Lube-Tech PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE Figure 10. Micro-Coking Test, 230-280°C, GFC-Lu-27-A-13


This was confirmed on the GF-5 oils by running a TEOST 33C test that shows a 30% reduction on the total mass of deposit (Figure 11).


3.3 Taking high temperature chain oils a step further Specifically designed neopolyol esters (with a high amount of branched acids) do show an ideal profile in use in high temperature chain oils: • they exhibit low volatility and resist high temperatures for a long time;


• when they start degrading, they actually decompose quickly into light, volatile fractions;


• they leave very little or no residue. Figure 11. TEOST 33C (ASTM D6335)


With regards to volatility, isothermal thermogravimetric analyses display obvious reduction of the overall volatility of the modified oils (Figure 13), which is confirmed by NOACK test measurements that exhibit up to 1.6% mass loss reduction (Figure 12).


Such a behavior is significantly different from synthetic hydrocarbons, or even diesters or triesters like trimellitate, that tend to evaporate/get oxidized very quickly and leave a high amount of residue (Figure 14 and 15).


No.102 page 5


Figure 12. NOACK test ASTM D6375 Figure 14. TGA, 250°C, O2


Figure 15. Micro-Coking Test on high temperature chain oils Figure 13. TGA, 200C, O2 34 LUBE MAGAZINE NO.131 FEBRUARY 2016


Optimized ester chemistry, suitably additized with high performance anti-oxidants specifically developed to optimize resistance to oxidation and clean degradation, achieves outstanding high temperature performance. Temperatures of up to 300°C may be sustained on high temperature oils using such technology.


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