KEMKO 128 FlexDek Binder

Flexible Epoxy Binder For Mortar, Slurry and Chip Seal Overlays

KEMKO 128 FlexDek Binder is a two-component, solvent-free epoxy binder developed for use in protective overlays on concrete decks. It is specifically formulated to create abrasion- and impact-resistant surfaces, especially in settings that may be exposed to chemicals, vehicular and aircraft fluids, or deicing compounds. It is intended for use in mortar, slurry, and aggregate broadcast overlay systems.

The system includes the KEMKO 128 epoxy binder (Part A resin and Part B hardener) and selected aggregates. High silica sand is preferred for overlays and repair mortars, while mesh-graded aggregates are recommended for slurry and broadcast systems. For enhanced skid resistance on vehicular surfaces, materials like aluminum oxide or silicon carbide may be added. The material is also used as a primer for substrates prior to mortar or concrete application.

KEMKO 128 is suitable for overlays on concrete and steel surfaces in both structural and pavement repair contexts. Its primary use is for deck overlays to resist abrasion and chemical intrusion. It is applicable in airport runways, industrial flooring, and similar heavy-duty environments.

For mortar overlays, prime with the mixed binder at 8–10 mils (100–125 sq ft/gal), then apply while tacky. In multiple layer broadcast systems, apply binder at ~45 sq ft/gal, broadcast 8–10 lb/sq yd aggregate, cure 2–5 hours, and repeat as needed. Slurry coats require mixing 1 part binder to 2–2.5 parts aggregate, applied at 3/8" and finished with broadcasted aggregate (10–14 lb/sq yd), cured for 6–8 hours. The binder should be mixed in a 2:1 volume ratio and used within its pot life to avoid waste.

·      Environmental Conditions: Application and curing require substrate temperatures between 50°F and 90°F. Substrates must be dry; moisture presence can compromise adhesion.

·      Pot Life and Cure Times: Gel time is approximately 20 minutes (1 quart). Thin film hard dry time is around 5 hours. Full curing may vary based on temperature but is typically considered within 7 days.

·      Thickness Limits: Mortar and slurry systems should be limited to approximately 1 inch per lift, and broadcast systems to ½ inch per lift.

·      UV Resistance: The product remains flexible and does not embrittle under UV exposure, making it suitable for exterior applications.

·      Coverage: Coverage varies with aggregate and system type—e.g., primer coat at 100–125 sq ft/gal, broadcast layer binder at 45 sq ft/gal for first coat and 30 sq ft/gal for second.

·      Clean-up: Tools should be cleaned before the material cures using acetone or heavy-duty detergents.