Advanced Materials

PCM (Phase Change Material).

PCM is a niche technology with a moderate CO₂ footprint. It is only relevant in specific situations requiring thermal mass in lightweight constructions.

Key Figures

Carbon Footprint (GWP): 2.8 kg CO₂-eq/kg
Density: 800–1800 kg/m³
Expected Lifespan: 25–50 år

What is pcm (phase change material)?

PCM (Phase Change Material) materials that absorb and release large amounts of heat during phase change (typically melting/solidification at 20–28°C). They are incorporated into walls, floors and ceilings to increase the building's thermal mass without extra weight. Used for temperature stabilisation in lightweight buildings.

Carbon Footprint Compared

Standard gypsum ← this material 0.39 kg CO₂/kg

PCM (paraffin-based) 2.8 kg CO₂/kg

Concrete (thermal mass) 0.13 kg CO₂/kg

CLT (low mass) −0.55 kg CO₂/kg

Negative carbon footprint (green) indicates carbon storage. Data based on EPD averages from ECO Platform and estimates per EN 15804.

Typical Applications

check_circle PCM gypsum boards (integrated in walls)
check_circle PCM underfloor heating buffer
check_circle Data centre cooling
check_circle Industrial temperature control

In Renovation

PCM is relevant for renovation of lightweight houses that suffer from overheating in summer. PCM gypsum boards can be installed like normal gypsum cladding and provide increased thermal mass.

Questions about pcm (phase change material)

What is the advantage of PCM over concrete as thermal mass?

PCM stores 5–14 times more energy per kg than concrete during phase change. It provides effective thermal mass in lightweight structures (CLT, steel) that normally have low thermal mass. PCM gypsum boards weigh approximately 13 kg/m² and function like 100 mm concrete.

What are typical PCM materials?

Paraffin wax (petroleum derivative) is the most widely used PCM. Fatty acids and sugar compounds are more sustainable alternatives. Salt hydrates are inexpensive but can have delamination issues over time.

Is PCM technology mature?

PCM gypsum boards are commercially available (KNAUF, MICRONAL). The technology is well-tested but not mainstream. The price is 3–5x higher than standard gypsum boards.

Does PCM reduce cooling requirements?

Yes — studies show that PCM can reduce peak cooling load by 10–30% in well-designed systems. It is most effective in buildings with large daily temperature fluctuations.

Related Materials

Facade & Cladding

Gypsum Board

GWP: 0.39 kg CO₂/kg

Structure

Concrete

GWP: 0.13 kg CO₂/kg

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