Transcription

Freon 134aRefrigerant (R-134a)Properties, Uses,Storage, andHandling

Freon 134aRefrigerantTable of ContentsMonitors and Leak Detection. 21Introduction.4Types of Detectors.21Background. 4Nonselective Detectors.21Freon 134a—An Environmentally AcceptableAlternative. 4Halogen-Selective Detectors.22Compound-Specific Detectors.22Uses.4Fluorescent Dyes.22Physical Properties.5Shipping, Storage, and Handling . 22Chemical/Thermal Stability.5Shipping Containers in the United States.22Thermal Decomposition. 5Bulk Storage Systems.23Stability with Metals and Refrigeration Lubricants. 5Converting Bulk Storage Tanks from CFC-12to Freon 134a.23Stability with Foam Chemicals. 8Compatibility Concerns If Freon 134a andCFC-12 Are Mixed. 8Material Compatibility Concerns.24Materials Compatibility.8Handling Precautions for Freon 134aShipping Containers.25Plastics. 9Recovery, Reclamation, Recycle, and Disposal. 25Elastomers. 9Recovery.25Hose Refrigeration Lubricants.12Disposal.26Safety. 19Inhalation Toxicity.19Cardiac Sensitization.19Skin and Eye Contact.20Spills or Leaks.20Combustibility of Freon 134a.20Combustibility within Chlorine.213

Freon 134aRefrigerantIntroduction Freon 134a (Auto)Background Formacel Z-4 (foam blowing agent market)Freon 134a was introduced by Chemours as a HFC-134a (aerosol market)replacement for chlorofluorocarbons (CFCs) in manyThe chemical properties of Freon 134a are listed below.applications. CFCs, which were developed over 60 yearsago, have many unique properties. They are low in toxicity,Freon 134a Chemical Informationnonflammable, noncorrosive and compatible with otherChemical Namematerials. In addition, they offer the thermodynamic and1,1,1,2-tetrafluoroethaneMolecular Formulaphysical properties that make them ideal for a variety ofCH2FCF3CAS Registry Numberuses. CFCs are used as refrigerants; as blowing agents in811-97-2Molecular Weightthe manufacture of insulation, packaging and cushioning102.0Chemical Structurefoams; as cleaning agents for metal and electronicFcomponents; and in many other applications.However, the stability of these compounds, coupled withFFCCFHHtheir chlorine content, has linked them to depletion of theUsesearth’s protective ozone layer. As a result, Chemours hasFreon 134a can be used in many applications thatphased out production of CFCs and introducedcurrently use dichlorodifluoromethane (CFC-12). Theseenvironmentally acceptable alternatives, such asinclude refrigeration, polymer foam blowing, and aerosolhydrofluorocarbon (HFC) 134a.products. However, equipment design changes aresometimes required to optimize the performance of Freon Freon 134a—An Environmentally Acceptable134a in these applications.AlternativeThe thermodynamic and physical properties of Freon Freon 134a does not contain chlorine; therefore, it has an134a, coupled with its low toxicity, make it a very efficientozone depletion potential (ODP) of zero. Listed below areand safe replacement refrigerant for CFC-12 in manyall generic and Chemours trade names:segments of the refrigeration industry, most notably in Hydrofluorocarbon-134aautomotive air conditioning, appliances, small stationary Freon 134aequipment, medium-temperature supermarket cases, and HFA-134aindustrial and commercial chillers. Table 1 provides a Freon 134acomparison of the theoretical performance of CFC-12 andFreon 134a at medium-temperature conditions.Figure 1. Infrared Spectrum of Freon 134a Vapor at 400 mmHg Pressure (53.3 kPa) in a 10-cm CellMICRONS3.04.05.06.07.08.09.01012141618 2025 30 35 0001,8001,6001,4001,2001,000-1WAVENUMBER (CM )MICRONS4800600400200TRANSMITTANCE (%)TRANSMITTANCE (%)2.5

