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Joncryl 631 is a high-hiding, Rheology Controlled (RC) acrylic emulsion for printing ink applications Applications Joncryl 631 is a hard, non-film forming, controlled particle size RC acrylic emulsion designed to hide the brown background of natural kraft substrates. This emulsion, when used as a letdown vehicle, results in more intense, brighter printed colors. The semi-opaque nature of Joncryl 631 allows for the reduction of pigment levels as well as inorganic extenders. Joncryl 631 is recommended for applications such as: • Printing inks for flexographic or gravure applications