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Penelitian penerapan sol karet sepatu kanvas untuk olah raga pada industri ditinjau dari sifat ketahanan kikis dan kekerasannya Any Setyaningsih; Arum Yuniari; Sri Brataningsih Puji Lestari
Majalah Kulit, Karet, dan Plastik Vol 12, No 25 (1998): Majalah Barang Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Appied research rubber sole for canvas shoes sport of industry have observed of properties abrasion resistance and hardness with perform research on the process to shape sole in industry with variation time of 4, 5, 6, 7, 8 minutes and pressure of 145, 150, 155 kg/cm2 on temperature 150’C on the result 15 variation soles, until of result properties abrasion resistance = 0.1410 mm3/kgm and hardness = 70 shore A to shape with variation pressure 150 kg/cm2, time 6 minute and temperature 150’C ti fill means SNI 0171-1987 A : Canvas Shoes with Rubber Sole for Sport. INTISARI Penelitian penerapan sol karet sepatu kanvas untuk olah raga pada industry ditinjau dari sifat ketahanan kikis dan kekerasan dilakukan penelitian dengan proses pencetakan sol di industry dengan variasi waktu pencetakan sol 4, 5, 6, 7, 8 menit dan tekanan 145, 150, 155 kg/cm pada suhu 150’C diperoleh 15 variasi sol cetak, sehingga dari hasil penelitian diperoleh sifat ketahanan kikis = 0.1410 mm3/kgm dan kekerasan = 70 shore A dicetak dengan variasi tekanan 150 kg/cm, waktu 6 menit dan suhu 150’C memenuhi persyaratan SNI 0171-1987 A : Sepatu Kanvas dengan Sol Karet untuk Olah Raga.

Pemanfaatan minyak kulit biji mete sebagai plasticizer dalam pembuatan sol sepatu Herminiwati Herminiwati; Dwi Wahini Nurhajati; Sri Brataningsih Puji Lestari
Majalah Kulit, Karet, dan Plastik Vol 20, No 1 (2004): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

The objective of the research was to study cashew nut shell liquid (CNSL) utilized as rubber plasticizer in shoe soles preparation. CNSL found from pressed cashew nut shells. CNSL consists of anacardict acid (90%) and cardol (10%). To remove the poison ivy, CNSL was treated by heating them at temperature 1200C for two hours. Sulfuric acid was also added to remove the impurities such as nitrogenous, sulphur and inorganic matters. Compounding process was carried out on two roll mill. Shoe sole compounds were prepared in various level of CNSL and Minarex B oil either separated formulation or in combination. Vulcanized rubber was then tested based on SNI 12-0172-1987 : Canvas shoes for general. The result of the research showed that CNSL can be utilized as rubber plasticizer in the shoe soles preparation. Compound with 5 phr CNSL provided good physical properties and conformed the requirements of SNI 12-0172-1987, such as tensile strength 136,4 kg/cm2, elongation at break 198,3%, tear resistance 63,56 kg/cm2, hardness 62,3 shore A, density 1,13 g/cm3, Grasselli abrasion resistance 0,711 mm3/ kgm, permanent set 6,40% and no crack detected on the flex cracking test. The research showed also that compound with the addition of 5 phr Minarex B oil into the compound, the CNSL provided better physical properties. Keywords : cashew nut shell liquid, plasticizer, shoe soles. Penelitian ini bertujuan untuk memanfaatkan minyak kulit biji mete (Cashew nut shell liquid) sebagai plasticizer karet dalam pembuatan sol sepatu. Minyak kulit biji mete (CNSL) diperoleh dari pengepresan kulit biji mete glondong. CNSL tersusun dari 90% asam anakardat dan 10% kardol. Untuk menghilangkan gatal dan toksisnya CNSL di –treatmen dengan pemanasan pada suhu 1200C selama 2 jam. Asam sulfat ditambahkan untuk menghilangkan pengotor seperti senyawa-senyawa nitrogen, sulfur dan bahan onorganik. Pembuatan kompon dilakukan dengan mesin two roll mill. Kompon sol sepatu dibuat dengan berbagi kadar CNSL maupun minyak Minerex B baik secara sendiri atau kombinasi. Vulkanisat karet diuji berdasar SNI 12-0172-1987 : Sepatu kanvas untuk umum. Hasil penelitian menunjukkan bahwa CNSL dapat dimanfaatkan sebagai plasticizer untuk pembuatan sol sepatu. Kompon dengan kadar CNSL sebesar 5 phr memberikan sifat fisis yang baik dan memenuhi syarat SNI 12-0172-1987, dengan sifat-sifat sebagai berikut : tegangan putus 136,4 kg/cm3, perpanjangan putus 198,3%, ketahanan sobek 63,56 kg/cm2, kekerasan 62,3 shore A, bobot jenis 1,13 g/cm3, ketahanan kikis Grasselli 0,711 mm3/kgm, perpanjangan tetap 6,40 % dan tidak retak pada uji ketahanan retak lentur. Penelitian juga menunjukkan bahwa dibandingkan dengan penambahan minyak Minarex B sebesar 5 phr, maka CNSL memberikan sifat fisis lebih baik. Kata Kunci : minyak kulit biji mete, plasticizer, sol sepatu.

