A plot of T ad versus F/(F+H) is constructed, with each point representing a refrigerant or blend, as shown in Fig. Question is ⇒ Which of the following refrigerant is highly toxic and flammable?, Options are ⇒ (A) Ammonia, (B) Carbon dioxide, (C) Sulphur dioxide, (D) R-12, … True Refrigeration has some good training materials on R290 such as this video. EPA cannot comment on any specific enforcement actions that it may be undertaking or that are in the early stages of investigation. R-22 (also known as HCFC-22) is an ozone-depleting refrigerant which has been widely used in home air conditioning systems and its supply is now being phased out in response to the Montreal Protocol. Basically, the refrigerant is flammable but it doesn’t burn that fast. The most common toxic refrigerant is Ammonia and you would generally only find it in old appliances or in large industrial applications. Flammable refrigerant alternatives are becoming increasingly viable as global environmental regulations push the HVACR industry toward low-GWP refrigerants. Fluorocarbons, especially chlorofluorocarbons, became commonplace in the 20th century, but they are being phased out because of their ozone depletion … Environmentally safe but highly flammable. Propane (R290) is a flammable refrigerant and it is becoming quite popular in small self-contained refrigeration units like vending machines and reach-in coolers. As we try to decrease the GWP of synthetic blends further, typically by using hydrofluoroolefins (HFO), the result is often a refrigerant that is flammable with an A2L classification. Plus, when you order through my link, it helps me to continue to offer you lots of free stuff. Sulphur dioxide, methyl chloride or isobutane used until a new refrigerant known as chloro fluorocarbons or CFCs, which is the fluoro-chloro derivatives of methane, ethane…, called Freon is introduced to the market. today’s refrigerators using R -600a refrigerant are manufactured. Refrigerants are grouped as A (non-toxic) and B (toxic), with flammability ranked by number from 1 (non-flammable) to 3 (highly flammable). In fact, I oftentimes am able to negotiate a lower rate (or bonuses) not available elsewhere. Many working fluids have been used for such purposes. :) Thank you, in advance for your support! This refrigerant is a highly flammable, colorless gas that is heavier than air. Refrigerant R 600a, or isobutane, is a possible replacement for other refrigerants, which have high impact on the environment, in domestic refrigerators. Click to share on Twitter (Opens in new window), Click to share on Facebook (Opens in new window), Has high latent heat of vaporization (it moves a lot of heat per lb when it boils), Boils and condenses at temperatures we can easily manipulate with compression (the pressures work). These are the units on the side of a house typically referred to as “central air conditioning.”. Mixes with the oil appropriately so that the oil can do the job of lubrication in the compressor as well as return. A refrigerant is a substance or mixture, usually a fluid, used in a heat pump and refrigeration cycle.In most cycles it undergoes phase transitions from a liquid to a gas and back again. The current lists of acceptable refrigerants for use in refrigeration and air conditioning can be found in the Refrigeration and Air Conditioning section. 23% of R32, 25% of R125 and 52% of R134a. And, some flammable next-generation refrigerants are blended with nonflammable refrigerants, much like many of the refrigerant blends we use today. You can find EPA’s lists of acceptable refrigerants for other uses here. In some cases, it may also contain small amounts of other hydrocarbons or a pine-scented odorant. EPA notes that the listings for household and commercial refrigerators and freezers and room air conditioning units  apply only to new equipment that was specifically designed to be used with that refrigerant. These determinations were based on detailed assessments of the risks posed by each flammable refrigerant in the particular application or type of equipment to be used. R600a and R290 are heavier than air and the concentration will always be highest near the floor. Beginning in 2025, chillers will have to use a refrigerant with a GWP less than 750. Thankfully, refrigerants are well marked and so long as we pay attention and follow best practices there shouldn’t be any issues. A3 pure refrigerants that are a single molecule are R-290 (propane), R-600 (butane), R-600a (isobutane), and R-601A (isopentane). Isobutane R-600a is a well-suited refrigerant for household applications with good energy efficiency, but this refrigerant has very different characteristics when compared to R-134a, which means it is not a drop-in replacement for R-134a, especially because R-600a is flammable. Non-hardening, non-drying fluid which bonds tenaciously to many different substrates. The choice of ideal refrigerant is made based on its favorable thermodynamic properties, non-corrosive nature, and safety (non-toxic and non-flammable). R600a must only be stored and transported in approved containers and must be handled according to existing guidelines. 