Thailand has long been a large manufacturer and exporter of electronic products and the annual export value is over 1 trillion bath but many countries have issued environmental regulations to control the use of certain toxic substances in electronic products. For example, RoHs of the European, ACPEP of China, JGPSSI of Japan. Therefore, electronic products using solder containing Pb cannot be sold in those countries. As a result, the electronics industry must adapt to use read-free solder instead of the traditional solders containing tin and lead (Sn-Pb solders).