OEM

UL 1203 Certified Epoxy for Explosion-Proof & Dust-Ignition-Proof Electrical Equipment

Master Bond EP41S-6 is a new two component epoxy system that meets UL 1203, which is defined by Underwriters Laboratories as the “Standard for Explosion-Proof and Dust-Ignition-Proof Electrical Equipment for Use in Hazardous (Classified) Locations”. To meet the UL 1203 requirements, samples of EP41S-6 were exposed to saturated vapors in air for the following chemicals: acetic acid (glacial), acetone, ammonium hydroxide (20% by weight), ASTM reference fuel C, diethyl ether, ethyl acetate, ethylene dichloride, furfural, n-hexane, methyl ethyl ketone, methanol, 2-nitropropane, and toluene. After 168 hours of exposure to these vapors, sample castings in groups of 6 were observed for discoloration, swelling, shrinking, crazing, cracking, leaching, and dissolving. The samples were also subjected to a crush test before and after exposure to these chemicals. The crushing force for EP41S-6 was not less than 85% of the original value. EP41S-6 has successfully met or exceeded the requirements of these tests.

EP41S-6 can be used in potentially explosive environments, as defined in National Electrical Code, NFPA 70 (National Fire Protection Association). In fact, EP41S-6 is suitable for use not only in Class I, Division 1 Groups A, B, C and D but also in Class II, Division 1, Groups E, F and G.
Class I, Division 1 Groups A, B, C and D include flammable or hazardous conditions that can exist under normal operation conditions for acetylene, hydrogen, ethylene and propane. Class II, Division 1 includes combustible dusts, with Groups E, F and G covering metal dusts, carbonaceous dusts and non-conductive dusts respectively.

EP41S-6 is a thermally stable compound possessing a glass transition temperature of 145-150°C and serviceability from -80°F to +500°F [-62°C to +260°C]. It offers a high dielectric strength of 440 volts/mil at 75°F for a 0.125 inch thickness. The optimal cure schedule for EP41S-6 is overnight at room temperature, followed by 6-8 hours of heat curing at 150-250°F. With a mixed viscosity of 30,000-40,000 cps at 75°F, this compound features good flow properties making it ideal for sealing and potting applications for electrical feedthroughs across various industries.

How to Start Using a New Epoxy in a Bonding Application

Trying a new epoxy is exciting and challenging, and we would like to share a few thoughts on this subject. Often, there is a tendency to “get right to it” and start the bonding process as soon as possible. In many cases, this may not be a good way to move forward. Epoxies can be tenacious and difficult to remove if something goes wrong.

Potting and Encapsulation Compounds for Batteries

Adhesive, sealant and coating compounds for Many Master Bond potting and encapsulation systems offer long term durable protection from moisture, vibration, mechanical shock, chemicals to maximize performance for different sized/shaped alkaline and lithium batteries.

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Marine Electronics

Epoxy compounds are used for marine electronic assembliesMaster Bond formulates a broad line of epoxy compounds specifically designed to provide protection for electronic devices in marine environments.

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High Elongation, Two Component Epoxy System with Excellent Thermal Shock Resistance

Master Bond EP110F8-3 is a two part epoxy system ideal for sealing, encapsulating, potting, and casting applications. “This toughened system provides very good flexibility and possesses a relatively high elongation of 120-150%”, says Rohit Ramnath, Senior Product Engineer. “It offers a low tensile modulus of around 5,000-15,000 psi and a shore A hardness of 40-50 at room temperature.”

EP110F8-3 features excellent thermal cycling and shock resistance, passing 10 cycles from -55°C to +125°C with no signs of cracking. It has a superior electrical insulation profile with a low dielectric constant of 2.67 as well as a low dissipation factor of 0.006, both measured at 75°F for 1 KHz.

EP110F8-3 has a convenient mix ratio of one to two by weight; the color of Part A is clear while the color of Part B is amber. It has a low mixed viscosity of 1,000-2,000 cps and flows readily. Working life for a 100 gram batch is 2-3 days at room temperature and can be cured within a few hours at 250-300°F.

High Tensile Strength Epoxy Adhesive Utilizes Renewable Biomaterial

Master Bond EP70CN is a two part, thermally stable epoxy adhesive formulated using a natural, renewable and sustainable ingredient. This epoxy system forms high physical strength bonds and can be utilized for bonding, sealing, coating and potting. “The tensile strength is 11,000 to 12,000 psi and the tensile modulus, 300,000 to 350,000 psi. It features a glass transition temperature of 130 to 135°C”, says Rohit Ramnath, Senior Product Engineer. “The EP70CN has a very good chemical resistance profile when cured at the optimal cure schedule.”

It is a low viscosity formulation with a mixed viscosity of 2,500 to 5,000 cps. With a long working life of 60 to 90 minutes and a variety of curing options, the optimal cure schedule is overnight at room temperature followed by 3-4 hours at 140°F to 170°F. EP70CN bonds well to a wide variety of substrates including metals, ceramics and many rubbers, plastic materials, and especially composites with low shrinkage upon cure. It features excellent wetting properties which makes it suitable for applications involving bonding and sealing fibers. EP70CN has a high volume resistivity (greater than 1014 ohm-cm) and a relatively low exotherm. This combination of properties enables it to be used in many encapsulating applications.

