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Schultz® S740 (Vapor/Liquid)
54°F – 750°F

SCHULTZ® S740 is a vapor/liquid dual-use high-temperature synthetic heat transfer fluid with a high degree of heat stability. It can be applied at very high temperatures. It is wildly used globally in concentrated solar power (CSP) generation and its accurate control of the gas temperature is utilized in the chemical fiber industry.

Performance Benefits

SCHULTZ® S740 is a vapor/liquid phase high-temperature synthetic heat transfer fluid with extremely high heat stability. It can be applied at extremely high temperatures in the vapor phase state.

Excellent Heat Stability – SCHULTZ® S740 has excellent heat stability and can provide reliable long-term operation within the temperature range of 12–400°C. It is currently the heat transfer fluid with best heat stability performance. Therefore, it is wildly used in concentrated solar power (CSP).

Vapor/Liquid Phase Use – SCHULTZ® S740 is suitable for liquid-phase heating systems with a temperature range of 12–400°C or for vapor-phase heating systems with a temperature range of 257–400°C. SCHULTZ® S740 has lower vapor pressure at high temperatures and its saturated vapor pressure in 400°C is only 1.06 MPa

Good Temperature Control Properties – When SCHULTZ® S740 is in the vapor phase, it has precise temperature control properties; it is wildly used in systems that have a high requirement of precise temperature control such as melt spinning of polyester fibers.

Low-Temperature Properties – The crystallization point of SCHULTZ® S740 is 12°C, and it has lower viscosity even when used at low temperatures. However, certain measures should be taken at low temperatures to prevent the crystallization of S740 from troubling the heating system.

Toxicity and Corrosivity – SCHULTZ® S740 includes independently developed low-sulfur and low-chloride raw additives, which can reduce the toxicity and corrosivity of the heat transfer fluid effectively.

Product Typical Properties – SCHULTZ S740 (Biphenyl and diphenyl oxide)

Appearance Clear transparent liquid
Component Biphenyl/diphenyl oxidemixture
Moisture Content / (mg/kg) 114
Flash Point / °C  118
Auto Ignition Temperature / °C  600
Crystallization point / ℃ 12
Density (20°C) (kg/m3)  1063
Total Acidity / KOH (mg/g)  0.01
Carbon Residue %  0.01
Sulfur Content / (mg/kg)  3
Chlorine Content / (mg/kg)  4
Kinematic Viscosity (mm2 /s) 40°C  2.5
Kinematic Viscosity (mm2 /s) 100°C  0.99
Coefficient of Thermal Expansion (200℃) / ℃  0.000979
Volume Contraction upon Freezing / %  6.27
Volume Contraction upon Melting / %  6.69
Normal Boiling Point / ℃  257
Average Molecular Weight  166
Surface Tension in Air (25℃) / (mN/m)  36.6
Resistivity (20℃) / (Ω•cm)  6.4×1011
Heat of Melting / (kJ/kg)  97.3
Heat of Vaporization (400℃) / ( kJ/kg)  206
Pseudocritical Temperature / ℃  499
Pseudocritical Pressure / bar  33
Pseudocritical Density / (kg/m3)  327
Optimal Applicable Temperature Range / ℃ Liquid  12-400
Optimal Applicable Temperature Range / ℃ Vapor  257-400
Maximum Operation Temperature / ℃  400
Maximum Liquid Film Temperature / ℃  430


Note: The above data are based upon test samples in laboratory, and not guaranteed for all products.
For full specifications of SCHULTZ® S740, please contact our sales dept.

Chemical Industry, Coal Chemical Industry, New Energy, Oil and Gas Processing, Synthetic Fiber Processing and Manufacturing

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