ABSTRACT The performance of fiber‐reinforced rubber composites is highly dependent on the interfacial adhesion between the fiber and the rubber matrix. Conventional resorcinol‐formaldehyde‐latex (RFL) dipping systems, although effective, pose significant health and environmental risks due to the toxicity of resorcinol and formaldehyde. In this study, a formaldehyde‐free and resorcinol‐free blocked waterborne polyurethane/latex (WPU/L) dipping system was developed. Key synthesis parameters, inclu