Cost Analysis
RONGHAO
06 / 08
Film Density Drives
Cost per Bag
Resin is sold by weight, but bags are made by volume: 1 kg ÷ density = usable volume. The lower the density, the more bags you get
Bamboo Fiber Masterbatch
Bamboo Fiber Masterbatch
0.98
g/cm³
1,000 g ÷ 0.98 =
1,020 cm³
Starch Masterbatch
Starch-based Masterbatch
1.30
g/cm³
1,000 g ÷ 1.30 =
769 cm³
Starch density typically 1.25–1.35; midpoint used here
Volume comparison → bag-count gap
1,020
÷
769
=
1.33x
Extra yield per kg, bamboo fiber
+33
%
In other words: if starch-based resin makes
100 bags
, the same weight of bamboo fiber makes
133 bags
.
Lower density doesn't mean a weaker bag
— our bags passed third-party load testing, so the cost per bag drops without giving up strength.