From the Sector

The DITF is leading the joint project "DACCUS-Pre*". The basic idea of the project is to develop a new building material that stores carbon in the long term and removes more CO₂ from the atmosphere than is emitted during its production.       

In collaboration with the company TechnoCarbon Technologies, the project is now well advanced - a first demonstrator in the form of a house wall element has been realized. It consists of three materials: Natural stone, carbon fibers and biochar. Each component contributes in a different way to the negative CO₂ balance of the material:

Two slabs of natural stone form the exposed walls of the wall element. The mechanical processing of the material, i.e. sawing in stone cutting machines, produces significant quantities of stone dust. This is very reactive due to its large specific surface area. Silicate weathering of the rock dust permanently binds a large amount of CO₂ from the atmosphere.

Carbon fibers in the form of technical fabrics reinforce the side walls of the wall elements. They absorb tensile forces and are intended to stabilize the building material in the same way as reinforcing steel in concrete. The carbon fibers used are bio-based, produced from biomass. Lignin-based carbon fibers, which have long been technically optimized at DITF Denkendorf, are particularly suitable for this application: They are inexpensive due to low raw material costs and have a high carbon yield. In addition, unlike reinforcing steel, they are not susceptible to oxidation and therefore last much longer. Although carbon fibers are more energy-intensive to produce than steel, as used in reinforced concrete, only a small amount is needed for use in building materials. As a result, the energy and CO₂ balance is much better than for reinforced concrete. By using solar heat and biomass to produce the carbon fibers and the weathering of the stone dust, the CO₂ balance of the new building material is actually negative, making it possible to construct CO₂-negative buildings.

The third component of the new building material is biochar. This is used as a filler between the two rock slabs. The char acts as an effective insulating material. It is also a permanent source of CO₂ storage, which plays a significant role in the CO₂ balance of the entire wall element.

From a technical point of view, the already realized demonstrator, a wall element for structural engineering, is well developed. The natural stone used is a gabbro from India, which has a high-quality appearance and is suitable for high loads. This has been proven in load tests.  Bio-based carbon fibers serve as the top layer of the stone slabs. The biochar from Convoris GmbH is characterized by particularly good thermal insulation values.

The CO₂ balance of a house wall made of the new material has been calculated and compared with that of conventional reinforced concrete. This results in a difference in the CO₂ balance of 157 CO₂ equivalents per square meter of house wall. A significant saving!

* (Methods for removing atmospheric carbon dioxide (Carbon Dioxide Removal) by Direct Air Carbon Capture, Utilization and Sustainable Storage after Use (DACCUS).

Carbon fiber-reinforced polymer lamellas are an innovative method of reinforcing buildings. There are still many unanswered questions regarding their recycling, however. A research project by Empa's Mechanical Systems Engineering lab is now set to provide answers. Thanks to the support from a foundation, the project could now be launched.

The construction sector is responsible for around 60 percent of Switzerland's annual waste. The industry's efforts to recycle demolition materials are steadily increasing. Nevertheless, there are still end-of-life materials that, for the time being, cannot be reused as recycling would be too time-consuming and expensive. One of these are carbon fiber-reinforced polymer (CFRP) lamellas.

Making buildings "live" longer
The reinforcing method developed by Urs Meier, former Empa Director at Dübendorf, has been used in infrastructure construction for 30 years. CFRP lamellas are attached with epoxy adhesive to bridges, parking garages, building walls and ceilings made of concrete or masonry. As a result, the structures can be used for 20 to 30 years longer. The method is increasingly being applied worldwide – mainly because it massively improves the earthquake resistance of masonry buildings.

"By significantly extending the lifespan of buildings and infrastructure, CFRP lamellas make an important contribution to increasing sustainability in the construction sector. However, we need to find a way how we can further use CFRP lamellas after the buildings are being demolished," explains Giovanni Terrasi, Head of the Mechanical Systems Engineering lab at Empa. To achieve this, he wants to develop a method for recycling CFRP lamellas. Convinced by this idea, a foundation supported it with a generous donation. The project officially launched in October.

Gentle separation
First, a mechanical process will be developed to detach the CFRP lamellas from the concrete without damaging them. Initial tests at Empa are encouraging: After the lamellas were separated from the concrete, they still had a strength of 95 percent – even if they had already been used for 30 years.

Then, the demolished CFRP lamellas shall be used to produce reinforcement for prefabricated components. Terrasi's goal: saving thousands of tons of CFRP lamellas from ending up in landfills after the demolition of old concrete structures and reuse them in low-CO₂ concrete elements. After completion of the project, Giovanni Terrasi and his team – consisting of Zafeirios Triantafyllidis, Valentin Ott, Mateusz Wyrzykowski and Daniel Völki – want to produce railroad sleepers from recycled concrete, which will be reinforced and prestressed with demolition CFRP lamellas. This would give the "waste-to-be" material a second life in Swiss infrastructure construction.

