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Additionally, further tests were carried out on the SRV test machine (in accordance to DIN 51834-4) which measured and compared the wear resistance and the coefficient of friction (CoF). Figure 3 lists the CoF after 15, 30, 90, and 120 minute operating times. These results demonstrate that the new Molykote®


G-9000 lubricant’s (phenyl/fluoro fluid) CoFs are slightly higher than those of the fluoro-based lubricants and, compared to phenyl-based lubricants, they also show much better results.


Figure 1 & 2. Thermal Stability of Copolymer Fluids.


Additionally, Table 1 compares the viscosity indexes of phenyl/fluoro copolymers with various lubricating fluids. It can be seen that the phenyl/fluoro copolymers have viscosity indexes of about 230-240, which is higher than most other hydrocarbon or PFPE fluids.


Figure 3. SRV Measurement Results. Additive Acceptance


Further investigation of the new lubricant indicates that their additive acceptance is much better than either phenyl-based or fluoro-based fluids. Table 3 below shows wear resistance improvements (DIN 51350-3) by using commercially available additives. The values listed are the changes compared to the copolymer fluid (phenyl/fluoro ratio of 50:50) without additives.


Table 1. Properties of Phenyl/Fluoro Copolymer Fluids.


Wear Resistance With regards to wear resistance, data was collected in accordance with 4-Ball Test DIN 51350-3 as seen in Table 2. The data demonstrates the wear scar average after three steel balls are exposed to a load of 400N and 800N for 1 hour. Wear scars for all three phenyl/fluoro fluids were obtainable, whereas this was not possible for the phenyl-based fluid due to the heavy load. The results confirm that the lubricant with a higher fluoro content have smaller wear scars.


Table 3. Wear Resistance Improvements by Additives.


Lower Specific Gravity & Cost-in-Use The Molykote®


G-9000 Series phenyl/fluoro copolymer greases


have a lower specific gravity, or are much lighter, than PFPE lubricants. This means that customers can use 30% less grease for the same volume to lubricate. It also enhances performance in applications where high bearing speed or total mass are critical.


Table 2. Wear Resistance of Copolymer Fluids. Continued on page 22


LUBE MAGAZINE NO.137 FEBRUARY 2017


21


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