Water—either as a formula ingredient
or a contaminant—plus other electrochemically
active formula ingredients
cause or contribute to the corrosion of
spray package materials…
May 2020 SPRAY 31
• Don’t assume raw materials from different vendors have the
same corrosivity or non-corrosivity
• Raising pH is not a sure-fire way to reduce spray package
corrosion
• Propellant might also cause or contribute to spray package
corrosion by partitioning formula ingredients between the
bulk formula and propellant phases
• Don’t assume an anhydrous formula is water-free
• The amount of contaminant water determines if an
anhydrous formula is or is not corrosive—sometimes there is
a safe concentration range
• Don’t assume a given formula is not corrosive just because
individual ingredients by themselves are not typically
corrosive (i.e., watch out for synergy)
• Don’t assume one type of spray package or spray package
materials is more corrosion-resistant than others
• Higher temperatures rarely accelerate corrosion
Please visit www.pairodocspro.com for more information.
Thanks for reading and I’ll see you in June. Spray