Duff Science BD Calculators

NOTES ON THE CALCULATORS

The calculator is intended to be a guide in choosing the correct blend of biodiesel with a winterizing agent. Actual results may vary due to:
1. Differing compositions of winterized petroleum diesel
2. Chill factor
3. The type of biodiesel used (results shown are from soybean WVO)
4. Impurities (e.g., water) in the fuel tank or fuel line
5. How well the blend is mixed together
The values obtained in these calculators are from real data measured in the laboratory of Duff Science Co., Inc.
The “Input Blend” 100% biodiesel calculation results vary slightly because each blend type contains a different “best-fit” curve from which the calculator calculates the number. The numbers are +/- 3% in reproducibility.
The minimum “Input Blend” for the synthetic additive is 90% biodiesel. Lower biodiesel blends were not measured because the cost of adding so much synthetic winterizing agent is prohibitively expensive. All other winterizing agent “Input Blends” can be measured throughout the range (0-100%).
The calculated values are based on cloud point, rather than gel point. Gel point is the temperature at which the fuel blend does not freely flow. Cloud point is defined as that temperature in which a precipitate is first seen as the fuel blend is cooled. The rationale for using cloud point is that fuel filters begin to plug up if the temperature is at or below the cloud point. This does not mean that your vehicle will not run. It might even take a couple of months for the filter to plug enough to cause a noticeable problem. However, symptoms may eventually be experienced, such as difficulty in starting the vehicle, hesitation, and stalling, especially going up hills.
Important! For winterization protection, biodiesel is often blended with winterized petroleum diesel. However, if temperatures drop below about 13F, even 100% petroleum diesel may begin to cloud! Therefore, for areas where temperatures drop to the teens or less, it is strongly recommended that a kerosene blend be used instead of a petroleum diesel blend.

Although the numbers are believed to be accurate, Duff Science Co.,
Inc. does not guarantee, expressly or implied, the calculator values.

Terms, Licensing, Trademarks and Disclaimers

The contents and elements that make up this website are the exclusive property of Duff Science Co., Inc.™ Any use, copying, or redistribution of any of the content and/or elements of this website in any form without the expressed, written consent of Duff Science Co., Inc., is strictly forbidden and those doing so may be subject to legal action.

Every effort is made to research, verify and report accurate information and truth in advertising with regards to these products and services. Information and data contained on this website are believed to be true and accurate; however, no guarantees or warrantees are expressed or implied by Duff Science Co., Inc.


DuffScience.com Duff Science Co., Inc is providing these biodiesel calculators to support the biodiesel initiative. We thank all of you that have written emails asking for the calculators to be put back online. Even though we are no longer in business, we will continue to support the biodiesel community with these calulators. If you have any questions on biodiesel, check out this website. Should you have a question/suggestion about the calculators, please send an email to the calculator programmer (DuffScience.com Webmaster), Shawn (shawn@wyattsplace.com).
Duff BioDiesel Blend Calculator	Duff BioDiesel Minimum Temperature Calculator
NOTES ON THE CALCULATORS The calculator is intended to be a guide in choosing the correct blend of biodiesel with a winterizing agent. Actual results may vary due to: Differing compositions of winterized petroleum diesel Chill factor The type of biodiesel used (results shown are from soybean WVO) Impurities (e.g., water) in the fuel tank or fuel line How well the blend is mixed together The values obtained in these calculators are from real data measured in the laboratory of Duff Science Co., Inc. The “Input Blend” 100% biodiesel calculation results vary slightly because each blend type contains a different “best-fit” curve from which the calculator calculates the number. The numbers are +/- 3% in reproducibility. The minimum “Input Blend” for the synthetic additive is 90% biodiesel. Lower biodiesel blends were not measured because the cost of adding so much synthetic winterizing agent is prohibitively expensive. All other winterizing agent “Input Blends” can be measured throughout the range (0-100%). The calculated values are based on cloud point, rather than gel point. Gel point is the temperature at which the fuel blend does not freely flow. Cloud point is defined as that temperature in which a precipitate is first seen as the fuel blend is cooled. The rationale for using cloud point is that fuel filters begin to plug up if the temperature is at or below the cloud point. This does not mean that your vehicle will not run. It might even take a couple of months for the filter to plug enough to cause a noticeable problem. However, symptoms may eventually be experienced, such as difficulty in starting the vehicle, hesitation, and stalling, especially going up hills. Important! For winterization protection, biodiesel is often blended with winterized petroleum diesel. However, if temperatures drop below about 13F, even 100% petroleum diesel may begin to cloud! Therefore, for areas where temperatures drop to the teens or less, it is strongly recommended that a kerosene blend be used instead of a petroleum diesel blend. Although the numbers are believed to be accurate, Duff Science Co., Inc. does not guarantee, expressly or implied, the calculator values. Terms, Licensing, Trademarks and Disclaimers The contents and elements that make up this website are the exclusive property of Duff Science Co., Inc.™ Any use, copying, or redistribution of any of the content and/or elements of this website in any form without the expressed, written consent of Duff Science Co., Inc., is strictly forbidden and those doing so may be subject to legal action. Every effort is made to research, verify and report accurate information and truth in advertising with regards to these products and services. Information and data contained on this website are believed to be true and accurate; however, no guarantees or warrantees are expressed or implied by Duff Science Co., Inc.