SikaRep®-25 HB

Cement based powder

9 months from the date of production.

Store in undamged and unopened original sealed packaging in cool dry conditions. Protect from direct sunlight and frost.

Approx. 1.78 kg/litre if freshly mixed mortar (wet)

Water : Powder = 1:5.45 parts by weight approximately
(i.e. approx. 3.3 litre water per 18 Kg bag)

Minimum 6 mm/ Maximum 50 mm

Approx. 40 minutes

Approx. 83 bags/m³
(Depending on concrete surface and application method)

Pour approx. 3.3 litres clean water into a suitable mixing container and slowly add all the powder while mixing continuously with a mixing paddle attached to a low speed electric drill (max 500 rpm, with power approx. 1000 watt). Thoroughly mix until a smooth, lump free consistency is achieved. A minimum mixing time of 3 minutes is recommended.The water can be adjusted ± 10% to suit the consistency desired.

While bonding coat of SikaRep^® -25 HB is still tacky, pack the mortar well into cavity of repair. Use a placing rather than a rendering technique to fill all voids and ensure thorough compaction is achieved.

Force the SikaRep^® -25 HB against the edge of the repair and progressively work towards the centre.

For repair in excess of 50 mm thick, apply in layers ensuring that each previous layer is sufficiently hardened and well keyed. If previous layers are over 48 hours old, scabble the surface and dampen.

A mix of 1 part of Sika^® Latex to 1 part of fresh Portland cement by weight may be use as a bonding slurry bewteen layers.

Steel trowel the final layer if required to achieve a smooth, tight finish.

As with all cementitiuos based mortar, SikaRep® -25 HB must be protected against direct sunlight and wind while hardening. Cover all exposed mortar with wet hessian, plastic sheeting or use Sika curing compound.

Application and mixing tools should be cleaned with water while material is still fresh. Hardened material can only be removed mechanically.