Tung oil (Chinese Tung Oil, Wood Oil) H.S. Code:1515903000 ColourNot darker than Gardner 9Specific gravity (20/4°C)0.9360--0.9395Refractive Index (20°C)1.5170--1.5220Iodine Value (WIJS)163--173Saponification value190--195Moisture & impurities (max)0.3%Free Fatty acid (max)4%Worstall's Heat test (max)7.5minutesModel Beta tung oil testNegative (no crystalization)