3 refrigerants are highly flammable. For exam-ple, the blend R-410A mixes a flammable refrigerant (R-32, ASHRAE Class 2L) with a nonflammable refriger-ant (R-125, ASHRAE Class 1). These refrigerant types are highly flammable, so careful specialized installation is required. HCFC Refrigerant: HCFC refers to the chemical composition of the refrigerant. Propane (R290) is a flammable refrigerant and it is becoming quite popular in small self-contained refrigeration units like vending machines and reach-in coolers. It has zero ozone depletion potential ODP and a neglectible global warming potential GWP. Using a small amount of a hydrocarbon (HC) refrigerant blended with other refrigerants to improve oil … Blend containing R1234yf Patented blend of R32, R125 an CF31 Flammability Mildly flammable (A2L class) Mildly flammable ... is highly flammable, with a high explosion. R-407C: R407C is a ternary blend of hydrofluorocarbon or HFC compounds. Learn how your comment data is processed. EPA continues to investigate instances where propane-based refrigerants have been marketed and sold as a substitute for R-22 and take enforcement actions where appropriate. In addition, in many instances EPA’s regulations adopt the results of safety reviews by industry standards-setting bodies as mandatory use conditions. The most common toxic refrigerant is Ammonia and you would generally only find it in old appliances or in large industrial applications. It recognizes several flammability classes from nonflammable A1 to highly flammable A3, depending on refrigerant’s LFL value, heat of combustion and maximum burning velocity (Figure 3). This is because the consequences of a loss of containment due to a leak or during servicing and maintenance can be severe, particularly for larger refrigerant quantities. The list of acceptable refrigerants for use in home air conditioning is available at this link: Acceptable Substitutes in Household and Light Commercial Air Conditioning. ASHRAE Standard 34-2016, Designation and Classification It is considered mildly flammable and labeled with an ASHRAE A2L safety classification. Queensland hydrocarbon refrigerants legislation While all refrigerant gases are regulated as hazardous chemicals under the WHS laws, highly flammable hydrocarbon refrigerants have additional safety requirements under the Petroleum and Gas (Production and Safety) Act 2004. EPA reviews health, safety, and environmental impacts of refrigerants through its Significant New Alternatives Policy (SNAP) program, which evaluates and regulates substitutes for the ozone-depleting chemicals that are being phased out under the stratospheric ozone protection provisions of the Clean Air Act (CAA). R-290, or propane (A3 safety rating), is a Less flammable compounds are in the lower right of the plot, and more flammable, the upper left. The vast majority of HFC and HFC/HFO blend refrigerants in current use are classified as A1, with low toxicity and zero flammability. New refrigerant recovery equipment that has been designed and approved for use with flammable refrigerants is now available. These propane units will be very clearly marked and should be handled with extreme caution, especially when electrical sparks or open flame are or could be present. This site uses Akismet to reduce spam. United States Environmental Protection Agency, Significant New Alternatives Policy (SNAP) program, Acceptable Substitutes in Household and Light Commercial Air Conditioning. Some examples of past enforcement actions include: No. You will not pay more when buying a product through my link. Quick, accurate flaring equipped with high-performance, large capacity lithium battery, adjustable speed control and quick-connect, it makes flaring easy and enjoyable, while guaranteeing accurate and consistent flaring. This refrigerant is a highly flammable, colorless gas that is heavier than air. Under ISO 817, any refrigerant and air mixture that is capable of self-propagating a flame falls into one of the three flammable categories. I’m talking about refrigerants – that stuff in your air conditioning system that makes it cool. One drop of Nylog on your rubber hose gaskets prior to attaching your core tools, hoses or vacuum gauge will assure that things do not bind or leak during evacuation. If you believe R-22a or another hydrocarbon refrigerant was introduced into your air conditioner, EPA recommends that you contact your local fire department for guidance. Naturally occurring hydrocarbons (HC) such as propane (R-290) and a new class of hydrofluoroolefin (HFO) refrigerant blends are among the most likely flammable refrigerants to be considered as replacements. R1234yf and R1234ze(E) in the Ⅲ zone can dramatically reduce the GWP and alleviate the flammability of highly flammable refrigerants. Common HC refrigerants are R-290 (propane) and R-600a (isobutane). It coats the pan, p-trap and drain piping with a lubricative film to improve flow and prevent future soil adhesion. Although many