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Ravatherm XPS X 300 SL is a flame retarded extruded polystyrene with exceptional lambda insulation performance and a Global Warming Potential (GWP) of less than five. It has attained a coveted Green Guide Rating A+ by BREEAM, and continues to enable the construction of energy efficient buildings.

Ravatherm XPS X 300 SL is a high-performance, multi-purpose polystyrene for the thermal insulation and frost protection of inverted flat roofs, green and blue roofs.

It is manufactured by an extrusion process which results in homogeneous, closed-cell material structure and smooth surface skin (extrusion skin) which has many favourable material characteristics.

Standard product features

Board size:

1250 x 600 mm.

Compressive strength:

300 kPa.

Edge profile:


Compressive creep (design load) maximum 2% deflection after 50 years:

130 kPa.

Fire classification:

Euroclass E.

Thermal conductivity:

  • 50mm: 0.030 W/m·K.
  • 80–205 mm: 0.031 W/m·K

Operating temperature range:

-50°C to +75°C.

Foaming agent:

  • Hydrochlorofluorocarbon (HCFC) free.
  • Blown with CO2 for a Global Warming Potential (GWP) of less than five.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-45-65/410 Extruded polystyrene (XPS) board

Product specification

An important note about specifying



Ravago Building Solutions


+44 (330) 060 6015

Product reference

Ravatherm XPS X 300 SL


[50 mm]
[80 mm]
[100 mm]
[120 mm]
[140 mm]
[160 mm]
[180 mm]
[200 mm]
[205 mm]

Manufacturer details

Ravago Building Solutions,
Estuary Road,
Kings Lynn, PE30 2HJ
Tel +44 (330) 060 6015
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