Hi Somayeh,

poly(vinyl alcohol) density depends on the level of crystallinity within the sample, which in turn is typically attributed to the degree of hydrolysis in the sample. Ranges of between 1.19 - 1.35 g/cm^3 are reported in literature at 25 degC.

Note however this may be different to your product bulk density, depending on how the PVA has been processed. For example, a spray dried sample of PVA may have a bulk density of much less than 1 g/cm^3 whilst an extruded sample would be more inline with the aforementioned values. Take this into consideration based on what your application is as it is not clear from your question.

Regards,

Ian

Density of poly(vinyl alcohol) is 1.19 g/cm3

between 1.19 - 1.31 g/cm^3

Amorphous density at 25oC: 1.26 g/cm3.

Crystalline density at 25oC: 1.35 g/cm3.

http://www.polymerprocessing.com/polymers/PVOH.html

Amorphous density at 25oC: 1.26 g/cm3.

Crystalline density at 25oC: 1.35 g/cm3.