Freon 134aRefrigerantTable 1. Theoretical Cycle Comparison of CFC-12 andStability with Metals and Refrigeration LubricantsFreon 134a*Stability tests for refrigerants with metals are typicallyCFC-12Freon 134aCapacity (as % CFC-12)10099.7of sealed tube stability tests are available for CFC-12/Coefficient of Performance (COP)3.553.43mineral oil combinations, which have shown long-term86.8 (188.2)1349 (195.6)83.1 (181.5)1473 (213.7)4.14.7CompressorExit Temperature, C ( F)Exit Pressure, kPa (psia)Compression Ratioperformed in the presence of refrigeration oils. The resultsstability in contact with copper, steel, and aluminum inactual refrigeration systems. Polyalkylene glycol (PAG) andpolyol ester (POE) lubricants are used with Freon 134a.Sealed tube tests were run to determine the relative*Temperatures were as follows: Condenser, 54.4 C (130.0 F); Evaporator, 1.7 C (35.0 F);Compressor Suction, 26.7 C (80.0 F); Expansion Device, 51.7 C (125.0 F).long-term stability of Freon 134a/metals in the presenceof these lubricants.Freon 134a can be used to replace CFC-11, CFC-12, andThe method followed was generally the same as ASHRAE 97HCFC-142b in many thermoplastic foam applications. Freon with several minor modifications. A 3-mL volume of134a can be used as a replacement for CFC-12 and HCFC-refrigerant/lubricant solution was heated in the presence of141b in thermoset foams. HFC‑134a features properties thatcopper, steel, and aluminum strips in an oven for 14 days atare advantageous for high value-in-use products and meets175 C (347 F). Both the neat lubricant and a mixture ofthe requirements of safety/environmental issues. Freon lubricant and refrigerant (50/50 volume ratio) were tested.134a is nonflammable, has negligible photochemicalVisual ratings were obtained on both the liquid solutionsreactivity, and low vapor thermal conductivity.and the metal coupons after the designated exposure time.The visual ratings ranged from 0 to 5, with 0 being the best.Freon 134a is also being developed for use inpharmaceutical inhalers because of its low toxicity andAfter the visual ratings were obtained, sample tubes werenonflammability. Other aerosol applications may useopened and the lubricant and refrigerant (if present) wereFreon 134a where these properties are critical. Seeanalyzed. The lubricant was typically checked for halideChemours technical bulletin for additional information oncontent and viscosity, while the refrigerant was examinedaerosol applications of HFC‑134a.for the presence of decomposition products. Table 3summarizes typical data for both Freon 134a and CFC-Physical Properties12. Visual ratings are listed for the neat lubricant, thePhysical properties of Freon 134a are given in Table 2 andlubricant/refrigerant solution, and the three metals thatFigures 2 through 8. Additional physical property data maywere present in the lubricant/refrigerant solutions.be found in other Chemours publications. Technical bulletinViscosity was determined on the unused lubricant, the"Transport Properties of Freon Refrigerants" containstested neat lubricant, and the lubricant tested in theviscosity, thermal conductivity, and heat capacity data forpresence of refrigerant. A percent change was calculatedsaturated liquid and vapor, in addition to heat capacity datafor the two tested lubricants. The decomposition productsand heat capacity ratios for both saturated and super-listed are HFC-143a (the predominant decompositionheated vapors. Thermodynamic tables in English and SIproduct for Freon 134a) and fluoride ion. Both species areunits are available in technical bulletins, "Thermodynamictypically measured in the low parts per million (ppm) range.Properties of HFC-134a". Liquid and vapor densities areincluded in the thermodynamic tables.As the CFC-12/mineral oil combinations have been provenin actual service, these tests indicate that Freon 134a/Chemical/Thermal StabilityPAG and Freon 134a/POE solutions have acceptableThermal Decompositionchemical stability. In several other tests, results haveFreon 134a vapors will decompose when exposed to highconfirmed that the Freon 134a molecule is as chemicallytemperatures from flames or electric resistance heaters.stable as CFC-12.Decomposition may produce toxic and irritating compounds,such as hydrogen fluoride. The pungent odors released willirritate the nose and throat and generally force people toevacuate the area. Therefore, it is important to preventdecomposition by avoiding exposure to high temperatures.5

