Bis-PEG6-NHS ester is widely used in bioconjugation and crosslinking applications. It serves as a linker to connect biomolecules, such as proteins, peptides, or antibodies, with other molecules or surfaces. Its PEG spacer enhances solubility and reduces steric hindrance, making it ideal for creating stable conjugates in drug delivery systems, diagnostic assays, and targeted therapies. Additionally, it is employed in surface modification to functionalize materials for biomedical research, improving biocompatibility and performance in various applications.