👉 A blocking fluid, also known as a sealant or lubricant, is a substance used to prevent the relative motion of two surfaces by creating a barrier between them. It acts as a lubricant and a sealant, reducing friction and wear between moving parts in mechanical systems. By filling gaps or sealing joints, blocking fluids ensure smooth operation and longevity of machinery, such as engines, hydraulic systems, and bearings. Common examples include silicone oils, fluoropolymers, and various greases, each chosen for their specific properties like temperature resistance, chemical inertness, or low volatility.
