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[7] [22] Water-propylene glycol mixtures dyed pink to indicate the mixture is relatively nontoxic are sold under the name of RV or marine antifreeze. Propylene glycol is frequently used as a substitute for ethylene glycol in low toxicity, environmentally friendly automotive antifreeze.
Propylene glycol. Propylene glycol is considerably less toxic than ethylene glycol and may be labeled as "non-toxic antifreeze". It is used as antifreeze where ethylene glycol would be inappropriate, such as in food-processing systems or in water pipes in homes where incidental ingestion may be possible.
The heating element in a hydronic system is a closed-loop tubing or modular thermapanel system made of a flexible polymer or synthetic rubber that circulates a mixture of hot water and propylene glycol (antifreeze). The fluid is warmed to temperatures of 16 °C (61 °F) to 60 °C (140 °F) to warm surrounding concrete/asphalt/concrete pavers ...
Conventional cryoprotectants are glycols (alcohols containing at least two hydroxyl groups), such as ethylene glycol [citation needed], propylene glycol and glycerol. Ethylene glycol is commonly used as automobile antifreeze; while propylene glycol has been used to reduce ice formation in ice cream.
A heat transfer fluid, usually water or water mixed with antifreeze (propylene glycol, ethanol or methanol), is circulated through this pipe, warming or cooling to the temperature of the earth or rock around it. In open loop systems the pipe draws water from a well, lake or pond.
Examples include ethane-1,2-diol or ethylene glycol HO−(CH 2) 2 −OH, a common ingredient of antifreeze products. Another example is propane-1,2-diol, or alpha propylene glycol, HO−CH 2 −CH(OH)−CH 3, used in the food and medicine industry, as well as a relatively non-poisonous antifreeze product.
The bird flu outbreak has taken concerning turns, with more than 60 human cases confirmed. Experts outlined four signs that the virus is going in the wrong direction.
Mono-ethylene glycol: Often used in a mixture with water to lower the freezing point for use in colder climates. Propylene glycol: Preferred in food production and other industries where toxicity might be a concern. Silicone oil: Used for its stability at high temperatures and electrical insulating properties.
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