SEAL FACE MATERIAL SELECTION

Mechanical Seals and Gasket Supply is our Specialty. American Seal and Packing is a leading manufacturer & distributor of mechanical seals, Grafoil, gasket material, cut gaskets and quality o-rings providing innovative solutions to mechanical seal problems. We're finding better ways to serve our customers all the time. In addition to our expanding line of industrial mechanical seals, we're updating and upgrading this web site to provide you more information about our company and our products.

Carbon:   Carbon-graphite is a self-lubricating material, and is a versatile seal face material used with mating rings of harder materials such as silicon carbide, alumina, or tungsten carbide.  AST's standard grade, Pure Carbon P-658RC, has superior wear characteristics and broad chemical resistance.  For severe corrodents including hydrofluoric and nitric acids, special carbon grades are available.
Recommended:
Most services
Marginal lubrication
Not recommended:
Severe abrasive service
 

Silicon Carbide:  Silicon carbide resists a wide range of chemicals. It is also the hardest of seal face materials, giving it excellent abrasion resistance. Silicon carbide's high thermal conductivity and low coefficient of friction are essential for the effective sealing of volatile liquids and high pressure services. Reaction-bonded silicon carbide performs best at the highest speeds and pressures, but can be corroded by caustics and hydrofluoric acid.  Self-sintered silicon carbide resists all chemicals, and has running characteristics almost as good as reaction-bonded silicon carbide.

Recommended:
Most services
High speed and pressure
Not recommended:
Caustics (reaction-bonded only)
Hydrofluoric acid (reaction-bonded only)
 

Alumina Ceramic:  Alumina ceramic is inert in pure form and is used in chemical and water applications as a mating ring for carbon-graphite primary rings. Alumina is limited to moderate speeds and pressures. Alumina is susceptible to thermal shock, and is not recommended for services involving periods of dry running or for petroleum refinery services.

Recommended:
Low speeds and presssures
Not recommended:
Dry running and marginal lubrication
 

Tungsten Carbide:  Tungsten carbide is a popular mating ring for carbon-graphite primary rings in hydrocarbon process applications and rugged applications involving vibration and mechanical shock. Tungsten carbide is a good mating face for silicon carbide primary rings in severe abrasive services, but is not as resistant to corrosion as silicon carbide.

Recommended:
Abusive service
Not recommended:
Most metal salts, acids

Our Select Manufacturers

  • Flow Serve
  • Borg Warner
  • Durametallic
  • AST

Our Select Manufacturers

  • JM Clipper
  • Graftech
  • Lamons
  • Vulcan

Contact

  • Call us at: 714-361-1435
  • Fax: 714-593-9701