Castrol Hysol XB is a water-miscible, semi-synthetic high-performance metalworking fluid designed for demanding machining operations. Its additive package supports high stability, helps improve surface finish and can reduce machining costs.
The product is free of chlorine compounds and does not contain formaldehyde releasers. It is suitable for both central systems and single-machine installations.
Typical applications
- Machining of low- to high-alloy steels
- Depending on the process requirements, also suitable for aluminium alloys
- Can be used for selected aerospace alloys (observe approval requirements)
- Suitable for central coolant systems and individual machines
Typical concentration guidelines (reference values)
- General machining: 4–7%
- Drilling: 6–10%
- Reaming & tapping/threading: 6–10%
- Broaching: 7–12%
- Recommended water hardness range: 3–20 °dH
Benefits
- Free of chlorine compounds; described as chlorine- and nitrite-free
- No formaldehyde releasers
- High stability and bioresistance – supports longer sump life
- Low foaming with recommended water quality
- Good corrosion protection to help protect machines and parts
- Good wetting characteristics – supports clean parts and reduced carry-off
Technical data (excerpt)
- Appearance (concentrate): amber
- Density at 20 °C: 970 kg/m³
- Mineral oil content: 37 wt%
- Emulsion appearance: milky
- pH value (5%): 9.3
- Refractometer factor: 1.1
Additional information
- Additive note (per product data sheet): contains boron / EP-ester / amines; does not contain chlorine or formaldehyde releasers
- Approval: Airbus – EADS ASN 42302
Product Questions & Answers (FAQ)
What is the metalworking fluid used for?
For metal machining of steels and—depending on process requirements—also aluminium alloys and selected aerospace alloys, in central systems or individual machines.
Which concentrations are typically used?
Reference values: 4–7% (general machining), 6–10% (drilling), 6–10% (reaming/tapping), 7–12% (broaching). Always adapt to application, water quality and process.
Is it free of formaldehyde releasers and chlorine?
It does not contain formaldehyde releasers and is free of chlorine compounds; it is also described as chlorine- and nitrite-free.
What water hardness range is it designed for?
The recommended water hardness range is 3–20 °dH.
Is there an aerospace approval?
Per data sheet: Airbus – EADS ASN 42302.
