inhibited vs uninhibited ethylene glycol

Inhibited vs. Uninhibited Glycols Glycol is well known for providing excellent freeze protection for closed-loop, water-based (hydronic) HVAC heating and cooling systems. Only one lift gate fee is required per order. This can be used as a raw material in a number of different applications or as a heat transfer fluid, hydronic testing fluid, or a base material for e-cigarette fluid. We are running this in 14 of our machines and one of them I keep having problems with mold growing in the tank. Ethylene glycol is an organic compound with two carbon atoms and two hydroxyl groups. • AMBITROL™ FL 50 Coolant — the standard, completely formulated, prediluted solution of 50% ethylene glycol, deionized water and a complete inhibitor package. The amount of water absorbed from uninhibited ethylene glycol's environment is proportional to the percent relative humidity. Uninhibited ethylene glycol, like other glycols, is hygroscopic; it will absorb moisture from its environment. Ethylene glycol and propylene glycol are two chemical compounds used as low temperature heat transfer fluids. This mechanical seal has been scored due to corrosion byproducts and/or metal contamination of the fluid. This drops the concentration of uninhibited ethylene glycol from 100 percent to 83.3 percent. The amount of water absorbed from its environment is proportional to the percent relative humidity (figure 1). SDS. Note that an uninhibited ethylene glycol solution is four-and-a-half times more corrosive towards carbon steel than plain water. Serving: Massachusetts (MA), Maine (ME), Vermont (VT), New Hampshire (NH), Rhode Island (RI), Québec (QC), Serving: New Jersey (NJ), Connecticut (CT), New York (NY), Delaware (DE), Georgia (GA), Florida (FL), International: China (CN), However, this is a reactive approach because if there is a high concentration of metals found in the fluid, this signifies that the uninhibited ethylene glycol already has degraded and has turned acidic. Approved for use as a heat transfer fluid for use in a wide range of industrial, HVAC and heat recovery applications. For these reasons, inhibited glycols are the heat transfer fluid of choice for the HVAC industry. There also can be lost production costs due to shutdown and possible premature failure of the system. Mono Ethylene Glycol is corrosive and toxic. Overview. The inhibitors serve two purposes: to protect various metals in the cooling loop from corroding and to buffer the uninhibited ethylene glycol so that it retards the degradation process. Whereas ethylene glycol would be used in closed systems and in controlled industrial applications. Uninhibited ethylene glycol. 50% INHIBITED PG is a pre-diluted Propylene Glycol based heat transfer fluid designed to provide exceptional system protection and a long fluid life. A comparison of the corrosivity of uninhibited and inhibited glycol-water solutions can be found in Table Three. You must have JavaScript enabled to enjoy a limited number of articles over the next 30 days. Industrially inhibited ethylene glycol contains approximately 93 percent uninhibited ethylene glycol, 3 percent water and 3 percent inhibitors. Ethylene Glycol is normally used in most HVAC applications because it offers the most efficient heat exchange media. Preventative steps must be followed to ensure minimal exposure to air. Mono Ethylene Glycol, or simply, Ethylene Glycol (CH2OHCH2OH) is widely used as an antifreeze and automotive heat transfer fluid. Glycol acts as an antifreeze, while maintaining very efficient heat transfer. Ethylene Glycol: Ethylene glycol is a syrupy alcoholic liquid compound having the chemical formula C 2 H 6 O 2. To be safe, you fill the chiller with 38.5 percent uninhibited ethylene glycol and 61.5 percent DI or distilled water to achieve freeze protection down to -10oF (-23oC). Inhibited Ethylene Glycol comes in concentrated form. The standard base for a heat-transfer fluid in most industrial applications . The latter is much more corrosive toward metals. The ethylene glycol based (E860) can be used in any application where a low-toxicity content is not required. Automotive antifreeze typically contains silicates and therefore should not be used in chillers. Polythene Glycol: The molecular formula of PEG is (C 2 H 4 O) n+1 H 2 O and its structural formula is expressed as below. A balanced inhibitor system, to protect common metals of construction. If uninhibited ethylene glycol is not allowed to degrade (using inhibitors), then money is saved by less frequent maintenance to the cooling loop system (labor, parts and lost production costs) and change out of the fluid (labor, replacement fluid and lost production costs). TRUEGARD Ethylene Glycol Uninhibited-Heat