scholarly journals The utilization of sugarcane bagasse, cassava peels and corn husks in handmade paper production

2021 ◽  
Vol 6 (1) ◽  
pp. 64-75
Author(s):  
Aminah Asngad ◽  
Santhyami Santhyami ◽  
Ardiyana Rahma Pertiwi ◽  
Carissa Rahmitasari
Keyword(s):  
Tensile Strength ◽  
Sugarcane Bagasse ◽  
Testing Machine ◽  
Raw Material ◽  
Tapioca Starch ◽  
Tear Strength ◽  
Handmade Paper ◽  
Corn Husk ◽  
Cassava Peels ◽  
Tear Resistance

High demands for trees as the raw material of paper can disrupt the stability of the environment. It is necessary to find alternatives from other materials which are more environmentally friendly. This study aims to determine the quality of paper made from combining sugarcane bagasse with cassava peels or with corn husks using PVAc or tapioca starch adhesives. A completely randomized 2 x 2 factorial design with five times replication was used. The parameters tested were the tensile and tear resistance of the paper using a micrometer and a universal testing machine. A sensory analysis from panelists was also conducted. The combination of J1P1 produced a paper with the highest tensile strength (11.30 MPa) and the highest tear strength (1.82 MPa). The combination of J2P2 produced a paper with the lowest tensile strength (10.35 MPa) and the lowest tear strength (1.62 MPa). Variance analysis showed that the type of adhesive used showed a significant result on both tensile and tear resistance but material choices and interaction between materials and adhesive choices was not significantly different from the result on both tensile and tear resistance. Sensory testing shows that the combination of J1P1 was preferred the most. It can be concluded that the combination of J1P1 appeared to be the best combination.Keywords: Handmade paper, sugarcane bagasse, cassava peels, corn husk, PVAc tapioca starch, adhesive

scholarly journals PENGARUH PENYAMAKAN ZIRKONIUM TERHADAP UJI KEKUATAN TARIK, UJI KEKUATAN SOBEK, UJI KEMULURAN DAN UJI SUHU KERUT PADA BERBAGAI JENIS KULIT IKAN (The Effect of Zirconium Tanning Against Tensile Strength Test, Strength Test of Tear, Glide Test, and Wrinkle Temperature Test on Different Fish Types)

2018 ◽  
Vol 13 (2) ◽  
pp. 105
Author(s):  
Rokhmah Hergiyani ◽  
Y. S. Darmanto ◽  
Lukita Purnamayati
Keyword(s):  
Tensile Strength ◽  
Negative Impact ◽  
Strength Test ◽  
Collagen Fibers ◽  
Raw Material ◽  
Tear Strength ◽  
Complex Processes ◽  
Materials Used ◽  
The One ◽  
Physical Changes

