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The profiles/work pieces for PVC windows should have the zincified surfaces in the inner cavities to protect from corrosions preventing from bending that can result from deformations, mechanical shrinkages and tensions that can occur due to the climatic hot or cold changes and should be strengthened by fixing the metal core with the thickness not less than 1.2 mm without any defects and breaks. But, the events of replacing the metal cores by corroded irons that do not meet the standard requirements, those corroded irons are affixed only in the places where the hinges and door locks are installed, the plastic profiles/articles and metal cores are not connected with strengthening or installed far from each other, and made them of the weak and interrupted irons or irons with welded parts are breaching the technical and technological requirements.

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