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A Guide to Glycols

Under normal conditions, propylene glycol and its homologs set to glass-like solids, rather than freezing. The addition of water to a glycol yields a solution with a freezing point below that of water. This has led to the extensive use of glycol-water solutions as cooling media at temperatures appreciably below the freezing point of water.

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Freezing Points of Glycerol and Its Aqueous Solutions

Thermodynamic Investigation of the Effect of Interface Curvature on the Solid–Liquid Equilibrium and Eutectic Point of Binary Mixtures. The Journal of Physical Chemistry B 2017, 121 (40), 9452-9462. DOI: 10.1021/acs.jpcb.7b07271.

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Burst Protection Versus Freeze Protection

its freezing point; a 40% solution undergoes less than 1% expansion at -31F, or 22 below its freezing point. ( More concentrated glycol solutions (50% glycol) may not see any expansion upon freezing.) It is the differential between the freezing point and the tempera-ture at which the expansion occurs that

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Glycol Heat

Glycol Heat-Transfer Fluids Ethylene Glycol versus Propylene Glycol Water is probably the most efficent heat-transfer fluid known. If it did not freeze, water would be the ideal heat-transfer fluid for cooling applications. When freeze conditions exist (35 F), ethylene glycol and propylene glycol can be added to water to provide

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PROPYLENE GLYCOL PPG

PROPYLENE GLYCOL PPG CAUTIONARY RESPONSE INFORMATION Common Synonyms Thick liquid Colorless Odorless Mixes with water. 1,2-Dihydroxypropane Methylethylene glycol 1,2-Propanediol Keep people away. Call fire department. Notify local health and pollution control agencies. Protect water intakes. Fire Combustible.

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Anti

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.

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Propylene Glycol

Specifically, a mixture of 60% Propylene Glycol and 40% water freezes at −45C (−49F). It is used as a de-icing fluid for windshields and aircraft. The antifreeze capabilities of Propylene Glycol have made it a component of vitrification (anticrystallization) mixtures for low-temperature preservation of biological tissues and organs.

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What Is Glycol? How is it Used in a Chiller?

The freezing point of a 60/40 ethylene glycol/water mixture is much lower than that of either pure ethylene glycol or pure water. Mixtures of propylene glycol with water follow a similar pattern, with a 60/40 mixture of propylene glycol with water having a freezing point of -48 C (-55 F). The low freezing points of glycol mixtures make them

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How does glycol keep a closed loop water system from freezing?

Aug 29, 2019Pure water freezes at 32 F, but a 60% solution of DOWFROST propylene glycol pushes the freezing point down to -60 F. While the freezing point of pure glycol is only -39 F, the synergy between glycol and water results in a much lower freezing point. This is very important for closed-loop systems that may be exposed to freezing conditions.

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Freezing Points of Ethylene Glycol Mixtures

-40 For optimum cooling, it's best to use the smallest proportion of anti-freeze commensurate with your local temperatures and block materials. 10%-20% of anti-freeze will help prevent internal corrosion, especially when using an aluminum block or heads.

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Technical Data Propylene Glycol

Technical Data Propylene Glycol Boiling Point of Aqueous Propylene Glycol Solutions Boiling Point Chart Boiling Point of Propylene Glycol/Water Mixtures 200 190 180 170 160 150 140 130 120 110 100 0 10 20 30 40 50 60 70 80 90 100 % PG in Water Source: Glycols. Curme and Johnston, Reinhold Publishing Corp., New York (1952).

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Technical Data Propylene Glycol

Viscosity of Aqueous Propylene Glycol Solutions Source: Glycols. Curme and Johnston, Reinhold Publishing Corp., New York (1952). Before using a product sold by a company of the LyondellBasell family of companies, users should make their own independent

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SUBJECT: PROPER USE OF INHIBITED PROPYLENE GLYCOL #7

CHOOSING THE PROPER GLYCOL: For getting the most efficiency from your system, a propylene glycol such as "DowFrost" is a must. DowFrost contains special corrosion inhibitors for low system maintenance and better transfer capabilities than normal glycols. It also has a much longer fluid life up, to 20 years in some cases. USE OF PLAIN GLYCOL:

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Material Safety Data Sheet

Chronic ingestion may cause lactic acidosis and possible seizures. Exposures to propylene glycol having no adverse effects on the mother should have no effect on the fetus. Birth defects are unlikely. In animal studies, propylene glycol has been shown not to interfere with reproduction.

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SAFETY DATA SHEET

Propylene glycol 10 mg/m (AIHA N/Av N/Av N/Av WEEL) *Note: The ACGIH TLV listed above for Propylene glycol is an AIHA WEEL. Exposure controls Ventilation and engineering measures: Use in a well-ventilated area. Use general or local exhaust ventilation to maintain air concentrations below recommended exposure limits.

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Safety Data Sheet (PROPYLENE GLYCOL 50%)

Safety Data Sheet (PROPYLENE GLYCOL 50%) PAGE 2 of 9 P501: Dispose of contents/container: Treatment, storage, transportation and disposal must be in accordance with Federal, State/Provincial and Local Regulations. Regulations may vary in different locations.