Freon 134aRefrigerantTable 2. Physical Properties of Freon 134aPhysical PropertyUnitFreon 134aChemical Name—Ethane, 1,1,1,2-TetrafluoroChemical Formula—CH2FCF3Molecular Weightg/mol102.03Boiling Point at 1 atm (101.3 kPa or 1.013 bar) C F–26.1–14.9Freezing Point C F–103.3213.9Critical Temperature C F101.1213.9Critical PressurekPapsia4060588.9Critical Volumem3/kgft3/lb1.94 x 10–30.031Critical Densitykg/m3lb/ft3515.332.17Density (Liquid) at 25 C (77 F)kg/m3lb/ft31,20675.28Density (Saturated Vapor) at Boiling Pointkg/m3lb/ft35.250.328Heat Capacity (Liquid) at 25 C (77 F)kJ/kg·KBtu/lb·( F)1.440.339Heat Capacity (Vapor at Constant Pressure) at 25 C (77 F) (1 atm)(101.3 kPa or 1.013 bar)kJ/kg·KBtu/lb·( 7.293.4W/m·KBtu/hr·ft·( F)W/m·KBtu/hr·ft·( F)0.08240.04780.01450.00836MPa·S (cP)MPa·S (cP)0.2020.012wt%0.15Vapor Pressure at 25 C (77 F)Heat of Vaporization at Normal Boiling PointThermal Conductivity at 25 C (77 F)LiquidVapor at 1 atm (101.3 kPa or 1.013 bar)Viscosity at 25 C (77 F)LiquidVapor at 1 atm (101.3 kPa or 1.013 bar)Solubility of Freon 134a in Water at 25 C (77 F) and 1 atm(101.3 kPa or 1.013 bar)Solubility of Water in Freon 134a at 25 C (77 F)wt%0.11Flammability Limits in Air at 1 atm (101.3 kPa or 1.013 bar)vol %NoneAuto-Ignition Temperature C F7701,418Ozone Depletion Potential (ODP)—0Halocarbon Global Warming Potential (HGWP) (For CFC-11, HGWP 1)—0.28Global Warming Potential (GWP) (100 yr ITH) (GWP For CO2, GWP 1)—1,200TSCA Inventory Status—Reported/Includedppm (v/v)1,000Toxicity AEL* (8- and 12-hr TWA)*Acceptable exposure limit (AEL) is an airborne inhalation exposure limit established by Chemours that specifies time-weighted average (TWA) concentrations to which nearly all workersmay be repeatedly exposed without adverse effects.Note: kPa is absolute pressure.6

Freon 134aRefrigerantTable 3. Stability of Freon 134a with Metals and Lubricating OilsOilMineral OilMineral OilUCON RO-W-6602*Mobil EAL Arctic 32**Oil Viscosity, cSt at 40 C (104 F)30.712513429.4Castrol Icematic SW 100**108.8RefrigerantR-12R-12Freon 134aFreon 134aFreon 134aNeat Iron33000Aluminum22000% Change NeatNDND 1–3.14.3% Change with RefrigerantNDND–12.7–36.2–27.1Viscosity ChangeDecomposition AnalysisHFC-143a, ppmNDND 7 3 0.3Fluoride, ppmND420 0.7— 7*Polyalkylene glycol lubricant.Stability Ratings: 0 to 5**Polyol ester lubricant.0 BestND Not determined.3 FailedFigure 3. Pressure vs. Temperature (SI Units)10,0005 CokedFigure 2. Solubility of Water in Freon 134a1,000Temperature, C–40 –20020406080100Pressure, re, C100150Figure 4. Pressure vs. Temperature (English Units)1,0001,0005000100–50050100Temperature, F150Pressure, psiaWeight ppm Water in Freon rature, F150200250