• Low impact of Ukraine war on business performance in 1st quarter
• 12.2% increase in sales to €270.9 million based on growth in all four business units
• Adjusted EBITDA improves by 11.5% to €36.8 million

SGL Carbon generated consolidated sales of €270.9 million in Q1 2022 (Q1 2021: €241.5 million). This corresponds to an increase of €29.4 million or 12.2% compared to the same period of the prior year. All four business units contributed to the pleasing increase in sales. In parallel, adjusted EBITDA improved by 11.5% to €36.8 million in the reporting period.

Sales development
In the first three months of fiscal 2022, the sales increase of €29.4 million was driven by all four operating business units: Graphite Solutions (+€11.3 million), Carbon Fibers (+€6.6 million), Composite Solutions (+€7.2 million) and Process Technology (+€6.0 million).
In particular, sales to customers in the automotive and semiconductor industries and a significant recovery in the industrial applications segment were key factors in the increase in sales. Sales of the Process Technology business unit to customers in the chemical industry also developed pleasingly. The effects of the war in Ukraine, which has been ongoing since the end of February 2022, had only a little impact on SGL Carbon's sales performance in the 1st quarter.

Earnings development
Despite the increasingly difficult market environment in the course of Q1 2022, associated with temporary supply and production bottlenecks at their customers, temporarily interrupted transport routes, and significantly higher energy prices, SGL Carbon was able to keep the adjusted EBITDA margin almost stable year-on-year at 13.6%.  
Adjusted EBITDA increased by 11.5% to €36.8 million in the reporting period. Higher capacity utilization in the business units and product mix effects contributed to the improvement in earnings, together with the cost savings achieved as a result of the transformation. By contrast, higher raw material, energy and logistics costs as of end of February 2022 had a negative impact on earnings. The Carbon Fibers business unit was particularly affected by the energy price increases. One-time expenses of €9.2 million in conjunction with energy transactions burdened the Carbon Fibers business unit in the 1st quarter of 2022.  
To secure our production and delivery capabilities, around 85% of the energy requirements of the entire SGL Carbon for 2022 are price-hedged.
Adjusted EBITDA and EBIT do not include in total positive one-time effects and special items of €8.5 million, among other things from the termination of a heritable building right to a site no longer in use. Taking into account the one-time effects and special items presented as well as depreciation and amortization of €14.1 million, reported EBIT increased by 83.5% to €31.2 million (Q1 2021: €17.0 million). The net profit for the period developed correspondingly and more than tripled from €6.1 million to €21.4 million in a quarter-on-quarter comparison.

Outlook
The sales and earnings figures for the 1st quarter 2022 confirm the stable demand from different market segments. Price increases and volatility in the availability of raw materials, transportation services and energy were largely offset by savings from the transformation program and pricing initiatives at the customers.
For 2022, SGL Carbon continues to expect volatile raw material and energy prices, which were included in their forecast for 2022 at the time of planning. However, there are uncertainties about the extent and duration to which SGL Carbon and the customers will be affected by the impact of the war in Ukraine or temporary supply chain disruptions due to the lockdowns in China. Therefore, SGL Carbon's outlook for fiscal 2022 does not include supply and/or production interruptions at customers or the impact of a possible energy embargo that cannot be estimated at this time.  
SGL Carbon's forecast also implies that factor cost increases can be at least partially passed on to the customers through pricing initiatives. SGL Carbon has also included the revenue and earnings impact from the expiry of a supply contract with a major automobile manufacturer at the end of June 2022 in our forecast.

Teijin Carbon Europe introduces a new thermoplastic carbon fiber tape (TPUD) based on PPS. The new Tenax™ TPUD with PPS matrix allows entry in new cost-sensitive markets while offering the typical TPUD advantages like high resistance to chemicals and solvents, low flammability, storage or shipping at room temperature and recyclability.  

Due to its flame retardant properties and low smoke emission, it can be used in interior applications of aircraft or rail vehicles, among others. The maximum continuous operating temperature is up to 220 °C. Very low water absorption, excellent creep resistance even at elevated temperatures and high dimensional stability round off the property portfolio of this new TPUD. It is therefore also suitable for demanding applications in the aerospace, oil & gas, sporting goods or industrial sectors, while remaining cost-effective. These properties make the product perfect for highly automated processing routes such as ATL or AFP in combination with overmolding for complex geometries. Production start for the Tenax™ TPUD with PPS matrix is the first quarter in 2021.

For almost 10 years, unidirectional tapes (TPUD) have been manufactured from carbon fibers and thermoplastics in Heinsberg, Germany. The semi-finished products have so far been offered with PEEK or PAEK – and PPS is now added to the list of available matrixes. PPS allows a lower process temperature compared to PEEK or PAEK. For the industrial market in particular, increasing the production rate to make processes more cost-efficient is an opportunity.