No, the density of cellulose is about the same as the density of other plastics, about 1-1.5 g/cc. For kitchen use, it does have the advantage over many other plastics that it's a thermoset; like teflon or phenolic, it won't melt, and unlike phenolic, it won't outgas toxic gases at ordinary temperatures (though who knows about the side products of the lignin-removal reaction). However, it is fairly hygroscopic, so it might not hold up as well as other plastics to water exposure, and especially to heat exposure while humid.