Freon 134aRefrigerantFigure 5. Vapor Thermal Conductivity of Freon 134a atTable 4. Stability of Freon 134a with Foam ChemicalsAtmospheric Pressure (SI Units)Catalyst0.030Vapor Thermal Conductivity,Wattsm· C0.0280.0260.024Amine 0.001Potassium 0.001Tin 0.001Neutralized Amine 0.001Test ConditionsSix weeks at 60 C (140 F)25% (wt) Freon 134aTwo parts catalyst per 100 parts polyol by weightOne part water per 100 parts polyol by weightType 1010 steel test coupon0.0220.0200.0180.016Compatibility Concerns If Freon 134a and CFC-120.014Are Mixed0.0120.010Degradation, %Freon 134a and CFC-12 are chemically compatible with020406080100120each other; this means that they do NOT react with each140other to form other compounds. However, when the twoTemperature, Cmaterials are mixed together, they form what is known asan azeotrope. An azeotrope is a mixture of two componentsFigure 6. Vapor Thermal Conductivity of Freon 134a atthat acts like a single compound, but has physical andAtmospheric Pressure (English Units)chemical properties different from either of the twocomponents. An example of this is Freon 502, which is an0.016azeotrope of HCFC-22 and CFC-115. When Freon 134a0.015and CFC-12 are mixed in certain concentrations, they formVapor Thermal Conductivity,Btuhr·ft· F0.014a high-pressure (low boiling) azeotrope. This means that the0.013vapor pressure of the azeotrope is higher than that of either0.012of the two components by themselves. At 752 kPaabsolute (109 psia) the azeotrope contains 46 wt%0.011Freon 134a. In general, compressor discharge pressures0.010will be undesirably high if refrigeration equipment isoperated with a mixture of Freon 134a and CFC-12.0.0090.008Another characteristic of an azeotrope is that it is very0.0070.006difficult to separate the components once they are mixed04080120160200240together. Therefore, a mixture of Freon 134a and CFC-12280cannot be separated in an on-site recycle machine or inTemperature, Fthe typical facilities of an off-site reclaimer. Mixtures ofFreon 134a and CFC-12 will usually have to be disposedStability with Foam Chemicalsof by incineration.As with other alternative blowing agents, the stability ofFreon 134a in foam chemicals (B-side systems) is beingMaterials Compatibilitystudied. The first tests evaluated Freon 134a stability inBecause Freon 134a is used in many applications, it isa sucrose-amine polyether polyol with either an amineimportant to review materials of construction for compatibilitycatalyst, a potassium catalyst, a tin catalyst, or an aminewhen designing new equipment, retrofitting existingcatalyst neutralized with an organic acid. The initial tests,equipment, or preparing storage and handling facilities.which included analysis of the volatile components,showed no degradation of Freon 134a in any of thesystems, even at elevated temperatures. The results aresummarized in Table 4.8

