How to identify the best suitable Solder Quality
Lets start with basics of Solder composition available in the market like we have solder in the combination of Tin (SN), Lead (PB), Copper (CU) and Silver (AG).
Normal Tin/Lead Solder ratios commonly used are (SN/PB): 10/90, 15/85, 20/80, 25/75, 30/70, 35/65, 40/60, 45/55, 50/50, 55/45, 60/40 and 63/37.
These are also referred as Leaded Solder Qualities.
Now the days consciousness related to environment and human health have increased thus companies have started using ROHS , NON-Leaded Solder Wires with their application, usually governed by European Norms and used by exporting companies in their products and by MNC's.
Normal Lead-Free Solder wire composition available are Tin/Copper (SN/CU), Tin/Silver/Copper in the ratio of 99.3/0.7 (SN/CU), 99/1 (SN/CU). 99/0.3/0.7 (SN/AG/CU) and 96.5/3/0.5 (SN/AG/CU) aka SAC 305.
SAC 307 also primarily used these days 96.3/3/0.7.
Today, with technological advancement and to reduce cost Antimonial, bismuth containing solder are produced which are hard and have high melting temperature thus doesn't suit every application but are economical than normal silver containing solder wires.
There are many factors that determine the choice of suitable solder quality:
