Magneum Associates

Product Details:
Nitobond EP is a 2 component epoxy bonding agent for bonding fresh wet cementitious materials to existing cementitious surfaces. Nitobond EP is suited to internal and external applications. Nitobond EP may also be used as part of a repair system where a substrate/repair barrier is required or where the substrate is likely to remain permanently damp or wet.

Nitobond EP is based on solvent-free epoxy resins containing pigments and fine fillers. It is supplied as a two-component material in pre-weighed quantities ready for on-site mixing and use. The ‘base’ component is white and the ‘hardener’ component is green, providing visual evidence that adequate mixing has been achieved. (Nitobond EPFS, suitable for cold weather working, can be made available when specifically requested.)

Uses:
For bonding fresh wet cementitious materials to existing cementitious surfaces. For use on horizontal surfaces or on vertical surfaces where mortar or concrete can be supported by formwork. The long ‘open’ life makes it suitable for use with formwork or where additional steel reinforcement has to be fitted. The product is ideal for roads, bridges, pavements, loading bays and factories, and for bonded or granolithic floor toppings. Nitobond EP is equally suited to internal and external applications.

Advantages:
Nitobond EP may also be used as part of a repair system where a substrate/repair barrier is required or where the substrate is likely to remain permanently damp or wet.

• Can be applied on to dry or damp substrates
• Exhibits high mechanical strength
• Positive adhesion - exceeds that of the tensile strength of the host concrete
• Slow cure allows time to erect steel reinforcement and formwork
• Solvent-free - can be used in enclosed locations 

Instructions For Use:
Preparation
Clean all surfaces and remove any dust, unsound material, plaster, oil, paint, grease, corrosion deposits or algae. Roughen the surfaces, remove any laitance and expose the aggregate by light scrabbling or grit-blasting. Oil and grease deposits should be removed by steam cleaning, detergent scrubbing or the use of a proprietary degreaser. The effectiveness of decontamination and soundness of the substrate should then be assessed by a pull-off test.

Mixing
Any steel reinforcement and formwork should be prepared, cut to size and shape, and made ready for assembly before mixing commences. Care should be taken to ensure that Nitobond EP is thoroughly mixed. The ‘hardener’ and ‘base’ components should be stirred separately before mixing to disperse any settlement. The entire contents of the ‘hardener’ tin should then be poured into the ‘base’ tin and the two materials thoroughly mixed using a suitable slow-speed drill and mixing paddle for 2 minutes until a fully uniform colour is obtained. The sides of the tin should then be scraped and mixing should continue for a further 2 minutes.

Application:
Nitobond EP should be applied as soon as the mixing process has been completed. It should be brush or roller applied to the prepared surfaces, being sure to achieve an unbroken coating across the entire substrate. Nitobond EP should be tacky before the new concrete, screed or mortar is placed. The maximum overlay times (see Properties) should also be carefully observed. Failure to apply the new concrete, screed or mortar within the maximum overcoating time will result in Nitobond EP becoming ‘hard’, thus creating a slip plane rather than a bonding action.
If the maximum overlay time is missed, then the Nitobond EP must be mechanically removed and a fresh application made.