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DESCRIPTION AND RECOMMENDED USES: 100% solids, Dura-Coat Krete-Flex 880 is a high elongation, elastomeric, hybrid-epoxy. It is ideally suited for expansion joint sealing and crack repair, and it is completely compatible with epoxy coatings. The elastomeric aspect delivers a tough, flexible resilience while the epoxy aspect provides improved water and chemical resistance and shelf stability. Dura-Coat Krete-Flex 880 epoxy reactivity eliminates the moisture sensitivity and toxicity associated with traditional urethanes. Dura-Coat Krete-Flex 880 is a light paste and is easily applied up to 250 mils without slump.
| Maximum Temperature (Dependent on service) | Wet Service | Dry Service | 82°C | 93°C | 180°F | 200°F |
|---|---|---|---|
| Chemical Resistance | Water | Alkalis | Inorganic Acids | Organic Acids | Organic Solvents | Excellent | Good | Fair | Fair | Poor | |
| Elongation | High | ||
| Specific Gravity | 1.8 | ||
| Viscosity | Light paste | ||
| Pot life | 55 MIN/KG at 72ºF | ||
| Vertical SAG Resistance at 21°C (70°F) and 6.4mm (250mils) | No sag | ||
| Coverage for 10Kg kit | 20sf@120mils | 1.85m²@3mm | |
| Mix Ratio | 2:1 by weight | Base: Activator | |
| Color | Grey | ||
| Shelf life (unopened containers) | 3 years at 55-95ºF (13-35ºC) | ||
Surface Preparation
Proper surface preparation is critically important for the long-term performance of the Dura-Coat Krete-Flex 880.
The prepared concrete surface must be structurally sound, free from all contaminants and roughened to an >ICRI CSP 3 profile (similar to #60 grit sandpaper). If using with Dura-Coat Krete-Seal 800, surface may be damp, but not wet i.e. no free-standing water. Dura-Coat Krete-Flex 880 can be applied on damp concrete without using Dura-Coat Krete-Seal 800.
A vapor barrier (Krete-Seal 800) is required for slab on grade application. If no vapor barrier is present, check for vapor transmission.
Surface Cleaning & Profiling Methods
Hydro-Blasting Scarifying
Steel Shot-Blasting. Dry Abrasive Blasting
Mixing
Thoroughly mix Activator into Base with mixing stick or drill with low-speed mixing blade scraping sides and bottom of container or mixing board. Mix by weight 1-part Base to 1-part Activator. Mix thoroughly to produce an even colored and streak-free material. THINNING: Never thin.
Application
Application temperature range 10°C (50°F)-32°C (90°F) (substrate).
Dura-Coat Krete-Flex 880 may be applied by notched squeegee, putty knife or caulk gun.
To avoid sagging on vertical surfaces the maximum wet film thickness should be up to 6.4mm (250 mil) per coat.
| 16°C (60°F) | 25°C (77°F) | 32°C (90°F) | |
|---|---|---|---|
| Tack Free | 6 hours | 4 hours | 3 hours |
| Light Load | 12 hours | 10 hours | 8 hours |
| Overcoat End | 14 hours | 12 hours | 10 hours |
| Full Load | 48 hours | 36 hours | 18 hours |
| Full Chemical | 96 hours | 72 hours | 36 hours |
Clean Up
Tools must be immediately cleaned after usage by using industrial alkaline detergent.
Safety
Before using any products, review the appropriate Safety Data Sheet (SDS) or Safety Sheet for your area. Follow standard confined space entry and work procedures, if appropriate.