ISO 4534:2010 specifies a comparative method of determining the fluidity behaviour of vitreous and porcelain enamels in the viscous condition during firing. It is not intended for use as an absolute method.
DS/EN ISO 4534:2011 history
2011DS/EN ISO 4534:2011 Vitreous and porcelain enamels - Determination of fluidity behaviour - Fusion flow test