Calibration of Canon -fenske viscometers in -51 oC

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Iran
Hey guys, I want to calibrate a canon fenske viscometer in -51 oC, but I cant find any certified viscosity standards for -51 oC. Can anyone tell me how can I calibrate this viscometer and is there any certified viscosity standard for -51oC? Thanks
 
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JHZR2

Staff member
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Location
New Jersey
I was under the impression that silicone oils were used for calibration. The stress-stran characteristics may vary, but I would guess that the hardest part is actually getting the viscometer down to -51.
 
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