Hydraulic Fluids
Product Data
castrol.com/GPS
800 255 4417
May 2025
GPS
Castrol
®
Blue Hydraulic Plus
™
Sundstrand Pump Test (Double Length Stress Test)
A. Conditions: Test run for 450 hours at 180° F. with water (Standard test is run
for 225 hours at 180° F.)
B. E.O.T. Inspection:
1-Bearing plate - Good Condition
2-rust plate - Good Condition
3-Piston Shoes - Good Condition
4-Distress on other parts - None
C. Assessment: Pass double length stress test.
Industry Specifications and OEM Approvals by Grade:
• Denison HF-O, HF-1, HF-2 approved
• Vickers 35VQ25A meets performance requirements
• Vickers M-2950-S Mobile Hydraulic Systems and I-286-S Industrial Hydraulic Systems
• Cincinnati Machine P-68 (ISO 32), P-70 (ISO 46) and P-69 (ISO 68) approved
• Meets Racine S106
• Meets Joy Mining Machinery HO-T (AW 46), HO-S (AW 68)
• Meets DIN 51524 Requirements
Typical Analysis
ISO Grade Method 32 46 68 100
Former Grade (Light) (10) (20) (30)
Viscosity @40°C, cSt ASTM D445 33.8 45.3 68.2 105.7
Viscosity @100°C, cSt ASTM D445 5.5 6.6 8.7 11.7
Viscosity @100° F, SUS ASTM D2161 160 215 319 551
Viscosity @210° F, SUS ASTM D2161 44 48 54 65
Viscosity Index ASTM D2270 103 103 105 102
Flash Point, °C (°F) ASTM D92 210 (411) 215 (420) 226 (440) 226 (440)
Pour Point, °C (°F) ASTM D97 -32 (-26) -26 (-15) -26 (-15) -15 (+5)
Oxidation Life, ASTM D943 6000+ 5000+ 5000+ 4000+
(Hours to TAN 2.0)
Gravity, API ASTM D287 34 32 29.5 28
Pounds per Gallon ASTM D287 7.12 7.21 7.32 7.39
Specific Gravity ASTM D-1298 0.857 0.863 0.879 0.88
@60F g/ml
C23
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