Plastic does not have one universal melting temperature. Different polymers have different molecular structures, and some plastics soften gradually rather than melting at one clear point.

Removing paint from plastic is difficult because a product strong enough to dissolve the paint may also soften, stain, crack, or dissolve the plastic underneath.

The amount of water in a plastic bottle is normally shown as the net volume on the label. There is no single standard quantity because bottles are made for different countries, retailers, events, vending machines, and drinking habits.