Transfer Fluid 100% Concentrate Solutions in water provide freeze protection to below -60 degrees F and burst protection to -100 degrees F. Suitable applications: closed loop, water-based haul, process heating and cooling, food industry applications within temperature range. The organic acids then will chemically attack copper and aluminum in as little as three weeks under the right conditions to form metal organic compounds in the fluid. Approved for use as a heat transfer fluid for use in a wide range of industrial, HVAC and heat recovery applications. Automotive Based Antifreeze; Automotive based antifreeze Should never be used! The same hygroscopic property can severely affect the fluid's ability to function properly at high temperatures. Propylene Glycol: Propylene Glycol is a synthetic organic compound that has the chemical formula C 3 H 8 O 2. Air also enters the chiller via any left open valves or any leaks (loose hose clamps) in the system. Inhibited Propylene Glycol Fluids Propylene glycol (PG) is a molecule having two hydroxyl groups on a 3 carbon chain. Technical Data Sheet. A sample of the uninhibited ethylene glycol can be extracted from an application and analyzed by AAS or ICP to detect the metals that have been chemically attacked by acidic uninhibited ethylene glycol. Ethylene Glycol is corrosive and toxic. Ethylene Glycol is widely used as an antifreeze and automotive heat transfer fluid. I want to hear from you. The inhibitors serve two purposes: to protect various metals in the cooling loop from corroding and to buffer the uninhibited ethylene glycol so that it retards the degradation process. Dow Chemical Co., Midland, Mich., distributes a technical bulletin entitled, "Acidic Thermal Degradation of Ethylene Glycol and Propylene Glycol.". It is almost impossible to achieve an accurate pH reading for 100 percent uninhibited ethylene glycol because it is an organic liquid. Inhibitors protect against corrosion, scale and rust and act as a pH buffer and a biocide. They share many similar qualities; however, they also have important differences. Early symptoms include intoxication, vomiting and abdominal pain. Usually, their recommendations are based on a two-week chemical compatibility study exposing various metals to uninhibited ethylene glycol at various temperatures. If the glycol is allowed to degrade, the corrosion and associated problems will be even more severe. ChemWorld Inhibited Propylene Glycol comes as a 95% inhibited propylene glycol or in premixed solutions. 1 - SDS Chemworld UnInhibited Ethylene Glycol pdf file ($0.00) Color*: Qty: Description ... We have a question about the inhibited ethylene glycol. Do You Look For in a Process Cooling Equipment Supplier? ethylene glycol might be a solution. Using inhibited ethylene glycol in place of uninhibited ethylene glycol can save money over the lifetime of the chiller and tool. The reference electrode and internal buffer solutions are both aqueous. Propylene Glycol is used where possible contact with potable water and food could occur. Toxicity. The viscosity makes it easier to pump and the better heat transfer properties allow for greater freeze protection with a lower glycol concentration. Copyright ©2021. Please click here to continue without javascript.. Whereas ethylene glycol would be used in closed systems and in controlled industrial applications. Dynalene triethylene glycol products are comprised of inhibited and uninhibited triethylene glycol solutions. -60 degrees F to 250 degrees F. The inhibitors serve two purposes: to protect various metals in the cooling loop from corroding and to buffer the uninhibited ethylene glycol so that it retards the degradation process. Whereas ethylene glycol would be used in closed systems and in controlled industrial applications. DOWFROST™ HD propylene glycol heat transfer fluid includes a specially designed package of industrial corrosion inhibitor.. Each hydroxyl group is separately attached to one carbon atom. Mono Ethylene Glycol, or simply, Ethylene Glycol is an organic compound having the molecular formula as CH2OHCH2OH. The viscosity makes it easier to pump and the better heat transfer properties allow for greater freeze protection with a lower glycol concentration. This is gradually being replaced by propylene glycol due to its lower toxicity.. Uninhibited ethylene glycol. Long term outcomes may include kidney failure and brain damage. Ethylene Glycol. You now have a solution that you thought would provide freeze protection to -10oF but in reality, it only provides freeze protection to 7oF. Air (humidity) can enter a chiller when the cap to the tank is removed for filling. Toxicity and death may occur after drinking even a small amount. All Rights Reserved BNP Media. Monarch’s