Meridian Adhesives Group - The Science of Solutions

Important Considerations When Choosing an Electric Vehicle Epoxy Adhesive


Electric vehicle epoxy adhesive products are mainly used for electronic assemblies where batteries, motors, and power electronics need to be secured for electricity and power management.  They generally act as electrical insulators and thermal conductors to dissipate the heat of the power electronics. In addition, they also provide flammability resistance. 

Using the right product can help meet the challenges of safety, efficiency, durability, and cost optimization and enables you to fabricate high-performing components. 

There are crucial factors to consider when selecting an electric vehicle epoxy adhesive:

Selection Process

To select the best epoxy for your electronic vehicle adhesive, identify your regulatory requirements and thermal conductivity (ThK) intentions. Secondly, be sure to match your electronic vehicle adhesive properties to production or manufacturing process intentions and, finally, determine if the product meets your reliability requirements.

Regulatory Requirements

While vehicle electrification is a growing trend, the safety of energy storage components remains a significant concern for manufacturing engineers. This challenge is further heightened by various safety compliance standards, including REACH, RoHS, and UL 94.

REACH regulation standard governs the manufacture and use of electrical substances and evaluates the potential effects on human health and the environment. Substances of very high concern include Dibutyl Phthalate, 4,4’-isopropylidenephenol, 1-Methyl-2-pyrrolidone, and 4-Nonyl Phenol, branched and linear.

Compliance with RoHS is mandatory for manufacturers dealing with electrical and electronic equipment in China. In addition, RoHS regulations have threshold limits that control various substances or materials at the homogeneous material level.     

Various compounds should be minimized in electronic products used in electric vehicles. Both Epoxy Technology and our sister company, Epoxies, Etc. strive to eliminate harmful compounds from our product formulations to ensure they meet and exceed RoHS regulations.

UL 94 is a standard that classifies plastics based on how they burn in different orientations, from the lowest flame-retardant to the highest flame retardant. This standard helps epoxy formulators to include unique filler technology to ensure the vehicles and power electronics meet the ever-changing safety and performance needs.

Thermal Conductivity

Thermal conductivity means the amount of heat that must be removed from a device to optimize performance. The higher power density and power dissipation of improved state-of-the-art semiconductors create multiple interfaces through which heat flux must circulate. This includes the IC chip connected to the package, the PCB, to the heat sink, and, finally to the ambient surroundings.

Thermal Resistance vs. Thermal Resistivity

Thermal resistance is an object property and a temperature measurement between two points by which a material resists a heat flow. It is the ratio of the temperature gradient versus the power density and is expressed in units as degrees Celsius/Watt (C°/W). On the other hand, thermal resistivity is a material or object’s ability to resist a heat flow – and is often the opposite of conductivity. By definition, the lowest thermal resistance is the highest thermal conductor, ideal for high-power electronics.

Conductive epoxy is attained using thermal fillers. Theoretically speaking, in-device resistance can be similar to bulk resistance. However, Triple-layer adhesive test method is the best technique to measure the in-circuit and epoxy thermal performance.

Expoxies etc car body

Manufacturing/Process Considerations


The third step in the selection process is matching the adhesive to its intended manufacturing process. Factors like viscosity, pot life, handling, and curing need to be considered.  Improper curing of epoxy is a safety concern due to the possibility of a runaway exothermic reaction.

Exothermic Reaction

Epoxies are known for their versatility in their formulation chemistries.   However, not all chemistries enable large-scale potting and encapsulation.  An abundance of caution should be taken for any application using more than 50gm of epoxy in a component to prevent the generation of excessive heat, called a super-thermic reaction,  that could cause cracking, voiding, crazing, and high component stresses.

To avoid the possibility of a runaway exotherm, adjustments such as machinery deposition, adhesives specialty packaging, and stepped curing processes can be made.  Examples of adhesives specialty packaging include pre-mixed frozen syringes and Triggerbond® cartridges that both Epoxies, Etc. and Epoxy Technology offer.

