Plastics processing

Heat transfer oil for plastics, polymer and styrene applications

Engineers working in plastic, polymer and styrene manufacturing plants will use heat transfer systems for a range of applications such as:

  • MouldingFind out how to choose the right heat transfer oil for plastics production
  • Extrusion
  • Press heating
  • Line tracing
  • Coating rolls
  • Vulcanising

These applications require heat transfer oil with a broad temperature range to ensure maximum efficiency and effective heat transfer.

How do I choose a heat transfer oil?

There are a lot of heat transfer fluids on the market but not all of them are suitable for the plastics industry.

Manufacturers should select a thermal fluid based on its properties, such as thermal stability and heat transfer efficiency, but must also consider the requirements of the system and the end product and the cost of the fluid itself.

Synthetic fluids are often a good choice over mineral oils as they typically give up to 8 times the life and will help extend changeout times, especially in electric types of heaters which are commonly used.

What heat transfer regulations should I follow?

When working with thermal fluids at high temperatures, you should follow the Dangerous Substances and Explosive Atmospheres Regulations (DSEAR) to keep workers safe.

To adhere to these regulations, employers must carry out regular assessments on the fire and explosion risks of any activities involving dangerous substances, including frequent testing and analysis of the condition of thermal fluids.

You should always ensure that you efficiently manage risk, keep the site safe and train all staff on efficiently operating a heat transfer system to comply with regulations and provide a safe working environment for all employees.

What heat transfer oil can I use?

Globaltherm™ heat transfer fluids, by Global Heat Transfer are designed for optimum performance in plastic, polymer and styrene manufacturing applications including press heating, moulding, extrusion and coating rolls.

Globaltherm™ heat transfer fluid works effectively to transfer heat over the complete temperature range specified by your application. These oils have been used extensively in the manufacturing of Polyethylene Terephthalate (PET), nylon, polyester and other synthetic fibres.

This range of thermal oils can be used in both liquid and vapour phase, offering you reliability, versatility and flexibility. Globaltherm™ products also provide the high temperature stability necessary to avoid premature fluid degradation at high operating temperatures.

Globaltherm™ Syntec

Globaltherm™ Syntec is the most popular high temperature liquid phase heat transfer fluid and delivers the highest level of customer satisfaction for plastic, polymer and styrene processing applications.

This fluid operates efficiently in applications requiring temperatures of up to 345 degrees Celsius and can be pumped to -3 degrees Celsius.

Globaltherm™ Omnitech

This heat transfer fluid is a eutectic mixture of biphenyl and diphenyl oxide, which gives the fluid the flexibility to perform in both liquid and vapour phases. It is also interchangeable (for top-up or design purposes) with other similar mix thermal fluids.

Globaltherm™ Omnitech thermal fluid can operate in a temperature range of 15 to 400 degrees Celsius and is excellent for use in heat transfer fluid systems that require precise temperature control.

Globaltherm® L

This is a multi-purpose high performance benzyltoluene heat transfer fluid used in plastic processing.

Globaltherm L is recommended for use in the temperature range from -30 degrees Celsius to 360 degrees Celsius and has low viscosity for excellent heat transfer efficiency.

Globaltherm® S

This non-corrosive thermal fluid is recommended for use in an upper temperature range from 250 degrees Celsius to 350 degrees Celsius in closed loop, non-pressurised heat transfer systems.

Globaltherm™ RP

This heat transfer fluid delivers excellent thermal stability for plastic, polymer and styrene applications ranging in temperature from -20 degrees Celsius to 350 degrees Celsius.

Globaltherm RP™ also has a maximum film temperature of 375 degrees Celsius and a high flash point at 194 degrees Celsius to allow plastics manufacturers to operate a system safely at high temperatures.

Globaltherm™ HF

This thermal oil has the highest flash point in the market so that you can safely operate your system at higher temperatures for longer.

Globaltherm™ HF is an environmentally friendly, non-toxic and non-hazardous fluid that is thermally stable when operating at temperatures ranging from 5 to 338 degrees Celsius.

What other fluids can I use in plastics manufacturing?

Global Heat Transfer also distributes Marlotherm thermal oil for use in plastic, polymer and styrene applications.

Marlotherm SH heat transfer fluid

This fluid is specified for use in closed loop, forced circulation heat transfer systems and operates efficiently in temperatures ranging from -5 to 350 degrees Celsius.