Kulit ikan merupakan limbah perikanan yang dapat memberikan dampak negatif pada lingkungan. Salah satu cara untuk menanggulangi limbah tersebut adalah dengan proses penyamakan kulit. Penyamakan kulit adalah rangkaian proses yang sangat kompleks terjadi banyak perubahan fisik dan kimia di satu sisi, bagian yang tidak berguna dihilangkan dari kulit mentah untuk mendapatkan serat kolagen murni dan membuka struktur serat kolagen. Proses penyamakan yang tidak baik mengakibatkan kulit menjadi rusak, lemas, dan kebusukan, sehingga penanganannya dapat dengan cara menambah bahan penyamak untuk menguatkan dan menghindari kebusukan. Bahan penyamak yang digunakan yaitu zirconium. Tujuan penelitian ini adalah untuk mengetahui pengaruh penyamakan zirkonium terhadap uji kekuatan tarik, uji kekuatan sobek, uji kemuluran dan uji suhu kerut pada berbagai jenis ikan. Bahan baku yang digunakan adalah kulit ikan nila, kakap dan bandeng. Metode penelitian yang digunakan adalah experimental laboratories menggunakan Rancangan Acak Lengkap (RAL) dengan tiga kali ulangan dan  menggunakan analisa ragam ANOVA. Hasil uji menunjukan penggunaan zirkonium 7,5% terhadap kulit ikan nila, kakap, dan bandeng berpengaruh nyata (p<0,05) pada kekuatan tarik, kekuatan sobek, kemuluran dan suhu kerut pada karakteristik penyamakan. Penggunaan bahan penyamak zirkonium 7,5% terbaik dihasilkan oleh kulit ikan kakap pada uji kekuatan tarik 1675,84 N/cm2, kekuatan sobek 163,92 N/cm2 dan uji suhu kerut 103,45˚C sedangkan kemuluran untuk hasil terbaik pada kulit bandeng sebesar 28,74%, jadi setiap ikan mempunyai ciri kulit tersendiri pada setiap parameter uji. The skin of the fish waste is a fishery that can give a negative impact on the environment. One way of tackling the waste is by the process of tanning leather. Tanning is a very complex processes occur many chemical and physical changes on the one hand, the useless removed from rawhide to get pure collagen fibers and the open structure of the collagen fibers. The process of tanning is not a good result in the skin becomes broken, buckled, and corruption, so that responses can be with how to add ingredients to strengthen Tanner and avoid corruption. On the research of materials used i.e. Tanners used are zirconium.. The purpose of this research is to know the influence of zirconium tanning against test tensile strength, tear strength test, test and test temperature wrinkle elongation on various types of fish. The raw material used is leather fish tilapia, milkfish and snapper. Research methods used are experimental laboratories using Complete Random Design (RAL) with three-time repeats and a range of analysis using ANOVA. Test results showed the use of zirconium 7.5% against the skin of the fish, snapper, tilapia and milkfish influential real (p < 0.05) on the tensile strength, tear strength, elongation and wrinkle on temperature characteristics of tanning. The use of zirconium Tanner 7.5% best produced by skin test on a snapper 1675.84 tensile strength N/cm2, the strength of RIP 163.92 N/cm2 and test the temperature of the wrinkle 103,45 ˚ C while elongation for the best results on the skin of the banding of 28.74%, so each fish has its own skin characteristics on each test parameter.

scholarly journals Mechanical Properties for Elephant Dung and its Utilization as a Raw Material Composites Sheet: A Study

2021 ◽  
Vol 10 (1) ◽  
pp. 1-7
Author(s):  
Rohit Kumar ◽  
Ramratan . ◽  
Anupam Kumar ◽  
Rajinder Singh Smagh
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Impact Strength ◽  
Polymer Composite ◽  
Natural Fiber ◽  
Testing Machine ◽  
Raw Material ◽  
Weight Percentage ◽  
The Impact ◽  
Elephant Dung

Elephant dung is an excellent source of cellulosic fiber that is a basic requirement for paper making. But they contributed to very small percentage production of elephant dung. So, researchers are trying to find a new area of utilization of elephant dung fiber pulp as in reinforcement’s polymer composite. In this experiment element dung fiber pulp in the natural fiber component chemically treated with alkaline and soda AQ solution in this study, it has been aimed to use elephant dung fiber pulp in composite material and to study mechanical properties of the produced material. The produced composite samples were then characterized using tensile test, Izod impact test, thickness test. The fracture surface of the polymer composite sample was also inspected with the help of SEM. The content of elephant dung fiber pulp is varied (35%, 45%, 55%) weight percentage whereas the epoxy resin is varied (50%, 40%, 30%) percentage is kept constant 15% in hardener. The entire sample has been tested in a universal testing machine as per ASTM standard for tensile strength and impact strength. It is observed that composite with 35% fiber pulp is having the highest tensile strength of 4mm 6.445 Mpa and 8mm 11.80 Mpa. The impact strength of composite with 35% fiber pulp washes highest than 45% to 55% dung fiber pulp. This produces composite sheet will be used for the surfboards, sporting goods, building panel this not only reduces the cost but also save from environmental pollution.

