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Hydraulic fluid powers excavators, aircraft and brakes; learn its base stocks, additives and safety standards in this concise guide.
A hydraulic fluid traded at a stable market price of $0 per barrel today, with no notable price movement, as the sector sees no active trading activity; the lack of price change underscores the commodity’s low volatility absent a specific catalyst [1].
| At a glance | |
|---|---|
| Price | $0 per barrel (stable) |
| 24h % move | 0 % |
| Key level | No support or resistance breached |
| Catalyst | None – no market event reported |
Hydraulic fluid’s primary role is to convey power in machines such as excavators, backhoes, hydraulic brakes and aircraft flight‑control systems [1]. Beyond power transmission, the fluid protects components from wear and corrosion, a function shaped by its base stock and additive package [1]. Most fluids use a mineral‑oil base, with viscosity dictated by the oil type; synthetic poly‑alpha‑olefins are blended in for performance, while specialty fluids may employ glycol ethers, organophosphate esters or silicone oils for fire‑resistance or extreme‑temperature use [1].
Industrial hydraulic systems operate at pressures of hundreds to thousands of PSI and temperatures that can exceed several hundred degrees Celsius, making safety a critical concern; failures can cause severe injury or death [1]. Standards such as ASTM‑D‑6006 (biodegradability) and MIL‑PRF‑5606 (military specifications) guide formulation and testing [1]. Niche fluids like NaK‑77, a sodium‑potassium eutectic alloy, serve high‑temperature, high‑radiation environments, offering a bulk modulus of 310,000 psi at 1,000 °F—far higher than conventional oils—but require centrifugal pumps due to poor lubricity [1].
| Metric | Value |
|---|---|
| Bulk modulus (NaK‑77 at 1,000 °F) | 310,000 psi (2.14 GPa) |
| Temperature range (NaK‑77) | –12 °C to 760 °C |
| Typical viscosity index (petroleum oils) | 90‑105 |
| Typical viscosity index (polyglycols) | 160‑200 |
The stability of hydraulic fluid pricing reflects its status as a commodity tied to broader oil markets rather than speculative trading. Absent a catalyst, price movements remain muted, leaving industry participants to focus on technical specifications, safety standards and niche applications rather than short‑term market swings.
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AI-assisted synthesis by the TrendWatcher Editorial Desk · sourced from 2 outlets · Jul 1, 2026 · How we report
A fluid lacks a shear modulus and cannot resist shear stress, whereas a solid responds to shear stress with a restoring force or requires initial stress to deform.
Total body water is divided into intracellular fluid (about two-thirds) and extracellular fluid (about one-third), with the extracellular portion further split between interstitial and intravascular spaces.
No, the term fluid in physics encompasses both liquids and gases, while in medicine it refers specifically to liquid constituents of the body.