Both ethylene and propylene glycol possess many characteristics that make them ideal for use in heat transfer systems where protection from freezing is required. Desirable properties include high boiling points, low freezing points, stability over a wide range of temperatures, and high specific heats and thermal conductivities. Furthermore, used with an appropriate inhibitor, glycols demonstrate a non-corrosivity that may substantially prolong system life. Ethylene glycol based solutions work well in most anti-freeze applications because of their excellent heat transfer efficiency. The low viscosity of ethylene glycol allows systems to operate at lower minimum temperatures and is more energy efficient due to its reduced pumping requirements. The primary drawback to ethylene glycol is that it is listed as a "toxic chemical" under SARA, Title III, Section 313, due to its acute oral toxicity. Inhibited propylene glycol should be used for freeze protection where direct contact with foodstuffs or incidental contact with drinking water may occur. Although propylene glycol is generally recognized as safe (GRAS) by the FDA, it is not intended for human consumption. Hope this helps your question.
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A mixture with at least 30% glycol will prevent freezing in most typical applications. The exact percentage needed can vary depending on the specific conditions and requirements of the system. Typically, a higher percentage of glycol is used for lower temperature protection.
The majority ethnic group in Chile is made up of people of mixed European and indigenous descent, known as Mestizos. They make up about 90% of the country's population.
Most nations have mixed economies, where both the government and the private sector play a role in economic decision-making. In these economies, elements of both capitalism and socialism are present.
The mixed number for ten sevenths is 1 3/7. This means there is 1 whole number and 3/7 left over.
During the "Apartheid" era until 1994, white South Africans owned approximately 80% of the country while only being 15-20% of the total population. South Africa is still today, the leading producer of food in Africa and is also the only country in Africa which can feed itself.
In 1787, approximately 90-95% of the non-Native American inhabitants of the thirteen states were of European ancestry. Native Americans, African Americans, and individuals of mixed ancestry made up the remaining 5-10%.