GHS Classification Guidance for the Japanese Government

the dependence of liquid viscosity on temperature is not linear in most cases, it is
preferable to confirm the viscosity of the substance at 40℃ by referring to chemical
technology books such as the Chemical Technology Handbook, or to estimate it by
using the empirical formula recognized for the substance. The basic data such as the
value of viscosity and measuring temperature and their references shall be given in
“Grounds”.
c) liquids and solids, not gases, are subject to classification. Since aspiration hazard
concerns, not aspiration of substances suspended in gas phase, but to accidental
aspiration of liquids and solids, aerosol/dust/mist substances are judged by referring
to the UN GHS second revised edition 3.10.1.6.4, and considering nature of
substances, performance of the containers in which the substances are provided
(spray can, etc.), etc. (Substances aspirated into respiratory tract/respiratory system
while suspended in gas phase are placed in “Not applicable”.).
d) Here, “hydrocarbon” means substances consisting of carbon and hydrogen including
nonlinear one, but halogenized hydrocarbon is not included.
(General notes regarding kinematic viscosity)
(Note 1)In many cases, viscosity is indicated in cgs units(dyn・s/cm 2 = poise(or P)).
Use the following conversion formula when appropriate.
1 poise = 0.1Pa･s
(Note 2)The classification criteria refer to kinematic viscosity. The conversion formula
between dynamic viscosity and kinematic viscosity is indicated below. It
should be noted that both of SI unit and CGS unit are used in the formula.
Dynamic viscosity (mPa･s) / Density (g/cm 3 ) = Kinematic viscosity
(mm 2 /s)
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