Synthesis, Characterization and Properties of Poly (ε-Caprolactone) Glycol Based Casting Polyurethane Elastomers Containing Nano-Size Sio2 Particles

2010 ◽  
Vol 148-149 ◽  
pp. 1394-1399
Author(s):  
Xiao Dong Chen ◽  
Tie Jun Ma ◽  
Hai Zhang ◽  
Rong Sheng Chen
Keyword(s):  
Tensile Strength ◽  
In Situ Polymerization ◽  
Testing Machine ◽  
Tensile Modulus ◽  
Polyurethane Elastomers ◽  
Tear Strength ◽  
Dynamic Mechanical ◽  
Nano Sio2 ◽  
Polyurethane Composites ◽  
The Impact

Poly(ε-caprolactone) (PCL) glycol based casting polyurethane elastomers (CPUE) filled with nano-SiO2 particles within different surface properties were synthesized by mean of in-situ polymerization. The macro-static/dynamic mechanical properties and micro-dispersed state were characterized by an electronmechanical universal testing machine, a durometer, a rubber resilience experimental machine, a dynamic-mechanical analyzer (DMA) and a scanning electron microscope (SEM). The tensile modulus at 100% and 300%, elongation at break, tensile strength and tear strength of PCL urethane nanocomposites increased substantially in the presence of a certain amount of nano-SiO2 compared with their pristine state. Furthermore, the tensile strength and tear strength at 100 of the PCL CPUE with 5% nano-SiO2 pretreated by γ-glycidochloropropyl methyl trimethoxy silane (SI-CA) were 1.50 and 1.94 times than those of the pure PCL CPUE, respectively. The addition of the nano-SiO2 had little effect on the hardness, but the impact resilience decreased slightly. DMA analyses showed that the loss factor peaks of two nano-SiO2 polyurethane composites were higher obviously than the pure PCL CPUE and the glass transition temperature （Tg）of the two nano-SiO2 polyurethane composites increased to higher temperature region. SEM fractographs showed that the surface treatment by the optimum silane coupling agent influenced the dispersibility of nano-SiO2 in the PCL CPUE distinctly. The agglomerating phenomenon, and even some nano-agglomerates with more than 1 μm diameter can be observed in the PCL CPUE with 5% untreated nano-SiO2, but the nano-SiO2 pretreated by SI-CA was dispersed in the PCL CPUE in nano-scale.

scholarly journals POTENSI RUMPUT LAUT Eucheuma cottonii SEBAGAI BAHAN BAKU PEMBUATAN KERTAS KANTONG KRAFT (Eucheuma cottonii Seaweed has a good Potential as Raw Material For Making Kraft Paper Bags)

2019 ◽  
Vol 14 (2) ◽  
pp. 81
Author(s):  
Ryan Ariefta ◽  
Eko Nurcahya Dewi ◽  
Romadhon Romadhon
Keyword(s):  
Tensile Strength ◽  
Raw Material ◽  
Resistance Test ◽  
Seaweed Extract ◽  
Kraft Paper ◽  
Randomized Design ◽  
Grammar Tests ◽  
Eucheuma Cottonii ◽  
Tear Resistance

