Bis-Mal-PEG11（Cat No.:I023434）is a homobifunctional polyethylene glycol crosslinker bearing maleimide groups at both termini. The maleimide moieties enable highly selective and stable conjugation with thiol groups, making it ideal for protein modification, antibody engineering, and drug conjugation. The PEG11 spacer enhances hydrophilicity, reduces aggregation, and provides optimal spacing to minimize steric hindrance while improving solubility in aqueous and organic systems. With its balanced length and flexibility, Bis-Mal-PEG11 is widely applied in developing bioconjugates, polymer–protein hybrids, and advanced biomaterials for research and therapeutic applications.