Expanded graphite is a loose and porous worm-like substance prepared from graphite flakes through the processes of intercalation, water washing, drying and high temperature expansion. Expanded graphite can instantly expand 150~300 times in volume when exposed to high temperature, changing from flake to worm-like, so that the structure is loose, porous and curved, the surface area is enlarged, the surface energy is improved, and the adsorption force of flake graphite is enhanced. combined, which increases its softness, resilience and plasticity. The following editor will explain to you several main development directions of expanded graphite:
1. Granular expanded graphite: Small granular expanded graphite mainly refers to 300 mesh expandable graphite, and its expansion volume is 100ml/g. This product is mainly used for flame retardant coatings, and its demand is very large.
2. Expanded graphite with high initial expansion temperature: the initial expansion temperature is 290-300 ° C, and the expansion volume is ≥ 230 ml/g. This type of expanded graphite is mainly used for the flame retardant of engineering plastics and rubber.
3. Low initial expansion temperature and low temperature expanded graphite: the temperature at which this type of expanded graphite begins to expand is 80-150°C, and the expansion volume reaches 250ml/g at 600°C.
Expanded graphite manufacturers can process expanded graphite into flexible graphite for use as sealing materials. Compared with traditional sealing materials, flexible graphite has a wider range of usable temperatures, ranging from -200°C to 450°C in air, and has a small thermal expansion coefficient. It has been widely used in petrochemical, machinery, metallurgy, atomic energy and other industries.
Post time: Sep-14-2022