Decahydronaphthalene, commonly known as decalin, is a colorless liquid hydrocarbon with the chemical formula C10H18 that is widely used as a solvent and processing aid in chemical manufacturing. Although considered relatively low in acute toxicity, decalin can still irritate the skin and respiratory system with direct exposure. In sealing environments, O-rings, rubber components, gaskets, and certain plastics should be evaluated for compatibility, as decahydronaphthalene may cause swelling or softening in some rubber materials. Proper handling and storage practices are recommended to maintain safety and material performance.

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