These sleeves are approved by LCSO Ministry of Defence as per JSS 54802:Sleeving shall be manufactured from PTFE tape spiral wrapped and fused process.PTFE Electrical Sleeving meets the performance requirements of JSS 54802BS 2848 Type 6 specification.Operating Temperature form -65C to +250CResistant to attack by lubricants, Hydraulic, Aircraft or Rocket fuel, atmospheric conditions and virtually all chemicals.