How do Epoxies Work?

by Andy on October 1, 2012

Double Bubble EpoxyEpoxies are very strong adhesives, used to bond two objects when normal glue will not work. Typical epoxies contain a resin and a hardener, which are inert on their own. Once you mix the resin and hardener they will start to become rigid, creating a tough bond between two objects.

Depending on the chemical make-up and the ambient temperature, the curing process can take from 5 minutes up to multiple hours. This allows you to select the epoxy with as long of a work-life as you need, so it will set fast or a longer period of malleability.

Many epoxies come in special syringe containers that allow for exact mixture ratios. These syringes can have plungers of different sizes to make it easy to get a 1:1, 2:1, or higher mix ratio for the most effective bond. Disposable mix nozzles are also available to automatically mix the epoxy as it comes out of the syringe.

Other epoxies that do not need exact mix ratios may come in small dual-pouch packets that can be cut open, squeezed out, and then mixed together to cure. This can also be useful if you do not need a large amount of epoxy, as once you use part of a syringe the rest of it will go bad faster than when it is sealed.

Have any more questions about epoxies and how they work? Leave a comment below!


CircuitMedic PCB Repair Practice Kit

CircuitMedic PCB Repair Practice Kit

CircuitMedic is another new vendor for All-Spec, and their products are a first for us. CircuitMedic provides both tools and materials such as circuit frames, micro pad kits and micro drills for printed circuit board repair. The materials and tools in CircuitMedic’s kits have been used by medical, military and commercial eletronics manufacturers for years.

Becoming certified to repair PCBs? The CircuitMedic Repair Skills Practice Kit is a great tool to practice repair skills on a circuit board with a variety of real-life defects. All the materials needed including replacement conductors come with the kit.

Included in the kit:

  • 1 defective circuit board
  • 2 varieties circuit frames
  • 1 circuit track, .002″ x .010″
  • 1 circuit track, .005″ x .020″
  • 1 color agent, PMS 348
  • 2 epoxies
  • 50 flat flange eyelets, .030″ ID x .093″ length
  • 50 flat flange eyelets, .036″ ID x .092″ length
  • 2 foam swabs
  • 2 mixing sticks
  • 2 plastic cups
  • 2 plastic probes
  • 1 Kapton tape
  • The damaged circuit board included in the kit has the following defects, damaged base board, damaged conductors, damaged lands, damaged surface mount pads, damaged edge contacts and damaged plated holes.

    If you don’t need the practice kit, I recommend the CircuitMedic professional circuit board repair kit. This complete kit keeps all necessary repair tools and materials in a convenient case.