The cast iron components shall be coated internally and externally. Before applying the coatings, the surface shall be dry and free from rust or non-adhering products or foreign matter, e.g. oil, grease.
Points of contact inherent in the coating application systems are permitted.
These coatings shall not become sticky when they're subjected to temperatures which can reach 100℃. They shall maintain an acceptable appearance up to installation and permit the application of additional external finishing coatings.
The manufacturer shall specify the minimum factory applied thicknesses of the dry internal and external coatings on the finished products and shall demonstrate that these coatings conform to 4.6.2 or 4.6.3 respectively.