The FDA recognizes pure tung oil as Generally Recognized as Safe (GRAS) for indirect food contact. Because it is a natural oil that cures hard and non-porous, it creates a waterproof barrier that does not flake or chip like polyurethane.
Is Tung Oil Safe Indoor Projects: Key Considerations and Best Practices
Once the oil is fully cured—which can take up to 30 days—the surface is completely inert and non-toxic. Conversely, if you are using the "wipe-on" variety found in most big-box stores, you are dealing with a mixture that contains thinners.
If you are using a pure, 100% tung oil, the main concern is the heavy evaporation of the oil itself, which can be thick and sticky in its liquid state. The solvent in these mixtures is the primary source of toxicity, releasing volatile organic compounds (VOCs) into the air during application.
Is Tung Oil Safe Indoor Projects: Understanding the Risks
Check the cure by water-beading; once water soaks in, the cure is complete. Is tung oil safe for the environment, for the craftsman, and for the family pet wandering across the finished floor? The short answer is yes, but with important distinctions that separate pure tung oil from its diluted counterparts and determine how safe the application process truly is.
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