Rancang bangun perekayasaan industri pipa pvc untuk saluran air minum Irene Sri Sukaeni; Arum Yuniari; Sri Brataningsih Puji Lestari
Majalah Kulit, Karet, dan Plastik Vol 12, No 23 (1997): Majalah Barang Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

The aim this research is to find out process of production and the relation between cost, sell price and percentage of break even point. Production of capacity produced is 345.600 pipes. The economical calculation are as follows: the total capital is fixed capital + working capital = Rp. 1.396.140.000,00; the total production cost is variable cost a year + fixed cost a year = Rp. 1.620.710.000,00. The manufacturing cost = Rp. 4.690.00/pipe, the profit calculation before taxing is Rp. 383.770.000.00 after taxing is Rp. 307.020.000,00 the pay out period calculation consist of the percentage of profit to return the capital (rate of return) before taxing is 27,49%, after taxing is 22,00% and the pay period before taxing 3 year, after taxing 3 year 7 month. The break even point is 51,44% and the capacity of break even point is 177.777 pipes. INTISARI Penelitian ini bertujuan untuk mengetahui proses produksi dan hubungan antara biaya, harga jual, dan persentase batas rugi laba. Kapasitas produksi direncanakan sebesar 1200 pipa per hari, sehingga dalam 1 tahun dengan 288 hari kerja kapasitas yang dihasilkan 345.600 pipa. Dari analisa ekonomi diperoleh hasil sebagai berikut : Total modal yang terdiri dari modal tetap dan modal kerja = Rp. 1.396.140.000,00 biaya produksi yang terdiri dari biaya tidak tidak tetap 1 tahun dan biaya tetap 1 tahun = Rp 1.620.710.000,00. Harga pokok produksi = Rp 4.690,00/buah pipa, keuntungan sebelum pajak Rp 383.770.000,00 dan sesudah pajak Rp. 307.020.000,00/. Persen keuntungan untuk mengembalikan modal sebelum pajak = 27,49% dan sesudah pajak = 22,00%. Waktu pengembalian modal sebelum pajak = 3 tahun, sesudah pajak 3 tahun 7 bulan. Perhitungan nilai batas rugi laba = Rp 1.031.110.000,00 dan persentase batas rugi laba = 51,44% serta kapasitas batas rugi laba = 177.777 buah pipa.

Pengaruh penambahan bahan pengisi alumunium silikat dan bahan pengembang azodicarbonamide dalam pembuatan karet mikroseluler untuk sol ringan Herminiwati Herminiwati; Sri Brataningsih Puji Lestari
Majalah Kulit, Karet, dan Plastik Vol 25, No 1 (2009): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20543/mkkp.v25i1.230

