• Epoxy Bonding Problems on RoHS Boards

    epoxy bonding rohsIf you have seen problems with epoxy bonding components to RoHS circuit boards, you are not alone. This may be related to the surface energy of the board. Generally high surface energy is a good thing, while low surface energy is detrimental. The surface energy of the solder resist varies with the many types available. Oven curing the solder resist tends to lower the surface energy because the silicones are then forced to the surface during the curing process.

    It may be useful to perform a simple control test to investigate the surface energy of the boards. This can be done using dyne pens or a contact angle test. If you are using a dyne pen, 36 to 38 dynes is average. A no-clean, assembled board would be about 32 dynes, and you would not want to work with anything lower than this.

    To perform the contact angle test, measure the contact angle of a droplet to see how much the droplet beads up or wets out onto the surface. If when you perform the droplet test you find that the beads are quite round and do not wet this indicates low surface energy and poor bondability.

    From here you should conduct a suitable gas plasma treatment on some of the boards and see if this improves bondability and adhesion. You can bond actual parts to both the control and plasma treated boards to confirm any improvement in adhesion.

    If you are bonding to a metal surface, you should always first prep the surface with etch or alcohol. This will ensure the area is clean prior to any epoxy applications. GoKimco offers a complete lining of cleaning wipes to prep the area. Visit

    To find the best epoxy solution for your application shop GoKimco.

  • Make Easy Work of Bonding Jobs with Loctite 98413 UV Flood System

    There are plenty of ways to make sure that the bond, or seal, you placed upon a product or part during assembly stays. The best way, that we have seen through our own testing, is with the Loctite 98413 ZETA® 7411-S UV Flood System.

    This system is the ideal solution for smaller products and pieces that need to be sealed from any foreign particles gaining entrance. This is mostly seen in the electronics industry, but there are still other applications for hobbyists, mechanics, and other engineering fields where the Loctite 98413 is useful.

    The Loctite 98413 ZETA® 7411-S UV Flood System is designed exclusively for use in a wide range of bonding, potting, tacking, and sealing applications. It is a truly powerful system that can find a home in any environment. The 98413 ZETA is a medium intensity, bench top modular light cure system and includes a 4 inch, 400 Watt/inch UV metal halide lamp. This unit can accept multiple part sizes and has a typical curing area is 8 inches x 8 inches.

    This unit through Kimco also includes an operations manual, cotton gloves, UV metal halide lamp, and UV protection glasses.

    This powerful unit is essential for your next project, or for your assembly line. You can find the Loctite 98413 within our online catalog at at a special price that will not break your budget. Give your workers the exact tool they need to to the job right at a cost that will make it worth the investment. We also carry many other products from tools to safety gear all at low prices and fast shipping.

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