Polyvinyl Chloride (PVC) is a versatile thermoplastic used in a wide range of applications, from plumbing and electrical conduits to vinyl siding and records. Its thermal properties are crucial for processing and applications. PVC's melting temperature is not singular due to its amorphous nature; instead, it softens over a range starting around 160°C (320°F) and completely melts between 212°C and 500°C (414°F to 932°F) depending on its formulation, particularly the presence of plasticizers which lower the melting point. For practical use and processing, this range is essential to know for achieving the right conditions for molding, extrusion, or other forms of shaping without degrading the material. The broad melting range also allows for the compound to be tailored to specific requirements of flexibility, durability, and resistance to chemicals and weathering, making PVC a highly adaptive material for various industries.

When carbon dioxide dissolves in water. it forms carbonic acid. a weak acid. That's how carbon dioxide causes ocean acidification.

The emblem for recyclable Low-Density Polyethylene (LDPE) is a triangular recycling symbol with the number 4 inside it. This symbol signifies that the item is made of LDPE, a type of thermoplastic made from petroleum. LDPE is known for its flexibility, toughness, and relative transparency, making it popular for manufacturing plastic bags, containers, and various packaging materials. The presence of this emblem encourages consumers to dispose of the item correctly, usually in recycling bins designated for plastics, to facilitate its recycling process. Despite its recyclability, the effectiveness of LDPE recycling depends on local facilities' capabilities and the contamination level of the material. Therefore, it's encouraged to reduce, reuse, and then recycle as a last resort.