Metallized Carbon Corp.

United States

Mechanical seal rings are used to seal the clearance between the rotating shaft and the stationary housing in equipment such as pumps and mixers, so that liquid can not leak out through this clearance. These sealing mechanisms are often referred to as shaft seals or pump seals. Metallized Carbon Corporation manufactures the mechanical Primary Rings or CarbonGraphite Wear Faces used in many of todays most sophisticated and reliable mechanical seals for industrial, aerospace and military applications. These mechanical seal assemblies usually consist of a primary seal ring manufactured using carbon graphite materials, a counter face ring, secondary (O-ring) seal rings, springs, fasteners, and a metal housing. Mechanical seal assemblies are also used to seal gases in high speed compressors. These dry gas seals are double mechanical seals that utilize a controlled barrier gas and spiral grooves in the counter face which provide aerodynamic lift off or gas lubrication between the seal faces. Mechanical seal primary rings can be supplied to customer drawings and specifications. The rings can be supplied plain, shrink fitted or cemented in metal retaining rings. Metcar mechanical seal rings can also be supplied with the sealing face lapped flat to one helium light band.

Metcar Block Bearings are ideally suited to the textile industry due to their inherent self-lubricating properties. Metcar Block Bearings are unexcelled when used as submerged bearings in textile applications such as dying, bleaching, sanforizing, mercerizing, washing and other wet processing operations. Metcar Block Bearings are low in friction, will not score the mating shaft, have high corrosion resistance and are extremely durable. Users report maintenance free operation with Metcar Bearings for periods up to 10 years. Special sizes up to 4-12" bore can be economically manufactured to meet your exact requirements.Completely self-lubricatingConstant and low coefficient of frictionUse dry or submergedOutstanding wear resistanceNo galling or seizing to shaftDimensionally stable (dry or submerged)Non-contaminatingOperates quietlyOther sizes available to meet your exact operating requirementsBearing assemblies available (see other pages)High corrosion resistance

For General Purpose Self-lubricating Applications up to 350F Operating Temperature (Dry or Submerged) Metcar 1010 Babbitt is an especially formulated self-lubricating bearing material low in friction, corrosion resistant, extremely durable and can be used for both dry and submerged application. The sizes listed are normally available from stock and have been sized to provide long bearing life under normal load and speed conditions, The dimensions shown will also provide proper bearing press fit in housings and correct shaft running clearance for operating temperatures up to 350F. Metcar Bearings can be manufactured in sizes up to 6" diameter shaft. Bearings sized to meet your exact operating conditions are available on short order.Completely self-lubricatingConstant and low coefficient of frictionUse dry or submergedOutstanding wear resistanceNo galling or seizing to shaftDimensionally stable (dry or submerged)Non-contaminatingOperates quietlyOther sizes available to meet your exact operating requirementsBearing assemblies available (see other pages)High corrosion resistance

Type SA-PB Pillow Blocks and Flange Blocks are a uniquely designed compact unit (Patented) requiring minimum support space. These units are self-aligning, ruggedly constructed and suitable for non- lubricated heavy duty applications. Fitted with a variety of Metcar Self-lubricating Bearing Grades which can be operated dry or submerged to temperatures of 1000 F. Special features of these heavy duty units are:Completely self-aligning (compensate for shaft deflection and misalignment)Can be used dry or submerged to temperatures of 1000 F.Replaceable Bearing Cartridge can be rotated 180 for double life (no need to remove from shaft)Interchangeable with most standard ball bearing pillow and flange blocks.Operate freely and quietly under heavy loadsCan be modified for thrust loading10 sizes available for shafts up to 3-38"2 Standard Bearing Cartridge lengths available (A and A-Ext.) Bearing length (A) medium duty applications, bearing length (A-Ext.) heavy duty applications.Unlimited Bearing Cartridge length available for unusual load and speed conditions.Available in stainless steel for corrosive applicationsNormally supplied with the following grades of Self-lubricating Metcar Bearings:Metcar 1010 Babbitt Dry or submerged applications up to 350 F.Metcar 1515 Copper High temperature applications up to 750 F.Metcar 2500 High temperature applications up to 1000 F.

