High Industry Approval. Since its launch in early 2005, CemNet e-Learning has been used by thousands of students worldwide. Such personel training has been taken up by multinationals including Lafarge, Holcim, Cemex and HeidelbergCement through to major companies such as Titan, Buzzi Unicem, Siam Cement, Yanbu Cement, Egyptian Cement, Vassilliko, JK.