Ethylene glycol and propylene glycol are chemically similar. Ethylene glycol has the chemical formula C2H6O2. Propylene has the chemical formula C3H8O2. Ethylene glycol has a slightly higher boiling point than propylene glycol. Ethylene glycol is less expensive to produce and is more widely used. Propylene glycol is less toxic. Both propylene glycol and ethylene glycol have similar biodegradability and will eventually break down into nontoxic byproducts.

Propylene glycol is much different than ethylene glycol. The term "glycol" actually refers to organic chemical structures that contain twin hydroxyl groups on neighboring carbon atoms. This common functional group is present in many different kinds of molecules. For example, all food carbohydrates contain glycol groups. Ethylene glycol is a toxic glycol used extensively in aqueous cooling systems (such as automotive "antifreeze" to prevent freezing in cold weather).

from cosmetics and household detergents to paints and automotive brake fluids." http://www.dow.com/propyleneglycol/index.htm Incomplete evaluations do not mean that a chemical is free from "human carcinogenic potential." -- barb

Tell your supplier to include corrosion inhibitors to protect copper and iron. Also, make sure they add a colorant to the glycol so that any leakage/spillage can be detected.

PG is available (though often only by special order from any full-service Pharmacist. The cost varies from $5 to $8 per pint. Pharmacologically, it's used as a solvent for oral and injectable drugs.... It also has many uses as a chemical solvent, as well as being used in many cosmetics. PG is also available from many feed-stores, as it is used as a feed additive and a medical treatment for livestock.

The results will be less than 1 color block conservative. Ethylene Glycol provides slightly higher freeze protection at like concentrations, and therefore contributes to a lower freeze point protection. Differences of less than 1 color block will result.

Ethylene glycol and propylene glycol are chemically very similar and can be mixed without harming the cooling system. Ethylene glycol does have better heat transfer properties than propylene glycol. Adding propylene glycol does not make the ethylene glycol less toxic. No, it is never OK to neglect cooling system maintenance. Scale buildup and corrosion in radiators, for example, can cause overheating problems or radiator failure.

Propylene glycol is an emollient used in many types of medical care products, including those applied to the skin or taken internally. Propylene glycol is found in medical products such as cough syrups and skin care products. It is safe and imparts unique attributes when formulated into such products.

McElroy obtained a series of patents on ethylene glycol manufacture beginning in 1915. The Commercial Research Company developed the process to produce ethylene glycol to a semi commercial scale in 1917 and continued operation in Flushing, LI until 1920. While the use in antifreeze was foreseen at that time, the chief use was in the manufacturing of explosives. Dr Curme Jr.

Propylene glycol enables our deodorants to be applied smoothly in a stick form and helps to stabilize the base of anti-microbial plant ingredients. We have researched glycerin as a substitute, and found that the glycerin acts as a moisture binder that encourages bacterial growth, which causes odor. Earth Science prides itself on making gentle products that are suitable for a wide range of skin types and sensitivities. Many of our loyal customers consider themselves chemically sensitive.

Metso Automation ball valves can be used through out your plant: on ethylene oxide, ethylene glycol, diethylene glycol and sulfuric acid. Of concern of course are the materials of construction and emissions. Metso Automation valves are available in noble alloys such as Alloy 20, and Hastalloy® for these services. Consult Jamesbury Bulletin T101-1 and Bulletin T101-2 for material selection. For emission control consider the Emission-pak™.

You can use Metso Automation valves on the feed side of the furnace and downstream of the quench pot. The valves in the complex fuel system requiring FM approval are most often Jamesbury brand.

Propylene glycol is an ingredient used in numerous cosmetics and toiletries. It is also used as a powerful solvent to prevent creams from drying out. Propylene glycol is a petrochemical derivative and has been shown to cause allergies.

Raw Water Cooled Engines - Propylene glycol RV antifreeze with a rust inhibitor is approved for use in the raw water cooling system for cold weather storage purposes ONLY. Fresh Water Cooled (closed cooled) Engines ? If your engine is equipped with a closed cooling system, you should always use an appropriate mixture of Sierra Brand propylene glycol antifreeze and water in this system. Make sure to check the mixing ratio on the anti-freeze container.

I would like to calibrate a model 402REU with 300ppm benzene. What is the procedure to get the 402R operating correctly with different span gases? (Non-methane)

The results will be less than 1 color block conservative. Ethylene Glycol provides slightly higher freeze protection at like concentrations, and therefore contributes to a lower freeze point protection. Differences of 1 color block will result.

Propylene Glycol, the base fluid of Engine Ice Hi-Performance Coolant TM, meets or exceeds all ASTM, SAE, Government and Manufacturers standards. It also has NO statutes or health warnings from the Clean Air Act Amendments (CAAA), CERCLA (Superfund), Superfund Amendments & Reauthorization Act (SARA), Occupational Health & Safety Administration (OSHA), American Conference of Governmental Industrial Hygienists (ACGIH), Federal Health & Safety Administration (FHSA).

The FDA has approved Antizol for use in adults only; however, there are published reports of Antizol use in children using adult dosing guidelines.