Austrian insulation material manufacturer Austrotherm has commissioned a recycling process for XPS insulation boards at its Purbach facility. The process enables the return of production waste and scrap to the manufacturing process. This positions the company as a pioneer in a market segment that has previously had hardly any closed material loops. The development is part of a broader sustainability strategy that also aims to improve the CO2 balance of production.
Technical Process: From Scrap to Raw Material
Austrotherm's new recycling process begins at the production stage of XPS insulation boards. Extruded polystyrene hard foam is created by foaming polystyrene granulate under pressure and heat. This regularly produces scrap residues and waste – for example through format adjustments or quality checks. These materials were previously either thermally recycled or disposed of in landfills.
The new process mechanically shreds the scrap residues and feeds them back into extrusion as secondary raw material. Crucial is the preparation: the material must be conditioned so that it has the same properties as primary granulate. Austrotherm has developed its own process parameters to enable homogeneous mixing with virgin material. The proportion of recycled material in the finished insulation boards can vary depending on the product line without compromising the regulatory requirements for compressive strength, thermal conductivity, or dimensional stability.
Savings Potential: Material, Energy, CO2
Recycling XPS scrap in closed loops directly reduces the need for primary raw materials. Each ton of recycled material saves corresponding amounts of polystyrene granulate, which is petroleum-based. This not only reduces the raw material bill but also decreases dependence on volatile commodity markets. Polystyrene has experienced significant price fluctuations in recent years, which have complicated the calculation of insulation materials.
The process also offers energy advantages: preparing scrap is less energy-intensive than producing primary granulate from crude oil. While mechanical shredding and conditioning are not energy-free, the effort is significantly less than petrochemical synthesis. The CO2 balance improves accordingly. Austrotherm has not yet provided concrete figures for CO2 savings per ton of recycled material, but the direction is clear: each percentage point of recycled content reduces the ecological footprint of the insulation board.
Economic Perspective: Competitive Advantage through Resource Efficiency
The recycling process gives Austrotherm multiple competitive advantages. First, material costs decrease; second, the environmental balance of products improves – an increasingly important criterion in tenders and building certification. Third, the company strengthens its position in a market characterized by rising regulatory requirements. EU Taxonomy and national sustainability regulations are putting pressure on manufacturers to increase the proportion of secondary raw materials and demonstrate the circular capability of construction products.
The investment in the recycling facility pays for itself through savings in raw material costs and avoided disposal costs. Additionally, recyclable products can serve as a differentiating feature in increasingly sustainability-oriented markets such as Germany, Austria, and Switzerland. Other insulation manufacturers such as ROCKWOOL or ISOVER have been using recycling for mineral wool for years – for XPS, Austrotherm is a pioneer.
Scalability and Industry Signals
The question of scalability of the process is decisive for the significance of the innovation. Austrotherm produces at several locations in Central and Eastern Europe. Transferring the process to other plants would multiply the overall impact. From a technical standpoint, there is nothing against it: mechanical preparation and recycling is not a site-specific process, but can be implemented at any extrusion facility with appropriate investment.
With this, Austrotherm sends a signal to the industry. XPS was long considered difficult to recycle because the material has closed cells and rarely comes back in pure form. The new process shows that closed loops are possible here too – at least for production waste. Taking back and recycling installed XPS from deconstruction remains a significantly larger challenge, as contamination, aging, and logistical barriers are added. Nevertheless, the approach is a step toward recycled building materials and circular economy.
Classification: Between Pioneer Role and Industry Pressure
Austrotherm is responding to several parallel developments with the recycling process. On one hand, regulatory pressure is increasing: the EU Construction Products Regulation is being revised to incorporate circular economy requirements and environmental product declarations. On the other hand, demand for sustainable insulation materials is rising from building owners, planners, and public clients. Certification systems such as DGNB, LEED, or BREEAM rate the proportion of secondary raw materials positively.
At the same time, competition with alternative insulation materials is intensifying. Mineral wool and renewable raw materials such as wood fiber insulation are positioning themselves as ecological alternatives to polystyrene insulation materials. Austrotherm must therefore not only prove the technical performance of its XPS products but also credibly demonstrate their sustainability. The recycling process in Purbach is an important component of this strategy.
Outlook: Circular Capability as a Product Feature
Austrotherm's recycling process marks a turning point in insulation material production. It shows that even petroleum-based materials can be integrated into closed loops if processes are designed accordingly. For the industry, the question now is how quickly other manufacturers will follow and whether the approach can be extended to post-consumer material. Technical feasibility is the first step – the economic and logistical implementation on a larger scale will be the real challenge.
