No, pharmaceutical-grade pure petroleum jelly (vazelin) is generally not recommended for lubricating silicone rubber seals in household coffee machines. While petroleum jelly is a lubricant, it is a petroleum-based product. Silicone-based lubricants are typically preferred for silicone seals because petroleum-based products can degrade silicone and rubber components over time, causing them to swell, soften, or crack [1] [2] [3]. This degradation can lead to leaks and ultimately damage the coffee machine.

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For coffee machine maintenance, it is crucial to use lubricants specifically designed for food-grade applications and compatible with the materials present in the machine, especially the brewing unit and its seals [4]. Many coffee machine manufacturers recommend using food-grade silicone grease for lubricating moving parts and seals within the brewing unit [5] [6]. This type of grease is formulated to be safe for contact with food and water, and it is compatible with silicone and rubber components, ensuring their longevity and proper function [4]. Using the correct lubricant prevents premature wear of parts and maintains the hygiene of the coffee preparation process [6].

Regular maintenance of coffee machines is essential for their reliable operation and extended lifespan [7]. This includes not only proper lubrication but also routine cleaning and descaling [8] [9]. Descaling is particularly important to prevent mineral buildup, which can obstruct water flow and damage internal components like the boiler and pump [8] [9]. For cleaning, specialized descaling agents and coffee oil remover tablets are recommended, and household products like vinegar or general household descalers should be avoided as they can harm the machine [8] [9] [10].