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Triethylene Glycol

Figure 1 Freezing Points of Aqueous Triethylene Glycol Solutions . . . . . . . 9 Figure 2 Boiling Points vs . Freezing Point Depression • Heat transfer fluids Table 1 Applications. 3 Introduction Carbon Tetrachloride 40 6 Castor Oil 0 3 Cellulose Acetate Completely Soluble

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Colligative Properties

These colligative properties include vapor pressure lowering, boiling point elevation, freezing point depression, and osmotic pressure. This small set of properties is of central importance to many natural phenomena and technological applications, as will be described in this module.

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propylene glycol instead of water

Jan 18, 2016This is true for ethylene (?) glycol, the stuff for cars, and I suspect it applies to propylene, too. Your best protection (lowest freeze point) is w/ a 67% glycol/33% water mix. Not that your slab is going to get to -70 F or anything, but just for general knowledge

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What Temperature Is the Boiling Point for Antifreeze

A mixture of 70 percent ethylene glycol and 30 percent water has a boiling point of 235 degrees Fahrenheit. Coolant should be about 200 degrees Fahrenheit for engines to run optimally. A less-common type of antifreeze contains propylene glycol instead of ethylene glycol. This type has a boiling point of 370.8 degrees Fahrenheit.

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How to Test Ethylene Propylene Glycol

Use CoolTrak coolant test strips (kimdon) to test a sample of ethylene or propylene glycol based coolants. Dip the strip in the test substance to indicate the boiling point, freezing point and PH. Both the U.S. military and the U.S. postal service have used this methodology for testing the antifreeze of

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A Comparison of Ethylene Glycol and Propylene Glycol Heat

the freezing point. The freezing points of these ethylene glycol fluids go through a minimum and thus give maximum freeze protection at a concentration of about 65% ethylene glycol. Propylene glycol, on the other hand, does not exhibit this decreasing and increasing freezing point curve. As propylene glycol is added to water, the freezing

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Glycerol to Propylene Glycol

Propylene glycol (also called 1,2-propanediol) is an incredibly versatile compound that is used in a number of industrial applications that range from transportation andconstruction to food and pharmaceutical production. Pharmaceutical (USP) grade propylene glycol is at least 99.5% pure by weight and is used in health-sensitive

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freezing point in chemistry?

Jun 26, 20081) When 18 g of ethylene glycol C2H6O2 is dissolved in 150 g of pure water, the freezing point of the solution is_____C. (The freezing point depression constant for water is 186C kgmol. 2) When 0.500 g of an unknown compound was dissolved in 15.0 g benzene, the freezing point depression was determined to be 0320C. The molar mass of the unknown compound is _____ g/mol.

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Glycols Freez

concentrations of Freez-Kontr'l versus freezing points. Refer to Figure 1 for a complete list of concentrations of Freez-Kontr'l versus freezing points and boiling points. Figure 2 presents similar data in a chart. Corrosion Protection Freez-Kontr'l contains the best available corrosion inhibitor package for use with propylene glycol.

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Can we use glycols in natural cosmetics?

Propylene glycol (PG) is the next molecule with 3 carbon atoms This molecule is ubiquitous and you can find it almost everywhere from mouthwash and toothpaste to ice cream, food, beverages, industrial cleaners and anti-freeze (that might sound eeky to have a bit of anti-freeze in

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Propylene Glycol IP/ USP/ FR chemical for cosmetics

Propylene Glycol freezes at about −12C (10.4F), but when mixed with water, the mixture does not readily crystallize, and therefore the freezing point of the mixture is depressed. Specifically, a mixture of 60% Propylene Glycol and 40% water freezes at −45C (−49F).

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Product Information DOWFROST

DOWFROST Heat Transfer Fluid Composition (% by weight) Propylene Glycol 96 Performance Additives 4 Color Colorless Specific Gravity 15/15C (60/60F) 1.050–1.060 pH of Solution (50% glycol) 9.0–10.0 Reserve Alkalinity (min.) 10.0 ml. † Typical properties, not to be construed as specifications.

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Technical Data Propylene Glycol

Propylene Glycol. Boiling Point of Aqueous Propylene Glycol Solutions. Boiling Point Chart. Boiling Point of Propylene Glycol/Water Mixtures. 200 190 180 170 160 150 140 130 120 110 100 0 10 20 30 40 50 60 70 80 90 100. % PG in Water. Source: Glycols. Curme

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Safety Data Sheet (40% ETHYLENE GLYCOL 60% DI HO)

(40% ETHYLENE GLYCOL 60% DI H 2O) PAGE 2 of 10 P501: Dispose of contents/container: Treatment, storage, transportation and disposal must be in accordance with Federal, State/Provincial and Local Regulations. Regulations may vary in different locations. Characterization and compliance with applicable laws are the responsibility solely of the

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