TD20 and TD30 are effective touch-dry temporary corrosion preventatives. They have been specifically formulated for both ferrous and non-ferrous metals. They’re used for the protection of all engineered and manufactured components in any environmental conditions or situation they encounter. In a nutshell, TD20 and TD30 were designed to prevent corrosion and reduce friction while leaving a less greasy feel on finished steel products.

However, we should look at the contributing factors which determine why these two corrosion preventives perform so well and why there is a discernable difference in performance. Density, viscosity, dry film thickness, and coverage are all key to the performance of these products in the field. We’ll take a deeper dive into these below.

1. Density at 20°

TD20 exhibits a density of 0.79 g/cm3, whereas TD30 has a slightly higher density of 0.81 g/cm3. While numerically there’s not much in it, density determines the ability to form a protective film between moving surfaces. As a rule of thumb, higher density leads to a thicker protective film and makes for better long-term protection against corrosion getting a foothold. As density helps determine viscosity, it’s important not to take a siloed approach when comparing TD20 v TD30.

2. Viscosity at 40°

Although it’s not a consideration when selecting a ‘temporary corrosion preventive’ viscosity is an influencing factor to the dynamics of a corrosion preventive fluid and its performance.

When comparing viscosity, TD20 has a viscosity of 1.5 cSt. Whereas TD30 has a slightly higher viscosity of 1.9 cSt. While TD20 and TD30’s viscosity levels are extremely efficient in reducing friction and preventing corrosion, a higher viscosity means it can support heavier loads. Plus, viscosity is important as it determines the lubricant’s ability to remain effective and stable over a variety of operating conditions.

This is a useful characteristic if you’re exporting steel goods across the globe. However, viscosity level determines various factors including the means of application, and the expected temperature range at which the fluids will work and continue to perform.

3. Dry Film Thickness

TD20 produces a dry film thickness in the range of 2 to 3 microns after the solvent has evaporated. Whereas TD30 generates a marginally thicker dry film of 4 microns. As suggested, TD20 and TD30 afford a near-touch dry film. Careful selection of high quality inhibitors, waxes, and base oil ensures that these required attributes are attained.

In terms of inhibitors, TD20 has 20% active inhibitors in comparison to TD30 which stands at 30%. While both are excellent in terms of corrosion and rust protection, TD30 affords a slightly higher degree of protection to steel and metal components than TD20.

4. Coverage

Both Steelgard TD20 & TD30 have excellent coverage (90 – 100 Square metres per Ltr) making them extremely economical and cost effective. The Steelgard range is specifically formulated to give the highest degree of performance without resorting to thick, messy coatings, that give poor coverage and can be difficult to remove.

Careful selection of the correct raw materials ensures that the Steelgard TD products perform at the highest possible level. Affording the degree of performance and protection to maintain the integrity of the metal surface whether in between processes, in storage or during transportation.


In conclusion, we compared TD20 and TD30 corrosion preventatives based on; density, viscosity, dry film thickness, and coverage. The choice between TD20 and TD30 depends on specific application requirements, such as anticipated duration, surface area to be covered, and film thickness.  There’s no doubt these two corrosion preventatives are best in class for preventing corrosion. Finally, TD20 excels in short-term applications, economically providing a thinner dry film. On the other hand, TD30 is preferable for longer-term use, featuring a marginally thicker dry film.

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