Question: what is the difference between pvc and fiberglass?
Answer: However, fiberglass is more sensitive to embedment quality since it has less flexibility and it is subject to strain corrosion. In summary, both standards include stiffness-equivalent pipes at PS = 46 psi and PS = 72 to 75 psi; PVC includes a third product line that is much stiffer at PS = 115 psi.