5.5.5 Priming of plastics2019-05-03T12:47:16+02:00

5.5.5 Priming of plastics

Objective:

The primer primarily promotes adhesion between the substrate surface and the adhesive, namely it acts as an adapter between the surface and adhesive.

Suitability:

Priming is in principle suitable for all plastics.

Procedure:

  • The substrate surfaces must always be thoroughly cleaned and degreased; if necessary other surface treatment processes must be carried out
  • Apply the primer evenly in a thin layer using a sponge, following the instructions of the manufacturer (thick layers weaken the adhesive bond)
  • It must be ensured that the primer is suitable for both the substrate material/surface and the adhesive
  • Heed the airing time (evaporation time); then apply the adhesive within the open time

Points to heed:

  • The substrate surfaces must always be thoroughly cleaned and degreased and if necessary other surface treatment processes must be carried out
  • Mix the primer before use
  • Apply a thin, even layer
  • Heed the airing time
  • Heed the open time
  • Close the container immediately after removing primer
  • Note the date of opening on the container
  • Primers must be used within a limited time after the first opening of the container
  • Be aware of the risk of stress cracking