Introduction
Electrically conductive adhesives are 1 and 2 component epoxy systems loaded with silver flakes that once cured, exhibit exceptional electrical and thermal conductivity. Initially designed as an alternative for high temperature soldering, these materials are used to fabricate electrical traces, bridge PCB components and as gaskets for EMI shielding. To learn more about MG Chemicals’ innovative Electrically Conductive Adhesives solutions, click here.
What Are Electrically Conductive Adhesives?
Electrically conductive adhesives are epoxy systems filled with highly conductive silver powder. These products were developed to cold solder components to PCBs when high temperatures could not be tolerated and have found more applications since like trace repair and EMI shielding. Once cured, these materials show conductivities ranging from about 150 to 2000 Siemens.
Key Properties:
- High electrical conductivity: sufficient to cold solder components and create electrical traces
- Adhesion: These materials bond to a wide range of substrates including plastics, metals, glass and composites
- Durability: Cure to form highly crosslinked polymer networks that withstand harsh chemical exposure
Top Applications of Electrically Conductive Adhesives in Electronics
- Cold solder for PCBs – Adheres components to PCBs at low temperatures
- Stenciling traces for PCB design – Can easily be squeegeed over stencils to fabricate conductive traces
- Die attachment on LEDs and semiconductors – Provides both strong adhesion and electrical conductivity
- Gasket fabrication for EMI shielding – Conforms to seams where radiation leaks can occur, mitigating EMI/RFI
Advantages of Electrically Conductive Adhesive Formulations
- Ambient Cure
- Low temperature curing for heat sensitive circuits that cannot withstand a reflow cycle
- Precise Dispensing
- Paste consistency allows for highly localized and precise application of material
- Durability
- Resistant to humidity and many chemicals, ideal for especially harsh environments
How to Apply Electrically Conductive Adhesives
- Surface Preparation
- Clean the surface thoroughly to remove dust, oils, or debris
- Some substrates such as polyolefins may require a primer to improve adhesion
- Preparation
- For 2-part systems, refer to the mix ratio listed in the product technical data sheet. Measure the components in the correct ratio and thoroughly mix for at least 2 minutes to ensure full mixing
- Curing
- Refer to product technical data sheet for cure schedules
Why Choose Electrically Conductive Adhesives?
- Low Temperature Cure
- Unlike solder, electrically conductive adhesives can be used in low temperatures for heat-sensitive components
- Adhesion
- Electrically conductive adhesives bond well to a wide variety of substrates including many plastics, metals, glass and composites
- Ruggedness
- Electrically conductive adhesives form a highly crosslinked network when polymerized, affording the material good resistance against common pollutants like chemicals and moisture
Tips for Optimal Results
- Ensure substrates are thoroughly cleaned to prevent material delamination
- Use the cure instructions in the technical data sheet to ensure the adhesive receives sufficient time at the right temperature
- Maintain proper storage of the adhesive to keep the adhesive stable
MG Chemicals’ Electrically Conductive Adhesives
MG Chemicals offers a range of electrically conductive adhesives to simplify applications where durable bonds are required.
- 9410 – a single-component, thixotropic adhesive with high electrical and thermal conductivity. The adhesive has a high glass transition temperature making it ideal for higher temperature applications. Its consistency allows for stable dot profiles and stenciling for trace fabrication or repair
- 8331D – a two-component adhesive with high electrical conductivity. The adhesive offers fast curing at room temperature and very good mechanical properties
- 8330D – a two-component adhesive with excellent electrical conductivity. The adhesive offers fast curing at room temperature and good mechanical properties
- 8331S – a two-component adhesive with high electrical conductivity. The adhesive offers a long working time and qualifies under the NASA standard for low outgassing
- 8330S – a two-component adhesive with excellent electrical conductivity. The adhesive offers a long working time and qualifies under the NASA standard for low outgassing
Why Choose MG Chemicals?
- Industry Leadership: With 70 years of experience, MG Chemicals is a trusted name in the electronics industry, specializing in high-quality chemical products
- Comprehensive Product Line: A wide range of adhesives designed to meet diverse application needs, from DIY projects to industrial solutions
- Global Availability: MG Chemicals products are distributed worldwide, ensuring easy access for customers across North America, Europe, Asia, and beyond
- Exceptional Support: Dedicated technical and customer service teams offer personalized assistance and expert guidance to ensure successful outcomes
- Commitment to Innovation: Continuous investment in research and development drives the creation of advanced, reliable solutions tailored to industry needs
Conclusion
Electrically conductive adhesives offer an alternative over soldering to adhere components to PCBs, avoiding the high temperatures that can compromise some circuits. Their high crosslink density ensures that bonds can withstand especially harsh environments without compromise.
Contact us today or visit our electrically conductive adhesives product page to learn more!
