Which of the following materials is commonly used in casting for limb immobilization?

Fiberglass is commonly used in casting for limb immobilization due to its specific properties that make it ideal for creating a strong, lightweight, and durable cast. Fiberglass casts are preferred because they are water-resistant and allow for breathability, which can enhance patient comfort and hygiene. Additionally, the material is easy to mold to the shape of the limb, providing a custom fit that ensures effective immobilization and support during the healing process.

In contrast, while plastics can be used for immobilization, they are not as frequently chosen for traditional casts compared to fiberglass. Silicone may be used in some orthopedic applications, particularly for splinting or padding due to its flexibility and cushioning properties, but it is not typically used as a casting material. Metal is too heavy and rigid for casting purposes, making it impractical for limb immobilization. Therefore, fiberglass stands out as the most appropriate and effective choice for this specific application.