HOPEWAY fine powder PVA HWP-05S,HWP-20S and HWP-24S are specially designed for cement additives and building
industry.They improve plaster properties such as flexibility,water retention,and increase plaster viscosity as
well.In addition,they do not only reduce the friction of plaster but also enhance its working capacity and quali-
ty.(Prevent cracking and shedding of plaster,increase adhesion and smoothness of cement.) To mix desired
amount of PVA with cement well before water is added prevents the lumping of PVA.
As the PVA solution can be prepared with a solid content not exceed 30%, a considerable amount of water has
to be evaporated for film formation.This process can be speed up by adding lower alcohols such as methanol
ethanol and propanol to the solution. The quantity added is depending on the grade of PVA and alcohol used
The limit of compatibility is indicated by the incipient turbidity of PVA solution.
Viscosity of 4.00 wt % PVA Solution
Prepare three samples of 22 g each in a 600 ml beaker in accordance with the calculation formula.Add distilled
water to the concentrations of 3.8%, 4.0%, and 4.2% and then let it swell for 30 minutes.