Description

UC 525 is a thixotropic isocyanate and, solvent and VOC free moisture curing sealant, based on Hybrid technology.

It is a filled system that has moisture and oxidation resistance and exhibits good adhesion to cementitious and steel substrates.

Product Application

UC 525 can be used as a general joint sealer and crack filler on cementitious surfaces.

It provides medium chemical, wear and corrosion resistance, while at the same time curing to a 25 Shore A hardness (+/- 5 Shore A).

A degree of colour change with time is to be expected.

It is not recommended for use in water retaining structures.

If applied to natural stone, we recommend the use of UC 105.

UC 525 is overcoatable, however the coating will crack as it will not accommodate the same movement as the sealant.

It is recommended to do a compatibility test prior to application or painting.

Surface Preparation

All surfaces to be clean sound and dry, free of moisture, dust, laitance, and oil. If used in severe or damp conditions prime with UC 106.

Application

Place sausage in the barrel gun, cut end off sausage and fit the nozzle; trim the tip to suit the joint spacing to be filled.

Insert backing rod to the correct depth.

Gun the product into prepared joints and smooth with a dry spatula.

The joint width should be designed to accommodate the expected movement, the joint ratio for 6 – 10mm wide joints is 1:1 thereafter a ratio of 2:1 should be respected.

Note a minimum width of 6mm and a maximum of 20mm should be adhered to. A backing cord/bond breaker should be used depending on application, to prevent three-sided adhesion.

Cleaning

Clean all tools and equipment immediately after use with UC 901, as the cured material is very difficult to remove.

Safety

Contact with the skin should be avoided by wearing gloves, eye protection and protective clothing.

In case of eye contact wash well and obtain medical advice.