Raw materials are as important as energy to chemical and process industries to provide chemicals essential to modern society and economics. Mass integration, taking place in mass exchange networks or MENs, comes as a significant concept to efficient use of raw materials. Such an integration leads to minimum waste disposal flows and minimum use of external mass separating agents' quantities. Several methods have been proposed to design mass exchange networks, including graphical and numerical solutions. This work develops a new graphical approach for the analysis of mass integration and exchange networks. The new method is graphical-based, and is valid for either existing mass networks or new networks design. The proposed method incorporates Pinch Analysis principles into a graphical representation of mass integration problem as composition of target materials in rich streams versus the equivalent corresponding compositions in lean streams. New graph representations are used to analyse the performance of existing MENs with respect to targets and to design new networks. Promising modifications to existing MENs can be identified to avoid violations to Pinch Analysis and thus improve actual performances for minimum wastes and external separating agents. In addition, new designs of MENs are obtained to achieve Mass Targets defined by Pinch Analysis principles. (C) 2015 Elsevier Ltd. All rights reserved,