graphite EPS · 10mm
R 0.32
U 2.03 W/m²·K
graphite EPS, 10 mm — R 0.32
10 mm divided by a conductivity of 0.031 gives an R-value of 0.32. The U-value is 2.03, so a square metre leaks 40.6 W across a 20-degree difference.
Standards it meets
Not up to any of them yet
- Material
- graphite EPS
- Thickness
- 10 mm
- Thermal conductivity
- 0.031 W/m·K
- Thermal resistance
- 0.32 m²·K/W
- U-value
- 2.03 W/m²·K
- Heat lost per square metre
- 40.6 W
- As concrete
- 0.52 m
Thickness for the same performance
This is the number that shows what insulation is worth. Matching 100 mm of XPS with concrete alone would take 5.7 metres of it. No one builds a wall like that — which is why a concrete building only gets warm once a thin layer of insulation is added.
- vacuum panel2 mm
- phenolic foam6 mm
- rigid polyurethane7 mm
- extruded polystyrene9 mm
- white EPS12 mm
- glass wool12 mm
- mineral wool13 mm
- cellulose14 mm
- timber42 mm
- plasterboard58 mm
- concrete516 mm
Nearby cells
Same material, other thicknesses
Same thickness, other materials
How to read this
- Thermal resistance is the thickness in metres divided by the conductivity. Bigger is better.
- The U-value adds 0.17 of surface resistance and then flips the total. Smaller is better.
- Resistances add across layers, so a whole wall is the sum of its parts.
- Conductivity varies by product; the values here are typical for the material.
Frequently asked questions
Q. What is the R-value of 10 mm of graphite EPS?
0.32 — 10 mm in metres divided by a conductivity of 0.031.
Q. And the U-value?
2.03. That is 0.49 — the resistance plus 0.17 of surface — turned upside down, and a square metre leaks 40.6 W across 20 degrees.
Q. How much concrete would match it?
0.52 metres.
Q. Which standards does it meet?
At 2.03 it does not clear any of them yet.