... of material that is injected is referred to as the shot. The injection time is difficult to calculate accurately due to the complex and changing flow ... Tough, transparent, high cost Handles, eyeglass frames Polyamide 6 (Nylon) PA6 Akulon, Ultramid, Grilon High strength, fatigue resistance, chemical ... the cost. The additional cost for side-cores is determined by how many are used. However, the number of ...