How long must the packaging of SAW flux be able to keep the contents dry?

• A. Up to 6 months
• B. Up to 1 month
• C. Up to 1 year
• D. Up to 2 weeks

Answer: (A)

SAW flux is highly moisture-sensitive, so its packaging is designed to keep the contents dry for a defined shelf life under normal storage. If the flux absorbs moisture, hydrogen can be released during heating, leading to weld defects like porosity or hydrogen-induced cracking. Manufacturers provide a conservative, guaranteed dry period for sealed packaging so you can store flux without it compromising quality. Six months is the standard minimum period that's typically guaranteed for keeping SAW flux dry in its packaging under normal conditions. Shorter intervals would not ensure dryness for typical storage, while longer intervals are not usually guaranteed because packaging and flux properties can drift with time. After the flux is opened, any moisture uptake should be addressed per the supplier’s instructions, but the sealed packaging is intended to remain dry for about six months.