RLN-27 DERUSTING CHEMICAL RLN-27 is a fictional name, as of my last update in January 2022, there is no widely recognized or established product with this name in the realm of derusting chemicals. However, derusting chemicals are typically used for removing rust from metal surfaces. These chemicals often contain acids or other active ingredients that dissolve or convert rust into a removable form. Some common active ingredients in derusting chemicals include phosphoric acid, citric acid, oxalic acid, and hydrochloric acid. When using any chemical product, it's essential to follow the manufacturer's instructions carefully, wear appropriate personal protective equipment, and ensure proper ventilation to avoid potential hazards. If you're looking for a derusting chemical for a specific application, it's best to consult with a supplier or expert in the field to find the most suitable product for your needs.