Which of the following is NOT listed as a kind of acid waste pipe material?

• A. PVC
• B. Silicon iron
• C. Lead
• D. Borosilicate

Answer: (A)

The main idea is how materials stand up to acidic wastes. Acid waste piping needs materials that resist corrosion from strong acids, so listings for acid waste pipe materials include substances known to tolerate those chemicals. Lead, borosilicate glass, and iron alloys like silicon iron are recognized for their acid resistance in traditional practice, which is why they appear on such lists. The plastic PVC, while excellent for many general waste applications, isn’t listed as an acid waste material because concentrated acids and some aggressive acids can attack PVC, especially at higher temperatures. That’s why PVC is not included in that category, making it the best choice for the option that is NOT listed.