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‘Fine Pitch’ and ‘High speed printing’ are relative terms but many solder paste users see capability in meeting these two requirements as their major goals for process improvements. Not surprisingly, solder paste rheology governs both, and this paper describes how the complex relationship between resins and solvent can lead to solder pastes with optimised performance. Work on the physical behaviour of resin solutions and how this relates to solder paste rheology is reported. These results are related to user experience on volume production processes.

The rheological properties of a coating are important determinants of storage, application and flow characteristics and, as such, the need for its accurate measurement is an important requirement in formulation development. Measurement of rheology is also an important phase of quality control testing, though frequently less sophisticated, more rapid, characterisation techniques may sometimes be used here. This article will consider some of the literature concerned with techniques of measuring coating rheology.

Discusses the various methods that are used for measuring the viscosity of paints and inks in the laboratory environment and suggests what equipment is most suitable for different applications. Identifies the most common sources of errors in making measurements and emphasizes the importance of calibration in obtaining accurate and reproducible results.