Ubwoko bwa polypropylene.

Molekile za polypropylene zirimo amatsinda ya methyl, ashobora kugabanywamo polypropylene ya isotactic, polypropylene ya atactic na polypropylene ya syndiotactic hakurikijwe imiterere y'amatsinda ya methyl. Iyo amatsinda ya methyl ashyizwe ku ruhande rumwe rw'umuyoboro mukuru, yitwa polypropylene ya isotactic; niba amatsinda ya methyl akwirakwijwe ku mpande zombi z'umuyoboro mukuru, yitwa polypropylene ya atactic; iyo amatsinda ya methyl ashyizwe ku mpande zombi z'umuyoboro mukuru, yitwa polypropylene ya syndiotactic. Mu ikorwa rusange rya polypropylene resin, ingano y'imiterere ya isotactic (yitwa isotacticity) ni hafi 95%, naho andi ni polypropylene ya atactic cyangwa syndiotactic. Polypropylene resin ikorerwa mu Bushinwa ubu ishyirwa mu byiciro hakurikijwe igipimo cyo gushonga n'inyongera zongewemo.

Polypropylene ya Atactic ni umusaruro ukomoka ku ikorwa rya polypropylene ya isotactic. Polypropylene ya Atactic ikorwa mu ikorwa rya polypropylene ya isotactic, naho polypropylene ya isotactic itandukanywa na polypropylene ya atactic hakoreshejwe uburyo bwo kuyitandukanya.

Polypropylene ya Atactic ni ibikoresho bya thermoplastic biremereye cyane kandi bifite imbaraga zo gukurura. Ishobora kandi guhindurwa nk'umupira wa ethylene-propylene.