What percentage of antimony by weight must a lead floor flange contain?

The correct answer is based on specific regulations pertaining to the composition of lead materials used in plumbing fixtures. For lead floor flanges, the required percentage of antimony is 7.75% by weight.

Antimony serves as an alloying element in lead to improve its mechanical properties and corrosion resistance. Understanding material specifications like these is crucial for ensuring compliance with safety standards and regulations in plumbing applications. This is particularly important in New York City, where building codes are stringent and must adhere to specific requirements to ensure safety and reliability in plumbing systems.

Knowing the composition not only helps in choosing the right materials for plumbing fixtures but also keeps in line with environmental health guidelines aimed at reducing lead exposure risks.