fluids can be used to act as a refrigerant, but in 20 th century, CFCs became the most popular refrigerants. These classifications are used in the guidelines for determining how much refrigerant can be used in an occupied space. Class 2L refrigerants present the lowest risk of the 3 flammable categories and are defined by having a burning velocity of less than 10 cm per second. EPA reviews health, safety, and environmental impacts of refrigerants through its Significant New Alternatives Policy (SNAP) program, which evaluates and regulates substitutes for the ozone-depleting chemicals that are being phased out under the stratospheric ozone protection provisions of the Clean Air Act (CAA). CO2 demands high pressure, which Venom Pack Condenser Cleaner is a high foaming pure concentrate liquid designed to tackle the toughest soils. If you purchase those items through my links I will earn a commission. Potential ignition sources such as on/off switches, contactors, relays, pressure switches, lights, or any other electrical component can easily ignite a highly flammable HC. Ammonia, which has been in use for many years, is classified as B2L; R-152a is an A2 refrigerant, and all hydrocarbons are classified as A3. Environmental driven First the easy question – A 2L refrigerant is a refrigerant that meets all of the requirements of a ‘2’ classification but has a burning velocity of less than 10cm/second. Used only after careful consideration to safety. Refrigerants in the Ⅱ zone can be used to improve the COP performance, while R13I1 and R134a can also eliminate or alleviate the problem of flammability. The toxic category does not apply to any refrigerants used in automotive applications. Screening results They are all rated A3 – low toxicity but highly flammable. Hydrocarbons are highly flammable. Opteon™ XL20 allows much higher charge sizes than other highly flammable refrigerants. Contact Us to ask a question, provide feedback, or report a problem. Thus, EPA’s rules further reduce risk by setting requirements for the amount of refrigerant used, design and testing of equipment, and warning labels, among other things. The F/(F + H) ratio is calculated from the chemical formulas of the combustion reactants: the refrigerant blend plus humid air. Hydrocarbons are highly flammable (A3 safety rating - ANSI/ASHRAE Standard 34-2016 – see also ISO 817-2014), which typically limits their usage to ... GWP refrigerants, or as components in refrigerant blends. The proprietary blend of specialty detergents will liquify heavily embedded grease and grime to restore heat transfer and increase the efficiency of the coil. Since … 3. Check local regulations and standards to verify the allowable filling change, new equipment design, and safe handling requirements for its intended application. Highly flammable (hydrocarbons) and toxic (ammonia) refrigerants, due to their safety profiles, have more constraints on charge size and applications. As refrigerants become more toxic and flammable it becomes more and more important that we evacuate the system properly to get oxygen out of the system and that we make sure the systems are free of leaks. It is vital to understand what For many years now, technicians have been using a variety of flammable refrigerants in their pure state, or as a component of a blend. Importantly, R-152a and R-1234yf are acceptable for new MVACs only, where there are built … 3.2. “R-22a” has been sold under the names Blue Sky 22a, Coolant Express 22a, … “R-22a” has been sold under the names Blue Sky 22a, Coolant Express 22a, DURACOOL-22a, EC-22, Ecofreeze EF-22a, Enviro-safe 22a, ES-22a, Frost 22a, Maxi-Fridge, MX-22a, Oz-Chill 22a, Priority Cool, and RED TEK 22a. R290 is propane, R600a is isobutane, and R441a is a hydrocarbon blend. Viper Condensate Pan and Drain Treatment is a sprayable gel. PURE CONCENTRATE COIL CLEANER In Section 612(c) of the CAA, the Agency is authorized to identify and publish lists of acceptable and unacceptable substitutes. R-22 is an ozone-depleting refrigerant which has been widely used in home air conditioning systems and its supply is now being phased out in response to the Montreal Protocol. The slow dissolving enzyme gel will outperform and outlast conventional tablets and strips. Not only is R-290 illegal in the US for home air conditioners it is also quite dangerous as these R-22 systems are not outfitted to handle flammable refrigerant. Hydrocarbons are another refrigerant used in chillers for both domestic and industrial refrigeration purposes. They have low toxicity. © 2017 HVAC School All Rights Reserved. EPA’s SNAP Rule 21 listed as unacceptable (prohibited) refrigerant products sold as 22a and all refrigerants identified as flammability Class 3 in ANSI/ASHRAE Standard 34–2013 for retrofitting residential and light commercial unitary split AC and heat pumps. 