Tung Oil
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Tung oil is very popular today because of two properties: First it is natural or "green" product when it has dried. Secondly, after it cures (5 to 30 days, weather/temperature related), the result is a very hard and easily repaired finish. This is why it is used on boat decks and now on floors. The oil is often diluted with hydrocarbon thinner so that the viscosity is very low and enables the oil to penetrate the finest grain woods. This thinning vehicle evaporates within 15 to 20 minutes and results in a totally green residual finish. As mentioned above, when applied in many fine/thinner coats over wood, tung oil slowly cures to a satin "wetted wood" look with slight golden tint. Tung oil resists liquid water better than any other pure oil finish and does not darken noticeably with age and is claimed to be less susceptible to mould than linseed oil. Most importantly, of all the oil finishes, tung oil is the only drying oil that will polymerize 100% (completely harden). Linseed oil, for example, never completely hardens.
| Name | Result of Test |
| Color | Transparent or Slightly turbid, not darker than Gardner No 8. |
| Specific gravity (20/4°C) | 0.9360--0.9395 |
| Refractive Index (20°C) | 1.5170--1.5220 |
| Iodine Value | 163--173 |
| Saponification value | 190--195 |
| Moisture & Admixture (max) | 0.3% |
| Free Fatty acid (max) | 4% |
| Worstall's Heat test (max) | 7.5minutes |
| Model Beta tung oil test | Negative (No crystalizion) |
| Packing | 190kg/drum 15.2mts/FCL |
