Polyvinyl Alcohol (PVA)
Polyvinyl alcohol appears as odorless white to cream-colored granules or powder. Pure aqueous solutions are neutral or faintly acid and subject to mold growth. pH (4% aqueous solution): 5-8. Strongly hydrophilic. (NTP, 1992);Odourless, tasteless, translucent, white or cream-coloured granular powder;COLOURLESS-TO-WHITE SOLID IN VARIOUS FORMS.
(C2H3OR)nwhere R = H or COCH3;(CH2CHOH-)n;CH2CHOH;C2H4O
644 °F at 760 mm Hg approximately (NTP, 1992);644 °F at 760 mm Hg /approximately/
442 °F (decomposes) (NTP, 1992);>200 ℃; other melting points: 212-267 ℃
175 °F (NTP, 1992);175 °F (79 ℃) (open cup);79 ℃ o.c.
1.329 (NTP, 1992);1.91 to 1.31;1.19-1.31 g/cm₃
Soluble (NTP, 1992);Soluble in water; sparingly soluble in ethanol;Soluble in water;Solubility in water: good;Water solubility increases as molecular weight decreases;Slightly soluble in ethanol, but insoluble in other organic solvents;Essentially soluble in hot and cold water, but those coded 20-105 require alcohol-water mixtures; Insoluble in petroleum solvents;Practically insoluble in animal and vegetable oils; insoluble in aromatic hydrocarbons, esters, ether, acetone; practically insoluble in chlorinated hydrocarbons;Solubility in water: good
Stable under recommended storage conditions.
/p>4,8 to 5,8 mPa.s (4 % solution at 20 ℃) corresponding to an average molecular weight of 26 000-30 000 Da