... Item IndexBest QualityFirst QualityQualifierColor (Pt-Co) ≤31530Density ( 50 οC ) , g/cm31.13-1.161.13-1.171. ... 41-4340-44Viscosity ( 50 οC ) , mPa· s140-450≤500≤650Refractive Index1.500-1.508-Heating Loss (130 οC , 2h) , %0. ... 3-Heat stability index ( 175 οC, 4h, nitrogen 10L/h) HCl ... 510-1.5131.505-1.513-Heating Loss (130 οC , 2h) , %0.30.50.8Heat stability index ...