Freon 134aRefrigerantPlasticsElastomersCustomary industry screening tests, in which 23 typicalCompatibility results for Freon 134a and CFC-12 areplastic materials were exposed to liquid Freon 134a incompared for 11 typical elastomers in Tables 6 throughsealed glass tubes at room temperature, are summarized in17. It should be recognized, however, that effects onTable 5. Observations of weight gain and physical changespecific elastomers depend on the nature of the polymer,were used to separate materials meriting further laboratorythe compounding formulation used, and the curing orand/or field testing from materials that appearedvulcanizing conditions. Actual samples should be testedunacceptable. Users of this bulletin should confirmunder end-use conditions before specifying elastomers forcompatibility in their own system designs.critical components.Table 5. Plastics Compatibility of Freon 134aRecommendations, based on the detailed data in Tables 7Chemical Typethrough 17, are given in Table 6. Data on temporaryTrade Nameelastomer swell and hardness changes were used as thePlastic materials meriting further testing:ABSKralastic (Uniroyal Chem.)prime determinants of compatibility. The subsequent finalAcetalDelrindata were used as a guide to indicate if the seals in aEpoxyTeflon FluorocarbonsPTFEETFEPVDFTeflon Tefzel IonomerSurlynare exposed to a mixture of refrigerant and refrigeration oil.Polyamide6/6 NylonZytel Chemours has measured the compatibility of Mylar PolyarylateArylon polyester film with Freon 134a/polyol ester lubricantPolycarbonateTuffak (Rohm & Haas Co.)systems compared to CFC-12/mineral oil systems. SlotPolyesterPBTPETValox (General Electric)Rynite widely used in hermetic compressor motors for CFC-12PolyetherimideUltem (General Electric)Polyethylene-HDAlathonPolyphenylene OxideNoryl (General Electric)Polyphenylene SulfideRyton (Phillips Chem. Co.) refrigeration system should be replaced after equipmentteardown.Most polymeric materials used in refrigeration equipment liners, wedges, and interphase insulation of Mylar areservice. Studies indicate that the life of Mylar in systemsusing Freon 134a will be comparable to film life inCFC-12 systems. In cases where polyester film fails inhermetic systems, the cause is usually traced to unwantedmoisture. Too much moisture causes polyester film toPolypropylenePolystyreneStyron (Dow Chem. Co.)PolysulfonePolysulfonehydrolyze and embrittle. Results indicate that the POElubricants used with Freon 134a tend to pull water fromMylar . This promotes a drier film, which should result in aPolyvinyl ChloridePVCCPVClonger motor insulation life. Because polyester motorinsulation is buried beneath windings and can be difficult todry, this water extraction capability of POE lubricantsPlastic materials exhibiting unacceptable change:AcrylicLuciteshould be a valuable performance asset. FurtherCellulosicEthocel (Dow Chem. Co.)information is available from Chemours. Test Conditions: Plastic specimens exposed to liquid Freon 134a (no lubricant) in sealedglass tubes for two weeks at room temperature.Additional materials compatibility data are being developedby equipment manufacturers.Because the performance of plastic materials is affectedby polymer variations, compounding agents, fillers, andmolding processes, verifying compatibility using actualfabricated parts under end-use conditions is advised.9

Freon 134aRefrigerantFigure 7. Pressure-Enthalpy Diagram for Freon 134a (SI Units)10

Freon 134aRefrigerantFigure 8. Pressure-Enthalpy Diagram for Freon 134a (English Units)11

