Rhode Island Journeyman Plumber Practice Exam

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What is the maximum lead content allowable in lead-free solder and flux?

0.1%
0.2%
0.5%
0.9%

The correct answer is: 0.5%

The maximum lead content allowable in lead-free solder and flux is established by regulations to ensure safety, especially in applications related to drinking water and food. According to the standards set by the Safe Drinking Water Act, lead-free solder must contain no more than 0.2% lead. However, solder that can be classified as "lead-free" may have a higher limit for some applications. Thus, the correct answer aligns with the most recognized standard, where the maximum allowable lead content in lead-free solder and flux is indeed 0.2%. This limit helps to minimize exposure to lead, promoting healthier environments. Understanding these regulations is crucial for plumbers, as using appropriate materials helps to maintain compliance with safety standards and protect public health.