EP70CN can be used in aerospace, electronic, opto-electronic and OEM applications, particularly those involving composites and fibers. In addition to specialty packaging in the form of premixed & frozen syringes and FlexiPaks®, EP70CN is available in standard packaging of ½ pint, pint, quart and gallon kits.

Epoxy Lining Technology for Corrosion Protection of Process Vessels

Adhesives, Sealants and Coatings for Vessel Linings Master Bond novel solvent free epoxy process vessel lining systems can be hand applied or sprayed. They are used on different sized cyclinders, cone, spherical shaped vessels.

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Two Part Epoxy Adhesive for Structural Bonding Features Long Pot Life

Master Bond EP21ND-LP was created for structural bonding applications involving large surface areas. It has an advantageously long working life of 2-4 hours at 75°F for a 100 gram mass. Its smooth paste consistency makes it convenient to apply and use. Shore D hardness is 70-80 when mixed in a one to one mix ratio by weight or volume. Moreover, certain properties of the epoxy can be altered by adjusting the mix ratio. For example, adding more of Part A to obtain a 2:1 mix ratio will produce a formulation with a more rigid cure. Conversely, adding more of Part B in a 1:2 mix ratio will provide the epoxy with a more forgiving cure. EP21ND-LP cures at room temperature or more rapidly at elevated temperatures.

EP21ND-LP achieves high strength, durable bonds and has excellent gap filling properties. Its tensile strength ranges between 6,000 to 7,000 psi. It withstands thermal cycling and has a coefficient of thermal expansion of 50-55 x 10-6/in/in/°C. This dimensionally stable epoxy also offers reliable electrical insulation with a volume resistivity greater than 1014 ohm-cm.

The standard color of Part A is gray and Part B amber, although the epoxy can be formulated in a wide array of colors. It can be used in the electronic, electrical, computer, appliance, chemical, aerospace and specialty OEM industries. It is available in ½ pint, pint, quart and gallon kits.

Epoxy Features Very Low Coefficient of Thermal Expansion

Master Bond EP30LTE-2 has been developed for joining dissimilar substrates exposed to thermally or mechanically induced stresses. It can be used for sealing, coating and encapsulating, especially for small to medium sized castings where a very low coefficient of thermal expansion (CTE) is required.

EP30LTE-2 is a highly dimensionally stable epoxy system with low linear and volumetric shrinkage upon curing. The compressive strength of the cured material is 24,000-26,000 psi and its CTE is very low at 10-13 x 10-6/in/in/°C. It is a reliable electrical insulator featuring volume resistivity of more than 1015 ohm-cm. EP30LTE-2 meets NASA low outgassing specifications and features a combination of physical properties making it ideal for applications in aerospace, optical, electronic and specialty OEM industries where these requirements are critical.

EP30LTE-2 is a two part epoxy which obtains optimal properties when cured overnight at room temperature followed by a heat cure for 2-4 hours at 150-200°F. This system offers moderate flow characteristics with a mixed viscosity ranging from 70,000 to 100,000 cps. In addition to standard packaging units of ½ pint, pint, quart, gallon and 5 gallon kits, the epoxy is available in premixed and frozen syringes.

Toughened Two Part Epoxy Withstands Repeated Thermal Cycling

Master Bond Inc. has developed a solvent free, two component, toughened epoxy system called Supreme 62-1. It is serviceable from -60°F to +450°F (-51°C to +232°C). Most noteworthy, Supreme 62-1 provides chemical resistance to a wide range of acids, bases, fuels and solvents even at elevated temperatures. It can be used as an adhesive/sealant for aerospace, electronic, optical and specialty OEM applications.

“Master Bond Supreme 62-1 has superior toughness, which makes it suitable for bonding substrates with different coefficients of thermal expansion and allows it to resist repeated thermal cycling”, says Rohit Ramnath, senior product engineer. “This formulation also exhibits a tensile strength of 8,000-9,000 psi and a tensile modulus of 450,000-500,000 psi. Based on its combination of thermal stability and high physical strength profile we can recommend Supreme 62-1 for many applications requiring structural bonding of dissimilar substrates.”

Supreme 62-1 is easy to use and has an advantageous long working life of more than 12 hours after mixing a 100 gram batch. Typical cure schedule options range from 4-6 hours at 140-158°F (60-70°C) to 20-40 minutes at 176-212 °F (80-100°C) to 10-20 minutes at 257°F(125°C). This compound has an elongation of 5-10% and a Shore D hardness of 75-85. Volume resistivity of the cured epoxy exceeds 1014 ohm-cm. Supreme 62-1 is available for purchase in ½ pint, pint, quart, gallon and 5 gallon kits. Specialty packaging in premixed and frozen syringes and in gun kits are available to simplify handling, minimize waste, speed productivity.

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