Fiber Classification

Step 1: Understand the chemical composition of glass fiber. Glass fiber is made primarily from silica (silicon dioxide, SiO ), which is the main component of sand, along with other metal oxides.

Step 2: Classify the fiber based on its chemistry.
- Organic fibers are based on carbon chemistry. This includes natural fibers (cellulosic like cotton, protein like wool) and synthetic polymers (polyester, nylon, acrylic).
- Inorganic fibers are not based on carbon. They are derived from minerals or geological sources. Glass (silica-based), carbon fiber (pure carbon), and asbestos (silicate minerals) are examples.

Step 3: Evaluate the options.
- (A) Protein fibers (e.g., wool, silk) are organic.
- (B) Inorganic fibers are derived from non-living, mineral sources. Glass fits this description perfectly.
- (C) Cellulosic fibers (e.g., cotton, rayon) are organic.
- (D) Elastomeric fibers (e.g., spandex) are organic polymers.

Conclusion: Glass fiber is an inorganic fiber.