XPS 300
EN 13164 XPS300
XPS 300 is an extruded closed-cell polystyrene board to EN 13164 rated at 300 kPa compressive strength, with nominal density 0.035 g/cm³ (35 kg/m³) and thermal conductivity 0.034 W/m·K.
Reference datasheet — XPS 300 is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the STD-CO2 condition
XPS 300 grades and fills
XPS 300 is supplied in 6 conditions, soft to hard. STD-CO2 is the default FabDigit quotes; the values on this page are for it.
Compare all 6 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Grooved/channelled perimeter drainage board | Use against basement walls where the board must also drain water and protect the waterproofing membrane. | 0.28 | 0.4 | 3 | |
High recycled-PS content board | Choose for EPD/green-building credits; uses post-industrial and post-consumer PS regrind in the core. | 0.29 | 0.4 | 2.5 | |
STD-CO2Default STD-CO₂ | Default HFC-free board for below-grade walls, floors and inverted roofs where λ 0.033–0.036 is sufficient. | 0.3 | 0.45 | 3 | |
HFO/low-GWP blowing agent, low-lambda board | Pick when U-value targets need λ ≈ 0.028–0.030 in limited thickness, e.g. thin perimeter or inverted-roof build-ups. | 0.3 | 0.45 | 3 | |
Graphite / IR-absorber enhanced grey board | Use where a slightly lower lambda is wanted with conventional CO₂ blowing; grey-coloured core from IR absorber. | 0.3 | 0.44 | 2.8 | |
Polymeric (HBCD-free) flame retardant, Euroclass E | Current EU-compliant FR chemistry (brominated styrene-butadiene polymer) replacing HBCD; required for REACH/POP compliance. | 0.3 | 0.43 | 2.8 |
Supply forms, finishes and certifications
Ways XPS 300 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
PLANED | Skin removed / planed both faces for rendering | Coating |
TG | Shiplap / tongue-and-groove edge profile | Coating |
What is XPS 300?
XPS 300 is an extruded closed-cell polystyrene board to EN 13164 rated at 300 kPa compressive strength, with nominal density 0.035 g/cm³ (35 kg/m³) and thermal conductivity 0.034 W/m·K. Its extruded skin and closed-cell structure give low water uptake, which makes it the standard choice for below-grade and inverted roof insulation; stock includes CO2- and HFO-blown, graphite-loaded, planed, tongue-and-groove, drainage-profiled, flame-retardant and recycled-content variants. It is not UV or solvent stable and can only be shaped subtractively, since extrusion fixes the board thickness. Step up to XPS 400 for higher traffic loads, or use EPS 150/200 where cost and thicker sections matter more than moisture resistance. XPS 300 has a density of 0.04 g/cm³ (0.0013 lb/in³), lighter than 92% of polymer grades. Its glass-transition temperature is 100°C (212 °F). XPS 300 has a yield strength of 0.3 MPa (0.0435 ksi) and a tensile strength of 0.45 MPa (0.0653 ksi) — weaker than 97% of polymer grades. Elongation at break is 3% and the elastic modulus is 0.02 GPa (0.0022 Msi).
What is XPS 300 used for?
- Below-grade (perimeter) wall insulation
- Inverted roof insulation
- Under-slab and foundation insulation
- Frost protection for foundations and pavements
- Insulated render substrates on planed board
- Cold store wall and floor panels
- Drainage-profiled basement boards
Advantages
- Easy to machine — 92/100, better than 99% of polymer grades
- Lightweight — 0.04 g/cm³ (0.0013 lb/in³), better than 92% of polymer grades
- Low embodied carbon — 3.2 kg CO₂/kg, better than 81% of polymer grades
Limitations
- Low strength — 0.3 MPa (0.0435 ksi), worse than 97% of polymer grades
- Degrades in UV without stabilisers — 15/100, worse than 95% of polymer grades
- Poor heat conductor — 0.03 W/m·K (0.0196 BTU/hr·ft·°F), worse than 94% of polymer grades
- Limited formability — 10/100, worse than 87% of polymer grades
- Limited ductility — 3%, worse than 83% of polymer grades
XPS 300 properties
Typical room-temperature values for XPS 300-STD-CO2; bars are the position among polymer grades.
Physical4
XPS 300 has a density of 0.04 g/cm³ (0.0013 lb/in³), lighter than 92% of polymer grades. Its glass-transition temperature is 100°C (212 °F).
Mechanical10
XPS 300 has a yield strength of 0.3 MPa (0.0435 ksi) and a tensile strength of 0.45 MPa (0.0653 ksi) — weaker than 97% of polymer grades. Elongation at break is 3% and the elastic modulus is 0.02 GPa (0.0022 Msi).
Thermal9
XPS 300 is rated for continuous service to 75°C (167 °F). It conducts heat at 0.03 W/m·K (0.0196 BTU/hr·ft·°F), worse than 94% of polymer grades. Thermal expansion is 70 µm/m·K (38.9 µin/in·°F).
