Refers to the raw material required for metallic silver with copper or silver particles. The paste consists of 80-90% metal particles. The remaining proportions are made up of

• Solvents
• Thickening agents
• Fatty acids to prevent agglomeration
• Further additives to ensure the workability of the paste

The additives also determine the viscosity and thixotropy of the paste, which is crucial for processing, especially printing.

The metal particles can either be in spherical form or as flakes. Another option is the use of metal salts, that break down into metal particles during the sintering process. The particles are also used in different sizes. One speaks of nano-scale (1…100nm) and micro-scale (1…10µm). The shape and size of the metal powder has a decisive influence on printing and sintering. All variants offer advantages and disadvantages. Therefore, the composition of the paste or knowledge about it is of crucial importance.