Which property do thermoplastics exhibit regarding their melting points?

Thermoplastics are characterized by their ability to become pliable or moldable upon heating and to solidify upon cooling. This property allows them to be repeatedly remolded and reshaped without undergoing any significant chemical change. They generally have fairly low melting points compared to other types of plastics, which makes them suitable for a wide range of applications including injection molding and extrusion.

When heated, thermoplastics soften and can be formed into various shapes, making them convenient for production processes that require the material to be reshaped. Once cooled, they retain the new form, but can be reheated and remolded again. This quality is particularly useful in manufacturing and design as it allows for flexibility and reusability in product development.

The other properties mentioned in the other options do not accurately describe thermoplastics. While some thermoplastics can have high melting points, many fall into the category of having lower melting points compared to thermosetting plastics, which is why the emphasis on fairly low melting points is key to their identity.