Corrosion Preventatives

Castrol Rustilo DWX 31

Dewatering corrosion preventive


Castrol Rustilo™ DWX 31 is a powerful solvent deposited corrosion preventive with excellent dewatering properties.
The product, following evaporation of the solvent, leaves a soft greasy protective film


Rustilo DWX 31 rapidly removes water from components subsequent to metal treatment processes such as
electroplating processes, after machining using soluble cutting fluids or parts that have been washed. It is
suitable for use on cylinder liners, gears, spiral springs, simple hand tools, steel rods and bars etc.
The thin residual film provides effective medium term protection against corrosion during intermediate storage
or transportation.
Although Rustilo DWX 31 can be applied by brushing or spraying, its dewatering action is most effective if the
articles to be protected can be immersed in a dip tank.

  • Based on de-aromatised hydrocarbon solvent – mild odour increases operator acceptance
  • Free from heavy metals, such as Barium – improves environmental profile and helps reducing
    waste disposal cost
  • Superior film retention and fingerprint suppressant characteristics – minimises risk of corrosion
  • Excellent water displacing and penetrating properties and high stability against acidic and alkaline
    contaminations – enables a long bath-lifetime which helps reducing operational cost
Metal type Cast Iron, High alloy steel / Stainless steel, Low / Med alloy steel
Corrosion protection Indoor Storage
Formulated without Heavy Metal Yes
Product type Surface Treatments
Applicable to these sectors Aerospace, Automotive Manufacture, Machinery, Metal Goods, Metals
  • 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 just 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 when treating finished surfaces or store 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.
  • Influence of temperature may cause some cloudiness or thickening, which is reversible and doesn’t have an
    impact on product quality.
  • If required protective films of Rustilo DWX 31 can easily be removed by using a petroleum solvent or alkaline
    process cleaner, all available from Castrol.

All packages should be stored under cover in a ventilated area at ambient temperature. Where outside storage is
unavoidable drums should be laid horizontally to avoid the possible ingress of water and the obliteration of drum
Rustilo DWX 31 should not be exposed to hot sun or cold temperature conditions < 9 °C.


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