Garlock GRAPH-LOCK® 3125TC | Reinforced graphite gasket

Reinforced graphite gasket

• Excellent resistance.
• Pure exfoliated graphite flake material excels in extreme conditions, withstanding heat, pressure, and aggressive chemicals.
• Proven fire-safe.
• Retains dimensional stability in high temperatures; seals tightly even during pressure fluctuations.

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What is Garlock GRAPH-LOCK® 3125TC

Garlock GRAPH-LOCK® 3125TC is a sheet material for industrial gaskets made of purified natural graphite with a 316 stainless steel tang insert. The graphite is expanded at high temperature and then compressed into sheets with a minimum graphite content of 98%, while the metal reinforcement improves handling and material stability during cutting, installation, and operation.

Material composition and structure

Garlock Graph-Lock 3125TC is composed of:

  • high-purity purified natural graphite
  • minimum graphite content of 98%
  • 316 stainless steel tang insert
  • black color

The metal reinforcement overcomes one of the typical limitations of pure graphite sheets, namely fragility during handling.

Recommended industrial applications

Garlock Graph-Lock 3125TC is suitable for flanges and industrial equipment operating under:

  • high temperatures
  • thermal cycling conditions
  • fluids compatible with graphite
  • the need for excellent conformability to sealing surfaces

Garlock GRAPH-LOCK® 3125TC and General Packing technical support

General Packing Italy is an authorized Garlock distributor and stocks the complete Garlock product range, including GRAPH-LOCK materials. The company also provides pre- and post-sales technical support, which is essential when selecting the correct gasket thickness, material compatibility, and configuration.

Datasheet

Datasheet download

Applications

  • refineries
  • petrochemical plants
  • thermal power plants
  • chemical plants
  • paper mills
  • water treatment plants
  • engineering and plant maintenance companies

Technical FAQ

What is Garlock Graph-Lock 3125TC?
It is a high-purity graphite gasket sheet with a 316 stainless steel tang insert, designed for the manufacture of flat gaskets for high-temperature industrial applications.

What is the maximum temperature of Garlock Graph-Lock 3125TC?
The maximum continuous temperature stated in the technical data sheet is +454 °C, with a minimum temperature of -240 °C.

What are the advantages of a reinforced graphite gasket?
It offers good thermal resistance, excellent conformability to sealing surfaces, stability in service, and easier handling compared to an unreinforced graphite sheet. General Packing’s technical notes also highlight that the reinforcement helps overcome the typical fragility of pure graphite during handling.

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