Variety model
(1) Isotactic polypropylene, atactic polypropylene and syndiotactic polypropylene
The polypropylene molecule contains a methyl group, which is classified into isotaetic polypropylene, atactic PolyPropylene, and syndiotatic Polypropylene according to the position of the methyl group . The methyl group is arranged on the same side of the main chain of the molecule as isotactic polypropylene; if the methyl group is disorderly distributed on both sides of the main chain of the molecule, it is called atactic polypropylene; when the methyl groups are alternately arranged on both sides of the main chain, the syndiotactic Polypropylene. Generally, in the polypropylene resin produced, the content of the isotactic structure (called isotacticity) is about 95%, and the rest is random or syndiotactic polypropylene. The polypropylene resins currently produced in China are classified according to the melt index and the additives added. The main types of polypropylene resins are listed in Table 22-16.
Table 22-16 Main models of polypropylene
type     number | Melt index (MI) g/10min | Wait    Regulation % | Pull  Strength MPa (kgf/cm 2 ) | ||
blow    Plastic | 1200 1230 | 0.4 to 0.7 0.4 to 0.7 | 96~98 96~98 | 25.5 25.5 | (260) (260) |
Note    Plastic | 1700 1400 1300 1730 | ||||
Ultralight weight shell and lining fabrics use interlocking Y-shaped nylon fibers to enhance the performance of the DWR (durable water repellent) finish
800-fill-power Traceable Down (goose down traced from parent farm to apparel factory to help ensure the birds that supply it are not force-fed or live-plucked)
Variegated channel construction stabilizes goose down; side panels with narrow channels provide shape and reduce bulk
Contoured fit accommodates movement while maintain loft and reducing drafts
Center-front zipper has interior storm flap and wicking kissing-welt zipper garage at chin for next-to-skin comfort
Two zippered handwarmer pockets and one zippered chest pocket have zipper garages; Jacket self-stuffs into chest pocket with carabiner clip-in loop, as well as into the left handwarmer pocket to become a travel pillow
Elastic-bound cuffs and hem with single drawcord adjustment seal in warmth
Premium down provides superb insulation and warmth.
Back designed with a seam to create a slim, fitted cut.
Slightly longer hem and shorter collar that won't rub against the face.
Compact size and included carrying pouch for easy transport.
Light Down Touch Jacket,Women Light Down Touch Jacket,Winter Light Down Touch Jacket,Ultra Light Down Touch Jacket
Shijiazhuang Damei Co., Ltd. , https://www.dameijacket.com