The aim of the research was to investigate the effect of the added aluminium silicate filler and Azodicarbonamide (AZDM) blowing agent on production of microcellular rubber for light sales. The formula of microcellular rubber consist of ethylene vinyl acetate (EVA) 80 phr, natural rubber (SIR 3 L) 20 phr, stearic acid 0,5 phr, zink oxide 1 phr, aluminium silicate 15 phr, AZDM 1,5 phr and dicumyl peroxide 0,8 phr. The best formula phr and AZDM blowing agent of 1,5, 2 and 2,5 phr, respectively. The vulcanization process was carried out at 160 – 165o C for 20 minutes and molding on 100 kg/cm2 pressure. The results showed that the best microcelluler rubber was produced by using the formula of aluminium silicate filler of 20 phr and AZDM blowing agent of 1,5 phr. The microcelluler rubber performed physical properties such as tensile strength 42,75 kg/cm2, elongation at break 204%, Grasselli abrasion resistance 2,79 mm3/kg.m, hardness 50,6 shore A, compression set 33,12% and specific gravity 0,34 g/cm3, while signs of cracking was not performed. Key words: microcelluler rubber, light soles, filler ABSTRAKTujuan penelitian adalah untuk mempelajari pengaruh penambahan alumunium silikat sebagai bahan pengisi dan Azodicarbonamide (AZDM) sebagai bahan pengembang pada pembuatan karet mikroseluler untuk sol ringan. Formula karet mikroseluler terdiri atas Etilen Vynil Asetat (EVA) 80 phr, karet alam (SIR 3 L) 20 phr, asam stearat 0,5 phr, zink oksida 1 phr, bahan pengisi alumunium silikat 15 phr, AZDM 1,5 phr dan dicumyl peroksida 0,8 phr. Formula karet mikroseluler terbaik diteliti dengan variasi penambahan aluminium silikat berturut-turut 10,15 dan 20 phr dan AZDM berturut-turut 1,5, 2 dan 2,5 phr. Vulkanisasi karet mikroseluler dilakukan pada suhu 160 – 165oC selama 20 menit dengan cara cetak tekan pada tekanan 100 kg/cm2. Hasil penelitian menunjukkan bahwa karet mikroseluler terbaik dibuat dengan formula penggunaan aluminium silikat sebesar 20 phr dan AZDM 1,5 phr. Karet mikroseluler yang dihasilkan memiliki kuat tarik 42,75 kg/cm3, perpanjangan putus 204 %, ketahanan kikis Grasselli 2,79 mm3/kg.m, kekerasan 50,6 shore A, pampat tetap 33,12% dan bobot jenis 0,34 g/cm3, serta tidak timbul keretakan.

Arang aktif sekam padi sebagai bahan pengisi kompon sol karet Arum Yuniari; Sri Brataningsih Puji Lestari
Majalah Kulit, Karet, dan Plastik Vol 19, No 1 (2003): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

The aim of this research was to investigate the properties of activated carbon from rice husk filler in their application on vulcanized rubber soles, and to determine its suitability for rubber compound, the properties of activated carbon from rice husk filler in their application on vulcanized rubber soles, and to determine its suitability for rubber compound, the properties of activated carbon made from rice husk was investigated by comparing with cabon black N 330. Activated carbon made from rice husk was made by carbonization process at temperature of 4500C for 1 hour and activation process with NaCL 4% for 24 hours followed by pyrolysis at temperature 5000C for 1 hour. Filler was milled and sieved by 400 mesh siefter. The research showed that using activated carbon in the amount 20 phr and carbon black N330 40 phr. Fulfill the requirement at SNI : 12-0172-1987 : Canvas shoes sole for general purpose, where as tensile strength 11,24 N/mm2, elongation at break : 699%, tear strength 2,97 N/mm2, hardness : 65,7 shore A, density 1,23 gram/cm2, permanent set 0,10%, abrasion 0,72 mm3/ kgm and flexing at 250 kcs no crack. Keywords : rice husk, rubber, filler

Pembuatan kompon cincin karet perapat air minum Sri Brataningsih Puji Lestari
Majalah Kulit, Karet, dan Plastik Vol 23, No 1 (2007): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20543/mkkp.v23i1.337

