Graphite
Graphite is one of the ways in which carbon can occur. It is grayish black with metal brightness, refractory and it exfoliates easily. Graphite is non-magnetic, is a good conductor of heat and electricity.
Graphite
Graphite is common for making rings for sealing the valve spindle and the packing gland pumps. Thanks to the absence of aging and relaxation, repetitive torques and erosion of stems and shafts are avoided. It not suffers physical alterations, although very rapid temperature changes occur. It has low coefficient of friction with stainless steel (0.048) and excellent chemical resistance (pH 0-14).
Graphite rings are obtained in compression mold, starting from graphite paper gr 0.7 density / cm³ without any additive or binder, to the required density, usually 1.6 g / cm³. Naturally they contain a permanent self-lubricating, are excellent thermal conductors and not age nor crystallize. They make an excellent sealing with fluid as vapors. Its resistance to pressure in valves is 300 bar. They are manufactured in accurate measurement of its press or box, in a wide range of diameters, thicknesses and shapes (flat, conical, hexagonal, etc). They can be supplied cut to facilitate assembly into 2 halves or with a single cut.
Resistance to steam temperature is 650° C, but with pure oxygen from 450º C starts its oxidation. In inert atmosphere its temperature range is -240 / + 2500° C and with carbon dioxide from 900º C the oxidation begins.