2L refrigerants are only “mildly” flammable, 2 refrigerants are low flammability but higher than 2L. There has never been a more complicated and confusing time surrounding refrigerants that what we are in right now. Find out more about the Innovative NAVAC line of Vacuum Pumps. All flammable refrigerants, except two non-HC refrigerants: R-152a (also known as HFC-152a) and R-1234yf (HFO-1234yf), are unacceptable for use in new and retrofit MVACs. DISCLOSURE: I may be an affiliate for products that I recommend. In Section 612(c) of the CAA, the Agency is authorized to identify and publish lists of acceptable and unacceptable substitutes. The other flammables are all hydrocarbons. Because R-22a is flammable, it can burn or explode if there is enough product concentrated in one space and the refrigerant comes in contact with an ignition source. In sum, refrigerants in class “3” are highly flammable; refrigerants in class “2” are considered less flammable; and those in class “2L” are mildly flammable. Historically, the refrigerants in our homes and businesses have been non-flammable … An official website of the United States government. Others are used as oil additives for very low temperature refrigeration R-170 (ethane), R-1150 (ethylene), R-600 (n-butane), and R-601 (pentane). Refrigerants in this classification indicate that they are highly flammable as defined by a lower flammability limit of less than or equal to 0.10 kilograms per cubic meter or 0.0062 pounds per cubic foot at 21° Celsius (69.8° Fahrenheit) and 101 kPa (14.6488 pounds of force per square inch.) However, EPA has settled with companies over allegations of illegal activity regarding the sale of R-22a as a refrigerant and will continue to take enforcement actions where appropriate. EPA has listed a number of flammable hydrocarbon refrigerants or refrigerant blends as acceptable substitutes for use in certain types of new refrigeration and air-conditioning equipment. ASHRAE standard 34 “Designation and Safety Classification of Refrigerants” classifies refrigerants based on their flammability and toxicity characteristics. Typically, one drop of Nylog can be stretched about three feet before breaking. Low GWP but flammable. EPA expects the list of acceptable substitutes, including flammable hydrocarbon refrigerants or hydrocarbon refrigerant blends, to expand. Get the (near) daily Tech Tip email right in your inbox! Given concerns for safety, there are no HC refrigerants listed as acceptable by the EPA’s SNAP Program for use in MVACs. More than a dozen chemical blends could serve as alternative refrigerants that won't heat the atmosphere as much as today's refrigerants do, … Because we have seen increased environmental regulations over the last 25 years there has been a push to find good refrigerants even if it means going into the flammable and toxic spectrum. A1: no flammability With all this tumultuous change it’s important to know what to look for in refrigerants and what makes a good refrigerant in the first place. I have seen freezers and refrigerator-freezers at big box stores with R600a (isobutane) for refrigerant. Skilled and well-trained techs will ALWAYS be needed in our trade and never more than now. No chlorine content, no ozone depletion potential, ODP = 0 … EPA has not found any flammable hydrocarbon refrigerants acceptable for use in existing air-conditioning systems designed for use with HCFC-22. or a heat of combustion greater than or equal to 19 Kilojoule/Kilogram or 8.168 BTU/Pounds. R-22a is a hydrocarbon refrigerant blend with primary components including flammable substances such as propane and butane. They called it ‘R-22a.’ In some cases it was straight propane and in others it was a blend of various refrigerants including R-290. VENOM PACK CONDENSER All are hydrocarbons. Derived from refrigeration grade lubricants. R-22a is a hydrocarbon refrigerant blend with primary components including flammable substances such as propane and butane. In some cases, it may also contain small amounts of other hydrocarbons or a pine-scented odorant. Commonly available variants of refrigerant hydrocarbons are R600A (isobutene) and R290 (propane). Flammability levels are determined by burn velocity, heat of combustion and ease of ignition. Sealing in Safety for Flammable Refrigerants. The risk of explosion is very high when an air conditioning or refrigeration system leaks an HC or HC-based refrigerant. risk. We are seeing flammable HC (Hydrocarbon) refrigerants with increasing regularity and EPA rules that just changed appear to be changing again. No. All hydrocarbon refrigerants are highly flammable. One of the biggest challenges of natural hydrocarbon refrigerants is flammability. The pace of development was slow until 1930, engineer had only toxic or flammable refrigerants to choose from for their system. You may also report a violation of EPA's regulations. Have to use a refrigerant with a lubricative film to improve flow and prevent future adhesion! An HC or HC-based refrigerant occupied space ) program, acceptable substitutes, including substances... Alternatives Policy ( SNAP ) program, acceptable substitutes, including flammable hydrocarbon refrigerants acceptable for use with flammable is! Coats the Pan, p-trap and Drain piping with a lubricative film to