Graphite Filled Electrically Conductive Adhesives - Advanced Solutions

Master Bond offers a variety of graphite filled, electrically conductive adhesives, sealants, and coatings. Graphite filled compounds are used in applications that require a nonmagnetic adhesive with high lubricity, and are well suited for shielding and static dissipation.

In addition, graphite filled adhesives offer a cost effective alternative to silver filled epoxy systems. Graphite filled formulations are ideal for use where metal additives are not desirable. Master Bond offers a number of room temperature curing and low elevated temperature curing, electrically conductive systems for applications where heat sensitive components must be bonded to circuit boards and other assemblies or for repair of circuitry.

Major Applications

Graphite filled compounds are used for their nonmagnetic properties and their cost effectiveness. Common applications of Master Bond’s graphite filled conductive adhesives include:

  • Electrical modules
  • PCBs
  • High frequency shields
  • Wave guides
  • EMI/RFI shielding
  • Entertainment systems
  • Specialty heat sinks
  • Interconnection repair
  • Digital signal processors
  • Solar cell manufacturing
  • Electrical ground plane interface
  • RFID tagging
  • Printed wiring board applications
  • LED packaging
  • Wireless headsets
  • Wafer lamination
  • Stack bonding
  • Copper/polymide (PI) circuits
  • Integrated circuitry
  • Flip chip packaging
  • Thermistors
  • Microprocessors
  • Stress control devices
  • Wire tacking
  • SMD attachment
  • Hermetic lid-seal processes
  • Communication systems
  • Electronic test equipment
  • Hybrid packaging
  • Membrane switches
  • Antenna assemblies

High Reliability and Performance

Master Bond's graphite filled electrically conductive products are designed to offer superior quality and long term durability. They have earned a well deserved reputation for their performance upon exposure to hostile environmental conditions. Select from a wide range of systems conveniently packaged for ease of use. These compounds are available in different viscosities, cure times, chemical resistances, electrical properties, colors, etc. to best meet specific requirements. They are presently employed in applications ranging from design and production to repair, maintenance and field service.

Key Characteristics

The key characteristics of graphite filled electrically conductive adhesives include:

  • Superior durability in hostile environments
  • Excellent adhesion to Similar and dissimilar substrates
  • Uniform electrical conductivity
  • Low/high temperature resistance
  • Easy application
  • Static dissipation
  • Chemically resistant
  • Dimensional stability
  • Peel strength
  • Volume resistivity
  • Compressive strength

Popular Electrically Conductive Graphite Polymer Systems

The popular electrically conductive graphite polymer systems are tabulated as:

EP75-1 Graphite-filled epoxy adhesive/sealant for use in specialty applications as well as EMI/RFI shielding where a non- metallic filler is required. Superb resistance to moisture and chemicals. Exceptional durability.
MASTERSIL 155 Two component, graphite filled electrically conductive silicone compound. Cures to a tough, flexible black rubber. Superior resistance to vibration and shock. Service temperature range of -85°F to +400°F.
X5G Cost effective, one component graphite conductive elastomer adhesive, sealant and coating for EMl/RFI shielding. Superior shielding over a wide frequency range and excellent environmental resistance.

Master Bond Polymer System EP75-1

Master Bond Polymer System EP75-1 is a two component, graphite filled, electrically conductive epoxy for high performance bonding, sealing and coating formulated to cure at room temperature or more rapidly at elevated temperatures. The mix ratio of the EP75-1 system is 100 to 15 by weight. It readily develops a high bonding strength of more than 1500 psi tensile shear. The volume resistivity of the cured system is 50 to 100 ohm-cm. Since EP75-1 is graphite filled, the system also features nonmagnetic properties as well as high lubricity. EP75-1 contains no solvents or diluents.

Master Bond Polymer System EP75-1 can be applied with minimal sagging or dripping even on vertical surfaces, although it can be made thinner by adding 5 to 10% by weight of an appropriate solvent such as xylene, acetone or MEK. The high strength bonds are remarkably adaptable to thermal cycling and resistant to chemicals including water, oils, acids and bases. The temperature range is -60°F to +250°F. Adhesion to metals, glass, ceramics, vulcanized rubbers and many plastics is excellent. Master Bond EP75-1 adhesive is widely used in the electronic, electrical, computer, semiconductor, microwave, appliance and automotive industries, among others. It is particularly useful in applications where the conductive adhesive should not have any magnetic properties or in applications where good lubricity is needed.

Packaging

Master Bond's electrically conductive products consist of one and two part epoxies. They are conveniently packaged for ease of use. They are available in syringes, jars, bubble packs, cartridges, etc. Two component systems can be purchased in premixed, frozen syringes. Freshly prepared to maximize shelf life, Master Bond electrically conductive compounds can be bought in quantities from grams to gallons.

This information has been sourced, reviewed and adapted from materials provided by Master Bond Inc.

For more information on this source, please visit Master Bond Inc.

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