metal guard is an innovation by hpcl for lube oil packaging. addressed issues of tampering & built customer confidence, this 7 layer laminate structure with  brand identity on top had induction sealing layer compatible with lube oil. fiber tear marks on  tampering the bungs. better adherence to metal bungs with very less dwell time max 2 seconds. metal cap seal  for extra sealing for closure safety. sealing provided for both bungs 50mm & 20mm. 