The objective of this research was to investigate the effect of ration of natural rubber, synthetic rubber RSS/SBR and carbon black in preparation of compound for Rubber Seal Joint Rings for Water Supply. The ratio of RSS/SBR was 35/63; 25/75; 15/85 phr and Carbon black 20 phr; 30 phr and 40 phr. The vulcanized product of Rubber Seal Joint Rings for Water Supply were then tested their physical properties. Generally the test result were better than those of for Rubber Seal joint rings for Water Supply found in market and they fulfill the requirements of SNI 06-4828-1998 “Spesifikasi cincin karet sambungan air minum, air limbah dan air hujan”. The hardness of product using carbon black in constant quantity and varied quantity of RSS/SBR did not perform significant effect either for pre-ageing. The best hardness of 61 shore A and 65 shore A with 0% change was achieved at the quantity of carbon black 30 phr and 40 phr with ratio RSS/SBR 25/75. The optimum tensile strength of 11.38 MPa and 12.63 MPa with change after ageing of -6.3% and -11.3% was achieved at the quantity of carbon black 20 phr and 30 phr with ratio of RSS/SBR 25/75. The best of elongation at break of 440%with change after ageing 1.35% was achieved at the use of carbon black 20 phr with ratio of RSS/SBR 25/75, where as with ratio RSS/SBR 35/65 and carbon black 30 phr, the elongation at break was 453% and chane after ageing was -1.45%. The best compression set of 5.39% and 5.68% was achieved at the quantity of carbon black 30 phr and 40 phr with ratio RSS/SBR 15/85. The optimum swelling of 2.35% was achieved at the quatity of carbon black and ratio RSS/SBR 25/75 was selected representing the exact composition of vulcanized compound of for Rubber Seal joint rings for Water Supply and perfoming best physical properties fulfilling the quality requirement of SNI 06-4828-1998 “Spesifikasi cincin karet sambungan air minum, air limbah dan air hujan”. Key word : Rubber Seal, joint rings, water supply ABSTRAK Penelitian ini bertujuan untuk mempelajari jumlah penggunaan campuran karet RSS/SBR dan Carbon Black pada pembuatan kompon cincin karet perapat air minum. Rasio RSS/SBR adalah (35/65, 25/75, 15/85) phr dengan carbon black 20 phr, 30 phr dan 40 phr. Vulkanisat karet perapat air bersih yang dihasilkan kemudian diuji sifat fisisnya. Secara keseluruhan hasil uji vulkanisat karet perapat air minum hasil penelitian memenuhi SNI 06-4828-1998 dan mempunyai sifat fisik lebih baik dibandingkan sifat fisik sampel dari pasaran. Sifat kekerasan pada penggunaan carbon black yang tetap RSS/SBR yang bervariasi tidak memberikan pengaruh yang berarti, baik sebelum aging dan perubahan setelah aging. Kekerasan yang terbaik dicapai pada jumlah carbon black 30 dan 40 phr dengan rasion RSS/SBR 25/75 yaitu 61 shore A dan 65 shore A serta perubahan 0%. Nilai kuat tarik optimal dicapai pada penggunaan carbon black 20 phr dengan rasio RSS/SBR 22/75 yaitu sebesar 11,38 Mpa dan 12,63 Mpa dengan perubahan sesudah aging -6,31% dan -11,3%. Hasil perpanjangan putus terbaik dicapai pada penggunaan carbon black 20 ogr dengan rasio RSS/SBR 25/75 yaitu 440% dengan perubahan sesudah aging -1,35% serta rasio RSS/SBR 35/65 dengan jumlah carbon black 30 phr sebesar 453% dengan perubahan sudah aging -1,45% . Nilai pampat tetap terbaik dicapai pada penggunaan carbon black 30 phr dan 40 phr serta rasio RSS/SBR 15/85 yaitu 5,39% dan 5,68%. Pembengkahan optimal dicapai pada penggunaan carbo black 40 phr dan rasio RSS/SBR 15/85 yaitu 2,35%. Dari beberapa hasil uji fisik vulkanisat yang menunjukkan nilai terbaik tersebut dipilih karet perapat air minum dengan kompoisisi carbon black 30 phr dari rasio RSS/SBR 25/75 sebagai komposisi yang tepat yang dapat memberikan sifat fisik terbaik dan memenuhi syarat mutu SNI 06/4828-1998 “Spesifikasi cincin karet sambungan air minum, air limbah dan air hujan”. Kata kunci: Seal karet, cincin perapat, air minum.

Penelitian pengaruh variasi China clay dan napthenoc oil terhadap kekerasan dan ketahanan sobek kompon karet untuk lis pintu almari es Sri Brataningsih Puji Lestari; Luciawati Sunaryo
Majalah Kulit, Karet, dan Plastik Vol 10, No 20 (1995): Majalah Barang Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

