Epoxy Crack Repair 7146- 1.5kg
• Even on wet substrates
• High penetration and adhesion
WILLPOX® 7146 is a solvent-free and low-viscosity 2-component reaction plastic based on epoxy resin.
Application: Generally for filling and force-locking grouting of cracks in cement-bound substrates.
WILLPOX® 7146 has very low viscosity and therefore penetrates well into the finest pores and capillaries, even at lower temperatures.
WILLPOX® 7146 can also be used on damp substrates and wet masonry.
WILLPOX® 7146 volume shrinkage and therefore properly ensures permanent bonding of crack flanks.
Colour: transparent, slightly yellowish
Mixing ratio (weight): 2 : 1
Density at 23°C: 1.00 g/cm³
Viscosity at 10°C: approx. 400 mPas.
Viscosity at 20°C: approx. 300 mPas.
Processing time at 10°C: approx. 35 - 50 minutes
Processing time at 20°C: approx. 25 minutes
Processing time at 30°C: approx. 10 - 15 minutes
Post-grouting time at 10°C: n.a.
Post-grouting time at 20°C: n.a.
Completely hardened 100%: after 7 days (20°C)
Minimum processing temperature: 10°C on the substrate
Delivery unit: 1, 6, 12 and 30 kg
Storage time: min. 6 months in a cool and dry place
Solid content: 100%
Adhesive tensile strength: Concrete rubble
The resin ( A ) and hardener ( B ) components are supplied in the correct mixing ratio except for the barrel deliveries. Pour the hardener into the resin component and make sure that the hardener component runs out completely. Then mix the entire mixture with a mechanical agitator at a maximum of 300 rpm (slow-running drill with stirring paddle inserted) very thoroughly. It is essential to stir thoroughly from the bottom and sides so that the hardener is also vertically distributed. Stir until the mixture is homogeneous (free of streaks); mixing time approx. 3 minutes. The material temperature should be approx. +15°C during the mixing process. Do not process the mixed material from the delivery container! Pour the mixture into a clean container and stir again thoroughly.
Application: When processing reactive plastics, the temperature of the substrate is critically important as well as the ambient temperature. Chemical reactions are generally delayed at low temperatures; this also extends the working, recoatability, overworking and hardening times. At the same time, higher viscosity increases consumption. At high temperatures, the chemical reactions are accelerated, so that the above-mentioned times are shortened accordingly. The average temperature of the substrate must be above the minimum temperature for complete hardening of the reactive plastic.
When applying outdoors, ensure that the material is protected from moisture for a sufficiently long time after application. If the surface is exposed to moisture too early, a white discolouration and/or tackiness may occur which can considerably impair the bond to the subsequent coating and must therefore be removed if necessary, e.g. by sandblasting. The material under this layer hardens perfectly.
Substrate condition: Cement-bound substrates must be solid, dry, fine-grained and load-bearing, free from cement paste layers, loose and crumbly parts as well as substances with a separating effect such as oil, grease, rubber abrasion, paint residues or similar. Pre-treatment of the substrate is usually required, such as sandblasting, shotblasting, high-pressure water jetting, milling or sanding. After substrate preparation, the peel strength of the substrate must be at least 1.5 N/mm². The concrete moisture on the surface should not exceed 4%. The temperature of the substrate must be at least 3°C above the prevailing dew point temperature. The substrate to be coated must be secured against rising damp. The DBV Code of Practice “Application of Reactive Resins in Concrete Construction, Part 2: Substrate” applies to the rest.
Application examples and material usage:
- Substrate treatment: Grinding or blasting of a sufficiently wide area above the crack, additionally blowing out the crack with compressed air.
Use commercially available special packers according to the manufacturer’s instructions. Before inserting, blow out the drill holes with compressed air. The crack is to be dammed in its full recognisable length. WILLPOX® 4160 filler is used for this and applied immediately. After this has hardened, grouting can be started using both the low-pressure and high-pressure methods. Our experience has shown that the best results are achieved in the first 20 minutes after mixing. After the grouting is completed, the packers are knocked off and sealed with WILLPOX® 4160 filler. The filling of cracks, including any ancillary work that may be required, such as the installation of packers or damming, should be carried out in accordance with ‘ZTV - Riss’ (Supplementary Technical Conditions for Cracks).
Brush methods: For horizontal cracks up to 0.5 mm wide, WILLPOX® 7146 is applied by brush until saturation.
Pouring: For horizontal cracks over 0.5 mm wide, the crack must be prised out in a V-shape and then cleaned with compressed air. Then cast with WILLPOX® 7146 until saturation.
Hollow screeds: At the highest points of the screed (make a metre mark), the screed is drilled out and grouted up to the outlet with WILLPOX® 7146. Make sure that a sufficient number of vent holes are made.