Wintron ® - Biodiesel Cold Flow Additives

The most effective cold flow additives available for biodiesel

Pour point depressants formulated specifically for biodiesel

Markedly improves cold flow properties of biodiesel

Biofuel Systems now offer a range of additives to suit different types of biodiesel

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  • Wintron® additives are mixed with finished biodiesel. The biodiesel should be warm, and must be at least 5°C above the cloud point of the fuel i.e. it should appear clear
- 34°C biodiesel

Photograph courtesy of Celtic Power & Machining Ltd, Manitoba, Canada. Biodiesel (FAME) treated with 0.8% v/v Wintron® XC30 and cold filtered to 1 micron

  • Treat rate varies, and is largely dependent on the feedstock used to produce the biodiesel. Typically treat rate is 0.1% - 2% by volume (i.e. 0.5% would be equivalent to 5 litres of Wintron® additive made up to 1000 litres with biodiesel)
  • Users must determine the required treat rate for their biodiesel
  • Best results are seen with biodiesel produced from unsaturated oils such as Rapeseed oil, Canola oil, Sunflower oil, Soy oil etc. Results with used cooking oil are generally good. Wintron additives are least effective for biodiesel produced from highly saturated feedstocks such as Tallow and Palm oil.
Mechanism of action
  • The Wintron® range of additives are viscosity modifying componds. These compounds achieve their effect by reducing the tendency of viscosity to increase as the fuel is cooled which alters cold temperature crystallisation. The freeze point (FP), pour point (PP) and cold filter plugging point (CFPP) are reduced.
Sample Packs
Find out which Wintron® additive is most effective for your biodiesel...
The exact composition of biodiesel can vary, especially with biodiesel produced from used cooking oils. Users must determine the effectiveness and treat rate for their biodiesel. Sample packs are available which include 1 litre of each additive, information sheets and material safety data sheets (MSDS) Click here to buy a sample pack online
Wintron® X-Series Additives
Wintron® X-Series Additives are blends of Styrene copolymer esters in a Mineral oil and Toluene base. Three additives are available - Wintron® XC30, Wintron® XC40 and Wintron® XC40R  
Wintron® XC30 - Original broad spectrum formulation. Low cost biodiesel pour point depressant (PPD) Effective for biodiesel produced from a wide range of feedstocks.
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Wintron® XC40 - Formulated to be maximally effective for biodiesel produced from predominantly Rapeseed or Soy oil feedstocks - the two most commonly encountered vegetable oils in Europe and North America.
Wintron® XC40 information sheet
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Wintron® XC40R - Highly specific formulation for pure rapeseed oil biodiesel (RME). Achieves dramatic reduction in CFPP, PP and FP with very low treat rate (0.05%-0.3% v/v)
(Wintron® XC40R is currently only available in bulk quantities. Please contact us directly if interested in this product)
  RME with CFPP of -20°C and PP of -38°C can be produced with treat rates as low as 0.3% v/v  
Wintron Synergy®
Wintron Synergy® can be used as a stand alone CFPP depressant for biodiesels produced from Rapeseed oil, Canola oil and used cooking oils. It is more effective than other additives at improving the cold flow properties of biodiesel produced from saturated feedstocks such as tallow and palm oil. Results seen with biodiesel produced from used cooking oils are generally excellent.
Wintron Synergy® information sheet
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Wintron Synergy® has been shown to work synergistically as a pour point depressant with Wintron® X series additives for some types of biodiesel. With additional cold filtration arctic grades of biodesel can be produced  
  Wintron Synergy® is a blend of polymethacrylate compounds in a mineral oil base. It does not contain toluene and is non-hazardous  
Arctic Biodiesel
When biodiesel is cooled below a certain point, some of the molecules aggregate and form crystals. The fuel starts to appear cloudy once the crystals become larger than one quarter of the wavelengths of visible light - this is the cloud point (CP) of the fuel.
As the fuel is cooled further these crystals become larger.

Wintron® additives affect cold temperature crystallisation and reduce the temperature at which these crystals become large enough to block the pores of a fuel filter (CFPP - cold filter plugging point)

Cold filtration
The CFPP and CP can be further lowered by cold filtration of the fuel.


Longer chain saturated biodiesel molecules tend to crystallise first. Although these molecules generally have higher cetane values, the overall cetane value of cold filtered fuel will generally fall well within accepted standards.
Cold filtration will reduce the cloud point of biodiesel and reduce the CFPP and PP of biodiesel to lower temperatures that can be achieved using additives alone
To make ultra cold weather biodiesel it is best to produce the biodiesel from an oil that already has good cold flow characteristics such as Rapeseed oil
  • Mix warm biodiesel with Wintron® additive(s) that maximally reduce pour point of biodiesel.
  • Allow to cool to below the cloud point - the fuel must still be able to flow
  • Filter the biodiesel to 1 micron
CFPP - cold filter plugging point: lowest temperature at which a sample can pass through a filter. Conditions specified by EN116, ASTM D 6371 & IP 309 – the lowest temperature at which a 20ml sample passes through a 45μm wire mesh under 0.0194atm vacuum within 60s

The information provided above is given in good faith but without warranty, and this also applies where proprietary rights of third parties are involved. Any advice provided does not release you from the obligation to check its validity and to test the products as to their suitability for the intended processes and uses. The application, use and processing of this product and the products manufactured by you are beyond our control and, therefore, entirely your own responsibility.

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