Electrical3
XPS 300 has an electrical resistivity of 1×10¹⁴ Ω·m.
Chemical & Environmental3
Corrosion resistance is excellent (85/100), better than 65% of polymer grades. UV resistance is poor.
Sustainability4
Producing a kilogram of XPS 300 takes about 100 MJ of energy and emits 3.2 kg of CO₂ — less than 61% of polymer grades. Typical recycled content is 15%.
Manufacturability4
XPS 300's machinability is excellent (92/100, better than 99% of polymer grades); weldability poor (15/100); formability not recommended (10/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the polymer family
Yield strength against density for every polymer grade FabDigit runs. XPS 300 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with XPS 300
Is XPS 300 easy to machine?
Cuts cleanly with a utility knife, hot-wire, fine-tooth handsaw or CNC router; use dust extraction and avoid melting/smearing from high-speed tooling.
Can XPS 300 be welded?
Not weldable in a structural sense; boards are joined mechanically (shiplap/T&G) or with solvent-free PU or cement-based adhesives.
Can XPS 300 be formed, bent or molded?
Produced by continuous tandem extrusion foaming and cut to size — no post-forming; can be thermally curved only slightly, so profiles are machined not bent.
XPS 300 chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| blowing agent (CO₂ / HFO-1234ze / co-bloresidual after extrusion foaming | 1 – 5 | 3 |
| brominated polymeric flame retardantHBCD-free polymeric FR in current EU production | 0.5 – 2 | 1 |
| talc (nucleating agent) | 0.2 – 1 | 0.5 |
| pigment / IR absorber (graphite in grey | 0 – 1.5 | 0.3 |
| polystyrene (PS homopolymer, incl. regrimatrix resin | ≥ 90 (balance) |
What surface finishes work on XPS 300?
Must be protected from UV and solvents: cover with render on planed/embossed faces, cement board, backfill or ballast; use only solvent-free bitumen and adhesives.
Equivalent designations
Standards and trade names that resolve to XPS 300 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 13164 XPS300
- Other
- GB/T 10801.2 XPS300
How much does XPS 300 cost?
XPS 300 is a standard-cost polymer ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
XPS 300 — frequently asked
What is XPS 300 used for?
XPS 300 is typically used for below-grade (perimeter) wall insulation, inverted roof insulation, under-slab and foundation insulation, frost protection for foundations and pavements, insulated render substrates on planed board and cold store wall and floor panels. In short: standard below-grade XPS; low water absorption board; 300 kPa compressive class.
What is the yield strength of XPS 300?
XPS 300 has a typical yield strength of 0.3 MPa (0.0435 ksi) and a tensile strength of 0.45 MPa (0.0653 ksi) — weaker than 97% of polymer grades. Strength varies by condition: see the 6 listed tempers.
Is XPS 300 easy to machine?
Yes — machinability is rated excellent (92/100, better than 99% of polymer grades). Cuts cleanly with a utility knife, hot-wire, fine-tooth handsaw or CNC router; use dust extraction and avoid melting/smearing from high-speed tooling.
Can XPS 300 be welded?
Not readily — weldability is rated poor (15/100). Not weldable in a structural sense; boards are joined mechanically (shiplap/T&G) or with solvent-free PU or cement-based adhesives.
What surface finishes work on XPS 300?
Must be protected from UV and solvents: cover with render on planed/embossed faces, cement board, backfill or ballast; use only solvent-free bitumen and adhesives.
Can XPS 300 be formed, bent or molded?
Produced by continuous tandem extrusion foaming and cut to size — no post-forming; can be thermally curved only slightly, so profiles are machined not bent.
What is the maximum service temperature of XPS 300?
XPS 300 is rated for continuous use to about 75°C (167 °F), and briefly to 85°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between XPS 300 STD-CO2 and XPS 300 DRAIN?
STD-CO2 is the default condition — default HFC-free board for below-grade walls, floors and inverted roofs where λ 0.033–0.036 is sufficient. DRAIN: use against basement walls where the board must also drain water and protect the waterproofing membrane. Yield strength is 0.3 MPa in STD-CO2 versus 0.28 MPa in DRAIN.
How much does XPS 300 cost?
XPS 300 is a standard-cost polymer ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Sources
- EN 13164:2012+A1:2015 — Thermal insulation products for buildings: factory made extruded polystyrene foam (XPS) — CEN (2015)
- EN 826 / EN 12087 / EN 12089 / EN 12667 test methods for rigid insulation — CEN (2013)
- ASTM C578 — Rigid Cellular Polystyrene Thermal Insulation — ASTM (2022)
- XPS board technical datasheets / CE-DoP (Austrotherm, URSA, Ravago, Soprema, Styrofoam) — various (2024)
- Inventory of Carbon & Energy (ICE) and European XPS EPDs — Circular Ecology / EXIBA (2023)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.