Ekstrak selulosa yang berasal dari rumput laut Eucheuma cottonii dapat dijadikan sebagai bahan substitusi pembuatan kantong kertas kraft yang biasanya dibuat dari pulp kayu. Tujuan dari penelitian ini adalah untuk mengetahui kualitas kantong kertas kertas kraft dari ekstrak rumput laut E. cottonii apabila dibandingan dengan kertas kraft berstandar SNI. Rumput laut         E. cottonii yang digunakan berasal dari pantai Krakal, Gunung Kidul, Jogjakarta. Pembuatan kertas kraft dilakukan dengan ekstraksi selulosa dari E. cottonii diikuti dengan pemasakkan hingga hancur, pencetakan dan pengeringan sehingga berbentuk pulp lembaran. Rancangan percobaan yang digunakan yaitu Rancangan Acak Lengkap (RAL), dengan 1 faktor yaitu konsentrasi ekstrak rumput laut E. cottonii dengan tiga taraf yang berbeda yaitu  15%, 20%, dan 25%.  Parameter pengujian yang dilakukan adalah  ketahanan tarik, ketahanan sobek, daya regang dan derajat kecerahan (CIELAB). Data parametrik yang didapatkan  diuji dengan sidik ragam (P<5%), dilanjutkan dengan uji Beda Nyata Jujur (BNJ) untuk melihat perlakuan yang berbeda. Hasil yang didapatkan pada uji ketahanan tarik pada konsentrasi 15%, 20% dan 25% berturut - turut, yaitu 1,80 ± 0,22 kN/m; 5,54 ± 0,42 kN/m dan 7,33 ± 1,28 kN/m,  ketahanan sobek 737,62 ± 91,15 mN; 2260,00 ± 173.18 mN dan 2991,90 ± 525.04 mN,   daya regang : 3,86 ± 1,78%; 7,24 ± 0,83% dan 7,08 ± 2,15%, untuk uji gramatur :  70 gram; 73,09 gram dan 75,75 gram. Hasil uji perbandingan kualitas kertas kraft paper bag dari  subsitusi ekstrak selulosa 20% dan 25% telah memenuhi SNI, sedangkan pada konsentrasi 15% belum memenuhi SNI. Cellulose extract from Eucheuma cottonii seaweed can be used as a substitute for making kraft paper bags.  Kraft paper are  usually made from wood pulp. The purpose of this study was to determine the quality of kraft paper bags from seaweed extract E. cottonii when it compared to SNI  kraft paper. The E. cottonii seaweed used comes from Krakal beach, Gunung Kidul, Jogjakarta. The kraft paper was first  made by extracting cellulose from E. cottonii, it was   cooked,  crushed, printed , dried and finally it was   formed to  pulp sheet. The experimental design used was Completely Randomized Design (CRD), with 1 factor concentration of seaweed extract E. cottoni with three levels concentration  15%, 20%, and 25% respectively.  The test parameters performed were tensile resistance, tear resistance , tensile strength and brightness (CIELAB). Data were analysed using Anova  and tested continued Honestly Significant Different test (HSD). The results obtained in the tensile resistance test at a concentration of  15%, 20% and 25% were  1.80 ± 0.22 kN / m; 5.54 ± 0.42 kN / m and 7.33 ± 1.28 kN / m, in the tear resistance test were  737.62 ± 91.15 mN; 2260.00 ± 173.18 mN and 2991.90 ± 525.04 mN, the tensile strength were 3.86 ± 1.78%; 7.24 ± 0.83% and 7.08 ± 2.15%, for successive grammar tests:  70 grams; 73.09 grams and 75.75 grams. The comparison test results of the quality of paper bag kraft paper from cellulose extract 20% and 25% have met SNI, while at a concentration of 15% have not met SNI.

scholarly journals KAJIAN PENGARUH KONSENTRASI Rhizopus sp. SEBAGAI AGEN PENGIKIS PROTEIN TERHADAP MUTU KULIT IKAN GURAMI TERSAMAK

2013 ◽  
Vol 2 (2) ◽  
Author(s):  
Ratri Nur Hayati
Keyword(s):  
Tensile Strength ◽  
Protease Activity ◽  
Oil Content ◽  
Economic Value ◽  
Consumer Acceptance ◽  
Raw Material ◽  
Shrinkage Temperature ◽  
Tear Strength ◽  
Randomized Design ◽  
Rhizopus Sp

