URGENT NOTICE:
A 25% price increase will be effective 28 March 2026 due to rising oil prices in the Middle East.
Polystyrene Sheet Densities Explained
Polystyrene Densities Overview
Understanding polystyrene sheet densities is key to choosing the right product for your project.
Density refers to how compact the foam is, measured in kilograms per cubic metre (kg/m³).
Higher density means stronger, more durable sheets with enhanced insulation properties.
South Africa’s construction industry uses a range of densities to meet diverse needs—from lightweight decorative finishes to heavy-duty floor insulation.
Selecting the correct density ensures optimal performance, durability, and cost-effectiveness tailored to your application.
Need help? Contact our technical department today.
What is Polystyrene Density?
Density describes how tightly packed the polystyrene beads or foam cells are in a sheet.
Low-density sheets are lighter and easier to handle, ideal for crafts and non-structural insulation.
Medium density provides excellent thermal resistance for walls and ceilings.
High-density sheets offer superior strength and compression resistance, perfect for structural uses like void formers and load-bearing insulation in concrete slabs.
Knowing density helps you get the right balance of strength and insulation for your project.
Typical Polystyrene Density Ranges
Polystyrene sheets come in a variety of densities:
Low density (~12–14 kg/m³): lightweight and ideal for decorative or craft use.
Medium density (15 kg/m³): excellent for general insulation in walls and ceilings.
High density (20 kg/m³): strong and durable, great for floors and structural applications.
Extra High density (24 -30 kg/m³): extremely strong and durable.
This range ensures there’s a polystyrene solution for every insulation or construction need in South Africa.
Why Density Matters
Density impacts insulation efficiency, strength, weight, and cost.
Higher density sheets provide better thermal resistance (R-value) and withstand heavier loads, making them ideal for floors and heavy-duty insulation.
Lower density sheets are lighter and more cost-effective for less demanding uses.
Understanding these benefits lets you select the perfect polystyrene sheet density for a sustainable, energy-efficient, and durable build.