Castrol Hysol Series: High-Performance cutting fluids for Multi-Metal Precision Machining
Overview
One Series. Multiple Solutions. Maximum Compatibility.
Built for machinists who run complex, multi-material operations, the Castrol Hysol Series offers long-life coolants that deliver stable emulsions, strong tramp-oil rejection, and excellent resistance to bacterial growth.
Across our products, Castrol Hysol series maintains consistent pH stability, reduces foaming, and increases sump life, helping operators reduce interruptions and maintain cleaner machines.
The result:
- Improved tool life
- Efficient machining
- Cleaner sumps
- Lower operational costs
- High operator acceptance
Product Details
Discover the Capabilities of Castrol’s Hysol Series Products
| Product | Mineral Oil % | pH (5%) | Appearance | Emulsion (%) | Material Suitability | Key Applications |
| Hysol SL 20 XBB | 20 | 9.8 | Translucent | 4–10 | CI, Low-alloy steel, Non-ferrous | Grinding & machining of low-carbon steel and cast iron; MEA/boron-free. |
| Hysol SL 35 XBB | 35 | 9.6 | Milky | 4–10 | CI, Low/Med/High-alloy steel, Titanium, Nickel, Non-ferrous | Precision machining of cast iron and low-alloy steel. |
| Hysol SL 45 XBB | 45 | 9.4 | Milky | 4–10 | CI, Steel, Aluminium, Titanium, Nickel, Non-ferrous | Multi-metal machining; aerospace-approved (Meets AMS-1260-20B). |
| Hysol 3505 | 28 | 9.4 | Translucent | 4–8 | Steel, CI, Aluminium, Non-ferrous | Machining of special steels & cast iron |
| Hysol EP 690 | 44 | 9 | Translucent | 4–10 | CI, Steel, Aluminium, Titanium, Nickel, Non-ferrous | Heavy-duty machining; drilling, milling, grinding. |
| Hysol G 100 | 100 | 9.1 | Translucent | 3–6 | CI, Steel, Aluminium, Titanium, Non-ferrous | General-purpose grinding & light/medium machining. |
| Hysol MB 50 | 50 | 9.7 | Milky | 5–10 | CI, Steel, Aluminium, Titanium, Nickel, Non-ferrous | For medium–heavy machining; Mult-metallurgy machining operations. |
| Hysol T 15 I | 24 | 9.4 | Translucent | 4–15 | CI, Steel, Aluminium, Nickel, Non-ferrous | For grinding & medium-duty machining. |
Key Benefits at a Glance
Why Manufacturers Trust the Castrol Hysol Series
- Long fluid life that reduces maintenance, interventions and downtime
- Excellent corrosion protection to safeguard tools and finished components
- Resilient additive technology ensures pH stability and strong resistance to bacterial growth
- Outstanding tramp-oil rejection, improving sump life and reducing foul odours
- Low-foam formulation for stable machining across water qualities
- Stable, translucent emulsions with mild odour and high operator acceptance
- Designed for multi-metal shops, support machining steel, aluminium, stainless steel, and more
- Reduced scrap & rework through consistent surface finish
- Cleaner machines and better visibility due to controlled residue formation
Castrol HYSOL XBB SERIES
Advanced boron-free, formaldehyde-free technology for extreme bio-stability and long life.
- XBB Technology stabilises pH
- Eliminates the need for frequent top-ups or biocide additions
- Outstanding corrosion protection
- Long sump life
- High cleanliness and low foam
- Suitable for CNC machining, milling, drilling, tapping, reaming and grinding
- Excellent multi-metal compatibility (steel, cast iron, stainless steel, aluminium)
Application Compatibility
Built for Multi-Metal Machining
The Hysol Series supports a wide range of machining operations:
| Operation | Cast Iron | Low-Med Alloy Steel | Stainless Steel | Aluminum | Titanium | Yellow Metals |
| Grinding | ✓ | ✓ | ✓* | ✓* | — | ✓* |
| Milling / Turning | ✓ | ✓ | ✓ | ✓ | ✓* | ✓ |
| Drilling | ✓ | ✓ | ✓ | ✓ | ✓* | ✓ |
| Reaming | ✓ | ✓ | ✓ | ✓ | ✓* | ✓ |
| Tapping | ✓ | ✓ | ✓ | ✓ | ✓ | ✓ |
* Compatibility may vary by grade, consult your Castrol representative.
Storage Information
Keep It Stable. Keep It Effective.
- Store indoors between 5°C and 45°C
- Protect from direct sunlight and frost
- Keep containers sealed to avoid contamination
- Always use clean mixing vessels, never galvanized containers
Take the Next Step
Talk to Our Experts or Request a Live Demo
Whether you need high-stability coolants for tough stainless operations or versatile fluids for multi-material shops, the Castrol Hysol® Series is engineered to deliver lasting performance.