Reliability and Life Cycle Intentions

Lastly, the final step in the selection process is determining the reliability of the components.  There is no simple answer in this regard. Instead, it is mandatory that the technical data sheets provide a first-level indication of performance; however, it is essential that all users determine whether the components can handle the harsh environments of the EV.  This includes meeting thermal cycles, moisture, salt and chemical resistance, and, especially vibration.

Why Does Stress Occur? 

Generally, stress happens due to temperature swings resulting from the curing process and from the operation of the EV itself.  When components cool, they shrink according to their coefficient of thermal expansion (CTE), which adds stress. Please note that the CTE of adhesive seldom matches the CTE of ceramics and metals. Most stress usually occurs in shear mode as opposed to tensile or compressive.

Contact Epoxies, Etc. Today for Assistance

If you are looking for electric vehicle epoxy adhesives, Meridian Adhesives Group’s Electronics Division members, Epoxy Technology and Epoxies, Etc., offer a wide range of electrically and thermally conductive adhesives to suit your specific application. Contact us today to schedule a consultation with our professionals or get a free sample.

Thermally Conductive 50-3150FR with Catalyst 12 Now UL 94V-0 Listed

The 50-3150FR with catalyst 12 has been a trusted high performance thermally conductive epoxy potting compound for decades. The 50-3150FR with catalyst 12 is UL 94V-0 listed (File Number E235584), which is a common flame retardant requirement for power electronics and automotive/electric vehicle applications..

With catalyst 12, this system has high thermal conductivity (2.16 W/m°K), a low viscosity (2,000 cps), and has a long pot life with a low exothermic reaction, making it ideal for large castings. Typical applications for the 50-3150FR include potting and encapsulating power supplies, transformers, electric motors, capacitors, batteries, coils, insulators, sensors, devices for intrinsic safety, etc. To download a technical bulletin, click here. To request a sample or a quote, click here or email


  • Low Viscosity
  • High Thermal Conductivity
  • UL 94V-0 Listed
  • Wide Operating Temperature
  • RoHS and REACH compliant
  • Low Exotherm
  • Low stress on electrical components
  • Long Pot Life

50-3253FR Offers High Thermal Conductivity, Meets UL 94V-0 Requirements

The 50-3253FR is a flame retardant thermally conductive potting and encapsulating compound. This easy to use, 1:1 mix ratio system has a wide operating temperature range (-65°C to 155°C) and is designed for applications requiring a flame retardant compound that exhibits excellent electrical insulation and high thermal conductivity.

The 50-3253FR is ideal in applications that require heat dissipation, and its low shrinkage makes it an excellent choice for encapsulating delicate components. It is formulated to meet the stringent non-burning requirements of UL 94V-0. Common applications include potting and encapsulating transformers, regulators, capacitors, battery, coil, motor, and power supplies. To request a sample, please follow this link or email To download a technical bulletin, click here.


  • Easy 1:1 Mix Ratio
  • High Thermal Conductivity
  • Meets UL 94V-0 Requirements
  • Wide Operating Temperature
  • RoHS and REACH compliant
  • Low Exotherm
  • Low Stress on Electrical Components

50-3116 Offers Unique Flexibility, Thermal Conductivity

The new 50-3116 is a flexible (Shore 80A), low viscosity, thermally conductive potting and encapsulating compound. This system has a wide operating temperature range (-70°C to 150°C) and is designed for applications requiring excellent electrical insulation and low stress during cure.

The 50-3116 is ideal in applications that require heat dissipation around delicate components. Its low exotherm and low viscosity make it a great choice for large pours. This formulation has a rubber consistency and retains its properties and flexibility for long term aging. Common applications include potting and encapsulating transformers, regulators, capacitors, battery, coil, motor, and power supplies. To request a sample, please follow this link or email To download a technical bulletin, click here.


