Product 01 · XPS
Inside an XPS board the cells are independent, sealed air bubbles. This gives an environmentally friendly insulation material with high compressive strength, low water absorption, damp resistance, low air permeability, light weight, corrosion resistance, very high ageing resistance (almost no ageing over long service) and low thermal conductivity.
Product name: XPS insulation board · Foreign name: Extruded Polystyrene Board · Also known as: XPS board, extruded board
It is widely used for insulation of dry walls, flat concrete roofs and steel-structure roofs, and for damp-proofing and insulation of low-temperature storage floors, insulation under low-temperature radiant floor heating pipes, car-park decks, airport runways and expressways. It is also used to control frost heave of the ground, and is a cost-effective, good-quality thermal insulation and damp-proof material for the construction industry.
Technical Data
| Test item | Unit | Typical value / range |
|---|---|---|
| Thermal conductivity (mean temperature 25 °C) | W/(m·K) | ≤0.028–0.030 |
| Density (apparent) | kg/m³ | 32–45 |
| Compressive strength (at 10% deformation) | kPa | 150 / 200 / 250 / 300 / 350 / 400 / 500 / 700 |
| Water absorption (by volume, soaked 28 d) | % | ≤1.0–2.0 |
| Volume stability | % | ≤1.0 |
| Dimensional stability (70 °C, 48 h) | % | ≤2.0 |
| Fire performance class | — | B1 (flame-retardant) / B2 (combustible) / standard type |
| Oxygen index (OI) | % | ≥26–30 |
| Water vapour permeability coefficient | ng/(Pa·m·s) | 1.5–3.5 |
| Service temperature | °C | -50 to +75 (short term ≤ 80) |
| Service life | Years | 30–40 |
The table above compiles the company's common supply ranges and product literature data, for selection reference; acceptance values for projects follow the national standard GB/T 10801.2 and the factory inspection report for the batch concerned.
Sizes
| Board thickness | 20 / 25 / 30 / 40 / 50 / 60 / 70 / 80 / 100 mm |
|---|---|
| Standard length | 1200 / 1800 / 2400 mm |
| Standard width | 600 / 900 / 1200 mm |
| Edge type | Plain edge (TF) / tongue-and-groove edge (TG) |
| Surface | Skin face / sanded face / roughened face / grooved (as required by the system) |
| Colour | Natural (light yellow-green), blue, grey and others, varying with the raw material batch |
| Packing | Whole stacks wrapped in heat-shrink film, stacked separately by thickness |
Features
A lower thermal conductivity is the goal of every insulation material. Polystyrene itself is an excellent low-conductivity raw material, and the compact honeycomb structure produced by extrusion foaming blocks heat conduction even more effectively, giving high thermal resistance at controllable cost, clearly below other insulation materials.
The dense closed-cell structure and the fact that polystyrene molecules themselves do not absorb water leave both board faces seamless and water absorption very low, so damp-proofing and vapour control perform well in humid environments and on low-temperature storage floors.
Compressive strength of 150–700 kPa is available by grade. Under car-park decks, floor beds and heavily loaded roofs the boards do not compress or deform easily, so the insulation layer keeps its thickness over the long term.
Ordinary rigid foam insulation tends to age and absorb water after a few years, and performance drops. XPS boards keep their excellent performance even under high vapour pressure, with almost no ageing in long service and a service life of up to 30–40 years.
Flame retardant added during production produces class B1 and class B2 boards. Class B1 is a flame-retardant material, suitable for external wall and roof insulation of high-rise and public buildings.
The boards are easy to transport and to cut, fit well against the substrate, and reduce the amount of wet work and the construction period. They also combine readily with fibreglass mesh and rendering mortar to form the protective system.
Construction
XPS board surfaces are dense, so the work depends on three stages: interface treatment, mechanical fixing and render protection.
| Adhesive mortar | 4–6 kg |
|---|---|
| Rendering mortar | 5–7 kg |
| Alkali-resistant fibreglass mesh | 1.1–1.3 m² |
| Insulation anchor fastener | 6–8 nos. |
| Primer / interface agent | 0.2–0.35 kg |
Actual usage varies with substrate flatness, system build-up and design thickness; the method statement governs.
Storage & Safety
The ground should be level, firm and well drained, with the base of the stacks levelled and protected from damp. For outdoor storage cover the stacks with tarpaulin to avoid surface chalking caused by long-term direct ultraviolet exposure.
Whole stacks are tied upright or flat; sharp objects must not pierce the wrapping film. Packs must not be thrown when loading and unloading, so that board corners do not chip and affect joint quality.
Keep boards away from open flame and welding sparks on site. Cutting is best done with a utility knife, hot wire or a dedicated saw table, and the work area must be kept ventilated and provided with fire-fighting equipment.
Related
Graphite XPS
A silver-grey extruded board with lower thermal transmittance, for high energy-standard projects where the insulation layer is limited in thickness.
Floor Heating Board
A board dedicated to underfloor heating, with mirror reflective film, stopping heat passing into the floor slab.
Tell us the element — wall, roof, underfloor heating or cold store — and the thickness required, and we will advise on common sizes to GB/T 10801.2, send samples and quote batch supply.