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M40 solder pastes are low silver for reduced cost lead-free soldering. Is said to maintain workability of higher silver pastes and overcome reduction in thermal fatigure resistance. Is said to prevent tombstoning and limit solder surface glare. Solidus temperature is 211C, peak temperature is 222C. Is a SnAg1.0Cu0.7Bi1.6 alloy. Halogen-free version available.

Senju Metal, www.senju-m.co.jp/en/product/ecosolder/halogenfree/index.html

 

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