Physical-mechanical and physical-chemical tests of red tilapia leather

Abstract

Physical-mechanical and physical-chemical tests were carried out on red tilapia leather. They were distributed in a completely randomized design with two treatments: T1 = longitudinal body of proof; T2 = transversal body of proof. It was used the EMIC dynamometer for the tests of resistance to traction and elongation and the progressive tearing, with the speed of 100±20mm/min away between the charges, in an acclimatized room (±23°C and relative humidity of 50%) during 24 hours. The thickness of the analyzed leathers ranged from 0.61 to 0.75mm, without differing between the analyzed ways. The leather demonstrated a higher resistance to traction in the transversal direction (25.89N/mm2) (P<0.01), when compared to the longitudinal one (14.20N/mm2). However, the elongation was significantly higher (P<0.05) in the longitudinal direction (80.8%) when compared to the transversal (62.6%). There was no significant difference for the progressive tearing between the treatments (longitudinal = 18.56N/mm; transversal = 21.90N/mm). The leather demonstrated a content of 3.8% of chromium oxide, 15.1% of grease, and pH and difference value of 3.5 and 0.5, respectively. The values in the resistance and physical-chemical tests shown by the leather indicate that it may be used for clothing and leather artifacts in general.