The aim of this research is to know influence of naphthenic oil and filler china clay to the physical properties of hardness and tear resistant rubber compound for refrigerator gasket. It makes from natural rubber (pale crepe) and synthetic rubber (SBR 1502) as material with addition ingredients are china clay, stearic, guanidine, naphthenic oil, paraffin wax, coumarone resin, zink okside, stearic acid, guanidine, sulfonamide, ASOP, titan diokside, brown factice and sulphur. Rubber compound for refrigerator gasket, formed to slab by hydraulic press at 150C and 150 kg/cm2. Than tasted hardness and tear resistant. The result of this research indicated naphthenic oil and filler china clay variation are high significant to hardness and tear resistant properties of rubber compound for refrigerator gasket. INTISARI Penelitian ini bertujuan untuk mengetahui pengaruh variasi naphthenic oil bahan pengisi china clay terhadap sifat fisis kekerasan dan ketahanan sobek kompon karet untuk lis pintu almari es. Kompon karet untuk pintu almari es dibuat dari bahan baku karet alam ( pale crepe ) dan karet sintetis (SBR 1502) ditambah dengan ingredient- ingredient antara lain filler china clay, calcium carbonat, naphthenic oil, paraffin wax, coumarone resin, zink okside, asam stearate, guanidine, sulfonamide, ASOP, titan diokside, brown factice dan sulfur. Kompon karet lis pintu almari es dibuat menjadi bentuk slab dengan alat hydraulic press pada suhu 150C dan tekanan 150 kg/cm2. Kompon yang didapat diuji sifat fisi kekerasan dan ketahanan sobeknya. Hasil penelitian menunjukkan bahwa variasi naphthenic dan bahan pengisi china clay berpengaruh nyata terhadap sifat kekrasan dan ketahanan sobek kompon karet untuk lis pintu almari es.

Pengaruh sulfur terhadap sifat fisika campuran pale crepe dan SBR untuk karet tahan panas Arum Yuniari; Nursamsi Sarengat; Sri Brataningsih Puji Lestari
Majalah Kulit, Karet, dan Plastik Vol 29, No 2 (2013): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20543/mkkp.v29i2.181

ABSTRACTSulfur plays an important role in the rubber vulcanization process especially in the formation of crosslinks. Heat resistant rubber made from mixing pale crepe and SBR requires the right amount of sulfur as crosslinking agent. The purpose of the study was to determine the effect of the addition of sulfur on the changes in physical properties before and after aging. Heat resistant rubber was made with variation of pale crepe/SBR: 80/20; 70/30; 60/40; 50/50 phr and sulfur variation of 1; 1.5 phr. The results showed that sulfur was influential in the crosslinks formation. The addition of 1 phr sulfur gave higher physical properties of the vulcanized with 1.5 phr sulfur. The changes of physical properties after aging process of the vulcanized with sulfur 1 phr was lower than the vulcanized with sulfur 1.5 phr. Vulcanized pale crepe/SBR (70/30) with 1 phr sulfur could be applied as heat-resistant rubber products. Keywords: Pale crepe/SBR blends, sulfur, physical properties, heat resistant rubber ABSTRAKSulfur memegang peranan penting dalam proses vulkanisasi karet terutama dalam hal pembentukan ikatan silang. Karet tahan panas yang dibuat dari pencampuran pale crepe dan SBR membutuhkan sulfur dalam jumlah yang tepat sebagai crosslinking agent. Tujuan dari penelitian adalah untuk mengetahui pengaruh penambahan sulfur terhadap perubahan sifat fisika sebelum dan sesudah aging. Karet tahan panas dibuat dengan variasi pale crepe/SBR: 80/20; 70/30; 60/40; 50/50 phr dan variasi sulfur 1 dan 1,5 phr. Hasil penelitian menunjukkan bahwa sulfur sangat berpengaruh terhadap pembentukan ikatan silang. Penambahan sulfur 1 phr memberikan sifat fisika lebih tinggi dari pada vulkanisat dengan sulfur 1,5 phr. Perubahan sifat fisika sesudah aging untuk vulkanisat dengan sulfur 1 phr lebih kecil dari vulkanisat dengan sulfur 1,5 phr. Vulkanisat pale crepe/SBR (70/30) dengan sulfur 1 phr dapat digunakan untuk produk karet tahan panas. Kata kunci: Pale crepe/SBR blends, sulfur, sifat fisika, karet tahan panas.

