Which of the following best summarizes the required precaution when working with DEF in SCR systems to prevent exposure?

• A. Wear PPE for protection from high temperatures.
• B. Prevent skin and eye contact with DEF.
• C. Wear hearing protection.
• D. Use gloves only for handling fluids.

Answer: (B)

DEF is a urea-based solution used in SCR systems. The main exposure risk is contact with skin and eyes, which can cause irritation. The best precaution is to prevent skin and eye contact with DEF. This means using appropriate eye protection and gloves, avoiding splashes, and flushing with plenty of water if contact occurs. While gloves are important, protecting eyes and preventing any skin contact covers the most likely exposure route. PPE for heat or hearing protection doesn’t address this primary risk, and relying on gloves alone doesn’t emphasize the essential need to shield the eyes and skin from contact.