Mechanical Packing | Pump & Valve Packing

Mechanical Packing

Mercer Gasket & Shim provides a wide range of high-performance mechanical packing to cater to the most demanding conditions in a wide range of markets. We only carry the highest-quality packing designed to provide superior sealing capabilities in even the most severe environments.

Mechanical valve and pump packings seal mechanical components to reduce leakage. Compression packing—also known as braided packing or sealing rope—is a form of wrapping that expands when compressed and forms a tight seal. Braided packing usually has a square or rectangular cross-section and is made of soft, flexible materials. 

Mercer Gasket & Shim manufactures high-quality mechanical packing to perform in the most demanding industrial conditions. Here we’ll explain how to choose the best mechanical packing for your project and some common applications for these products.

Selecting the Best Mechanical Packing for Your Application

Mechanical packing is most commonly found in centrifugal pumps and mixers. Ring packings are most common for this application—they fit into the stuffing box between the rotating shaft and pump body. The rings expand when pressure is applied, significantly reducing leakage.

Packings come in a variety of materials, sizes, constructions, lubricants, and braid types. Consider the surface speeds, temperatures, and pressures of your application, while also adhering to specific installation procedures.

Mercer offers a comprehensive line of mechanical packing materials in different styles. Our team can help you select the best products for your mechanical packing application.

Mechanical Packing pump and Value

Common Applications

The most popular applications for braided packing include:

  • Centrifugal pumps
  • Rotary pumps
  • Reciprocating pumps
  • Mixers and agitators
  • Generators
  • Valves
  • Expansion joints
  • Soot blowers
  • Rotating equipment

Compression packing is critical in a variety of industries, including petrochemical, paper, steel, utilities, maritime, water treatment, sewage treatment, and food packaging. These applications often require mechanical packing to withstand harsh conditions while sealing substances such as water, gases, acids, solvents, gasoline, oil, and other chemicals. 

Packing Styles

Flax and Ramie:

Style  345    PTFE Coated
Style  921    Tallow Lubricated
Style 921G  Tallow Lubricated w Graphite Coating

PTFE ® Filament:

Style  344,
Style 344-SC w/Silicone core
Style  344BIL w/ High Speed Break in lube
Style  344BIL w/High Speed Break in lube & Silicone core
Style  344T Braided Gasket Tape

Food Grade PTFE ®:

Style  344FDA

Carbon Styles:

Style  4000, w PTFE
Style 4000G Graphite Coated

Tanklid/Hatch Cover:

Style 359

Graphite Filament Nuclear Grade:

Style 8000 Nuclear Grade,
Style 8000G W Graphite Coating
Style 8000LC Industrial Grade

Fiberglass Wire Inserted:

Style 3030INA

Copper Wire:

Style  895

Flexible Graphite:

Style 5000,
Style 5000C, w Carbon Corners
Style 5000CC, w Carbon corners & Carbon core
Style 5000OCC w Carbon Outside/Inside Corners
Style 5000T PTFE Impregnated


Style 3000G,    w/ Graphite & Oiil
Style 3000T      w/ PTFE & Lube
Style 3000T-K  w/ PTFE, Lube & Aramid corners

GFO ®:

Style 8000T
Style 8000T-SC w/Silicone Core
Style 8000T-K

PTFE ® Graphite Blend:

Style 8100,
Style 8100BIL w/ High Speed Break in Lube
Style 8100BIL-K w/ High Speed Break in Lube & Aramid Corners
Style 8200BIL
Style 8500


Style 300

Meta Aramid:

Style 310


Style 320

Aluminum & Lead Foil:

Style 8010 Lead w Graphite, Oil & Core
Style 8011 Aluminum w Graphite, Oil & Core
Style 8012 Lead w Graphite & Oil
Style 8013 Aluminum w Graphite & Oil

Flexible Graphite Wire Inserted

Style  5000I
Style 5000I-FE
Preformed Grafoil Rings Style  9000
Nuclear GradeStyle 9001 Industrial Grade

Contact Our Experts for Premium Compression Packing Solutions

Mechanical packing reduces leakage from mechanical valves and pumps. Specific packing materials and styles are designed to meet specialized requirements.

Mercer Gasket & Shim manufactures mechanical packing and other key components for mission-critical applications. With over 100 years of experience, we fully operate in the United States and customize every product for our clients’ needs. We specialize in rush services and on-time delivery.

Contact us to learn more about our mechanical packing and other critical industrial supplies. If you’re ready to order mechanical packing for your project, request a quote today.