Raw expanded polystyrene sheets M Grade Density Raw expanded polystyrene is available in standard sizes and thicknesses as sheets. Standard thicknesses of M grade polystyrene sheets available are: 10mm x 2500 x 1200 20mm x 2500 x 1200 25mm x 2500 x 1200 35mm x 2500 x 1200 40mm x … Continue reading Polystyrene Sheets