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Polyvinyl alcohol (PVOH, PVA, or PVAl) is a water-soluble synthetic polymer. It has the idealized formula [CH 2 CH(OH)] n . It is used in papermaking , textile warp sizing , as a thickener and emulsion stabilizer in polyvinyl acetate (PVAc) adhesive formulations, in a variety of coatings, and 3D printing .
PVA is a vinyl polymer. Polyvinyl acetate is prepared by the polymerization of vinyl acetate monomer (free-radical vinyl polymerization of the monomer vinyl acetate).
Typical cement fiber board is made of approximately 40-60% of cement, 20-30% of fillers, 8-10% of cellulose, 10-15% of mica. Other additives like above mentioned aluminium stearate and PVA are normally used in quantities less than 1%. Cenospheres are used only in low density boards with quantities between 10 and 15%.
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Animal glue was the most common woodworking glue for thousands of years until the advent of synthetic glues, such as polyvinyl acetate (PVA) and other resin glues, in the 20th century. Today it is used primarily in specialty applications, such as lutherie , pipe organ building , piano repairs, and antique restoration.
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The synthetic resin most commonly used in conservation, polyvinyl acetate (PVA), is used as a glue and a consolidant based upon its viscosity. The higher viscosity glues are considered to have better bonding abilities, while low viscosity PVAs are best as consolidants given their ability to penetrate an object.
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