I want to know the answer to the following question:
What in combination with glass fibers is used to make fiberglass?
All the background I'm provided with is that "When extruded as glass fiber and matted as glass wool in a way to trap air, it becomes a thermal insulating material, and when these glass fibers are embedded into an organic polymer plastic, they are a key structural reinforcement part of the composite material fiberglass.". Is that enough to answer the question?