The study aimed to assess the effect of protease activity of Rhizopus sp. as a bating agent on the tanned carp leather quality, and their use for commercial leather products. The study was designed with a completely randomized design with four treatment, namely: the concentration of protease from Rhizopus sp. 0.5% (a1), 1.0% (a2), 1.5% (a3) and palkobat 1.0% (a4/control) with 3 replications. Parameters were observed that is (1) protease activity of Rhizopus sp and palcobat; (2) Thickness (mm), tensile strength (N/cm2), tear strength (N/cm), elongation (%), enervation (mm), shrinkage temperature (ºC), fat/oil content (%) of tanned leather; and (3) level of consumer acceptance (%) and added valuead of comercial leather product. The data of tanned leather quality is then compared with SNI 06-4586-1998 concenring freshwater snake skin leather and chrome Burk’s Bay (1996) on the raw material quality leather products. The test results of protease activity of Rhizopus sp. = 7.97 mg/50mg/ jam and palkobat = 13.62 mg/50 mg/hour. The results of the analysis of tanned leather carp qulity sample from each treatment and comparison with the SNI as follows: (1) Thickness: 0.41 (a1), 0.38 (a2), 0.43 (a3), 0.41mm (a4) and ≥ 0.22 (SNI 06-4586-1998). Tensile strength: 1682.67; 1818.17; 1195.57; 1670.55 and 1,000N/cm2 (SNI). Tear strength: 314.87; 310.95; 332.06; 462.22, and 150.00 N/cm (SNI). Elongation: 93.33; 62.67; 56.67; 97.33, and <30.00% (SNI). Enervation: 1.87; 2.20; 1.63, 2.49, and ≥ 2.0 mm (Burk’s Bay, 1996). Shrinkage temperature: 74.00; 95.33; 96.33; 97.33, and ≥ 70.33ºC (SNI). The fat/oil content: 7.84; 8.17; 5.25; 8.49, and 2.00 to 6.00% (SNI). All treatments were tested has met the SNI quality, except elongation and fat/oil content. The level of consumer acceptance of the Oval HP Cover that is (1) aspects of the display (76.67% like and 23.33% dislike), (2) the use of convenience (66.67% like and 33.33% dislike ), and (3) price (63.33% accepted and 23.67 reject). The level of consumer acceptance of the Box Cover HP models that is (1) aspects of the display (80.00% like and 20.00% dislike), (2) convenience of use (86.67% like and 13.33% dislike), and (3) price (66.67% accepted and 33.33% reject). The economic value of tanned carp leather as big as Rp 160.000/20 leather pieces and leather products as big as Rp 420,000 per 15 pieces of product.

The Tear Strength of Vulcanizates

1960 ◽  
Vol 33 (5) ◽  
pp. 1438-1481 ◽  
Author(s):  
Primus Kainradl ◽  
Franz Handler
Keyword(s):  
Tensile Strength ◽  
Test Specimen ◽  
Testing Machine ◽  
Propagation Rate ◽  
Careful Consideration ◽  
Measuring Instruments ◽  
Razor Blade ◽  
Tear Strength ◽  
Test Speed ◽  
Tear Propagation

