ASTM C578 is a critical standard that specifies the physical properties and dimensions of rigid, cellular polystyrene thermal insulation, including EPS foam. This standard ensures that EPS foam products meet specific criteria for thermal performance, durability, and safety, making them suitable for a wide range of applications.

Key Points
• Thermal Resistance: EPS foam must provide reliable thermal resistance, maintaining its R-value over time.
• Compressive Strength: EPS foam should withstand significant loads without losing structural integrity.
• Moisture Resistance: EPS boards should have low water absorption to prevent degradation and maintain insulation properties.
• Dimensional Stability: EPS foam must maintain its shape and size under various environmental conditions.
• Safety Standards: EPS foam must comply with stringent fire safety standards to ensure it is safe for use in construction.