... in control cables is achieved by the use of fine wire copper strands, short lay lengths and by powdering of the ... materials PVC ST-1, ST-2, HR, FRLS, Unarmoured, Armoured round wire, flat stripJacket materials PVC ST-1, ST-2, HR, FRLSDescription ... of PVC called inner sheath armoured with galvanised mild steel wire, strip confirming to IS: 3975, 1979 and finally jacketed with ...