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Government Approvals


Specification for HDPE Cover Blocks has been fixed as follows :
  • Cover Block should made of High Density Polyethylene (HDPE) & Low Density Polyethylene(LDPE)
  • Melting Point of cover Block should be in between 140 to 165 C.
  • Density should be between 0.90 g/cc to 1.10 g/cc.
  • Chloride Content (%) must not be more than 0.100.
  • Ash Content must not be more than 1.5%.
Specification for PVC Cover Blocks has been fixed as follows :
  • Cover Block should be made of Poly Vinyl Chloride.
  • Melting Point of Cover Block should be in Between 140 to 165 C.
  • Chloride Content % by mass must not be more than 0.100.
  • Ash Content % by mass must not be more than 16%.
  • Sulphate Content % by mass must not be more than 0.1%.
As per IS456: 2000 Section 12.3.2 the details for Cover are as follows :
  • Section 12.3.2 Page 26.
  • Tolerance for Cover.
  • Unless specified otherwise, actual concrete cover should not deviate from the required nominal cover +1.0mm.
  • Spacers, cover blocks should be made of concrete of same strength or PVC.
  • Accurate Reinforcement Cover means right protection to the steel Reinforcement and less Maintenance to building.
Quality Control :
  • Dimensional Check on Sampling Basis with help of Vernere Caliper(In Works):1 in 100.
  • Visual Inspection (In Works): on every 1 in 50 sampling basis.
  • Compressive Load Test (Lab Test): On every Lot basis.
  • Melting Point (Deg C) (Lab Test): On every lot basis.
  • Density (g/cc) (Lab Test): On every Lot basis.
  • Acid Resistance: On every Lot basis.


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