Castrol Hysol MB 50 is a high performance, water-miscible metalworking fluid formulated without chlorine and without formaldehyde-releasing agents. Its advanced additive package helps deliver excellent machining performance, extended sump life and outstanding surface finish.
The fluid is suitable for central systems and individual machines, offering very good bio-resistance, controlled foam and reliable corrosion protection.
Recommended ConcentrationsGrinding 5-7%
General Machining 5-8%
Drilling 6-8%
Reaming and tapping 7-10%
Broaching 8-10%
Water range
100-1000 ppm CaCO3
FAQ – Frequently Asked Questions about Castrol HYSOL MB 50
Which materials is HYSOL MB 50 suitable for?
It is primarily formulated for steels, alloyed steels and cast iron and may also be used on selected non-ferrous materials.
Can it be used in central coolant supply systems?
Yes, it is suitable for both individual sumps and central systems, offering long-term fluid stability.
Is HYSOL MB 50 free from boron and formaldehyde-releasers?
Yes, it is boron-free and contains no formaldehyde-releasing agents, supporting current HSE standards.
What concentration range is recommended?
Typical working range is 4–10 %, depending on machining severity and tool loading.
What is the recommended water hardness?
Medium to high hardness (approx. 10–30 °dH) is preferred for best performance and foam control.
