Application of reactive resin products

Safety first

Reactive resins are usually subject to labelling and therefore make special demands on work safety. For the processing of epoxy resins, the national Employer's Liability Insurance Associations stipulates that protective goggles, long-sleeved clothing and special gloves must be worn, and that neither eating nor smoking should be allowed during processing.

Proper storage

Reactive resins should be stored in a temperature range of > +15 °C to +25 °C. Cold resin components behave like honey and can only be mixed with great difficulty or insufficiently. Inversely, if the components are stored in a very warm environment (inside a vehicle in the sun), an immediate reaction occurs during mixing. The processing time is thus extremely shortened.

Required documents

In addition to the technical data sheet, the EN safety data sheets are available for all Weber products. They can be downloaded from our website. Printed copies of these documents should be available on the construction site.

Mixing

1. Two-component reactive resins are supplied in 2 pre-mix twin packagings (component A = resin base and component B = hardener). The mixing ratio A : B is indicated in parts by weight on the label. Withdraw partial quantities only by exact weighing.

2. A ready-to-use material is obtained by intensive mechanical mixing of both components. In the case of coloured and filled (i.e. blended with silica sand) reactive resins, the corresponding component (usually A-component) must be intensively stirred in advance.

3. When decanting the compound into an empty mixing vessel after mixing and when mixing again for one more minute, the mixing will be improved. When using partial quantities, the mixing ratio given on the container label must be observed. Immediately after mixing, the product must be applied.

4. Attention must be paid to the bottom and walls of the packaging during mixing. This will prevent any inaccurate dosage. After mixing, no colour difference should be visible in the mixture.

5. If fillers (silica sands) are added to the reaction resin, allow them to come to room temperature of at least +15 °C. Especially with premixed grading curves, whole bags should be used because of possible transport segregation.

6. The freshly mixed binder is added to the aggregates (fillers) with a running compulsory mixer until a lump-free consistency is obtained.

Application

1. Reactive resins generate heat during the setting process. This can cause the mixed material in the mixing vessel to heat up very quickly. Therefore, the reaction resin should be poured out quickly after mixing and distributed (as coating) with the rake weber Großflächenrakel + triangular notched blade weber Zahnleiste or a rubber squeegee (as primer).

2. Then the primer is smoothed down uniformly with a shorthair lambskin roller. Accumulations of material are to be avoided. The still fresh primer is evenly sprinkled with approx. 1.5 - 2.5 kg/m² of the oven-dried silica sand weber.sys Hartquartzmaterial (0.7 - 1.2 mm).

3. Levelling (self-spreading) coatings are applied with the rake weber Großflächenrakel + notched blade weber Zahnleiste no. 1 (notch 2.5 mm) in the intended layer thickness and de-aerated with a spike roller in crosswise motions for approx. 5 - 10 minutes. On inclined or vertical surfaces, the mixture can be adjusted to a non-sag consistency by adding a thixotropic agent (weber.floor 4917) and applied with a trowel.

4. Anti-slip surfaces are obtained by scattering quartz sand onto the still fresh coating. Sand should be added until no more binder rises. As suitable sands use medium and coarse grain sizes (e.g 0.7 - 1.2 mm). Fine sands (e.g 0.1 - 0.4 mm) are not suitable because of the risk of clod formation.

5. As a rule, the excess quartz sand that is not firmly bonded is removed the next day. A light intermediate mechanical sanding removes grain peaks and gives a more even surface. The surface should then be well vacuumed.

6. For improving the cleanability, apply a top sealer, for ex. the epoxy resin coating weber.tec 796. For this purpose, the material (unfilled - without silica sand) is poured onto the floor, spread with a rubber squeegee with a soft lip and finished with a shorthair lambskin roller for providing a thin layer.  

Application on inclined surfaces

1. When working on inclined or vertical surfaces, the otherwise highly flowable reactive resin coatings can be adjusted to a trowel-grade consistency by adding a thixotropic agent (weber.floor 4917). Depending on the desired consistency and application, mix the pre-said product at a rate of 2% and 8 % by weight into the already mixed binder.

2. The thixotropic adjusted material can now be applied in thin layers with a roller or in thick layers with a flat trowel. In case of multiple roller application, it is recommended to make the intermediate layers non-skid by scattering quartz sand (0.1 - 0.5 mm) so that the roller does not slip during application. This also increases the adhesion of the intermediate coat and ensures a uniform application thickness.

Connection floor – wall

3. The transition from the horizontal to the vertical surface is formed by installing a triangular wedge or a bottle-form groove made of epoxy resin mortar. The leg length should be 30 - 50 mm. The mixing ratio of the epoxy resin mortar is 1 : 7 parts by weight of the epoxy resin primer weber.tec 794 and silica sand in the appropriate grading curve.