The solder wires and solder pastes of the SJM series are the result of extensive development work by Almit research. The SJM series sets new standards in the strength of lead-free solder wire, which previously could only be achieved by using leaded solder wire. With five different alloys with different filler metals, there is a suitable solder wire or solder paste for every specific application.
Do you wish for an individual consultation? We are looking forward to hearing from you at technicalsupport@almit.de!
SJM = Strong Joint Metal (alloys with particularly high strength) All alloys of the SJM series are available as solder paste and solder wire Individual composition for every requirement
No cracking Perfect strength From 0.3% to 4% silver content Patented alloy Ideal for through-hole platingDue to steep rise of metal costs, examination of low silver Pb free solder is on the rise. Low silver SAC alloys have not been adapted to SMT assembly so far. Our SJM Solder especially improves thermal fatigue.
The Almit SJM Series is our lead free solder with improved thermal exhaustion resistance. The SJM products (available in solder paste and core solder) has extremely high heat-resistant fatigue properties. Especially when the soldered product is exposed to a strongly temperature changing environment, you won’t find any cracks or fatigue fracture.
These properties can be observed by a thermal shock test with a 1210 R Chip. We changed the temperature of the environment between -40°C and +125°C every 30 minutes. Our low silver SJM solder SJM-03 didn’t had any crack after 1000 cycles of temperature changing, while the standard SAC305 solder had huge cracks and fatigue fracture.
Another 500 cycles more, and the SAC305 product is nearly cracked completely while the SJM solder doesn’t have any crack at all after a total of 1500 clycles
1500 cycles from -40°C to +125°C
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1500 cycles from -40°C to +125°C
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1000 cycles from -40°C to +125°C
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1000 cycles from -40°C to +125°C
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Our high strength lead-free composition SJM-40 with bismut and antimony is even more powerful while our thermal shock test. Even after 2000 cylces of temperature changing, the SJM solder doesn’t show any crack while the SAC305 solder shows a complete subsidiary fracture.
| 1500 cycles | |
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| 2000 cycles | |
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| 1500 cycles | |
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| 2000 cycles | |
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