Description
Overview
Akabond 621 Knife Grade is a two-part, thixotropic epoxy for bonding and repairing light-colored natural stone. The thick paste resists sagging and can be used for stone joints, cracks and holes, with resin-only, hardener-only and combined-kit selections.
Features
- Bonds suitable stone to stone, concrete, glass, metal or wood.
- Solvent-free formulation with low moisture absorption.
- Freeze-thaw durability and finishability after cure.
- Can be tinted with compatible coloring pastes.
What's Included
- Resin selection: Part A, 1/2 gallon only.
- Hardener selection: Part B, 1 quart only.
- Kit selection: Part A 1/2 gallon plus Part B 1 quart.
Specifications
- Mix ratio: 2 parts resin to 1 part hardener by volume or weight
- Mixed consistency: Thixotropic paste
- Mixed appearance: Off-white to clear
- Mixed viscosity: 140,000–250,000 cP; Brookfield spindle 7 at 10 RPM
- Pot life: 17–23 minutes for 150 g at 77°F (25°C)
- Hardening time: 6–8 hours at 77°F (25°C)
- Minimum application temperature: 40°F (5°C)
- Peak service temperature: 160°F (71°C), per linked sheet
Size Options
- Part A (Resin) - 1/2 Gallon
- Part B (Hardener) - 1 Quart
- Kit - Part A 1/2 Gallon + Part B 1 Quart
Downloads
Applications
Use for suitable interior or exterior natural-stone repair, bonding and filling. Akabond 621 is not UV-stable and will yellow over time outdoors. Consider that color change before using it in a visible exterior repair, especially on light stone.
Selection and Use
- Mix the correct proportions thoroughly, scraping the sides of the container. Warmer conditions shorten working time; stop working once gelling begins.
- Clean, dry surfaces give the best results. Use clamps or jigs when needed to hold a thin bond line.
- Stone dust may be incorporated as directed for resin-mortar fills; test the resulting color and finish first.
- Use ventilation, gloves and eye protection as directed in the linked safety information.