Type SA-PB Pillow Blocks and Flange Blocks are a uniquely designed compact unit (Patented) requiring minimum support space. These units are self-aligning, ruggedly constructed and suitable for non- lubricated heavy duty applications. Fitted with a variety of Metcar Self-lubricating Bearing Grades which can be operated dry or submerged to temperatures of 1000 F. Special features of these heavy duty units are:Completely self-aligning (compensate for shaft deflection and misalignment)Can be used dry or submerged to temperatures of 1000 F.Replaceable Bearing Cartridge can be rotated 180 for double life (no need to remove from shaft)Interchangeable with most standard ball bearing pillow and flange blocks.Operate freely and quietly under heavy loadsCan be modified for thrust loading10 sizes available for shafts up to 3-38"2 Standard Bearing Cartridge lengths available (A and A-Ext.) Bearing length (A) medium duty applications, bearing length (A-Ext.) heavy duty applications.Unlimited Bearing Cartridge length available for unusual load and speed conditions.Available in stainless steel for corrosive applicationsNormally supplied with the following grades of Self-lubricating Metcar Bearings:Metcar 1010 Babbitt Dry or submerged applications up to 350 F.Metcar 1515 Copper High temperature applications up to 750 F.Metcar 2500 High temperature applications up to 1000 F.

Carbon-graphite bearings are used for running submerged in low viscosity liquids like water, gasoline, hot oil, solvents, strong chemicals, molten metals, and liquefied gases. Metallic bearings are often not satisfactory for these applications because the hydrodynamic film provided by these low viscosity liquids is not thick enough to overcome the strong atomic attraction between metal bearings and the metal shaft. Since there is no strong atomic attraction between carbon-graphite and a metal shaft, the thin hydrodynamic film provided by low viscosity liquids provides sufficient lubrication for carbon-graphite bearings. Carbon-graphite is also a self polishing, dimensionally stable material. If the shaft is polished to a fine surface finish, the shaft will polish the carbon-graphite material to the same fine, polished finish. When both the shaft and the bearing have this fine polished surface finish, a thin hydrodynamic film is sufficient to provide lubrication. Plastic or polymer bearing materials often fail in these submerged applications because of their tendencies to swell, soften or deteriorate. Metcar materials can handle all common chemicals except for a few extremely strong oxidizing agents such as hot, concentrated nitric acid.

Radial seal ring assemblies are used to seal the clearance between a rotating or reciprocating shaft and the stationary housing on many types of machines. Carbon-graphite radial seal assemblies were developed to help solve serious leakage problems that occur when materials such as leather, plastic, composite or elastomeric materials are utilized in the stuffing box seals installed on industrial blowers, pumps and other turbo machinery. These problems occur because of wear, thermal degradation, chemical attack and dimensional stability problems with elastic seal ring materials. To accommodate some anticipated movement in a reciprocating or rotating shaft such as thermal expansion or run out, carbon-graphite radial seal rings are normally designed to float with OD clearance within a chamber in the stuffing box. This allows a close clearance seal to be maintained between the OD of the shaft and the ID of the carbon-graphite seal ring. Leakage around the OD of the carbon-graphite seal ring is minimized by using a close clearance between the width of the carbon-graphite seal ring and the width of the metallic seal housing cavity. There are two types of carbon-graphite radial seal rings. Close clearance carbon-graphite seal rings are one piece, solid rings that are made to fit with close clearance on the OD of the rotating or reciprocating shaft. If the shaft is expected to expand because of thermal expansion, the carbon-graphite ring should be shrink-fitted into a metal retaining ring. This affords the carbon graphitemetal assembly the same thermal expansion rate as the shaft. The metal retaining ring shrink fitted around the carbon graphite clearance seal should be of the same metal as the shaft. This allows the close clearance between the shaft OD and carbon-graphite seal ring to be maintained even at high temperatures.