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Stephen Tait

Water & Spray Package Corrosion

June 1, 2023

Part 2 Hello, everyone. In this issue, we’ll complete the discussion of water’s role in spray package corrosion. Water-corrosion is a complex, multi-step process. For example, one type of aluminum pitting corrosion involves multiple steps: 1. Water reacts with aluminum to form small areas of aluminum-hydroxide gel on top of the package-metal or the metal […]

Water & Spray Package Corrosion

May 1, 2023

Part 1 Hello, everyone. This month, I’m starting a two-part series on the roles that water plays in causing or contributing to spray package corrosion. Water is in a formula as either an ingredient or a contaminant. Steel alloys and aluminum alloys are both used to fabricate spray packages with and without coatings or laminate […]

Why is spray package corrosion so inconsistent?

April 1, 2023

Hello, everyone. One of the most difficult questions to answer about corrosion is why it is so random. For example, you may open and inspect 12 traditional aerosol container spray packages after six months of storage stability testing to find: • Five corrosion-free packages • One package with corrosion on the liquid product area • […]

Spray package material defects

March 1, 2023

Part 2: Tinplated steel aerosol containers & laminated foil bags Hello, everyone. In the previous issue, I began a series on material defects in spray packaging to discuss their relationship with spray package corrosion. We began by focusing on the more common defects in aluminum aerosol containers. This month, we’ll continue with the more common […]

Spray package material defects

February 1, 2023

Part 1: Traditional aluminum aerosol containers Hello, everyone. Defect-free spray package materials do not exist and these defects are often misidentified as corrosion. Even though defects don’t often contribute to or cause spray package corrosion, some formulas will interact with defects to produce package corrosion. Thus, there are always potential concerns as to whether or […]

Interaction between sales and package corrosion

January 1, 2023

Hello, everyone. New products and derivative products typically have several timetables. One of these is an ideal timetable for sales (Target Sales) and the other is the actual sales timetable that is determined by the strength or weakness of the economy. Package corrosion also has a timetable, referred to as the package service life (PSL). […]

Substituting empirical models for package corrosion tests

December 1, 2022

Hello, everyone. I have often been asked if corrosion could be mathematically modeled so that long-term corrosion testing could be either shortened or skipped. The short answers are Yes-and-No. There are many potential formula and package material factors that cause or contribute to the corrosion of spray package materials. The seven major categories of corrosivity […]

High temperature corrosion storage tests, Part 2

November 1, 2022

Hello, everyone. I started a two-part series about the science for using higher temperatures to accelerate the rate of spray package corrosion as a possible way to reduce storage test time in the last issue. The first part centered on the science for the Arrhenius equation, often used to justify using higher temperatures to accelerate […]

High temperature corrosion storage tests, Part 1

October 1, 2022

Hello, everyone. Limited budgets for testing, as well as pressure to quickly commercialize new products and derivative products (line extensions), often force the taking of short-cuts in corrosion tests. Indeed, higher temperatures are often used to accelerate spray package corrosion to shorten the time needed for corrosion testing. However, there are many pitfalls to this […]

Corrosion control is a process, not a one-time event

September 1, 2022

Hello, everyone. Corrosion prevention and control for all types of spray packaging is a continuous process and not a one-time event. The risk of corrosion is always greater than zero and the risk could be as high as approximately 62% when there is no corrosion data for new formulas and derivatives of current formulas (line […]