"In soft soldering, metals are joined together using a solder at process temperatures below 450°C. To ensure that these joints are as stable and durable as possible, the surfaces of the metals to be soldered must be as clean as possible and free of oxides. The formation of oxides during the soldering process should also be avoided. To achieve this, we have developed a wide variety of products such as flux concentrates, ready-to-use fluxes, soldering lotions, oils, pastes and greases. This includes the newly introduced soldering and tinning pastes from the ZINNIN Green product group," explains Markus Gessner, Head of Marketing and Sales at Emil Otto GmbH. The ZINNIN Green pastes are used in the metalworking industry as well as in electronics production and are also suitable for tinning printed circuit boards. They are available in three variants with different alloys: ZINNIN Green I with the alloy Sn100, ZINNIN Green II with the alloy Sn96.5 Ag3.0 Cu0.5 (SAC305) and ZINNIN Green III with the alloy Sn97Cu3.
Before use, the paste must be stirred until the green colour of the usage indicator changes to metallic silver-grey. "This is absolutely essential to restore the paste to a usable state. Stirring can be done with a stainless steel or wooden spatula," continues Gessner. The paste is then applied to the parts to be treated using a brush or similar. In the case of overlapping parts or grooved pipe connections, the overlaps should also be lightly coated with the paste. "Due to the excellent activity of the flux contained, the ZINNIN GREEN pastes spread very well on the surfaces of the workpieces and penetrate perfectly into soldering gaps," says Gessner. If flux residues form after the soldering process, they can be removed with deionised water.
ZINNIN Green pastes can be used for both industrial and craft applications and are available in different packaging sizes.