The chemical production machinery industry utilizes three separate forms of impervious graphite tubes; resin bonded, carbon bonded graphite, and completely graphitized. Increasing style manufactured by the graphite tube suppliers has different characteristics and cost consequences, which should be taken into account for each application.
CARBON BONDED TUBE
Carbon bonded graphite is a combination of extruded graphite flour, resin, and lubricants to form the tube together. Then, the tube is subjected to a temperature of 1200 deg C, resulting in a tube containing both amorphous carbon and graphite. The lower production temperature lowers the electricity consumption and the wear and tear on the furnace relative to the utterly graphitized pipeline. It could, therefore, be a less expensive tube than the fully graphitized one. The tubing usually has a porosity of 8-10 percent. This is rendered impervious in a bake/treat cycle with phenolic resin. It has superior thermal properties relative to the resin bonded pipeline, and better thermal and mechanical shock resistance.
RESIN GRAPHITE TUBE
A resin-bound tube consists of graphite powder mixed with a resin binder, which is then extruded to the required length. The large concentration of resin results in a non-porous tube that doesn't need an extra stage of resin impregnation. The tube is heated at 250 Deg C after extrusion and then cut to shape. The resin bonded tube's most significant benefit is the expense. The expense can be as small as 1⁄2 that of a tube that is partly graphitized or entirely graphitized. This can be included in other applications. However, it can experience corrosion in higher temperatures and more corrosive applications and significantly reduce operating life compared with the other two popular tube offerings.
FULLY GRAPHITIZED TUBE
The completely graphitized tube contains the same simple raw materials as the bonded graphite tube with steel. The primary distinction is that in a graphitizing furnace, at 2800 Deg C, the tube is graphitized after being formed. This phase extracts all the amorphous oil. This results in superior thermal properties, including the highest thermal conductivity, lowest thermal expansion intensity, excellent fatigue tolerance, and increased durability and flexibility concerning the other two tube alternatives.
