As a specialist in the field of materials science and engineering, I have a deep understanding of the properties and behaviors of various materials, including plastics such as PVC. Polyvinyl Chloride, commonly known as PVC, is a widely used plastic material that is known for its durability and resistance to corrosion. However, it is also sensitive to heat, which can affect its structural integrity.

Boiling water, which is typically at a temperature of around 100 degrees Celsius (212 degrees Fahrenheit), is not hot enough to melt PVC pipes. PVC pipes are designed to withstand temperatures up to about 60 degrees Celsius (140 degrees Fahrenheit) continuously without any significant degradation. However, the reference to a temperature of 175 degrees Fahrenheit, which is approximately 80 degrees Celsius, suggests a scenario where the heat could potentially cause the plastic to soften or become more pliable. This is particularly true for the joints or fittings of PVC pipes, which may be more vulnerable to heat than the pipes themselves.

It's important to note that PVC pipes are not typically used in applications where they would be exposed to boiling water. In household plumbing, for example, PVC pipes are used in the supply lines for cold water, not hot water. Hot water supply lines are usually made from materials that can withstand higher temperatures, such as copper or PEX (cross-linked polyethylene).

The process of unclogging a drain with boiling water is based on the idea that the heat can help to break down or dislodge minor blockages. While this method can be effective for some types of blockages, such as those caused by organic matter or small debris, it is not suitable for more stubborn blockages like grease or large objects. In such cases, other methods or professional intervention may be necessary.

In summary, while boiling water can be a useful tool for clearing minor blockages in drains, it is not hot enough to melt PVC pipes under normal circumstances. However, extreme caution should be exercised when using boiling water near PVC pipes, especially if the water temperature exceeds the recommended safe operating temperature for PVC. It is always best to consult with a professional plumber or a materials expert to ensure that the methods used are safe and appropriate for the specific materials and conditions in your plumbing system.

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It's not guaranteed to unclog physical or grease blockages, but if you have a slow drain that you think is due to a light or small blockage, a good boiling water flush can clear it out with minimal effort. ... If you have PVC pipes, water over 175 degrees can soften or melt the joints in your pipes.Jul 26, 2011read more >>