plastics.

Understanding the definitive look of EPS is essential for proper identification and application in building or insulation projects.