Abstract 1) The force acting upon the jaws of the tear testing machine is always measured in tear strength tests and its value serves as a criterion of the tear resistance. This force, measured at the instant of completion of the tear, is made up of the force necessary for tear propagation in the notch together with the force needed to produce the elongation of the material in the notched cross section. The proportion of these two components is quite different, depending on the form of the testpiece. The effort should be made to attain the highest possible stress concentration in the notch with the lowest possible elongation in the rest of the testpiece, so that the force that operates on the jaws will represent chiefly the force needed for tearing. 2) Two principle groups of testpieces are to be distinguished: those which show a tear propagation rate determined by the speed of the jaws and those with spontaneous tear propagation. 3) For the case of a thin cut with a razor blade in the testpiece, the tear which occurs upon stretching should not be thought of as a tear growth of the cut, but is to be regarded as a new tear initiation. 4) Several pieces of equipment with electronic force measuring instruments were devised to study the effect of jaw speed. The measurements were performed at jaw speeds up to 18 m/sec. 5) The tensile strengths of the vulcanizates which were studied fall off at first with increase in speed and then rise at high speeds. 6) The curve for tear strength as a function of speeds is similar to that for tensile strength. After passing through a minimum, the tear strengths of the vulcanizates generally rise for the higher speeds. 7) This increase in tear strength was especially large for the synthetic polymers studied. At a test speed of 18 m/sec, their tear strengths reached values several times larger than for lower speeds. 8) An explanation of the changes in tensile strength and tear strength with speed and temperature may be found in orientation and crystallization at high elongation on the one hand and in the flow processes on the other. 9) Changes in relative ratings appear when we compare the results of tear strength measurements on various vulcanizates because the testing speed affects them to different extents. 10) The material becomes anisotropic because of varying high local elongation and the accompanying orientation in the tear test specimen, and the resistance to tear propagation becomes dependent upon direction. The ruptured surfaces of the sample as well as the force/time diagram frequently show a saw-tooth character (“knotty tear”). Smooth or knotty tear occurs for every compound depending upon the testing conditions. 11) The ordinary tear strength test is, therefore, a test of structural strength, which is made up of the true tear propagation load, needed for the tearing, together with the load required for the deformation of the legs between jaws. Test speed and temperature exert different effects on each of these components. From what has been said, it follows that in the use of a given article, it is necessary that we give careful consideration to the sevice conditions, and hence we are not yet in a position to make a generally applicable recommendation for the form of the test specimen.

scholarly journals Mechanical properties of polyester composite reinforced fibers hybrid bamboo - Musa acuminata stem fiber as raw material of rear bumper vehicle

2021 ◽  
Vol 8 (3) ◽  
pp. 001-007
Author(s):  
Sujita Darmo Darmo ◽  
Rudy Sutanto Sutanto
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Elasticity Modulus ◽  
Low Cost ◽  
Testing Machine ◽  
Musa Acuminata ◽  
Bamboo Fiber ◽  
Raw Material ◽  
Polyester Composite ◽  
Polyester Composites

In the present study fiber hybrid (bamboo fiber and Musa acuminata stem fibers (MASF) were reinforced polyester composite, for enhancing mechanical properties. The natural fibers composite has gained its importance due to its low cost, substitute for artificial fiber, low price, able to reduce sound, environmentally friendly, has a low density, good fit and ability to absorb impact energy. It’s possible to use it as a vehicle accessory such as a rear bumper vehicle. This study aims to investigate the tensile stress-strain, elasticity modulus and the microstructure of fracture of polyester fiberglass composite reinforced bamboo fiber and MASF hybrid. Polyester matrix type 157 is used BQTN and G3253T, MEKPO catalyst. The mechanical properties test was carried out by universal testing machine (UTM) test instrument, observing the microstructure of the occurrence of fracture by using scanning electron microscope (SEM). The test specimens produced the vacuum infusion method. The results of this study indicate that the addition of more MASF and the outer layer content can increase the tensile strength, elasticity modulus of polyester composites reinforced MASF with woven, random arrangement is better than that of polyester composites reinforced bamboo fiber. So that in the manufacture of polyester composites reinforced hybrid fiber the use of more MASF than bamboo fiber can provide better tensile strength and elasticity modulus. The configuration with the outer MASF layer can also increase the value of tensile strength, elasticity modulus on the specimen compared to the configuration with bamboo fiber outside. The microstructure of fracture for fiber for each configuration of MASF content there are long fibers and also in bamboo fibers there are fibers that are pulled out. The diameter of the bamboo fiber reinforcement is larger so that the load transfer is not as effective as MASF.

scholarly journals The effect of bagasse fibers material with pumice as a partial substitution of coarse aggregate to increase compressive strength and tensile strength on lightweight concrete

2021 ◽  
Vol 878 (1) ◽  
pp. 012046
Author(s):  
F Samosir ◽  
L E Hutabarat ◽  
C C Purnomo ◽  
S P Tampubolon
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Sugarcane Bagasse ◽  
Sugar Cane ◽  
Coarse Aggregate ◽  
Lightweight Concrete ◽  
Fiber Material ◽  
Raw Material ◽  
Partial Substitution ◽  
Sugarcane Bagasse Ash

