Member of SGL Group The Carbon Company. Carbon Brushes for Wind Energy Generators

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1 Member of SGL Group The Carbon Company Carbon Brushes for Wind Energy Generators

2 Carbon brushes made by SGL GELTER. Customized solutions for a wide variety of applications Consistently high quality and performance In-depth production and material knowledge State-of-the-art production site Short production and delivery times ISO 9001, ISO 14001, ISO/TS 16949, and ISO certified More than 25 years' carbon brush manufacturing experience for wind energy generators

3 CARBON BRUSHES FOR WIND INDUSTRY APPLICATIONS Carbon brushes for wind energy generators Slip ring Brush holder Brush rocker Brushes Our carbon products are notable for their exceptional properties and meet stringent requirements for reliability, robustness, and service life. Our portfolio ranges from carbon brushes and brush holders to brush rockers and slip rings. We offer tailored solutions that comply with high quality and environmental standards ISO 9001, ISO 14001, ISO/TS and ISO and so meet the demanding requirements of wind generators and turbine manufacturers, wind farm owners, and maintenance providers. Application-specific products for wind energy generators: ɋɋ Grounding and power brushes ɋ ɋ Special brushes for low- and high-humidity climates ɋ ɋ Lightning protection brushes ɋɋ Custom-designed products and shapes ɋɋ Silver- and copper-containing carbon brushes c Brush plates made of metal-graphite and electro-graphite

4 METAL-GRAPHITE FOR WIND ENERGY APPLICATIONS Metal-graphite for carbon brushes A combination of the finest-grade raw materials and unique production processes allows our carbon brushes to offer outstanding performance, with excellent conductivity and uniform wear, even under extreme weather conditions. Range of materials for different absolute humidity conditions Standard-Grades H-Grades L-Grades [gh₂o/m² air] Regions with long periods of extreme absolute humidity values through the year Low absolute humidity: [gh₂o/m² air] Medium absolute humidity: [gh₂o/m² air] High absolute humidity: > 22.0 [gh₂o/m² air] Material data on our metal-graphite grades for carbon brushes in wind energy applications1) Typical properties Units RC27 RC42 RC42L RC42H RC53 RC67 RC55 RC60 RS65 RS70 RE54 Current density A/cm Peripheral speed m/s Density g/cm Hardness rockwell B HR 10/ Flexural strength N/mm Resistivity µωm Grade designation2) Cu Cu Cu Cu Cu Cu Cu Cu Ag Ag E ¹) Brush pressure: 2.2 n/cm² 2) Cu: Metal-graphite with mainly Cu content; Ag: Metal-graphite with mainly Ag content; E: Electro graphite

5 SGL GELTER Reliable power transmission in electrical machines. SGL GELTER offers high-quality carbon and metal-graphite brushes worldwide even for challenging applications. Our combination of in-depth production and material knowledge with short production and delivery times enables us to be a reliable supplier for power transmission in electrical machines. SGL GELTER is a joint venture between Gelter and SGL Group The Carbon Company, a leading global manufacturer of carbon-based products. SGL GELTER manufactures carbon and metalgraphite brushes for a number of different fields of application, including the automotive, traction, industrial, mining, and wind energy sectors. Carbon brushes for wind energy generators Renewable energies are becoming increasingly important in worldwide energy generation. Wind energy is the most rapidly growing form of renewable energy. In both onshore and offshore areas, giant wind farms are springing up. We have a wide range of carbon and metal-graphite grades to cover all market needs. Our close cooperation with SGL Group, as the raw material producer, allows us to develop grades tailored to customer requirements. With our state-of-the-art production site in Madrid/Spain, we manufacture high-quality brushes in a short time and supply our customers worldwide. Carbon brushes are very important functional components of wind energy generators. They are used as electrical contacts for power transmission. Our expertise in materials and applications makes us a sought-after partner in the wind energy industry. We have more than 75 years' experience in the development, production, and application of carbon brushes. SGL GELTER has been supplying the wind energy industry for more than 25 years. We are continually developing new products and services to solve challenges posed by both technological advances in wind energy generation and its geographical expansion. c Carbon brushes for wind energy generators

6 Contact SGL GELTER S.A. C/San Dalmacio Madrid/Spain /0.5 E Printed in Germany This document has been prepared according to the best current knowledge and is intended to provide general information about our products and their use. In view of the wide variety of possible applications, the data cited in this document should be regarded as general information and is no guarantee of certain features of our products in a given case. If you are interested in placing an order, please ask for information regarding the features needed for your proposed application. SGL GELTER S.A. C/San Dalmacio 33 I Madrid/Spain