Tingi (Ceriops tagal) bark was highly potential as tanning materials due to high tannin concentration. The aim of the study was to determine the characterization of properties of tanning material made from tingi bark, including the tannin levels, the non-tannin levels ABSTRAKKulit kayu tingi (Ceriops tagal) berpotensi sebagai bahan penyamak nabati mengingat kandungan tanin yang tinggi. Tujuan penelitian adalah untuk mengetahui karakterisasi bahan penyamak tingi terhadap kadar tanin, kadar non tanin, tipe tanin, absorpsi larutan tingi dan spektrum FTIR. Metode yang dilakukan meliputi pembuatan ekstrak larutan dengan sistem counter current, preparasi larutan umpan, pemekatan, pembentukan serbuk menggunakan Rotavapor-151 Standard, dan pengujian. Hasil karakterisasi kulit kayu tingi menunjukkan kandungan tanin 70,91% dan kadar non tanin 10,63%. Tanin tingi termasuk golongan condensed tannin tipe procyanidin dan absorpsi larutan tingi didapatkan panjang gelombang maksimum 490 nm. Data spektrum FTIR tanin tingi menunjukkan adanya gugus hydroksil (ⱱO-H; ⱱN-H) pada area (3467,025) PENDAHULUANIndonesia kaya akan sumber daya alam yang menyimpan sumber tanin sebagai bahan penyamak nabati. Pohon tingi (Ceriops tagal) merupakan salah satu sumber tanin yang sangat potensial dan pohon ini termasuk jenis mangrove (Rusila et al., 2012) dengan sumber tanin diantaranya terdapat pada kulit kayunya.Pohon tingi banyak tumbuh di berbagai daerah di Indonesia, diantaranya di Jawa Tengah, Jawa Timur, Sulawesi, dan Kalimantan terutama di daerah pinggir pantai. Kayu tingi dimanfaatkan sebagai kayu bakar sedangkan kulit kayunya digunakan sebagai bahan pewarna batik untuk campuran warna soga (kayu tegeran, kulit kayu tingi, dan jambal). Kulit kayu tingi memberi

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Fatliquor could change physical properties of leather, which make it softer, more elastic, flexible and give smooth grain surface. This research was conducted to observe the influence of fatliquor addition on physical characteristics of nila skin for shoe upper. The physical characteristics in this research, consisted of tensile strength, tear strength and elongation at break. The fatliquor was put into the leather with the amount of 4%, 6% and 8%. Respectively, the results showed that the addition of fatliquor could improve the physical properties of nila skin. More fatliquor, could rise the physical properties value of nila skin. The optimal amount of 2 fatliquor was 4%, which resulted in tensile strength value of 233,96 kg/cm , 70% for elongation at break and 36,08 kg/cm for tear strength value, and fulfill the standard requirement of Acceptable Quality Levels in Leathers.

Pengaruh perbedaan jumlah penambahan binder uretan dan berbagai motif embossing terhadap kualitas kulit reject The influence of differences in addition amount of urethane binder and various embossing motives to the quality of rejected leather