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Kester's No-Clean, Pb-free Solder Paste

Published: 27 September 2005
 by Mike Buetow
EnviroMark 907 (EM907) is a no-clean, lead-free solder paste. Designed for high-yield, lead-free manufacturing, was engineered specifically for the higher thermal demands and higher melting temperature lead-free alloys, such as the SnAgCu (SAC) alloys. Features a long stencil life, offers lead-free joints that closely resemble those achieved with Sn/Pb solder paste. Capable of extended downtimes in printing, maintains excellent print quality at print speeds up to 6 in/sec. (150 mm/sec). Has excellent cold and hot slump behavior, preventing bridges and solder ball formation. Said to have excellent solderability to a variety of board surface metallizations, including OSP, Ni/Au, Immersion Sn and Immersion Ag. Features solderability to an array of component metallizations, including Pd/Ag and Alloy 42. Flux chemistry offers bright solder joints, even in air reflow. This cosmetic feature is an added benefit during inspection. The paste leaves only a light-colored residue and provides a stable tack life. 

Reflowable in air or nitrogen, prints down to 0201 pad sites, has superior printing characteristics to 16 and 20 mil pitches (0.4 and 0.5 mm) and meets J-STD-004 Flux Classification ROL0.
 
Kester, kester.com, Booth 5636

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