https://actuallyrandom.com/tags/polystyrene/ Recent content in Polystyrene on Actually Random Hugo en-us Fri, 10 Jul 2026 19:00:00 +1200 https://actuallyrandom.com/posts/s-grade-vs-h-grade-polystyrene/ Fri, 10 Jul 2026 19:00:00 +1200 https://actuallyrandom.com/posts/s-grade-vs-h-grade-polystyrene/ S grade EPS is 16 kg/m3 and H grade is 24 kg/m3. Here are the densities, R-values, compressive strengths and the colour code that tells them apart, and why the manufacturer's numbers beat the standard's.