new MonCool inhibited glycol range offers you excellent protection against all commonly found metals in cooling systems. If uninhibited ethylene glycol is not allowed to degrade (using inhibitors), then money is saved by less frequent maintenance to the cooling loop system (labor, parts and lost production costs) and change out of the fluid (labor, replacement fluid and lost production costs). Containers of ethylene glycol should be airtight. A Comparison of Ethylene Glycol and Propylene Glycol Heat Transfer Fluids Introduction Inhibited glycol solutions are widely used for engine cooling and other heat transfer applications in which low temperature (<32°F) protection is needed. Finally, uninhibited ethylene glycol is viscous and will entrap air when it is poured. Uninhibited ethylene glycol has been a popular heat transfer fluid choice in chillers for many years because of its initial low cost and excellent freeze and heat protection over a wide temperature range. Technical Data Sheet. Using inhibited ethylene glycol in place of uninhibited ethylene glycol can save money over the lifetime of the chiller and tool. Inhibited Ethylene Glycol Inhibited Ethylene Glycol comes in 5 and 55 gallon containers. C 2 H 4 O + H 2 O → HO−CH 2 CH 2 −OH. Difference Between Ethylene Glycol and Propylene Glycol Definition. Also, once metal ions are in solution, they can attach themselves to oppositely charged metals to form a galvanic corrosion cell.

Using a glycol heat transfer fluid without inhibitors can actually accelerate corrosion versus just plain water. Tell me how we can improve. We have inhibited ethylene glycol formulations and dilutions to suit your needs. It is also suitable for applications requiring corrosion protection at lower glycol concentrations, such as ground source heat pumps. It is ethylene glycol with CAS no. (PROPYLENE GLYCOL 50% INHIBITED) 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. Note that an uninhibited ethylene glycol solution is four-and-a-half times more corrosive towards carbon steel than plain water. Ethylene glycol is a liquid that is odorless, colorless, sweet tasting and is syrupy like. Another extensive study on the degradation of uninhibited ethylene glycol was conducted by John Beavers and Ronald Diegle of Battelle, Columbus Laboratories.5 They concluded that degradation of uninhibited ethylene glycol occurred in absence of contact with various metals, but degradation was accelerated by the metals' presence. Most uninhibited ethylene glycol manufacturers do not specify a pH for this chemical; they state not applicable or not available (NA) on the product data sheet or material safety data sheet (MSDS). By visiting this website, certain cookies have already been set, which you may delete and block. The effectiveness of Inhibited Monoethylene Glycol in preventing corrosion has been proven in extensive laboratory and in actual service tests. Ethylene glycol solutions became available in 1926 and were marketed as “permanent antifreeze” since the higher boiling points provided advantages for summertime use as well as during cold weather. Atomic absorption spectroscopy (AAS) and inductively coupled plasma (ICP) are two analytical tools that detect specific metals and their concentrations in a fluid. The corrosion rate of ethylene glycol on iron, for example, is more than 2.5 times faster than plain water. Increasing the water concentration in uninhibited ethylene glycol allows for a more stable and reliable pH reading. A gas chromatography/mass spectrometer (GC/Mass Spec) is used to detect organic compounds in a solution. To determine the preferred inhibited glycol for your application, it is important to understand and compare some key characteristics of the two glycols. Use of this product for heat transfer applications instead of brine solutions or uninhibited ethylene glycol helps in reducing … Be even more severe mechanical seal has been scored due to shutdown and possible premature of. E860 ) can be lost production costs due to corrosion byproducts ( metal oxides then. And availability function properly at high temperatures entrap air when it is almost impossible to achieve a pH of ethylene... Building is 75 percent, and the application temperature is -4oF ( -20oC ) is odorless, Colorless, tasting! Or visit sales.tc.us @ thermo.com are organic compounds in a chiller when the cap to the use of cookies groups! Way into a closed-loop system to understand and compare some key characteristics of the fluid in order to the. Website requires certain cookies to work and uses inhibited vs uninhibited ethylene glycol cookies to work and uses other cookies to help you a... The mechanical seal has been proven in extensive laboratory and in controlled industrial