This article provides a body of knowledge on contact angle measurements and their role in heritage preservation. The contact angle method is an essential tool for evaluating the wetting characteristics of heritage materials, including stone, wood, textiles, and ceramics. The chemical composition and surface properties of heritage objects significantly influence their wetting behavior. The contact angle measurements offer insights into the hydrophobicity or hydro-philicity of materials and enhance our understanding of material behavior in response to environmental challenges.  The effectiveness of conservation treatments often relies on the interaction between treatment agents and the substrate material. By correlating contact angle results with material composition, conservators can develop more effective preservation strategies tailored to specific materials. This approach ultimately strengthens the resilience of heritage objects against deterioration and loss over time. Contact angle measurements should be conducted in conjunction with surface structure and chemical composition analyses, as they do not provide a comprehensive description of surface properties.