Freon 134aRefrigerantHose PermeationRefrigeration LubricantsElastomeric hoses are used in mobile air conditioningMost compressors require a lubricant to protect internalsystems and for transferring Freon 134a in othermoving parts. The compressor manufacturer usuallyapplications. The permeation rates of Freon 134a andrecommends the type of lubricant and viscosity that shouldCFC-12 through several automotive A/C hoses werebe used to ensure proper operation and equipmentmeasured as a guide to hose selection.durability. Recommendations are based on several criteria,such as lubricity, compatibility with materials ofThe studies were run at 80 C (176 F) with an initial 80 volconstruction, thermal stability, and refrigerant/oil miscibility.% liquid loading of Freon 134a in 76-cm (30-in) lengths ofTo ensure efficient operation and long equipment life, it is15.9-mm (5/8-in) inside diameter automotive air conditioningimportant to follow the manufacturer’s recommendations.hose. Hose construction and permeation rates aresummarized in Table 18. Based on these tests, hoses linedCurrent lubricants used with CFC-12 are fully miscible overwith nylon, as well as those made of Hypalon 48, appearthe range of expected operating conditions, easing theto be suitable for use with Freon 134a. Note, however,problem of getting the lubricant to flow back to thethat these rate measurements provide a comparison of thecompressor. Refrigeration systems using CFC-12 takevarious hoses at a single temperature and should not beadvantage of this full miscibility when considering lubricantused as an indication of actual permeation losses from anreturn. Refrigerants such as Freon 134a, with little or nooperating system.chlorine, may exhibit less solubility with many existingmineral oil or alkylbenzene lubricants.DesiccantsThe search for lubricants for use with Freon 134a startedDriers filled with desiccant are typically used in refrigerationwith commercially available products. Table 19 showssystems and bulk storage facilities. A common molecularsolubilities of various refrigerant/lubricant combinations.sieve desiccant used with CFC-12, 4A-XH-5, is notCurrent naphthenic, paraffinic, and alkylbenzene lubricantscompatible with Freon 134a. However, manufacturershave very poor solubility with Freon 134a. PAGs with lowhave developed other molecular sieve desiccants thatviscosity show good solubility; but, as viscosity increases,perform well with Freon 134a. XH-7 and XH-9 or MS 592they become less soluble. Polyol ester lubricants, of whichand MS 594 desiccants may be used in loose filled driers.there are many types, generally show good solubility withCompacted bead dryers, in which the desiccant isFreon 134a. When compared with PAGs, ester lubricantscompacted by mechanical pressure, may use XH-6 inaddition to the desiccants listed above.are more compatible with hermetic motor components andIn molded core driers, the molecular sieve is dispersedrefrigeration system.are less sensitive to mineral oil and CFC-12 remaining in awithin a solid core. Several manufacturers offer moldedAlthough Freon 134a and CFC-12 are chemicallycore driers that are compatible with Freon 134a. Consultcompatible with each other, such is not the case withthe drier manufacturer for recommendations.CFC-12 and PAG lubricants. Specifically, the chlorinecontained in CFC-12 or other chlorinated compounds canreact with the PAG and cause lubricant degradation.Lubricant degradation can result in poor lubrication andpremature failure. In addition, sludge will be formed, whichcan plug orifice tubes and other small openings.12

Freon 134aRefrigerantTable 6. Elastomer Compatibility of Freon 134aRatingsCFC-1225 C (77 F)80 C (176 F)Adiprene L15Buna N1*0*Buna S34Butyl Rubber24Hypalon 4810Natural Rubber45Neoprene W0*Nordel Elastomer2*SiliconeFreon 134a141 C (285 F)25 C (77 F)80 C (176 F)141 C (285 F)25110*13200301*000201*0202*11055222Thiokol FA111*00Viton A555522*0*Recommend elastomer replacement after equipment teardown.Codes: 0 No change1 Acceptable change2 Borderline change3 Slightly unacceptable change4 Moderately unacceptable change5 Severely unacceptable changeTable 7. Compatibility of Refrigerants with Adiprene L25 C (77 F)80 C (176 F)CFC-12Freon 134aCFC-12Freon Temporary, D SH–2–4—a–28Final, D y0001dFinal0052dLength Change, %aWeight Change, %aShore A HardnessElasticity RatingVisual RatingLiquidPolymeraTest Conditions: 27 days immersion of the polymer at 25 C (77 F) and 80 C (176 F) in liquid (temporary) plus two weeks drying in air at about 25 C (77 F) (final).aSample disintegratedMore elasticbBroke when stretchedc13Stickyd

Freon 134aRefrigerantTable 8. Compatibility of Refrigerants with Buna NCFC-12Freon 134a25 C (77 F)80 C (176 F)141 C (285 F)25 C (77 F)80 C (176 F)141 C (285 l0–12000Original777672777475Temporary, D SH–6–19–5–1–3Final, D y011b000Final011000Length Change, % ( 0.5)Weight Change, % ( 0.5)Shore A HardnessElasticity RatingVisual RatingLiquidPolymerbTest Conditions: 27 days immersion of the polymer at 25 C (77 F), 80 C (176 F), and 141 C (285 F) in liquid (temporary) plus two weeks drying in air at about 25 C (77 F) (final).aMore elasticSurface dulledbTable 9. Compatibility of Refrigerants with Buna S25 C (77 F)CFC-1280 C (176 F)Freon 134aCFC-12Freon 134aLength Change, %Temporary–0.11.10.70.8Final–2.5 –6.2–0.1Original85848381Temporary, D nal3b1b3b00000Temporary0000Final0000Weight Change, %Shore A HardnessFinal, D SHElasticity RatingVisual RatingLiquidPolymerTest Conditions: 27 days immersion of the polymer at 25 C (77 F) and 80 C (176 F) in liquid (temporary) plus two weeks drying in air at about 25 C (77 F) (final).aMore elasticLess elasticb14

