DIN Standards Committee Coatings and Coating Materials
DIN 55655-5
Paints and varnishes - Electro-deposition paints - Part 5: Determination of sieve residue
Beschichtungsstoffe - Elektrotauchlacke - Teil 5: Bestimmung des Siebrückstandes
Overview
Electro-deposition coating materials are exposed to different stability stresses, such as temperature differences, shear stress and different deposition conditions. All of these influences, together or individually, can lead to instability of the dispersion. Coagulation and kick out of the electro-deposition paint can occur. This, in turn, can result in sedimentation inside the tank and/or on surfaces to be coated, as well as in clogging of the filters and other similar plant-specific problems. With this test method, the alteration of the stability level of electro-deposition coating materials can be integrally detected. This part of DIN 55655 specifies a method for the determination of soiling material, such as from previous processes, non-dispersed paint particles and other foreign material in the electro-deposition coating material. In practice, increased sieve residue can have different causes, such as metal particles, which are introduced together with the object to be coated, or clots caused by poor dispersion. This standard has been prepared by Working Group NA 002-00-07-09 AK "Automobilbeschichtungen" ("Automotive coatings") of Working Committee NA 002-00-07 AA "Allgemeine Prüfverfahren für Beschichtungsstoffe und Beschichtungen" ("General test methods for coating materials and coatings") at DIN Standards Committee Coatings and Coating Materials (NAB).
