Open Access

Table 1

Gel strength codes of Bottle testing method are listed below.

Code Gel type Gel behavior in bottle
A No detectable gel The gel solution appears to have almost the same fluidity as an initial solution
B Highly flowing gel The gel is comparatively slightly more viscous
C Flowing gel The gel flows up to the cap upon inversion
D Moderately flowing gel A small portion of gel does not flow to the cap upon inversion
E Barely flowing gel A small portion of gel slowly flows to the cap upon inversion
F Highly deformable non-flowing gel No gel flow upon inversion (gel flows to just short of reaching the bottle cap)
G Moderately deformable non-flowing gel The gel flows approximately halfway upon inversion
H Slightly deformable non-flowing gel Only the gel surface deforms upon slightly inversion
I Rigid gel There is no gel surface deformation on the inversion
J Ringing rigid gel A tuning-fork-like mechanical vibration can be felt after the bottle is tapped

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