Corrosion Preventatives

Castrol Rustilo Aqua 30
Castrol Lubricant Oils Company Logo

High performance aqueous corrosion preventive


Castrol Rustilo Aqua  30 (previously called Aquasafe 30) is a new technology, high performance, environmentally friendly water-based corrosion preventive formulated on a selected blend of corrosion inhibitors. Rustilo Aqua  30 deposits an almost imperceptible light, soft greasy film, which is usually just provided by solvent-based products. Rustilo Aqua  30 does not contain heavy metals, such as barium.


Rustilo Aqua 30 is an aqueous temporary corrosion preventive providing short to medium term protection on metal parts and components during intermediate storage or transportation.

The product is intended for dip, low pressure spray and/or flood applications.

  • Water-based corrosion preventive – environmentally friendly, provides a safer working environment.
  • Solvent-free formulation:
    – Eliminates fire hazard.
    – Potential for reduced insurance premiums.
    – Not regulated by VOC legislation.
    – Non-ozone depleting.
    – Assists in achieving ISO 14001.
  • Deposits very thin protective film.
  • Safe and easy handling of components.
  • Provides excellent ferrous corrosion protection.
  • Low foam – suitable for dip, flood and low pressure spray applications.
  • Short drying time – minimum impact on process/production times.
  • If required protective films of Rustilo Aqua™ 30 can be removed by using a petroleum solvent or alkaline process cleaner, all available from Castrol.
Metal type Cast Iron, High alloy steel / Stainless steel, Low / Med alloy steel
Corrosion protection Indoor Storage
Formulated without Boron Yes
Formulated without Heavy Metal Yes
Product type Surface Treatments
Applicable to these sectors Aerospace, Automotive Manufacture, Machinery, Metal Goods, Metals

User Advice
Before treatment with Rustilo Aqua™ 30 the parts surface should be free of contaminants, such as oils, greases and
particles to ensure its best performance.
A very important aspect of water-based corrosion preventives is the drying time; once the product has been applied onto
the components. It must be allowed to dry (> 30 minutes) prior to the packaging of treated components in order to
ensure maximum corrosion protection.
Using supportive drying equipment, e.g. a hot air blower, could further reduce drying time.
Regularly check the pH of the product and ensure that the pH is maintained between 8.7 – 9.5.
Once the product is introduced into a holding tank pending application, it is advised to keep this tank covered to reduce
evaporation losses and reduction of deposit formations onto the application equipment. The application tank should
ideally receive agitation or stirring to maintain product dispersion.
Concentration of the film forming content of Rustilo Aqua™ 30 is determined by the non-volatile residues (total solids)
In order to minimise the risk of any stability or corrosion issues caused by increasing levels of water hardness and
corrosive inorganic salts (i.e. chloride) it is recommended to top-up evaporation losses with deionised water.

Additional Information
The claims on film thickness and consumption are average values. These are valid for smooth surfaces with good
drain-off characteristics and simple geometries without holes or recesses.
Average drying time is the time until the majority of the solvent is evaporated at ambient temperature and a relative
humidity of 60 – 70%. The full corrosion protection will be provided when the solvent is completely evaporated.
(*) “Indoor storage” describes the storage of ferrous components in closed store-rooms having a relative humidity of
60%. Increased protection times could be achieved by treating finished surfaces or storing the parts in a sealed pack.
(**) “Outdoor storage” describes open storage, which assumes primary protection from the elements by tarpaulin or
other form of cover.

To avoid product deterioration always keep the container/drum tightly sealed. Store the product in a cool, dry place away
from direct sunlight. Prevent exposure to frost and avoid water ingress. For optimum product stability, it is preferable to
store the product indoors between 5°C and 45 °C / 41°F and 113°F.
For more details, please refer the product safety data sheet.
This product was previously called Aquasafe 30. The name was changed in 2015.


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