Guide to Concrete Mould Release Oils


Concrete Mould Release Agents
Concrete consists of a silicone-calcium complex cement plus a bulk aggregate, the consistency of the slurry during reaction being directly related to the percentage of water in the mix.
In its initial fluid state concrete can be moulded by way of formers into almost geometrical shape, i.e. pipes, paving slabs, lamp-posts, wall sections and ornamental garden features etc. Mould release agents are generally required on the form face to facilitate the subsequent easy removal of the components from the moulds, without damaging the concrete surface or formwork.

Mould Composition
many types of material are used. Metal, plastics, fibreglass or traditional wooden formers are commonly used, often referred to as 'shuttering'. The type of mould material, its shape and porosity characteristics, has a direct bearing on the selection of the mould realease oil used.

Functions of a Mould Release Oil
Application is required on the form face to:-

  • Facilitate the easy removal of the component.
  • Prevent damage to the concrete surface and avoid the creation of pits or blow holes.
  • Prevent damage to mould surfaces.
  • Resist staining of the concrete.
  • Reduce risk of corrosion on the mould or equipment.

Application
Most commonly by brush, swab or spray.
Excessive application should be avoided as this can cause damage to finished components.
If a spray system is used then to avoid contamination from airborne dust the application is done as close to the mould surface as possible.

Product Selection Factors
All types of moulds require a release agent and the selection of the specific type is dependent upon:
  • The material to be cast
  • Size, shape and material of the mould
  • The application method and product volatility
  • Viscosity i.e. low viscosity improves sprayability, high viscosity improves film strength.
  • Odour and colour (staining potential)

Product Types
The following products form the basis of a core product range.
  • Tabor OK - Solvent deposited
  • Terza M-107 - Oil based plus solvent
  • Terza 7060 - Oil based plus solvent
  • Tabor 95 - Oil based
  • Terza 7060 - Oil based plus


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