  • Flexible, Shore 80A
  • Low Viscosity, Excellent Flow
  • Wide Operating Temperature
  • Thermally Conductive
  • RoHS and REACH compliant
  • Offered in kits for convenient purchasing and mixing
  • Low stress on electrical components

50-3141FR Offers a Fast-Curing, Flame Retardant Epoxy Adhesive

Epoxies, Etc.’s 50-3141FR is a toughened, two-component, fast curing thermally conductive epoxy adhesive that meets UL94 V-0 flame retardant requirements. 50-3141FR provides a unique combination of high lap shear strength, high peel resistance and impact endurance. The 2:1 mix ratio system sets in just 25 minutes at room temperature and develops a 2,000 psi lap shear strength in just 4 hours. The adhesive also offers higher heat performance than most fast setting epoxies. To request a sample of this product, click here or email Epoxies, Etc. sends samples in three days.

The 50-3141FR was specifically formulated for use in convenient TriggerBond Cartridges. To download a data sheet, click here. Other features include:

  • Meets UL 94V-0 requirements
  • Fast room temperature cure
  • Thermally Conductive
  • Forms strong bonds to a variety of substrates
  • Electrically Insulating
  • Vibration and impact resistant
  • Chemical and solvent resistant

COVID-19 Update

To our valued customers and partners,

At Meridian Adhesives Group, we recognize that businesses have been impacted by the ongoing effects of COVID-19. Our team has managed the needs of our customers and partners throughout the disruptions, and we are now positioned well to weather any recurrence. We would like to provide you with some continued assurances.

  1. We are fully operational. We’ve made accommodations in accordance with CDC recommendations. Employees are wearing masks and observing social distancing. But even under these conditions, we’re producing record amounts of adhesives, and shipments are leaving our manufacturing facilities every day.
  2. We are growing. While many are pulling back on production, we’re focused on the future. We plan to maintain our reputation as being leaders in the adhesives sector, and COVID will not alter our upward trajectory. We continue to expand in our market.
  3. We are innovating. Despite the setbacks of COVID, we’re investing in new product offerings. Our companies are launching new products and upgrading services to provide you with a comprehensive set of tools for getting the job done.
  4. We are here to support you. Our field sales specialists, technical advisors and support staff are available to provide assistance. They will, of course, observe local regulations and CDC recommendations to ensure the safety of your workforce, but if you need us, we’ll be there. At this time, all Meridian Adhesives Group manufacturing sites fall under the chemical manufacturingsector definition, and as such we will continue operations under the Cyber and Infrastructure Security Agency (CISA) guidance as for essential critical infrastructure work.

Our customers’ safety and success have always been, and will continue to be, our number one priority. We truly appreciate your business and intend to do all we can to support you during this crisis and long after it passes. Please stay safe and contact us if there’s anything we can do to help you and your teams.


Daniel Pelton, President
Meridian Adhesives Group

20-3305: Epoxy Potting Compound Formulated To Resist Thermal Shock and Cycling

The new 20-3305 is an easy to use epoxy formulated to handle critical, high voltage electronic requirements, and provides electronic assemblies protection from severe thermal cycling and shock. The 20-3305 exhibits excellent dielectric strength and volume resistivity, and can handle a wide range of temperatures.

This thermal shock epoxy is low in viscosity and therefore flows quickly around components.  20-3305 is typically cured at 120°C for 4 hours.

20-3305 epoxy system is a good choice for high temperature applications that require a material that is not rigid or brittle. To request a sample, please visit us at For a technical bulletin, click here.


– Toughness over a wide temperature range
– Thermal shock resistance
– RoHS and REACH compliant
– Easy to use mix ratio of 4:1 by weight

Optically Clear Epoxy Adhesive

Epoxies, Etc.’s new 10-3080 epoxy offers customers an ultra-clear adhesive and coating compound. The 10-3080 is formulated with proprietary materials which help prevent premature yellowing and degradation. The 10-3080 exhibits great adhesion, and its low viscosity makes it ideal for coating applications that require clarity.

The 10-3080 has a convenient 1:1 mix ratio by volume, and is offered in TriggerBond cartridges or in bulk. To request a sample of the 10-3080, please fill out the sample request form. Epoxies, Etc. makes and ships everything to order within 5 days of your order. Samples ship in three days.

