Spray package material defects—Part 2

Hello, everyone. In the last issue, I began a series on material defects in spray packaging and the relationship between these defects and corrosion. This month, I’ll discuss the more common material defects found in laminated foil bag packages—bag-on-valve (BOV) packaging—as well as both coated and uncoated steel aerosol containers. The final, Part Three discussion […]

Spray package material defects: Part 1

Hello, everyone. There is no such thing as defect-free spray package materials. There are always potential concerns as to whether or not defects will contribute to, or cause, spray package corrosion and if corrosion at the point of defect will cause spray packages to fail (leak). This issue starts a three-part discussion on material defects […]

Why storage tests fail to predict actual corrosion

Hello, everyone. Static storage testing—also known as storage stability testing (both SST)—is the oldest form of corrosion testing for spray packaging. The goal of an SST is to ensure that products are safe to use, provide the expected efficacy and do not leak during the time consumers use the product. Package failures in the market, […]

A perspective on spray package corrosion

Happy New Year, everyone! In the August 2023 edition of Corrosion Corner, I discussed how corrosion failures are very expensive. These occur when packages leak, do not completely exhaust when spraying or when product is discolored or has a malodor because of package corrosion. The cost of spray package corrosion could include: • Corrosion testing […]

Spray package corrosion barriers

Part 3 Hello, everyone. This month, we’ll complete the three-part series begun in (part 1, October), (part 2, November) with a discussion on how coating glass transition temperature (Tg) changes when formula ingredients permeate coatings, as well as how higher storage test temperatures can produce misleading corrosion test results. Coatings have physical properties, such as […]

Spray package corrosion barriers-Part 2

Hello, everyone. In the last issue, we began a three-part series (Part 1) with a discussion on how the complex composition of metal surfaces causes coating pores and voids and how they allow formula ingredients to absorb into and through coatings. Epoxy, Micoflex, polyethylene terephthalate (PET) and bi-layer nylon-polypropylene laminate films are typically used as […]

Spray package corrosion barriers–Part 1

Hello, everyone. It’s commonly believed that a barrier is needed between a spray package’s base metal/metal foil and a formula to prevent corrosion of the metal/metal foil packaging. It’s also commonly believed that coatings and laminate films are these barriers. I’ll refer to both coatings and laminate films as “coatings.” Coatings do not always prevent […]

Corrosion Control & Prevention

They’re processes, not one-time events… Hello, everyone. The risk of corrosion is always greater than zero and could be as high as 62%, particularly when there is no corrosion data for new formulas or derivatives of current formulas (line extensions). Two types of corrosion tests are available for spray packaging: the traditional long-term storage stability […]

Spray package corrosion is always present!

Hello, everyone. Your spray products have probably both changed and evolved over time. Changes/evolutions are driven by the desire to have: 1. Sustainable raw materials; 2. Environmentally friendly (Green) raw materials; 3. Water used as a solvent instead of petrochemicals; 4. New ingredient technologies; and 5. New package material technologies, to name a few. All […]

Microbiomes, Enzymes & Spray Package Corrosion

Hello, everyone. “Natural, sustainable ingredients” and “Green ingredients” are the current guiding phrases when formulating new products and derivatives of existing product bases. We are all used to “natural” ingredients in spray products; indeed, the quintessential natural formula ingredient is a fragrance. More recently, probiotics (microbiomes) and enzymes, to name a few, have been discussed […]