Which chemical is not an approved agent?

The chemical identified as delimer is not considered an approved agent for food contact surfaces. Delimers are typically used for cleaning and removing mineral scale or buildup and are designed for equipment and machinery maintenance, not for sanitization or disinfection in food processing environments. While these substances can effectively clean and restore surfaces, they may leave harmful residues if not thoroughly rinsed and are not formulated for use as a sanitizing agent.

On the other hand, the other chemicals listed—chlorine, iodine, and quaternary ammonium compounds—are recognized as effective sanitizers for food contact surfaces. Chlorine is commonly used in various forms for disinfecting water and surfaces; iodine serves as an effective sanitizer in many food service scenarios; and quaternary ammonium compounds are often included in sanitizing solutions designed specifically for food establishments, offering a non-corrosive option with good residual effects.

Understanding the specific purpose and appropriate use of cleaning and sanitizing agents is vital for maintaining food safety and preventing contamination in food-handling environments.