Rubber formwork liners are designed to be positioned within the supporting formwork / falsework system to create features and patterns within the surface of the concrete.
Each formwork liner is designed to meet the specific requirements of the project including the size, shape, finish and number of re-uses. Using this information, our designers will select the most appropriate material type for each liner and create a 3D CAD model for approval, which when accepted will allow CNC machining of the finished formwork solution.
*Please refer to National Structural Concrete Specification (NSCS) Edition 4 guidance available below.
Used for the formation of surface features and patterns within cast in-situ, reinforced concrete structures.
When developing a formwork liner design, the following factors should be considered in addition to reviewing any CAD drawings, 3D models, specifications etc that are available:
Once the project requirements have been confirmed, a conceptual design can be completed along with provision of a quotation confirming proposed material type, features, quantities, manufacturing lead time and costs.
Typically, Cordek formwork liners are manufactured using a castable liquid rubber compound available in a range of shore hardness’s. Technical data sheets for the material are available upon request.
One of the factors determining the most appropriate material used to manufacture a formwork liner is the required concrete finish. Further information in relation to the classification of concrete finishes can be found within the National Structural Concrete Specification (NSCS) Edition 4 guidance, a copy of which can be downloaded from the Certification, Guidance and Approval section below.
Once approved, the agreed 3D CAD Model will be converted in to CAM data allowing accurate manufacture of the mould(s) from which the formwork liner will be cast. Typically, 5-axis CNC routing techniques are employed to create the mould, from a suitable substrate such as modelboard, to ensure a dimensionally tolerant finish is achieved.
Upon completion of the mould, a castable liquid rubber compound is poured within it to the required depth and left to cure for the appropriate period prior to demoulding.