SJM – lead-free with perfect strength

    Lead-free soldering wire with the same characteristics as wire containing lead cannot be possible?
    Get to know our SJM series and discover an alloy with perfect strength.

    An Innovative Solution

    The soldering pastes and soldering wires in the SJM series are the results of extensive development work by the Almit research department. Whilst general lead-free alloys used up until now already begin to show cracks after 500 cycles, the patented SJM 03 for example even remains intact after 1,500 cycles and shows no cracks whatsoever.

    With perfect strength

    The SJM series delivers a new dimension in strength to lead-free alloys. And so the initial strength of SJM 03 compared to the usual SAC 305 alloy used shows an improvement of 6%.

    The added metals and their advantages

    • Bi (bismuth) increases the tensile strength and resistance to tearing, increases the long-term reliability.
    • Fe (iron) minimises wear on the soldering tip
    • Sb (antimony) ensures even better long-term reliability
    • Ga (gallium): prevents oxidisation

    The strength after 2,000 cycles can even be up to 33% higher. Even for a still higher strength there is an optimum solution:

    SJM series lead-free alloys:
    Silver content from 0.3% up to 4%.

    Ideal with through–hole contacts

    Characteristic for the SJM series alloys are the superlative wetting and working characteristics (RMA compliant). In this way they are ideally suited for soldering on through-hole circuit boards.

    sjm series

    SJM series – ideal for through–hole circuit boards

    The advantages of the SJM series at a glance

    • lead-free
    • no crack formation
    • perfect strength
    • a silver content of from 0.3% to 4%
    • patented alloy
    • ideal for through-hole soldering

    What does SJM stand for?

    "SJM" stands for high-strength alloys with particularly high strength. There is no crack formation when the solder joint hardens.

    "SJM" steht für hochfeste Legierungen mit besonders hoher Festigkeit. Es kommt zu keiner Rissbildung bei der Aushärtung der Lötstelle.

    srs ram nc

    We tested SRS RMA-Nc SJM with conventional soldering wires. With a clear winner.

    The winner of the test for fl ux splashes

    Test method: Spot soldering onto a copper plate using a soldering robot. The copper plate lies on thermo-paper, count of fl ux splashes on the thermo-paper.

    almit sjm series

    Quicker is better

    The test shows that you have a faster speed of wetting with the SJM series soldering wires.

    almit sjm series

    SJM-03 is the winner of the test for strength & price

    SJM 03 is convincing: higher strength and lower price than the standard alloy.

    Test methode: from -40°C to + 85°C with a 30 minute holding time on a 1206 structural element.

    almit sjm series

    SJM-40 – the muscle packet of the SJM series

    SJM-40 even fulfi ls the highest demands. Along with bismuth and antimony it contains a higher silver content and guarantees high performance in long-term reliability. Even with very high temperature changes SJM retains its perfect strength.

    right arrow high strength
    right arrow contains bismuth and antimony
    right arrow high silver content
    right arrow particularly reliable