Definition: Sulphurproof is a term in chemistry that refers to a material or substance that has a high level of resistance to the action of sulfur dioxide, also known as SO2. This means that it can withstand the corrosive effects of sulfur dioxide and other acids, making it useful for cleaning and decontaminating surfaces. Sulfurproof materials are often used in industries such as refining, chemical production, and waste treatment to prevent damage from the acid.