Cost Analysis
RONGHAO
06 / 08
Film Density Drives Cost per Bag
Resin is sold by weight, 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 lower strength — bamboo fiber's light weight comes from its natural fiber structure. Film strength and toughness are third-party load-tested, so cost per bag drops while strength and toughness stay high.