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GRP lamenting

GRP lamenting

ADVANTAGE OF GRP LAMINATION FOR RCC WATER TANK

  • U.V RESISTANT
  • ALGAE RESISTANT
  • WEATHERPROOF AND WATERPROOF
  • WATER ABSORPTION LESS THAN 0.2%
  • GLASS CONTENT MORE THAN 30%
  • WARRANTY 3 YEARS

Method Of Application for GRP Lamination

  • A prime coat of polyester resin is applied to cover all pores and undulations to form a good binder using a roller. Care is taken to obtain an even surface.
  • Place one layer of E Glass CSM (Chopped Strand Matt) fiber 450gms/ m²density.
  • Apply one coat of polyester resin on the fiber mat and roll properly to expel all entrapped air.
  • Repeat number 2 and 3 until 3 layers of E Glass CSM is placed in position.
  • Roll out and consolidate, so that all entrapped air goes out and that no air pockets or bubbles occur. It is then allowed to dry for 24 hours prior to the application of the final coat.
  • A final coat (white gel coat) with the rate of 600 gms/m². 

MATERIAL DETAILS

  • GELCOAT (FUMED SILLICA, RESIN, TITANIUM, CALCIUM ANDWHITEPIGMENT)
  • FIBER CHOPPED STRAND MAT-(300,450 & 600)
  • UNSATURATED POLYESTER RESIN (GENERAL PURPOSE)
  • HARDNER - CATALYST (MEKP)
  • PUTTY - (RESIN & FUMED SILLICA)
  • ROLLER & BRUSH

GRP LINING SPECIFICATION

  • Rough the surface to remove all waste material and prepare for the adhesion of lamination.
  • All corners are to be curved before applying the GRP.
  • Apply primer resin on the surface.
  • The guarantee provides for any manufacturing defects.
  • Gel coat 0.5mm thickness to provide chemical resistance.
  • Resin content 60-70% by weight to assist reinforcement.
  • E-glass surface mat (450gm/m2) or synthetic fabric 90% resin by weight. The thickness of the reinforced layers is generally 0.5mm. this provides a protective barrier against corrosion.

Manufacturing Procedure

LAY UP

The required amount of resin, catalyst as a hardener and any other ingredients, such as accelerator permitted filler, shall be accurately measured and thoroughly mixed. The record shall be made available to the purchaser or inspecting authority, where applicable.

 

Resin rolling is done if essential, excessive rolling pressure shall be avoided or the mat may disturb the distribution of other reinforcement or it may break the fiber strands.

 

It shall be ensured that good adhesion is obtained between successive layers of the laminate between the shell and added fitting either by appropriate scheduling of the manufacturing operation or by removing the surface of the cured resin to expose.

 

In all types of laminates, adjacent pieces of a laminate including feather-edges reinforcement shall be all joints shall be staggered though the thickness of laminates

and in no case shall joint coincide in adjacent layers.

 

 

When directionally biased reinforcement is used, care shall be taken to ensure that the high-strength fibers are adequately aligned in the correct direction to give the required strength. Any spillage, drips, or runs (which may flake loose) shall be suitably removed.

 

CURING

All items shall be cured in accordance with the resin supplies instructions, wherever possible this shall be done at the manufactures works. Where this is not possible due to size lamination according to the design requirements and resin system used.
 

REPAIRING

Repairing works should be conducted by the same lamination. First, the laminating area is kept dry then make the surface rough with the help of grinder. The joints of the adjacent sides are also cleared and laminated. Overlapping on both sides should not be less than 50mm.