ORAFON PREMIUM PAG 68 C

Polyalkylene Glycol

 

ORAFON PREMIUM PAG 68 C are new Polyalkylene Glycol that guarantee high-performances in A/C Systems with CO2. COis a Refrigerant with a complex and delicate balance, which requires outstanding performances to the Lubricant. PAG for COoffer a better miscibility with COin a wide range of concentrations and temperatures. This means: excellent lubricating properties and higher efficiency for the Refrigeration System.

ORAFON PREMIUM PAG 68 C for COhave a reduced Hygroscopicity (if compared to normal PAG, which is unprotected to hydroxyl and used with other refrigerants). These Oils also have High Chemical Stability, Thermal and Hydrolysis Resistance.

COoffers unfavorable characteristics in normal Refrigeration Applications, with a very high discharging pressure and a very low critical temperature (31°C – 74 bar). This situation requires sub and supercritical operating conditions in single-stage Systems with delivery pressure exceeding 100 bar. In addition, the energy performance is lower than the conventional vapor compression process.

However, in applications with potentially high rates of dispersion and where flammable refrigerants cannot be used for safety reasons, there are opportunities to use CO2. For example, COis a valid option for Air Conditioning Systems in Automotive. For commercial and industrial refrigeration units, COcan be used as a secondary fluid in a Cascade System.

Most of the conventional lubricants such as Mineral and Alkylbenzene oils are not soluble with CO2. The Polyol Ester (POE) show good miscibility properties, however this may cause a drastic Viscosity reduction.

PAG for COshow miscibility with COin a wide range of temperatures and lubricant concentrations.But the viscosity properties of Polyalkylene glycols remain unchanged and the decrease of viscosity (observed with POE) does not happen in PAG lubricants under dilution with CO2.

 

Key Benefit :

  Miscibility with COin a wide range of lubricant concentration and temperature ;

  Reduced hygroscopic than a PAG without protection in the process of absorbing water ;

  High chemical stability to heat and hydrolysis ;

  Excellent lubricating capacity ;

  Protection Terminals Technology and Protective Element Choice (Capped or Multi-capped)* ;

 

Method and Reference Unit VALUE Reference Method
ISO VG 68
Kinematic Viscosity @ 40°C (cSt) 70 ASTM D 445
Kinematic Viscosity @ 100°C (cSt) 14 ASTM D 445
Viscosity Index 210 ASTM D 2270
Pour Point (°C) -46 ASTM D 97
Flash Point (°C) >200 ASTM D 92
Density @ 15°C (g/cm³) 0.998 ASTM D 4052
Humidity Content (ppm) 300 ASTM E 1064
Total Acidity (mg KOH/g) 0.02 ASTM D 974
Colour (APHA) 20 ASTM D 1209
Capping efficiency (%) 95 IM
4-Ball wear scar -40kg/1hr (mm) 0.5 ASTM D 4172
Cu corrosion test 1a ASTM D 130
Stream turbine corrosion test Pass ASTM D 665(a)

* Several performance advantages are associated with the use of PAG for COas Synthetic Lubricants for Refrigeration with CO2. A typical Polyalkylene Glycol generally consists of Polymer chains terminated with a Hydroxyl group that is chemically active at one end. On the contrary, a protected PAG is a chemically inactive group at both ends of the molecule. PAG for CO2, based on the “capped PAG” technology, provide effective lubrication for Refrigeration Units and compression. Protection technology (“capped” technology) also provides improved lubricity for COSystems. High efficiency of the process typically results in about 95% for PAG for the COrange.

 

Remark ;

It is suggested a dosage as close as possible to the quantity needed. For the biggest formats, it is recommended to quickly close the container and keep it in a cool and dry place in order to avoid the formation of moisture. Keep the product between 25°C and 40°C. Do not expose to sunlight.

 

Focus more on :

ORAFON PREMIUM PAG 68 C Lubricity Properties.

The development of the trans-critical COSystems requires special Lubricants because of High Pressure and subsequently higher load on the bearings. The extreme PAG pressure and anti-wear properties are superior to those of POE and other synthetic materials, such as PVEs.

These lubricating properties are kept under High-Pressure conditions. PAG 68 for CO(“capped” technology based), provides efficient lubrication for refrigeration units. These improved lubricating properties for COSystems are obtained as a result of the terminals protection technology (capped technology).

In order to simulate as accurately as possible the COpressurized environment, Falex Block-on-Ring test was used to evaluate the effect on the PAG 68 for COproperties using the following parameters:

 

Load Steps +50 lbs, followed by +20 lbs
Rotation Speed 600 rpm
Atmosphere CO2
Overpressure 10 bar (150 psi)
Step Duration 5 minutes
Temperature Min 90C
Ring Falex S10, SAE 4620 steel, Rc5 8-63 6-12 rms
Blocks Falex H-30, SAE 01 steel, Rc 27-33, 4-8 rms

 

The load pressure (lbs) and estimated wear (mm) were recorded for PAG 68 for the CO(and with the addition of additives EP / AW – PAG 68 for CO2):

 

ORAFON PREMIUM PAG 68 C Stability to hydrolysis.

Unprotected Polyalkylene glycols. Hydroxyl are very Hygroscopic and can absorb thousand ppm of water if exposed to humid conditions. Despite this PAG lubricants do not hydrolyze under normal operating conditions. Therefore problems related to water consumption in alternative synthetic lubricants (such as esters of polyols) cannot be caused – problems such as corrosion or ice formation in the expansion/capillary valve.

Due to the replacement of the hydroxyl terminal group with an alkyl species in the PAG 68 for CO2, the hygroscopicity is lower than in a free PAG.

While the water absorbed by the PAG is not free (but linked to PAG) and does not cause problems that may be associated with the free moisture, the reduced hygroscopicity exhibited by PAG 68 for COcan be obtained through a careful choice of the end-capped hydroxyl. A maximum water content (0.05%) has been defined for PAG 68 for CO2.

 

 

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