Quality of Leather Using Vegetable Tannins Extract of Acacia Mangium Bark from Waste of Industrial Plantation

Abstract

The purpose of this study was to determine the characteristics of leather using vegetable tanning ingredients from the bark of Acacia mangium Willd. Tanning agent ingredients are provided in the form of bark powder and extract. The first phase of the preparation of the bark into powder and the second stage is the extraction of tannin from A.mangium bark. Extraction using water at 1000C for 30 minutes then evaporated so that tannin extract was obtained. Then the second stage is carried out the tanning process using both materials. Data analysis uses paired two sample for means T-test. The results of statistical analysis showed significant differences in the characteristics of the leather produced. Chemical analysis of leather tanned using A.mangium bark obtained moisture content of 16.76%, ash of 3.42%, tannin bound 18.99% and degree of tanning 38.21% while chemical analysis of leather tanned using tanneries A.mangium bark extract which is moisture content 16.03%, ash 4.18%, bound tannin 32.41% and 84.82% tanning degree. The physical properties of leather using A.mangium bark powder were tensile strength 493.84 kg / cm2, elongation 34.94%, zwik strength / lastability 6.66 mm (leather cracked). Compared to the characteristics of leather using tanner A.mangium bark extract, tensile strength was 254.32 kg / cm2, elongation 44.39%, zwik / lastability strength 8.63 mm (leather not cracked).