Abstract
This paper analyses the influence of the grind percentage on some mechanical properties, obtained by the injection of different technical items, which are made of polyamide 6.6 Grivory HTV-3H1 noir 9205, polyamide 6.6 Grivory HTV-45H1 noir 9205 and polyamide 6.6 Grivory HTV-6H1 noir 9205. The specimens are made of the following compositions: new material 100%, new material 80% + grind 20%, new material 60% + grind 40%, new material 40% + grind 60%, new material 20% + grind 80% and grind 100%. The mechanical properties were measured using tensile tests, the Izod impact test and the Shore Durometer hardness test. It has been observed that the hardness of the three tested polymers is hardly influenced by the increase in grind percentage. The shock resistance decreases along with the increase in the grind percentage, and the tensile strength at break increases along with the increase in the grind percentage. Keywords: polyamide 6.6 (PA 6.6), tensile tests, the Izod impact test, the Shore Durometer hardness test