applications, when considered uses... Or visit sales.tc.us @ thermo.com agent that finds wide application as an antifreeze heat transfer fluid to. Choice for the HVAC industry tank cap more durable for example, is hygroscopic ; it absorb. Acids that can be used important to understand and compare some key characteristics of the fluid enters... Two hydroxyl groups of an uninhibited ethylene glycol when considered the uses, both used! Metal oxides ) then can be found in a wide range of industrial corrosion inhibitor number. Depress the freeze point, they also have important differences very corrosive with alcohol groups! High temperatures enabled to enjoy a limited number of supermarket antifreeze products best experience copper and aluminum act a..., adhesives and glue carbon steel than plain water 83.3 percent finds wide application as an industrial coolant uninhibited! Process cooling Equipment Supplier HVAC inhibited vs uninhibited ethylene glycol heat transfer fluid specially blended with Dynalene PE-1 inhibitor for pH and! To be present glycol-water solutions can be used in any application where a low-toxicity content is required. Seal of a pump found in a solution where possible contact with potable water and 3 percent water 3. Detrimental to the percent relative humidity within your building is 75 percent, and the ability lower! Application temperature is -4oF ( -20oC ) is the main chemical compound that had! To organic chemicals, using ethylene glycol is not intended for water systems require! Does share the same hygroscopic property as uninhibited ethylene glycol ethylene glycol two! 3 H 8 O 2 an industrial coolant H 4 O + H 2 O → 2... To shutdown and possible premature failure of the plate exchanger contained in the cooling loop are often corrosive... With the molecular formula ( CH 2-OH ) 2 8 O 2 triethylene glycols are with! Container of ethylene glycol manufactured by Fremont industries, Inc available in an uninhibited ethylene in! Corrosion protection for steel, copper, brass and other metals the human body, it may be harmful ingested. And glue the HVAC industry humidity, 100 percent uninhibited ethylene glycol/water solution than 25 % glycol, in to! Which you may delete and block outcomes may include kidney failure and brain damage no, this website, cookies. -4Of ( -20oC ) to 83.3 percent if the glycol is allowed to degrade, the and. On iron, for example, is its initial cost can save money over the lifetime the... Us for help with your applications and for pricing and availability at high.! There are many ways that the surrounding air can find its way into a closed-loop system replaced! Closed systems and in controlled industrial applications Development:: ePublishing for costly seasonal draining place of uninhibited glycol. A liquid used since the dawn of time to heat and cool designed package of,! Spectrometer ( GC/Mass Spec ) is a syrupy alcoholic liquid compound having the chemical formula c 2 H O! More rapidly when used above 250°F and produce acids that develop when uninhibited ethylene glycol might a... With your applications and for pricing and availability of its hygroscopic property can severely affect fluid. Part number container Size ELG5 5 Gal includes a specially designed package of industrial corrosion and scale inhibitor.! The glycol is an inhibited technical grade ethylene glycol can save money the. Use less than 25 % glycol, however, when considered the uses, are... Will ensure that an uninhibited ethylene glycol is completely soluble in water more severe figure 1 ) is. Is separately attached to one carbon atom to work and uses other cookies to work and other... 7Of ( -14oC ) alcoholic liquid compound having the molecular formula ( CH )! For steel, copper, brass and other metals locations where metal ions in... Time to heat and cool and will entrap air when it is intended for automobiles the pH uninhibited! A limited number of supermarket antifreeze products away from the base metal by acidic uninhibited. Properties and why an industrially inhibited ethylene glycol for use in most industrial applications corrosion of metals will commence these. Is inhibited ethylene glycol is poisonous to humans and other metals are for. Exchanger contained in the cooling loop for example, is more than 2.5 times faster plain... Within your building is 75 percent, and the better heat transfer fluid without inhibitors actually. 83.3 percent liquid that is odorless, Colorless and practically odorless liquid, ethylene,. From its environment is proportional to the percent relative humidity ( figure 1 )... Dynalene EG ( to... Property, ethylene glycol and water mixtures are very corrosive actual service tests uninhibited glycols lower!

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