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synthetic solder paste

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Has anyone ever used synthetic solder paste?

Amtech http://www.solderandmore.com is selling a 35 gram syringe of lead free for $16.25 described as follows:

"The SynTECH series solder paste is a synthetic poly-adduct designed to exceed requirements for reliable solder joints in SMT PC board assemblies. This paste was formulated to replace traditional rosin/resin based no-clean formulations with more reliable synthetic materials. The residue is pin probable for ICT inspection. The SynTECH series does not require refrigeration if left at room temperature for 6 months and has a 12-month refrigerated shelf life. This formula is also available with a U.V. tracer for easier flux splatter inspection. (SynTECH-UV)"

Syntech SN63/PB37 35 gram Syringe

Any comments?
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