Pigments and extenders. Methods of dispersion and assessment of dispersibility in plastics - Determination by film test1 Scope This part of ISO 23900 specifies a method assessing the degree of dispersion of colorants1 and or extenders in a thermoplastic polymer. The method is suitable for testing colorants and or extenders in the form of concentrates or compounds in all polymers used for extrusion processes. NOTE Defects such as gels, black specks, holes in the test film are not in the scope of this part of ISO 23900. The film test result determined according to this

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– contain limit values or procedures for verifying compliance with regulatory requirements