Freon 134aRefrigerantTable 10. Compatibility of Refrigerants with Butyl Rubber25 C (77 F)80 C (176 F)CFC-12Freon 134aCFC-12Freon ry, D SH–8–1–14–4Final, D Temporary003c4cFinal0012dLength Change, %Weight Change, %TemporaryFinalShore A HardnessElasticity RatingVisual RatingLiquidPolymerdTest Conditions: 27 days immersion of the polymer at 25 C (77 F) and 80 C (176 F) in liquid (temporary) plus two weeks drying in air at about 25 C (77 F) (final).aMore elasticWhite solids in liquidbWhite deposit on elastomerWhite film on elastomercdTable 11. Compatibility of Refrigerants with Hypalon 48CFC-12Freon 134a25 C (77 F)80 C (176 F)141 C (285 F)25 C (77 F)80 C (176 F)141 C (285 F)10100100000Length Change, % ( 0.5)TemporaryFinalWeight Change, % ( Temporary, D SH–400311Final, D 11*000Final011*000Shore A HardnessElasticity RatingVisual RatingLiquidPolymerTest Conditions: 27 days immersion of the polymer at 25 C (77 F), 80 C (176 F), and 141 C (285 F) in liquid (temporary) plus two weeks drying in air at about 25 C (77 F) (final).*Surface dulled15

Freon 134aRefrigerantTable 12. Compatibility of Refrigerants with Natural Rubber25 C (77 F)80 C (176 F)CFC-12Freon 134aCFC-12Freon 6–0.5–2.6–0.6Original55565657Temporary, D SH–9–1–17–8Final, D porary0000Final0000Length Change, %TemporaryFinalWeight Change, %TemporaryFinalShore A HardnessElasticity RatingVisual RatingLiquidPolymerTest Conditions: 27 days immersion of the polymer at 25 C (77 F) and 80 C (176 F) in liquid (temporary) plus two weeks drying in air at about 25 C (77 F) (final).*More elasticTable 13. Compatibility of Refrigerants with Neoprene W25 C (77 F)CFC-1280 C (176 F)Freon 134aCFC-12Freon 134aLength Change, 3Weight Change, riginal73737372Temporary, D SH–10–5–7Final, D rary001e0Final0000Shore A HardnessElasticity RatingVisual RatingLiquidPolymerTest Conditions: 27 days immersion of the polymer at 25 C (77 F) and 80 C (176 F) in liquid (temporary) plus two weeks drying in air at about 25 C (77 F) (final).aLess elasticMore elasticbClear, yellowc16HazydeWhite film

Freon 134aRefrigerantTable 14. Compatibility of Refrigerants with Nordel Elastomer25 C (77 F)80 C (176 F)CFC-12Freon 134aCFC-12Freon 8.40.4Temporary5.52.86.14.4Final–22 0.1–22–0.2Original66666563Temporary, D SH–4–30–6Final, D ry0000Final0010Length Change, %Weight Change, %Shore A HardnessElasticity RatingVisual RatingLiquidPolymercTest Conditions: 27 days immersion of the polymer at 25 C (77 F) and 80 C (176 F) in liquid (temporary) plus two weeks drying in air at about 25 C (77 F) (final).aLess elasticMore elasticbWhite filmcHazydTable 15. Compatibility of Refrigerants with Silicone25 C (77 F

Oil Mineral Oil Mineral Oil UCON RO-W-6602* Mobil EAL Arctic 32** Castrol Icematic SW 100** Oil Viscosity, cSt at 40 C (104 F) 30.7 125 134 29.4 108.8 Refrigerant R-12 R-12 Freon 134a Freon 134a Freon 134a Ratings Neat