Tuesday, September 06, 2016

Curses! Environmental Stress Cracking

We've had a lot of aphids attacking plants in our garden this year. My usual approach is to use an insecticidal soap that I make by diluting down from a concentrate. "Normal" soap is the sodium salt of a fatty acid, while an insecticidal soap is just the potassium salt, which means the soap is relatively safe. It also works pretty well against the critters, and clean-up is easy. But they have gotten so out of hand that instead of making it up as needed, I made up a larger amount in a spray bottle and kept it in a cabinet.

Over the weekend, I knocked the bottle to the garage floor. No biggie; I picked it up and put it back in its place. But yesterday, I noticed that the soap had leaked out of the container. I picked up the bottle and saw this:
Environmental Stress Cracking of Polyethylene due to Soap
What an idiot I was. It was a polyethylene bottle with dilute soap in it and it had been stressed by the fall to the cement - a situation just begging for environmental stress cracking and that was what I got.

Environmental stress cracking (ESC) is where polyethylene and other plastics, when exposed to non-solvents and stress, break down unexpectedly. Soap and polyethylene. How can there by any interactions, especially at room temperature, especially when PE can withstand strong acids and bases, concentrated soaps and surfactants, bleach, hydrogen peroxide and more? And if you think you have an idea, then be prepared to explain why polypropylene doesn't experience ESC.

As you can imagine, I'll be on the lookout for a PP-based spray bottle for next year.

Previous Years

September 6, 2013 - A response to the ChemBark post (partially) about me

September 6, 2012 - Somewhere in a movie balcony...

September 6, 2011 - Polymorph Determination through Nanoindentation

September 6, 2007 - A resurgence of French?


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This article is interesting because it discusses how environmental stress cracking can affect curse words. I didn't know that this was a thing but it makes sense. I'm curious to know if there are any other words that are affected by this phenomenon.

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Curses! Environmental stress cracking (ESC) is a type of failure that can occur in materials exposed to certain combinations of stress and environment. The stress can be either applied externally, as in a tensile load or internally, as in a pressure vessel containing a liquid or gas.

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Curses! Environmental Stress Cracking is an enlightening post, which teaches us how important this is to clean our environment. The interesting point of this post is the discussion reflecting how environmental stress crack can distress our curse words.

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Environmental Stress Cracking (ESC) is a form of material degradation caused by the combination of mechanical and environmental stressors. It is an important factor to consider when designing products for use in hostile or corrosive environments, as it can severely weaken the materials and cause failure.

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Combination of mechanical and environmental stressors. It is an important factor to consider when designing products for use in hostile or corrosive environments, as it can severely weaken the materials

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Aluminum foil effectively blocks radiation, air, water, and microorganisms. This is why foil is so standard in packaging consumables and medicinal products. China CPP film manufacturers packing may also be created using aluminum foil. Perishable items may be kept in this packaging for an extended time without refrigeration.

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