Under what temperature are polyphosphate films considered permanent?

Polyphosphate films are commonly used in water treatment processes as a means to control scaling and stabilize water quality. The temperature at which these films are considered permanent is critical for ensuring their effectiveness in preventing corrosion and scaling in plumbing systems.

At 120°F, polyphosphate films achieve a degree of stability where they can adhere effectively to surfaces in water systems, thereby maintaining their protective qualities. Above this temperature, degradation of the film can occur, leading to reduced efficacy in preventing scale buildup and corrosion.

Understanding the relationship between temperature and the stability of polyphosphate films is important for optimal water treatment practices. For instance, if the temperature exceeds 120°F, the films may not perform as intended, creating potential issues within the treated water systems. Thus, maintaining the treatment processes below this threshold ensures that the films remain effective and provide long-term protection.