This blog post provides step-by-step guidance on how to install a stair handrail using the epoxy structural adhesive, Belzona 7311.
What is the Epoxy Structural Adhesive, Belzona 7311?
Belzona 7311 is a fatigue resistant epoxy structural adhesive, optimised for structural bonding applications requiring high mechanical strength, cleavage and shear resistance. Belzona 7311 is ideally suited for bonding applications subjected to cyclic and repeated load.
Key Benefits of Belzona 7311:
- High resistance to cyclic fatigue and peel/cleavage forces
- Excellent adhesion to metallic substrates
- Suitable for dry or wet service between -30°C (-22°F) and 60°C (140°F)
- Cold-curing, solvent free material keeps application environment safe
- Easy to mix and apply without specialist tools
More information about Belzona 7311 can be found in the following blog post titled: Belzona Adds First Ever Epoxy Structural Adhesive to its Polymeric Portfolio
How to Install a Stair Handrail: a Step-by-Step Guide
The first step is surface preparation. Grit blast the mating faces to the requirements of SSPC SP 10 or ISO 8501- SA 2 ½ cleanliness with a minimum average 75-micron (3 mils) profile. Use tape to mask the repair area and prevent excess product on the structure.
Belzona 7311 has a mixing ratio of 3:1 parts base to solidifier, both by weight and by volume, and is simple to mix due to its ‘soft paste’ properties. Simply mix the components using a Belzona spatula in the recommended figure eight motion.
Using the same spatula, score the mix for any remaining streakiness.
Apply the Belzona 7311 system to both the base of the handrail and the structure using a short-bristled brush, ensuring it fully wets the profiled substrates.
Apply additional product to one of the mating faces creating a ‘peak’ build-up in the center. This reduces the potential for air entrapment within the bond line once both mating forces are pressed.
Now that the product is applied, position the handrail on the stair set.
The mating faces are firmly pressed together until a maximum thickness of 2mm (80 mils) is reached. Use clamps/magnets/ratchet straps where possible to allow the product to extrude and ‘squeeze out’ any air pockets.
Finally, remove the tape. The product should be allowed to cure for full adhesive strength before any loads or stresses are exerted.