Corrosion Preventatives

Castrol Rustilo 637

Neat corrosion preventive oil


Castrol Rustilo™ 637 (previously called SafeCoat™ 637) is a general purpose short term inhibited protective oil ideal for
use where solvent based products are unacceptable.


Rustilo 637 is especially recommended in cold rolling mills, rod and wire drawing works. Due to good deep drawing
properties Rustilo 637 is also suitable for the protection of cold rolled vehicle body sheets light forming operations.
Rustilo 637 can also be used as testing liquid for hydraulic equipment as well as leakage testing fluid for gears, pumps
and tanks.

Rustilo 637 can be applied by complete immersion, brushing or spraying.

  • Free of solvent, complies with EC Solvent Directive (1999/13/EC).
  • Heavy metals free, (example Barium) which may help you to fulfil aspects of legislative requirements and waste
    treatment requirements that specify that these chemicals are excluded.
  • Easy to apply.
  • Contains a corrosion inhibitor package suitable for moderate conditions which provides reliable protection of
  • Compatible with mineral oil.
  • The film does not harden even long after the product has been applied.
  • If required protective films of Rustilo 637 can be easily removed by using a petroleum solvent or alkaline process
    cleaner, all available from Castrol.

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.
(*) “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, which is reversible and doesn’t have an impact on product

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 SafeCoat™ 637. The name was changed in 2015.

Castrol Rustilo 637 Rust Preventative Lubricant Oil

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