Joined in 2023 
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63 About this deal
I just looked that up because I haven't heard of the Alpha brand before. It turns out that this is a solder paste The Chip Quik SMD291 is okay and is more readily available from reputable dealers than the Amtech outside of the US. Refrigeration is not necessary and will not extend product shelf life. If the material has been refrigerated - consider 3-4 hours to normalize at room temperature.
Flux is what allows solder to flow. If you've created a bridge, need to solder a jumper in a small area, or are reflowing a chip to try and remove corrosion - good flux will make your life easier. https://www.banggood.com/2pcs-AMTECH-NC-559-ASM-PCB-BGA-Reballing-Solder-Flux-Paste-10CC-p-960102.html I spent almost a whole day looking through different offers now (wasted would be a more appropriate expression), so I'm now turning to you and would kindly ask about some recommendations. Amtech flux is sold from Deep River, Connecticut and made in the USA. So STOP BUYING IT FROM ASIA!!Optimal viscosity - 40-52 (Malcom @ 10 RPM/25°C (x103mPa/s)). High temperature compatible (up to 300°C/600°F). Surface insulation resistant. No copper mirror breakthrough. Low electrochemical migration (< 1-decade drop). May contain up to 7% w/w of ethoxylated 4-nonylphenol (NPE can be harmful to aquatic organisms - dispose of responsibly avoiding water drains)
I'm now wondering if the solder paste I received is authentic or not. Just watched this video and from it I got that AMTECH separated from Inventec. Is this for real? Including plunger, metal blunt dispensing tip, and "Genuine Product" AMTECH soldering profiles card NC-560-LF-TF can be left on the board for many SMT assemblies. For applications requiring cleaning, NC-560-LF-TF can be cleaned using commercially available flux residue removers. When it comes to soldering Sn60/Sn62/Sn63 leaded MT alloys using Hot Air station the V2 formulation would be one of the first choices for the handcraft/hobby/rework - V2 chemistry instantly wets Sn/Pb MT alloys but most importantly it has sufficient body to withstand rework with Hot Air station for extended period of time. I just got RMA-223-TF flux from https://amtechdirect.com/ and tried it out on a small kit. It's pretty difficult to clean up. I tried to clean it with isopropyl alcohol.
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HydraCoat-UV 2% - Conformal nano-coating 2% polymer UV-traceable - Ultra-Thin Conformal Nano-Coating - Industrial Strength Silicone, Acrylic, Glass, Metal, Ceramic Coating - Fast-Drying - Easy To Apply in Automotive, Electronic Systems No-clean” indicates that the product requires cleaning method as defined by IPC no-clean standard and does not mean that the flux leaves no residue. No-clean rather means that the flux can be left on PCB for several consecutive SMT assemblies, also won’t cause corrosion if left indefinitely. The conductivity test is absolutely nonsense: it should be done AFTER the flux has been activated ; it is also true that I _always_ wash my boards with IPA.
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