Graphite, the core material for manufacturing graphite seals, is crystalline, overlapping, natural graphite. Thermal decomposition of these bonds results in loose flakes. These flakes are then compressed into a film whereby the graphite particles realign themselves. Through this alignment, properties with large directional dependency result - such as thermal and electrical conductivity.
As graphite has metallic lustre and a significant thermal and electrical conductivity, it may be called a metal-carbon modification.
This is how one may define graphite in general terms. But what advantages does graphite offer over other materials?
Grades: nuclear grade: 99.8%, chemical grade (or also industrial grade) 98%.
- stable in temperatures from -220°C up to +550°C (in pure oxygen up to +300°C)
- high chemical resistance against almost all media (see chemical resistance list)
- good mechanical properties over the entire temperature range
- very flexible
- resistant to aging, does not become brittle
- safe for human health
- resistant to radiation
- large range between the minimum and maximum pressure
- universal use
You can get more information about the chemical resistance of graphite foils here.