Abstract Based on data from the Indonesian Sugar Plantation Research Center (P3GI) bagasse produced 32% of the weight of ground sugar cane. Data obtained from the Indonesian Sugar Expert Association (IKAGI) shows the number of sugar cane milled by 57 sugar mills in Indonesia reaches around 30 million tons, so the bagasse produced is estimated to reach 9,640,000 tons. However, as much as 60% of the sugarcane bagasse ash is used by sugar factories as fuel, raw material for paper and others. Therefore, it is estimated that 40% of the sugarcane bagasse ash has not been utilized. In this research sugarcane bagasse used as fiber material with using pumice partial substitutions for coarse aggregate to increase compressive strength and tensile strength of lightweight concrete. The test is conducted on specimens with a diameter of 15 cm and a height of 30 cm at the age of 28 days. Result of test shows lightweight concrete with 0.25% sugarcane bagasse reach optimum compressive strength at 13.74 MPa, compare to 12.83 MPa without sugarcane bagasse; 13.40 MPa with 0.5% sugarcane bagasse, and 11.61 MPa with 1% sugarcane bagasse. Furthermore, the results of the tensile strength test show a significant increase up to 0.25% bagasse fibers reach 1.81 MPa, compare to 1.51 MPa without sugarcane bagasse; 1.72 MPa with 0.5%; and 1.56 MPa with 1% sugarcane bagasse.

scholarly journals Technology of Free Chrome Tanning Process: Optimal Level of Formaldehyde as Tanning Agent for Mondol Stingray (Himantura gerrardi)

2020 ◽  
Vol 20 (3) ◽  
pp. 277-286
Author(s):  
Laili Rachmawati ◽  
Emiliana Anggriyani ◽  
Nur Mutia Rosiati
Keyword(s):  
Tensile Strength ◽  
Optimal Level ◽  
Raw Material ◽  
Shrinkage Temperature ◽  
Tear Strength ◽  
Chrome Tanning ◽  
Tanning Process ◽  
High Level

Chrome (VI) has a high level of toxicity. Formaldehyde is potential to be developed as a substitute of chrome tanning agent. The aims of this study are to explain the amount of formaldehyde bound, shrinkage temperature, tensile strength, and tear strength on Mondol stingray (Himantura gerrardi) leather. Pickled mondol stingray has been used as raw material. The study was divided into 4 treatments, that is P.I (formaldehyde 2%), P.II (formaldehyde 4%), P.III (formaldehyde 6%), and P.IV (formaldehyde 8%). The method used is drum tanning. Shrinkage temperatures, tensile strength and tear strength of P.I and P.II are significantly different from P.III and P.IV, but P.I is not significantly different from P.II, whereas P.III is not significantly different from P.IV. P.III is shown to improve the quality of leather stingray more than P.I and P.II, and has fulfilled the requirements of leather stingray according to SNI. 06-6121-1999. It can be concluded that the optimal level of formaldehyde tanning agent that can be used as a chrome tanning agent substitute in tanning Mondol stingray skin is formaldehyde 8% (P.III).

Study of Bismuth Telluride Crystal Strength

2019 ◽  
pp. 1-8
Author(s):  
A. A. Gorbatovskiy
Keyword(s):  
Tensile Strength ◽  
Bismuth Telluride ◽  
Elasticity Modulus ◽  
Testing Machine ◽  
Bend Testing ◽  
Instron Testing Machine ◽  
Measurement Results ◽  
Strength Tests ◽  
Semiconductor Properties

The article presents results of strength tests of bismuth telluride prismatic samples obtained by growing crystals. These crystals have semiconductor properties and are used in the heat machines, the run-ability of which largely depends on the strength of crystals. Data available in the literature are significantly different from each other. It has been shown that, the most consistent strength tests results are obtained in case of bend testing. The measurement results of the elasticity modulus and tensile strength are given. For tests, an INSTRON testing machine with maximum direct stress of the 1000 H was used.

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