00386nam a2200121Ia 4500008004100000100002300041245006400064260006500128300001000193650001900203650002100222700002100243220216s9999    xx            000 0 und d  aTillekeratne L M K 0aNatural rubber: A more safer material than synthetic rubber  bBulletin of the Rubber Research Institute of Sri Lankac1997  a6-Jan  aNatural rubber  aSynthetic rubber  ade Silva Karnika