EPS 80
EN 13163 EPS80
EPS 80 is a steam-moulded expanded polystyrene bead foam classified to EN 13163 at 80 kPa compressive strength, with nominal density 0.019 g/cm³ (19 kg/m³), thermal conductivity 0.036 W/m·K and tensile strength 0.22 MPa.
Reference datasheet — EPS 80 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.
EPS 80 grades and fills
EPS 80 is supplied in 5 conditions, soft to hard.
Compare all 5 grades and fillsHide
| Grade · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness |
|---|---|---|---|---|---|
Aged, cut facade board with TR100 perpendicular tensile | Pick for adhesive-bonded facade insulation: 42-day ageing followed by two-sided cutting gives dimensional stability and perpendicular tensile strength ≥100 kPa. | 0.13 | 1.8 | ||
EPS 80 with recycled (rEPS) content | Choose to cut embodied carbon by adding 10–30% recycled EPS regrind, accepting conductivity that rises slightly to 0.038 W/m·K. | 0.18 | 1.6 | ||
Graphite-enhanced grey EPS 80 | Pick when insulation thickness is limited: graphite reflects infrared and lowers conductivity by about 15–20% to 0.032 W/m·K at comparable strength. | 0.2 | 2 | ||
High flame-retardant EPS 80, GB 8624 B1 grade | Choose when GB 8624 B1 fire class is mandated for high-rise external insulation; oxygen index is ≥30, with conductivity slightly higher at 0.037 W/m·K. | 0.21 | 1.8 | ||
Non-flame-retarded EPS 80 | Use only for packaging, void fill and buried positions with no fire requirement, since no flame retardant is added; conductivity is 0.036 W/m·K. | 0.22 | 2 |
Supply forms, finishes and certifications
Ways EPS 80 is supplied — form, process route, surface or paperwork — without a datasheet of their own. The property values above apply.
| Option | What it is | Type |
|---|---|---|
STDDefault | White standard EPS 80 board, Euroclass E | Standard supply |
What is EPS 80?
EPS 80 is a steam-moulded expanded polystyrene bead foam classified to EN 13163 at 80 kPa compressive strength, with nominal density 0.019 g/cm³ (19 kg/m³), thermal conductivity 0.036 W/m·K and tensile strength 0.22 MPa. Engineers specify it for external wall insulation (EWI/ETICS) where loads are low and thermal resistance per unit cost governs; it is supplied as block-cut boards, shape-moulded parts, graphite-loaded grey stock and flame-retardant or non-FR versions. Limits are the 78 °C maximum service temperature, low tensile strength, and zero UV or solvent resistance, so a render or facing is mandatory. Step up to EPS 100 or EPS 150 where compressive load increases. EPS 80 has a density of 0.02 g/cm³ (6.86×10⁻⁴ lb/in³), lighter than 99% of polymer grades. Its glass-transition temperature is 100°C (212 °F). EPS 80 has a tensile strength of 0.22 MPa (0.0319 ksi), weaker than 96% of polymer grades. Elongation at break is 2% and the elastic modulus is 0 GPa (6.53×10⁻⁴ Msi).
What is EPS 80 used for?
- External wall insulation
- Roof insulation
- Floor insulation
Advantages
- Lightweight — 0.02 g/cm³ (6.86×10⁻⁴ lb/in³), better than 99% of polymer grades
- Easy to machine — 90/100, better than 95% of polymer grades
- Low embodied carbon — 3.3 kg CO₂/kg, better than 78% of polymer grades
Limitations
- Degrades in UV without stabilisers — 12/100, worse than 99% of polymer grades
- Hard to polish — 5/100, worse than 99% of polymer grades
- Limited ductility — 2%, worse than 95% of polymer grades
- Poor heat conductor — 0.04 W/m·K (0.0208 BTU/hr·ft·°F), worse than 92% of polymer grades
- Low stiffness — 0 GPa (6.53×10⁻⁴ Msi), worse than 90% of polymer grades
EPS 80 properties
Typical room-temperature values; bars are the position among polymer grades.
Physical4
EPS 80 has a density of 0.02 g/cm³ (6.86×10⁻⁴ lb/in³), lighter than 99% of polymer grades. Its glass-transition temperature is 100°C (212 °F).
Mechanical9
EPS 80 has a tensile strength of 0.22 MPa (0.0319 ksi), weaker than 96% of polymer grades. Elongation at break is 2% and the elastic modulus is 0 GPa (6.53×10⁻⁴ Msi).
