Delta Elite #788 from Qualitek is a water-soluble, halogen-free solder paste. As a low-volatility solvent system, it offers a 12-hour tack time, high slump resistance and high tack force. The paste extends stencil life over 4 hours. After processing, it is non-hygroscopic. The Delta Elite #691 is a no-clean solder paste with non-corrosive residue. It is Bellcore-compliant and offers 48 hours tack time. Stencil life is extended to 24 hours (9 months shelf life). Delta Elite #691 shows excellent wetting on OSP pads, and has wide profile tolerance and is solder-ball resistant. It prints up to 8-in/sec. This paste comes in two formulations: 691A with highly insulated post solder residue, and #691Q with a softer post-solder residue, and is pin-probe testable. ws
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