PE(Polyethylene):
Specifications:
- Transparent, lightly dull, glossy and soft surface.
- Good water-proof and steam anti-humidity.
- Poor water-proof for O_², CO₂, N₂ and grease. 
- Bearing the high temperature (below 230ºC) in the short time.
- Distension and damage when contacting the essential oil or detergents, such as, alcohol, acetone, H₂O₂ and so on.

The bag in put inner PP bags with its effect of anti-humidity.

HDPE: High-density polyethylene (HDPE).The same the participle of polyethylene (with the high density) under the low pressure with the catalysis system, such as, crom/silic catalyst and so on. They are used to produce the nylon bags, plastic device. With its brittle characteristics and dark white.
LDPE: Low-density Polyethylene (polyethylene with its low density). With its softt and transparent characteristics.