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SunWizard · Posted: Sat Mar 15, 2008 11:36 am Post subject: Comparing different VO types

This chart shows the large variations between VO types and diesel and B100.

Oil_____Iodine Value__CloudPoint_______PourPoint
Corn_____103-140_____-1.1C, 30F_____-40C, -40F
Cottonseed_90-119_____1.7C, 35F_____-15C, 5F
Peanut_____80-106____12.8C, 55F______-7C, 19F
Rapeseed__94-120______-4C, 25F_____-32C, -26F
Canola____94-120______-4C, 25F______-32C, -26F
Safflower__126-152_____18C, 64F_____-6.7C, 19F
HO "_______90-100____-12C, 10F_____-21C, -6F
Soybean___117-143_____-4C, 25F______-12C, 10F
Sunflower__110-143_____7C, 45F______-15C, 5F
Rice Bran___94-120_____13C, 55F
Algae______123________-4C,25F
Diesel#2_____________-15C, 5F______-33C, -27F
B100 (canola)__________1C , 34F_____-2C, 28F

The cloud point is the start of crystal formation in the oil which gives it a cloudy appearance. As the temperature is lowered, the crystals continue to grow until the oil is no longer a fluid but a gel. The temperature at which flow ceases plus 4.5 F is defined as the pour point. The point where your filter will plug (CFPP - cold filter plugging point) is 3C (5F) below the cloud point.

Iodine value affects how fast the VO polymerizes, see:
Polymerization thread.

These numbers will vary even within a type of VO. Interesting that for all VO types, the HO (High Oleic) variety are much better on all the stats. They are close to diesel for cloud point. HO Canola is what they use in VO based motor oil and hydraulic fluids, along with anti-oxidant additives. Which means its the best to burn in your engine if you have a well worn engine and some VO is getting past the rings at startup. They also last much longer in the fryer (some last longer than PHO) and are healthier, so get your restaurants to change if possible.

Also note that these numbers are for new VO, as it gets more well used, the stats get worse, and the cloud point increases.
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John Galt · Joined: 04 Mar 2008 Posts: 431 Location: North of 60°

SunWizard · Posted: Sat Mar 15, 2008 2:44 pm Post subject:

Burbarian · Joined: 05 Mar 2008 Posts: 194 Location: Vermont

What, no values for tallow, lard and suet?!? That's discrimination! The chart was obviously drawn up by a bloody vegetarian! Laughing