New soldering and tinning pastes for soft soldering

These sustainable pastes do not contain zinc chloride, are not subject to hazard labelling, and can be used for soft soldering and tinning. They are particularly suitable for processing steel, brass, and copper alloys, and can also be used in the electronics industry.

Markus Gessner, Head of Marketing and Sales at Emil Otto GmbH, explains: “During 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. In order 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.”

The ZINNIN Green pastes are used in the metalworking industry and 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.

Gessner continues: “This is absolutely essential to return the paste to a usable state. Stirring can be done with a stainless steel or wooden spatula.”

The paste is then applied to the parts to be treated using a brush or similar tool. For overlapping parts or grooved pipe connections, the overlaps should also be lightly coated with the paste.

Gessner adds: “Due to the excellent activity of the contained flux, ZINNIN GREEN III spreads very well on the surfaces of the workpieces and penetrates perfectly into soldering gaps.”

If flux residues are formed after the soldering process, they can be removed with deionized water.

ZINNIN Green pastes are suitable for both industrial and craft applications and are available in various packaging sizes.