Thermal8
EPS 80 is rated for continuous service to 78°C (172 °F). It conducts heat at 0.04 W/m·K (0.0208 BTU/hr·ft·°F), worse than 92% of polymer grades. Thermal expansion is 65 µm/m·K (36.1 µin/in·°F).
Electrical3
Chemical & Environmental3
Corrosion resistance is very good (80/100), worse than 52% of polymer grades. UV resistance is not recommended.
Sustainability4
Producing a kilogram of EPS 80 takes about 100 MJ of energy and emits 3.3 kg of CO₂ — less than 61% of polymer grades. Typical recycled content is 5%.
Manufacturability5
EPS 80's machinability is excellent (90/100, better than 95% of polymer grades); weldability poor (25/100); formability poor (30/100).
Common Calculations4
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. EPS 80 is highlighted; hover a dot for its name, or open the interactive family chart.
Working with EPS 80
Is EPS 80 easy to machine?
Hot-wire cutting, band sawing and high-speed milling all work; if the hot wire travels too slowly the foam melts and slumps. Cut beads carry a strong static charge, so run vacuum extraction.
Can EPS 80 be welded?
Not fusion weldable. Blocks are secondary-fused with steam in the mould; on site, joints are made with solvent-free polyurethane foam adhesive or water-based adhesive mortar.
Can EPS 80 be formed, bent or molded?
Steam-moulded from pre-expanded beads into blocks or shaped parts. After demoulding, age 3–6 weeks to stabilise dimensions before cutting to board.
EPS 80 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 |
|---|---|---|
| pentane (residual blowing agent)residual pentane after ageing | 0.1 – 1.5 | 0.6 |
| polymeric brominated flame retardant (Poflame-retarded grades; replaces HBCD | 0.3 – 1.2 | 0.7 |
| graphiteonly in grey graphite type (GEPS) | 0 – 4 | 0 |
| processing additives (nucleant, antistat | 0.1 – 0.6 | 0.3 |
| polystyrene (styrene homopolymer)closed-cell wall material after foaming; air about 98% by volume | ≥ 94 (balance) |
What surface finishes work on EPS 80?
The surface must be protected with a base-coat render plus reinforcing mesh, cement board or a metal facing. Use water-based coatings only — solvent-based paints and bitumen attack the surface.
Equivalent designations
Standards and trade names that resolve to EPS 80 in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- EN / DIN / Werkstoff-Nr.
- 13163 EPS80
How much does EPS 80 cost?
EPS 80 is a standard-cost polymer ($$), cheaper than about 71% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
EPS 80 — frequently asked
What is EPS 80 used for?
EPS 80 is typically used for external wall insulation, roof insulation and floor insulation. In short: entry-level EPS strength class; standard EWI insulation board; lowest cost per R-value.
What is the tensile strength of EPS 80?
EPS 80 has a typical tensile strength of 0.22 MPa (0.0319 ksi) — weaker than 96% of polymer grades. Strength varies by condition: see the 5 listed tempers.
Is EPS 80 easy to machine?
Yes — machinability is rated excellent (90/100, better than 95% of polymer grades). Hot-wire cutting, band sawing and high-speed milling all work; if the hot wire travels too slowly the foam melts and slumps. Cut beads carry a strong static charge, so run vacuum extraction.
Can EPS 80 be welded?
Not readily — weldability is rated poor (25/100). Not fusion weldable. Blocks are secondary-fused with steam in the mould; on site, joints are made with solvent-free polyurethane foam adhesive or water-based adhesive mortar.
What surface finishes work on EPS 80?
The surface must be protected with a base-coat render plus reinforcing mesh, cement board or a metal facing. Use water-based coatings only — solvent-based paints and bitumen attack the surface.
Can EPS 80 be formed, bent or molded?
Steam-moulded from pre-expanded beads into blocks or shaped parts. After demoulding, age 3–6 weeks to stabilise dimensions before cutting to board.
What is the maximum service temperature of EPS 80?
EPS 80 is rated for continuous use to about 78°C (172 °F), and briefly to 95°C. Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
How much does EPS 80 cost?
EPS 80 is a standard-cost polymer ($$), 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 13163 Thermal insulation products for buildings — Factory made expanded polystyrene (EPS) — CEN (2016)
- Neopor / Styropor — BASF (2022)
- EUMEPS EPS — EUMEPS (2020)
- Inventory of Carbon & Energy (ICE) v3 — EPS — Circular Ecology (2019)
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.