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●Good film forming property, without cracking
●Anti-adhesive release effect, even when thinly applied
●Impermeability of PVA film to the organic material used, e.g. styrene
●The PVA film which adhesives to the cast article can be peeled off by hand
Add 25 ml of N/10 NaOH solution, seal the flask and leave it still for at least 2 hours in room temperature.Add
accurately 25 ml of N/10 H2SO4 solution and titrate back the excess amount of H2SO4 solution present with
N/10 NaOH solution using phenolphthalein as the indicator, until the solution appears in pale pink color.
The volume of N/10 NaOH solution consumed in this titration is a ml. Carry out a blank test separately; the
volume of N/10 NaOH solution consumed in this blank test is b ml.
A : wt % of residual acetate groups
B : mole % of residual acetate groups
C : mole % of hydrolysis of the sample
S : weight of the initial sample
P : Purity =100 - volatile of the sample - NaAc content of the sample
F : concentration factor of N/10 NaOH solution
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