Trench drains used in chemical or corrosive conditions shall be made of ___________________.

Trench drains used in chemical or corrosive conditions are best made of stainless steel due to its excellent resistance to corrosion and ability to withstand harsh chemicals. Stainless steel provides a durable and sturdy option that can maintain integrity and functionality in environments where other materials might degrade or fail. It has a high tensile strength and is less likely to corrode over time, which is crucial in applications where exposure to corrosive substances is a concern.

Other materials, such as cast-iron and concrete, can degrade and rust when exposed to aggressive chemicals, reducing their lifespan and potentially leading to failure in drainage systems. Similarly, while plastic can be resistant to many chemicals, it may not hold up well under extreme temperatures or mechanical stress associated with certain installations. Therefore, stainless steel is the most suitable material for trench drains in these specific conditions.