If the surfaces that you
intend to adhere together are not prepared properly, the best adhesive in the
world will not hold them together. The major problems in adhesive delamination
is dirt and oil. Whenever possible, the surfaces to be adhered should be
abraded with sand paper or by sand or shot blasting before the adhesive is applied. Oil on the surface
of steel or even oil from fingerprints can ruin a bond. If the surface to be
bonded is painted, the bond of the paint to the substrate will be a limiting
factor in the overall bond quality. Plastic surfaces should be abraded and when
possible flame treated or corona treated to remove any plasticizer from the
surface and provide an oxygen rich surface environment for the adhesive.
Mixing:
- When hand mixing the epoxy resins and the hardeners,
- It is best to pour the resin, the Part A, into the mixing vessel first.
- Ratio A : B 1 : 1
- The product should be weighed to the nearest gram or to the nearest 0.5%, whichever is more precise.
- Next, the Part B is added using the same weighing procedure. Mix the two components using a stir stick.
- Mix the product for at least 3 minutes by the clock...scraping the sides and bottom of the mix vessel frequently. [Remember, it's just like baking a cake!]
- After the products have been thoroughly mixed, the mixture should be used in the adhesive step. Often, the end product must be totally free of voids and bubbles.
Setting And Curing Time.
Setting Time reaches 95% of its full cure within 24 hours, and 100% of its cure within 72 hours.
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