Marlotherm LH

This benzyl aromatic thermal oil is recommended for use in temperatures ranging from -30 to 280 degrees Celsius. Marlotherm LH has great thermal stability and can be used for long periods of time without reducing performance.

How long does a thermal fluid last?

All heat transfer fluids will degrade over time. The rate of degradation is heavily influenced by how frequently the fluid is tested and managed in response to the test results and the analysis of the data.

The degradation process can lead to the formation of carbon, a natural insulator that builds up in the system. This can lead to a lack of flow or the creation of hotspots, which negatively impacts productivity and increases energy costs.

Degradation can also impact fluid viscosity, cause acidic contamination and lead to the formation of light ends that can increase the risk of fire in the presence of an ignition source.

How can I extend fluid life?

Regular thermal fluid analysis can help you to extend the lifespan of your thermal fluid. You should take a closed sample of the fluid every three months to effectively monitor its status.

To ensure the sample is representative and the results are accurate, take the sample when the fluid is hot and circulating. By doing this, you can clearly understand what is happening inside the system and if the fluid is beginning to degrade you can also schedule the appropriate maintenance.

We can provide a complete thermal fluid sampling and analysis service to help extend fluid life. Engineers will regularly collect representative samples and send it to an accredited laboratory to run eleven approved thermal fluid tests to determine fluid condition. We can then issue a full report on findings and provide recommendations.

How do I maintain the system?

As well as the fluid, it is important to regularly inspect the entire heat transfer system to check the condition of the pipework, pressure gauges, gaskets and seals.

Problems with the pipework can cause a leak, which is dangerous for the engineers working on site, and makes the thermal fluid susceptible to ignition if flash points and auto ignition temperatures are reduced and there is an ignition source present.

How can I get help with maintenance?

The best way to maintain a heat transfer system is to implement a preventative maintenance programme.

At Global Heat Transfer we provide a condition based thermal fluid lifecycle maintenance programme, Thermocare. Our expert engineers will work with you to improve accuracy when monitoring fluid, provide technical interventions when necessary, organise maintenance schedules and train staff.

How do I find out more?

Our engineers can help you to find the right heat transfer oils for plastics processing applications.

For more personalised advice, fill in our contact form or call us on +44 (0)1785 760 555.

Globaltherm™ Syntec Heat Transfer Fluid for Plastic, Polymer & Styrene Applications

Product Operating Temperature Bulk 200KG Barrel
Globaltherm™ Syntec

-3°C to 345°C
(27°F to 653°F)

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Globaltherm™ Syntec is the most popular high temperature liquid phase heat transfer fluid and delivers the highest level of customer satisfaction for plastic, polymer & styrene processing applications.


Globaltherm™ Syntec ensures a trouble-free start up under most conditions and is readily pumpable at temperatures as low as -3°C (27°F).

Globaltherm™ Syntec thermal fluid is works with heat transfer system applications operating up to 345°C (653°F) and can be pumped to -3°C (27°F).

Globaltherm™ Syntec is specified for a wide variety of applications, including plastics processing, chemical industries and biodiesel applications and provides efficient performance at 345° C (653°F).

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Globaltherm™ Omnitech Heat Transfer Fluid for Plastic, Polymer & Styrene Applications

Product Operating Temperature (Liquid Phase) Operating Temperature (Vapour Phase) Bulk 200KG Barrel
Globaltherm™ Omnitech

15°C to 400°C
(27°F to 653°F)

257°C to 400°C
(495°F to 750°F)

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Globaltherm™ Omnitech eutectic mixture of biphenyl and diphenyl oxide gives this heat transfer fluid the flexibility to perform in both liquid and vapour phases. It is also interchangeable (for top-up or design purposes) with other similar mix thermal fluids.

Globaltherm™ Omnitech thermal fluid is excellent for use in heat transfer fluid systems which require precise temperature control, due to its ability to operate as a vapour phase heat transfer fluid.

Globaltherm™ Omnitech has low viscosity to 12°C (54°F).

Globaltherm™ Omnitech is a synthetic thermal fluid for use in plastic, polymer and styrene processing and also chemical and concentrated solar power applications for consistent performance.

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Marlotherm® SH Heat Transfer Fluid for Plastic, Polymer & Styrene Applications

Product Operating Temperature Bulk 214KG Barrel
Marlotherm® SH

-5°C to 350°C=
(23°F to 662°F)

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Marlotherm® SH thermal fluid is specified for use in closed loop, forced circulation heat transfer systems. The operating temperature range for Marlotherm® SH is from 250°C (482°F) to 350°C (662°F) and can be used intermittently at film temperatures as high as 380°C (716°F).

