salam.khubi azizam.etefaghi pageto didam.rotbato nemidunam vali age beine polymer va nasaji mundi shak nakon ke polymer tu iran bishtar be kar miad.be ebarati aslan kari vase nasaji nist albate baz takid mikonam too iran.man polymere amirkabir mikhunam age soali dashti dar khedmatam.movafagh bashi.