Polyurethane vs Strafor EPS: Decorative Profile Selection Guide
Compare rigid polyurethane and EPS decorative profiles across surface hardness, sharp detail, density, fire resistance, and installation requirements.
Material Characteristics and Density Parameters
Rigid polyurethane (PU) decorative moulding is manufactured with a closed-cell microstructure, yielding a targeted production density of approximately 160 kg/m3 within a standard 150-220 kg/m³ (production target ~160 kg/m³) operational range. This high structural density ensures thermal stability across temperatures ranging from -100 °C / +80 °C and maintains a water absorption rate under 1%. In contrast, expanded polystyrene (EPS) profiles possess a significantly lower density and open cellular boundaries, making EPS lighter but far more susceptible to physical impact and moisture ingress over prolonged exposure.
In European architectural projects, material selection must strictly align with building durability mandates, transport resilience, and multi-country application requirements. While lower-density materials present handling advantages during initial freight, high-density polyurethane maintains its geometric dimensions against thermal expansion and structural shifts over the lifespan of the building facade.
Technical Performance Comparison
Evaluating physical criteria helps technical specifiers determine whether polyurethane or expanded polystyrene suits specific project requirements:
| Criterion | Rigid Polyurethane (PU) | Expanded Polystyrene (EPS) |
|---|---|---|
| Material Density | 150-220 kg/m³ (production target ~160 kg/m³) | 15–30 kg/m3 |
| Surface Hardness & Impact | High resistance to dents and mechanical force | Low resistance; easily indented by contact |
| Sharpness of Detail | Crisp, sharp architectural lines and intricate relief | Softened, granular edge definition |
| Thermal Resistance Range | -100 °C / +80 °C | -40 °C to +65 °C |
| Water Absorption Rate | below 1% (Closed-cell structure) | Higher moisture absorption over time |
| Exterior Paint Requirement | UV-resistant paint mandatory for exteriors | Specialized protective coating required |
When to Choose Expanded Polystyrene (EPS) Profiles
Expanded polystyrene (EPS) decorative mouldings remain a viable solution for specific interior applications where physical contact is entirely avoided. High-ceiling cornices, indirect LED lighting coves mounted out of reach, and budget-conscious residential refurbishments benefit from the light weight and low material expense of EPS. Because EPS requires minimal structural support, rapid installation can be achieved in non-critical spatial zones.
However, installer teams must handle EPS carefully during transport across international supply chains, as soft profile edges easily suffer transit damage compared to rigid polymers engineered by manufacturers like Polure. When installed out of reach, EPS performs adequately, provided it is not subjected to mechanical impact, solvents, or direct thermal strain.
High-Performance Applications for Rigid Polyurethane
Rigid polyurethane (PU) profiles excel in environments subjected to routine physical contact, such as chair rails, door surrounds, skirting boards, and exterior facades. When applied to exterior facades, polyurethane components require high-grade UV-resistant topcoat paint to prevent UV degradation over time. Furthermore, while polyurethane columns and pilasters offer exceptional aesthetic relief, these elements are purely decorative and must never be utilized to carry structural loads.
Polyurethane profiles leave the factory pre-primed. Applying an additional site primer remains optional prior to final painting, depending on surface preparation requirements and contract specifications. Polyurethane profiles deliver the edge sharpness required for historic restoration projects across Europe, matching traditional plaster profiles without adding excessive dead load to the building envelope.
Installation Standards and Multi-Country Guidelines
Achieving a durable installation with polyurethane profiles requires strict adherence to mechanical and adhesive assembly procedures across European project sites. Substrates must be clean, dry, and structurally sound prior to mounting profiles, which must be accurately cut using a 45-degree miter block.
- Profiles must be bonded exclusively using specialized polyurethane (PU) assembly adhesive; the use of standard silicone adhesives is strictly forbidden due to inadequate shear strength.
- Installer crews must execute mandatory mechanical fastening using screws to secure the profiles firmly while the adhesive cures.
- Final finishing requires applying surface putty over joint lines and screw heads, sanding the cured filler with 180-220 grit sandpaper, applying an optional additional primer, and finishing with 2 coats of quality topcoat paint.