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When rubber is exposed to acetone, several noticeable changes can occur. The solvent can penetrate the rubber matrix, leading to physical and chemical alterations. One of the primary effects is swelling, whereby the rubber expands as acetone molecules infiltrate the polymer chains. This swelling can be substantial, often resulting in a soft, gummy texture that compromises the rubber's mechanical properties. Prolonged exposure can lead to significant degradation, ultimately causing the rubber to lose its elasticity and strength, leading to failure in applications where structural integrity is critical.
acetone on rubber

Potassium sorbate, also known as sorbistat-k, E-202 and sorbistat-potasium, is a white, odorless, and tasteless salt. Although it is naturally occurring in some fruits like berries, it is commercially produced by a neutralization reaction between sorbic acid and potassium hydroxide. It is an inactive salt form of sorbic acid and just like sorbic acid, it has been found to be active against molds, yeasts, bacteria and fungi. Because of these antimicrobial activities, it is often used as a preservative in the food and beverage industries to preserve foods like cheese, yogurt, dried meat, bread, cake, milkshakes, pickles, ice cream and apple cider.