Epoxies, Etc. & Epoxy Technology Announce Commercial Alignment

Meridian Adhesives Group FOR IMMEDIATE RELEASE Contact: Michael Harrington 401.946.5564

Epoxies, Etc. and Epoxy Technology, Inc. Announce Commercial Alignment

CRANSTON, Rhode Island (Mar. 9, 2020) – Epoxies, Etc. and Epoxy Technology, Inc., two established companies serving the electronics, automotive, medical, aerospace and industrial markets, recently announced a commercial alignment to offer more dynamic solutions to clients.

The partnership was implemented after the purchase of both companies by Meridian Adhesives Group, a platform in the global adhesives and sealants sector. Together, the companies will bring more products to design engineers working on demanding electronic and assembly bonding applications.

Epoxy Technology is a leader in microelectronic applications, with an emphasis on halogen-free epoxies, low outgassing materials, specialty UV curable systems and ISO 10993 bio-compatible adhesives. These products will compliment Epoxies, Etc.’s offering of potting and encapsulating compounds, UL 94 V-0 listed products and structural adhesives. Together, the companies will be able to supply printed circuit board level materials, such as underfill and glob top adhesives, all the way up to potting compounds that protect the entire electronic device. Both companies focus on convenience packaging options such as pre-mixed and frozen syringes and Triggerbond® cartridges for ease of use and quality.

“These two well-established companies have technical expertise and custom formulating capabilities that will drive innovation for the benefit of the markets they proudly serve,” said Michael Harrington, president of Epoxies, Etc. “Combined, we are able to offer more technical material solutions to both current and future customers.”

The electronics division of Meridian Adhesives Group provides high technology products with experienced technical support. Epoxy, urethane, silicone and UV materials that are manufactured by Epoxy Technology and Epoxies, Etc. have been used in some of the most demanding applications. Epoxy Technology, established in 1966, and Epoxies, Etc., established in 1988, are trusted partners of organizations throughout the world and will now be working together to provide more solutions to these clients.

“Strategically combining these two companies strengthens our approach in the market,” said Daniel Pelton, CEO of Meridian Adhesives Group. “We are providing our customers a broader product offering in the electronics and medical sector to meet their growing needs.”

Meridian Adhesives Group is a leading manufacturer of high-value adhesives and sealants technologies. Its portfolio of solutions includes high-performance specialty epoxy, polyurethane, hot melt and hybrid adhesives for the electronics, medical, construction and infrastructure markets. The company has operations in Dalton, GA; Fontana, CA; Billerica, MA; Pompano Beach, FL; Cranston, RI; and Columbus, OH. For more information, visit

COVID-19 Update

As COVID-19 continues to impact the global community, I want to personally update you on the steps we have taken to protect business continuity for all our customers. It goes without saying that, while ensuring the success of our customers is a primary focus, the health and safety of our employees, customers, partners and their families are paramount. 

Based on the guidance from the World Health Organization, we have reinforced our daily operations with specific steps to account for COVID-19.  

  1. We are closely following guidelines set by the CDC to mitigate risk to our employees and customers.
  2. We are advising against international travel at this time, and encouraging any necessary domestic travel be done responsibly.
  3. We have asked all employees to take recommended precautions to prevent exposing themselves to a possible infection and also to help stop the spread of the pandemic – any employee that has remote suspicion that they may be infected has been advised to remain at home and seek medical attention.
  4. We have instructed employees to leverage technology at our disposal and conduct internal and external meetings virtually as much as possible.
  5. We are working to move all internal and external events, such as marketing conferences, trainings, customer presentations, etc. to virtual platforms. Customers requiring in-person assistance will continue to receive it, as we realize our customers are also trying to continue servicing their own clients in the face of this temporary obstacle.

We appreciate your trust in our team, and we will continue to provide you with the level of support that you have come to expect. Your sales representative will be in communication with you as we work through this situation together.