Komposit dari sampah plastik fleksibel dan serbuk gergaji Dwi Wahini Nurhajati; Arum Yuniari; Herminiwati Herminiwati; Sri Brataningsih Puji Lestari
Majalah Kulit, Karet, dan Plastik Vol 19, No 1 (2003): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

A composite made from the flexsible plastic waste and saw dust was studied. The objectives of this research was to find the optimum ratio of the flexible plastic waste and saw dust in its application on a floor tile. The investigated ratio of flexible plastic waste / saw dust were 100/0; 90/10; 80/20; 70/30; 60/40; and 50/50 respectively. The composites were prepared on a rheocord-90 machine at 600C for 10 minutes. The composites were tested for their physical properties I, e flexibility, dimensional stability, curling, volatility, tensile strength, elongation at break, and hardness. The physical properties testing result show that a composite by using the flexible plastic waste and saw dust in comparation of 90/10 could meet the requirements of SNI 03/4060/1996 for Vinyl Floor. The increasing saw dust content in composites decreased tensile strength, elongation at break, flexibility, and hardness, but increased dimensional stability, and volatility. Tensile strength of all composites was higher than particle board. Keywords : composites, flexible plastic waste, saw dust, floor tile.

Pemanfaatan zeolit sebagai bahan pengisi dalam pembuatan karet sponge untuk tatakan sepatu Herminiwati Herminiwati; Murwati Murwati; Sri Brataningsih Puji Lestari
Majalah Kulit, Karet, dan Plastik Vol 23, No 1 (2007): Majalah Kulit, Karet, dan Plastik
Publisher : Center for Leather, Rubber, and Plastic Ministry of Industry, Indonesia

The purpose of this research was to study the effect of zeolite as filler in the preparation of sponge rubber for shoe insocks. During wearing period of shoes, unpleasant odor often smell for the result of sweat accumulation and their decomposition by microorganism. Besides as rubber filler, zeolit has odor adsorption function. The formula of rbber sponge could be as the following : crepe rubber 100 phr, paraffinic oil 20 phr, ZnO 10 phr, stearic acid 5 phr, MBTS 1 phr, TMTD 0.25 phr, anti-oxidant 1 phr and sulphur 2 phr. To obtain the best sponge rubber formula, some experiment was done by formulating variation of zeolite and blowing agent AZDM in the amount of 25, 50, 75 phr and 5, 10, 15 phr respectively. The vulcanization process was carried-out at temperature 140oC for minutes by compression moulding. The research showed that the best formula with high odor absorption was consist of zeolite 50 phr and blowing agent AZDM 5 phr. The sponge rubber had odor adsorption 93,47%, and the physical properties were as follow: tensile strength 2.018 N/mm2, elongation at break 251%, tear strength 1.029 N/mm2, density 0.717 g/cm3, and compression set 36.38%. Odor absorption was tested by using gas chromatography. Key words : zeolite,filler, sponge, rubber, shoe insocks. ABSTRAKPenelitian ini bertujuan untuk mempelajari pengaruh penggunana zeolit sebagai bahan pengisi dalam pembuatan karet sponge untuk tatakan sepatu. Pada pemakaian sepatu seringkali timbul bau tak sedap karena akumulasi keringat dan perurainnya oleh mikroorganisme. Zeolit selain sebagai bahan pengisi karet juga berfungsi sebagai peneyrap bau. Formula karet sponge terdiri atas karet krep 100 phr, minyak parafinik 20 phr, ZnO 10 phr, asam stearat 5 phr, MBTS 1 phr, TMTD 0,25 phr, anti oksidan 1 phr, belerang 2 phr. Untuk mendapatkan formula karet sponge terbaik maka peneltiian dilakukan dengan variasi bahan pengisi zeolit sebesar 25,50, 75 phr dan bahan pengembang AZDM sebesar 5, 10, 15 phr. Vulkanisasi dilakukan pada suhu 140 oC selama 10 menit dengan proses cetak tekan. Hasil penelitian menunjukkan bahwa formula terbaik dengan daya serap bau tinggi terdiri atas zeolit 50 phr dan bahan pengembang 5 phr. Karet sponge mempunyai daya serap bau 93,47% dan sifat fisis sebagai berikut: tegangan putus 2,018 N/mm2, perpanjangan putus 521%, ketahanan sobek 1,029 N/mm2, bobot jenis 0,717 g/cm3, pampat tetap 36,38%. Daya serap bau diuji menggunakan gas kromatografi. Kata kunci : zeolit, bahan pngisi, karet sponge, tatakan sepatu

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