Polypropylene (PP) is a type of thermoplastic polymer used widely in everything from packaging, textiles, to automotive parts due to its resistance to chemicals, heat, and fatigue. Normally, polypropylene should not have a very noticeable smell as it is inherently odorless in its pure form. If a polypropylene product emits a strong odor, this could be due to the presence of additives used during its manufacture or because of degradation. Over time and under certain conditions, like excessive heat or sunlight exposure, polypropylene can degrade, potentially releasing volatile organic compounds (VOCs) that might carry a noticeable smell. It's also possible that the smell comes from residues of substances the polypropylene has come into contact with rather than the material itself. If the odor is a concern, especially in applications requiring purity and non-toxicity, it's advisable to look into the specific type of polypropylene used and the conditions to which it has been exposed.

PVC pipes themselves do not freeze; rather, it is the water inside them that freezes. Water freezes at 32°F (0°C). However, the temperature at which the water in the PVC pipes will freeze depends on several factors, including the pipe's insulation, exposure to wind chill, and whether the water is flowing or stagnant. Better insulated and buried pipes might resist freezing longer, even as ambient temperatures drop below the freezing point. To prevent freezing, ensure your pipes are properly insulated, consider using heat tape in particularly vulnerable areas, and keep a trickle of water running through pipes during extremely cold spells.

It is expected that raw titanium will cost between $10 and $30 per kilogram in 2021. depending on the shape. purity. and quantity. Nevertheless. titanium products. such as rods. sheets. or tubing. are often more costly. Commodity prices fluctuate. so consult a trusted supplier for the latest information.