Polypropylene Plastic Strapping - Semi Automatic Machine Grade Item Code: Type: Sold By Quantity Strapping Polypropylene Plastic Machine Grade - For Semi Automatic Description Semi Automatic Machine Grade Polypropylene strapping is the most commonly used and least expensive of all strapping materials. It is light and easy to apply and recycle; best for bundling, carton closing, carton reinforcement and unitizing. Semi Automatic strapping lacks the stiffness required for full track machines but is excellent for semi automatic machines and small arch machines with 96" total circumference or less. Semi Automatic strapping is closed using a heat seal. Stock color available: White. Special order colors available: Clear, Yellow, Black.