Used as a stabilizer and curing agent in polymer systems, particularly in epoxy resins, where it enhances thermal stability and mechanical strength. It serves as a source of guanidine in pharmaceutical synthesis, especially in the production of antiviral and antidiabetic compounds. Commonly employed in DNA and protein extraction protocols due to its ability to denature biomolecules and inhibit nuclease activity. Also utilized in electroplating baths as a conductive salt to improve deposit uniformity and surface finish. Its high solubility and thermal stability make it suitable for use in fuel cells and other electrochemical applications.