?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=TENSILE+STRENGTH+OF+THE+NATURAL+RUBBER+COAGULATED+USING+MENGKUDU+(MORINDA+CITRIFOLIA)+AND+ALUMINUM+SULPHATE+&rft.creator=Eko+Alan+Pratama%2C+1115021024&rft.subject=Teknik+mesin+dan+mesin&rft.description=Natural+rubber+is+a+latex+or+isoprene+polymer+(C3H8)+n+obtained+from+rubber+tree+skin+tapping+(Havea+Brasiliensis).+Before+it+is+marketed%2C+latex+was+coagulated+by+acid.+Coagulation+is+the+process+of+clumping+latex+into+solids.+Coagulation+is+divided+into+two+kinds+of+natural+coagulation+and+artificial+coagulation.+In+this+study+used+two+kinds+of+coagulant+substances+namely+mengkudu+and+alum.+Mengkudu+(Morinda+Citrifolia)+is+one+of+the+plants+that+can+bear+fruit+throughout+the+year.+Aluminum+sulphate+compound+(Al2(SO4)3)+or+often+called+alum+is+a+commonly+used+type+of+coagulant.+To+determine+the+influence+of+mengkudu+and+alum+on+the+mechanical+properties+of+rubber+then+do+tensile+testing.%0D%0A%0D%0A+++++++++++++++++Rubber+was+made+into+8+samples+with+additional+variation+of+mengkudu+or+alum+2.44%25%2C+4.76%25%2C+6.98%25+and+9.09%25.+Preparation+of+the+sample+rubber+is+as+follows.+Firstly%2C+latex+was+inserted+into+the+measuring+cup.+Secondly%2C+added+the+variation+of+coagulant+volume+into+the+measuring+cup.+Thirdly%2C+mix+it+for+2+minutes.+Fourthly%2C+pour+the+rubber+sap+that+has+been+mixed+into+the+mold+container.+After+the+rubber+hardens%2C+then++press+the+rubber+using+a+press+machine+for+30+minutes+with+a+loading+of+8+tons.+Finally%2C+heating+the+rubber+for+curing+for+20+minutes+at+150+OC.+The+tensile+test+standard+is+ASTM+D+412.%0D%0A%0D%0A++++++++++++++++++The+results+showed+that+the+fastest+coagulation+time+mengkudu+was+10+minutes+and+alum+was+20+minutes.+The+highest+tensile+strength+of+2%2C44%25+natural+rubber-mengkudu+was+0.51+MPa.+The+lowest+tensile+strength+of+9.09%25++natural+rubber-tawas+was+0.32+MPa.+The+highest+tensile+strain+of+2.44%25++natural+rubber-mengkudu+was+903.89%25.+The+lowest+tensile+strain+of+4.76%25++natural+rubber-mengkudu+was+705.32%25.+%0D%0A%0D%0AKeywords%3A+Natural+Rubber%2C+Mengkudu%2C+Tawas%2C+Tensile+Test%0D%0A&rft.publisher=FAKULTAS+TEKNIK&rft.date=2017-08-23&rft.type=Skripsi&rft.type=NonPeerReviewed&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F28413%2F1%2FABSTRAK.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F28413%2F2%2FSKRIPSI%2520FULL.pdf&rft.format=text&rft.identifier=http%3A%2F%2Fdigilib.unila.ac.id%2F28413%2F3%2FSKRIPSI%2520TANPA%2520BAB%2520PEMBAHASAN.pdf&rft.identifier=++Eko+Alan+Pratama%2C+1115021024++(2017)+TENSILE+STRENGTH+OF+THE+NATURAL+RUBBER+COAGULATED+USING+MENGKUDU+(MORINDA+CITRIFOLIA)+AND+ALUMINUM+SULPHATE.++FAKULTAS+TEKNIK%2C+UNIVERSITAS+LAMPUNG.+++++&rft.relation=http%3A%2F%2Fdigilib.unila.ac.id%2F28413%2F