Marlotherm® SH can be used in systems that require start-up temperatures as low as -5°C (23°F) without the need for heat tracing and without being pressurised.

Marlotherm® SH thermal fluid is thermally stable up to 300°C (572°F) and can be used for extended periods (years) below this temperature without reducing performance.

Marlotherm® SH has a low viscosity 17 cSt @ 40°C (104°F) with a pumping limit at -5°C (23°F) – making it one of the lowest in its fluid class.


Marlotherm® SH thermal fluid has a flash point of 200°C – one of the highest in its fluid class.

Marlotherm® SH has superior thermal stress resistance in the bulk outlet temperature range from 60°C-350°C (140°F - 662°F) and primary uses are plastics processing and chemical industries.

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Marlotherm® LH Heat Transfer Fluid for Plastic, Polymer & Styrene Applications

Product Operating Temperature Bulk 200KG Barrel
Marlotherm® LH

-30°C to 360°C
(22°F to 680°F)

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Marlotherm® LH is recommended for use in the temperature range from -30°C (-22°F) to 280°C (536° F) and can be used intermittently at film temperatures up to 380°C (716° F). It may also be used in pressurised systems up to 360°C (680°F).

Marlotherm® LH is a high performance thermal fluid that can be used in liquid and vapour form in closed loop, forced circulation heat transfer systems. It can be used in the liquid or liquid/vapour phase due to its narrow boiling range of around 4°C (39°F).

Marlotherm® LH is a benzyl aromatic thermal fluid with excellent thermal stability and a high auto-ignition temperature of 450°C (842°F)

Marlotherm® LH thermal fluid has a low pour point and pumping limit -30°C (-22°F)

Marlotherm® LH thermal fluid is thermally stable up to 300°C (572°F) and can be used for long periods below this temperature without reducing performance

Marlotherm® LH is used predominantly in plastic, polymer and styrene processing and chemical and pharmaceutical applications.

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High Flash Point Diaryl Alkyl Heat Transfer Fluid

Application

Globaltherm® RP Heat transfer fluid is suitable for plastic, polymer and styrene applications.

About Globaltherm® RP

  • Globaltherm® RP delivers excellent thermal stability for plastic, polymer and styrene applications at the maximum use temperature.
  • Globaltherm® RP Heat transfer fluid is recommended for use in plastic, polymer and styrene applications and a temperature range up to a maximum bulk temperature of 350°C (660°F) and a maximum film temperature of 375°C (710°F) with a high flash point at 194°C (381°F).
  • Globaltherm® RP is a diaryl alkyl composition intended for use in plastic, polymer and styrene applications that require liquid phase heat transfer and can be used in non-pressurised systems. Globaltherm® RP can be pumped at 0°C (32°F) and has good low temperature properties, which reduces the need for heat tracing.
  • Globaltherm® RP has a toxicity that is considered to be extremely low and degrades primarily to low molecular weight products, therefore negating build-up of high molecular weight products that must be filtered out of the system.
Product Operating Temperature 200KG Barrel 1000 Litres IBC Bulk
Globaltherm® RP

-20 - 350°C
(-4°F - 660°F)

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RP

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High Flash Point Heat Transfer Fluid

Application

Globaltherm® HF Heat transfer fluid is suitable for processing applications for plastic which require single fluid heating and cooling.

About Globaltherm® HF

  • Globaltherm® HF heat transfer fluid’s flash point is one of the industry’s highest at 276°C (530˚F). Not only does Globaltherm® HF Heat transfer fluid have one of the highest flash points in the market it also delivers trouble-free service for plastic processing applications, when managed correctly, as a result of its resilient blend of additives.
  • Globaltherm® HF Heat transfer fluid is environmentally friendly, non-toxic and non-hazardous and requires no special handling in plastic processing applications. It is a superior high performance, energy efficient heat transfer fluid for plastics processing applications.
  • Globaltherm® HF heat transfer fluid delivers superior resistance to extreme oxidation and sludging found in many manufacturing environments including plastic processing applications.
Product Operating Temperature 1000 Litre IBC 208 Litre Barrel Bulk

Globaltherm® HF

338°C  (640°F) tick tick tick

Parameter HF

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