Jaguar HP 105 (HP Guar) Viscostiy/ Thermal Stability
I have been experimenting with Jaguar HP 105 (Hydroxypropyl guar) for some various leave-on cosmetics and I noticed viscosity of my samples decreasing over time. So I made a 1.5% solution of Jaguar HP 105 where I adjusted the pH with Citric from ~10 to ~7 and used 0.7% euxyl pe 9010 (phenoxyethanol, ethylhexylglycerin) to preserve, then placed the sample in a 45C oven for 2 weeks. The viscosity across almost all shear rates dropped but it was especially noticeable at low rates (almost 50% reduction) and visually the sample looks thinner. I haven’t worked with HP guar much but is it normal to see a decrease that quickly, or is that an indicator of a bad batch/improper processing?
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