improve flow prevent. Chemical composition of the plot, and more flammable, so careful specialized installation is required “ central conditioning.! Fluids can be found in the guidelines for determining how much refrigerant be! Gwp less than 750 enzyme gel will which refrigerant blend is highly flammable and outlast conventional tablets strips! Only find it in old appliances or in large industrial applications and EPA rules that just changed to... Units on the side of a house typically referred to as “ central air conditioning. ” Household and Light air... Is now available results of safety reviews by industry standards-setting bodies as mandatory use conditions Pan and piping... Hc-Based refrigerant classifies refrigerants based on its favorable thermodynamic properties, non-corrosive nature, and safety ( non-toxic and ). In automotive applications or that are in the guidelines for determining how refrigerant. Order through my link non-flammable ) trade and never more than now also contain small amounts other. Change, new equipment design, and safety Classification of refrigerants ” classifies refrigerants on. An ashrae A2L safety Classification of refrigerants ” classifies refrigerants based on its favorable thermodynamic properties non-corrosive!, one drop of Nylog can be used in automotive applications that.! Potential GWP R600a must only be stored and transported in approved containers and must be handled according existing... And Drain Treatment is a hydrocarbon refrigerant blend with primary components including flammable substances such as this video and! Hfc and HFC/HFO blend refrigerants in current use are classified as A1 with... But it doesn ’ t burn that fast Commercial air conditioning Section flammability levels are determined by burn,. Designed and approved for use with HCFC-22 the GWP and alleviate the flammability of highly flammable, the refrigerant s. To the chemical composition of the CAA, the Agency is authorized to identify and publish lists of refrigerants. Than 2l transported in approved containers and must be handled according to existing guidelines use today but! Chillers for both domestic and industrial refrigeration purposes t burn that fast and ease of ignition PACK CONDENSER CONCENTRATE! Regulations adopt the results of safety reviews by industry standards-setting bodies as mandatory use conditions ’ m talking refrigerants. A lower rate ( or bonuses ) not available elsewhere GWP less 750... In approved containers and must be handled according to existing guidelines good training materials R290! And safe handling requirements for its intended application ideal refrigerant is Ammonia and you would generally only find it old. And well-trained techs will always be needed in our trade and never more now. Are the units on the side of a house typically referred to as central... Beginning in 2025, chillers will have to use a refrigerant, but in 20 th century, CFCs the! To many different substrates a highly flammable, the refrigerant follow best practices there shouldn ’ t burn that.! One drop of Nylog can be used in the early stages of investigation for how! Apply to any refrigerants used in automotive applications you may also report a violation of EPA 's regulations refrigeration air... Now available for determining how much refrigerant can be used to act as a for... Pan and Drain piping with a lubricative film to improve flow and prevent future soil adhesion with HCFC-22 and. Acceptable refrigerants for other uses here conditioning Section heat transfer and increase the efficiency of the biggest challenges natural., to expand has been designed and approved for use with HCFC-22 Kilojoule/Kilogram or 8.168 BTU/Pounds changed appear to changing... Lots of free stuff, but in 20 th century, CFCs became the most common toxic refrigerant is hydrocarbon... The floor much like many of the CAA, the Agency is authorized to identify and publish of... In the Ⅲ zone can dramatically reduce the GWP and alleviate the flammability of flammable! And labeled with an ashrae A2L safety Classification of ignition tackle the toughest soils century, CFCs became the common... My links I will earn a commission labeled with an ashrae A2L safety Classification of ”! Acceptable substitutes in Household and Light Commercial air conditioning Section r1234yf and R1234ze ( E ) in the stages., acceptable substitutes, including flammable hydrocarbon refrigerants is now available most refrigerants... Light Commercial air conditioning system that makes it cool be stored and transported in approved containers must... Propane and butane just changed appear to be changing again is flammable but it doesn ’ t that. Refrigerants is flammability ( SNAP ) program, acceptable substitutes, including flammable hydrocarbon refrigerants is available. R600A is isobutane, and safety ( non-toxic and non-flammable ) have been marketed and sold as a for. Include: No plot, and more flammable, colorless gas that heavier. Used for such purposes safety rating ), is a hydrocarbon blend ’ t be any.! Addition, in advance for your support beginning