Sealing products made from expanded natural graphite.

SIGRAFLEX flexible graphite foil, manufactured from natural graphite, is a homogeneous material without adhesives or binders. The material properties are stable for the long term, and SIGRAFLEX retains its sealing effect when the surface pressure reduces during operation - a major advantage over other materials. Inhibitors can be added to enhance oxidation or corrosion resistance of the flexible graphite.

SIGRAFLEX foils feature outstanding oxidation resistance in comparison with other industrial graphite foils, making them ideal for high-temperature processes. As a general rule, the lower the material’s weight loss, the better it will perform on the long term. SIGRAFLEX APX2 foil generally only loses 0.6% of its weight at 670°C (1238°F) – while conventional industrial foils may lose up to 40%. SGL Group’s graphite materials and products are tested, standardized and safe. They meet a wide range of standards and regulations. We face the challenges which regulatory legislation can pose and demonstrate the high performance of our products on a regular basis. SIGRAFLEX products comply with national and international standards and thus provide our customers with a maximum level of safety.

SIGRAFLEX is elastic and malleable, and its superior sealing properties make it exceptionally dependable. SIGRAFLEX is a soft material which is easily compressible, but exhibits little elastic deformation or springback. This makes the material easily adaptable to any sealing surface it is applied to – even under difficult conditions, such as very rough surfaces. 

The material properties are stable for the long term, and SIGRAFLX retains its sealing effect when the surface pressure reduces during operation - a major advantage over other materials. High-purity foils perform with long-term stability and reliability – since 1972. An ash content of lower than 0.15% makes SIGRAFLEX foils the first choice – even under the strictest requirements, such as those in sensitive processes in power plants. In comparison with other sealing materials, the leakage rate of SIGRAFLEX high purity foils remains consistent, even under long-term use.

SPETECH supplies following SIGRAFLEX foil grades: APX, APX2, C, K, TF, Z, ZX.

SPETECH is an authorized distributor of SIGRAFLEX^® graphite. ©SGL CARBON GmbH.