How to Choose High-Temperature Silicone Oil: A 200

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News > Dynamic industry > How to Choose High-Temperature Silicone Oil: A 200–300°C Guide

How to Choose High-Temperature Silicone Oil: A 200–300°C Guide

If silicone oil turns black, thickens or forms carbon deposits after only a few days, the problem may be product selection rather than temperature alone. A stated “maximum temperature” may refer to short-term use or a closed system—not continuous operation in air.

Silicone oils resist heat because their Si–O backbone has a bond energy of approximately 452 kJ/mol, higher than the roughly 347 kJ/mol of C–C bonds. However, side groups determine the practical temperature limit.

Methyl silicone oil (PDMS) offers good thermal stability, but prolonged exposure to air near 200°C can cause oxidation. Phenyl silicone oil generally provides better high-temperature stability because phenyl groups modify intermolecular forces and thermal degradation behaviour.

Selection by Temperature

Around 200°C: IOTA BJ100

Suitable for heat transfer, pressure transmission and dielectric fluids.

Viscosity at 25°C: 100–150 mm²/s
Flash point: approximately 260°C
Volatility at 250°C for two hours: <1.5%
Dielectric strength: approximately 20 kV/mm
Recommended range: −35 to 200°C

BJ100 combines heat resistance with electrical insulation, making it suitable for capacitors and transformers.

Around 280°C: IOTA BJ400

Suitable for high-temperature heat transfer, release and lubrication where a thicker oil film is required.

Viscosity at 25°C: 400–450 mm²/s
Density: 1.073 g/cm³
Flash point: 300°C
Stated range: −30 to 280°C

Confirm whether 280°C is a continuous temperature or only a short-term peak.

Around 300°C: BJ550 or IOTA255-500

IOTA BJ550

Viscosity: approximately 125 mm²/s
Flash point: 300°C
Pour point: −50°C
Open-system range: −40 to 230°C
Closed-system range: −40 to 315°C

BJ550 provides good flow and wide-temperature performance. Its 315°C rating applies to suitable closed systems—not continuous operation in open air.

IOTA255-500

Viscosity: 450–500 mm²/s
Flash point: 300°C
Refractive index: 1.495–1.505
Stated range: −30 to 300°C

Its higher viscosity is suitable for thicker lubricating films and high-viscosity heat-transfer applications. It may be evaluated as an alternative for AP-500 or TSF433 applications, but replacement must be confirmed through testing.

Key Selection Rules

Distinguish continuous temperature from short-term peak temperature.
Confirm whether the system is open, closed or protected by inert gas.
Do not treat flash point as the maximum service temperature.
Lower viscosity improves circulation and heat transfer; higher viscosity provides a thicker lubricating film.
Acids, alkalis, water, mineral oil, metal salts and metal oxides can accelerate degradation.
For 350–400°C, consider a customised fluid or redesign of the heat-transfer system.

Quick guide: choose BJ100 around 200°C, BJ400 around 280°C, and BJ550 or IOTA255-500 for suitable 300°C applications.

For complete TDS documents or sample testing, visit www.siliconeoil.net or contact Iota Silicone Oil Anhui Co., Ltd. Select by temperature duration, system type, viscosity and application—not by the maximum-temperature claim alone.

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