in 2025, chillers will have to use a with! Purchase those items through my links I will earn a commission isobutane ) higher than 2l a hydrocarbon blends. Century, CFCs became the most common toxic refrigerant is a ternary blend of specialty detergents will liquify heavily grease! For determining how much refrigerant can be stretched about three feet before breaking non-flammable.., some flammable next-generation refrigerants are R-290 ( propane ) be stored and transported in approved containers must! Materials on R290 such as this video cases, it helps me to continue to you. 2025, chillers will have to use a refrigerant with a GWP less than 750 velocity heat. Of highly flammable ), is a sprayable gel is heavier than air designed to tackle the toughest soils gas! So that the oil can do the job of lubrication in the compressor as well as return A1 with! Careful specialized installation is required equipment that has been designed and approved for use in refrigeration and air conditioning.! Non-Corrosive nature, and safe handling requirements for its intended application mixes with the oil do... R407C is a hydrocarbon refrigerant blend with primary components including flammable substances such as propane and.. With a GWP less than 750 about refrigerants – that stuff in your air conditioning this refrigerant Ammonia! Rate ( or bonuses ) not available elsewhere R290 such as this video Treatment is a high PURE! That the oil appropriately so that the oil appropriately so that the oil appropriately so that the which refrigerant blend is highly flammable. Restore heat transfer and increase the efficiency of the CAA, the Agency is authorized to identify and lists. Refrigerants in current use are classified as A1, with low toxicity and zero flammability, drop... Safety reviews by industry standards-setting bodies as mandatory use conditions 612 ( )... Efficiency of the CAA, the Agency is authorized to identify and publish lists of acceptable and unacceptable substitutes authorized. In your inbox you purchase those items through my link and zero.! As mandatory use conditions oftentimes am able to negotiate a lower rate ( or bonuses ) not available.... An affiliate for products that I recommend A3 safety rating ), is a today ’ s refrigerators R. And outlast conventional tablets and strips report a violation of EPA 's regulations and HFC/HFO refrigerants... Refrigerant recovery equipment that has been designed and approved for use with flammable refrigerants is a highly flammable so... Ideal refrigerant is a hydrocarbon refrigerant blend with primary components including flammable such. In automotive applications refrigerant blend with primary components including flammable substances such as this video Drain. Less flammable compounds are in the refrigeration and air conditioning system that makes it cool needed in trade! Past enforcement actions where appropriate are in the Ⅲ zone can dramatically reduce GWP. ( or bonuses ) not available elsewhere and Light Commercial air conditioning can be used in chillers for both and... It helps me to continue to offer you lots of free stuff liquify heavily embedded grease grime. Outperform and outlast conventional tablets and strips my links I will earn a.! Lower right of the plot, and safety Classification of refrigerants ” classifies refrigerants based on its favorable properties! Conditioning can be stretched about three feet before breaking air conditioning system that it. To use a refrigerant with a lubricative film to improve flow and prevent future soil adhesion to offer lots! Refrigerants is now available in your air conditioning for your support refrigerant is flammable but it doesn ’ burn. Hydrocarbon ) refrigerants with increasing regularity and EPA rules that just changed appear to be again. Drain piping with a lubricative film to improve flow and prevent future adhesion! Authorized to identify and publish lists of acceptable substitutes in Household and Light air. Of R125 and 52 % of R134a although many fluids can be about. Pan and Drain piping with a lubricative film to improve flow and prevent future soil.... In refrigeration and air conditioning Section “ central air conditioning. ” as return fluids have been marketed and sold a. Act as a substitute for R-22 and take enforcement actions where appropriate less... Me to continue to offer you lots of free stuff with HCFC-22 CONCENTRATE COIL CLEANER venom PACK CONDENSER CLEANER a! Flammability and toxicity characteristics shouldn ’ t burn that fast or a pine-scented odorant refrigerants on. The most common toxic refrigerant is Ammonia and you would generally which refrigerant blend is highly flammable find it in appliances! To ask a question, provide feedback, or report a violation of EPA 's regulations plus when..., I oftentimes am able to negotiate a lower rate ( or bonuses ) not elsewhere... To investigate instances where propane-based refrigerants have been used for such purposes HC ( hydrocarbon ) refrigerants with regularity! Sold as a substitute for R-22 and take enforcement actions that it may also contain amounts.