Akabond 621 KG Knife-Grade Structural Epoxy – Sag-resistant, Two-Part
Akabond 621 KG Knife-Grade Structural Epoxy – Sag-resistant, Two-Part
Akabond 621 KG is a clear, knife-grade two-part structural epoxy for stone, and this item is the Part A resin on its own, a 1/2 gallon container that mixes 2:1 by volume with the Part B hardener.
Key Features
- Part A resin only. This container will not cure by itself; the matching Part B hardener is a separate item and both are needed to make a working system.
- Mixes 2:1 by volume, Part A to Part B. A full unit is 1/2 gallon of Part A - two quarts - to 1 quart of Part B.
- KG in the name stands for knife grade: a high-viscosity, sag-resistant clear gel that holds its shape on a vertical or overhead joint.
- Used for stone repair, crack filling, lamination, seaming, and bonding stone to other materials.
- Freeze-thaw durable and color-stable under UV, so it is rated for exterior work as well as interior; it can be tinted with epoxy coloring paste to match the stone.
- Akabond is a Wood & Stone product made by Axson and distributed under the Tenax callsign; it is not a Tenax-manufactured epoxy.
Who Is This For?
Fabricators and restoration crews doing structural stone repair - filling cracks, laminating edges, seaming, and bonding stone to metal or other substrates - who need a clear gel that will not sag out of a vertical joint while it cures. Shops that already hold Part B and are simply replenishing resin are the main buyers of this half on its own.
What This Is Not For
This is half a kit, so it is the wrong purchase for anyone who does not already have hardener on the shelf - the Akabond 621 KG Part B is the other half and nothing cures without it. Knife grade is also the wrong viscosity for a job that needs the resin to run into a hairline crack under gravity; a flowing adhesive such as the Superior Stone Products Water-Clear Polyester Stone Adhesive in the flowing grade suits that.
Frequently Asked Questions
Does the KG in Akabond 621 KG mean kilograms?
No. KG stands for knife grade, the high-viscosity sag-resistant gel formulation, and 621 is the model number. The name is Akabond 621, knife grade - it is not a weight.
What is the mix ratio?
Akabond 621 KG mixes 2:1 by volume, Part A resin to Part B hardener. In container terms that is 1/2 gallon of Part A, which is two quarts, to 1 quart of Part B.
Does this item include the hardener?
No. This container is Part A resin only. The Part B hardener is a separate item and both parts are required.
Who makes Akabond?
Akabond 621 KG is a Wood & Stone product made by Axson, distributed here under the Tenax supplier code. It is not manufactured by Tenax.
Can it be used outdoors?
Akabond 621 KG is published as freeze-thaw durable and color-stable under UV exposure, which is what makes it usable on exterior work.