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Estocell RBCF

Resin Bonded Cork Filler

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Estocell RBCF is a range of resin bonded cork expansion joint fillers recommended for used in immersed conditions.

Estocell RBCF is manufactured from granulated cork bound together with a synthetic resin. It does not contain bitumen or tar and cannot impair the adhesion of any joint sealing compound by contaminating the joint faces.


Estocell RBCF are a range of resin bonded cork expansion joint fillers recommended for use in immersed conditions and as expansion joint fillers for joints in:

  • Water retaining structures
  • Water excluding structures
  • Water treatment plants /reservoirs
  • Building basement structure and subways
  • Concrete retaining walls


  • Simple and easy to handle and install
  • Will not extrude under compression
  • Resilient
  • Low load transfer across an expansion joint

Standards Compliance

  • UK Department of Environment Specification No 201, Clause 606
  • ASTM D 1752-67(R73) Type II
  • American National Standard A37. 114-1969 (R 75) Type II

Specification Clauses

The expansion joint filler as detailed shall be Estocell RBCF supplied by Estop and installed strictly in accordance with the manufacturer’s written instruction.

Design Criteria

Example of a sealed expansion joint in floor of a Reservoir

  • Estojoint / Estoliastic
  • Bond breaking tape
  • Estocell RBCF
  • Recessed seal

Estocell RBCF Design Criteria

  • Estojoint / Estoliastic
  • Bond breaking tape
  • Estopper Rearguard E250
  • Lean concrete
  • Waterproofing membrane
  • Estocell RBCF

Physical Properties

Form Compressible sheet
Solid Content, % 100
Recovery After Compression Test, % > 96
Compression, N/mm²
(Load required to compress a dry sample to 50% of its original thickness)
Density, kg/m³ 210
Weathering test No disintegration.

Joint Sealing

Estocell RBCF may be cut back using the cutters to form the sealing slot

In addition to a surface seal, all immersed joints in water retaining structures should contain Estopper waterstops.

Installation Instructions

Estocell RBCF is supplied in piece form. They may be sawn or cut to required sizes. They are used to form and fill expansion joints.

In Concrete

Estocell RBCF should be fixed, using an approved contact adhesive, spreading grade, to the face of the first placed concrete, follow by casting the second poured concrete.

Sealing slot can be formed by placing on top of the Estocell RBCF a strip of soft wood or other former, which can be removed later.

In Block Work

Estocell RBCF shall be installed whilst laying block work and shall be so placed that a sealant slot is formed. Ensure that the sealant slot formed is free from mortar droppings.

Packing & size

Estocell RBCF
12.5mm thick 610mm x 910mm sheet
20.0mm thick 610mm x 910mm sheet
25.0mm thick 610mm x 910mm sheet

Technical Support

Estop offers a technical support package to specifiers, end-users and contractors, as well as on site technical assistance.


Store in dry, covered condition.


There are no known health hazards associates with Estocell RBCF in normal use.

Additional Information

Estop manufactures and offers a wide range of complementary products, which includes waterstops, waterproofing products, grouts, anchors, specialized flooring products. In addition, a wide range of products formulated for repair and refurbishment of spalled concrete are available.