What is Bond breaker tape used for?
Used in joint sealing applications, Bond Breaker Tape stops joint sealants from adhering to surfaces and preventing “3 sided adhesion” which limits the sealants ability to accommodate movement. Bond breaker Tape is black self adhesive polyethylene tape that has excellent conformability to irregular surfaces.
What is Bond breaker tape made of?
Polyethylene
Most tapes useful as a ‘bond breaker’ are made of low surface energy polymer films such as PTFE and Polyethylene and are can be used when a joint cavity is too shallow to allow the use of a backer rod or in other situations where it is undesirable to have sealant adhere to a particular surface.
What is a bond breaker?
A bond breaker is the layer of separator substance applied in different forms between adjoining solid surfaces. It is used to ensure that there is no adhesive molecular bond between the surfaces.
When would you use a bond breaker?
A bond breaker is a substance applied to concrete surfaces to guarantee that there is permanent bonding between the surfaces. Bond breakers are normally used on tilt-up walls and precast segments to ensure the right pieces are cast together.
What is a bond breaker in waterproofing?
The definition of a bond breaker according to AS 3740 is: “A system that prevents the membrane bonding to the substrate, bedding or lining.”
Is polyurethane a bond breaker?
Polyurethane sealants are not bond breakers, where they do not allow the membrane to release when subjected to movement. These are termed as fillet joints, and therefore do not comply with AS3740 3.13. 7 requirements. Neutral cure silicone, non-paintable polyurethanes or vinyl tapes are used as bond breaker materials.
Do I need bond breaker?
Bonded membranes are required to have bond breakers installed at all floor/wall, hob/wall, and junctions where movement might be expected. Polyurethane sealants are not bond breakers, where they do not allow the membrane to release when subjected to movement.
How does Bond Breaker work?
A bond breaker, as stated in Australian Standard 3740 is a “System that prevents the membrane bonding to the substrate, bedding or lining” But why wouldn’t you want the membrane to bond to the surface? Take a wall/floor junction for example, the most critical movement joint and source of most waterproofing failures.
Does a concrete driveway need expansion joints?
Every concrete slab, inside (basements, garages, etc.) or outside (driveways, patios, entries, etc.) are required to have joints every eight feet horizontally and vertically. Expansion Joints provide space between concrete slabs as a buffer for expansion on hot days and contraction when it is cold.
What kind of adhesive is bond breaker tape made out of?
The tape features a polypropylene backing with a synthetic rubber resin adhesive with high sealant release performance. Good dispensing properties make it suitable for on-site applications.
Where to place 3M bond breaker tape 8891?
If the sealant becomes attached to the filler, it cannot seal the joint against water and debris. To ensure free movement in the joint, bond breaker tape is placed between the joint sealant and joint filler. 3M™ Bond Breaker Tape 8891 features a strong polypropylene backing with a synthetic rubber resin adhesive.
Why do you need bond breaker tape for joint sealant?
Joint sealant must allow free extension and compression during the opening and closing of joints to work properly. If the sealant becomes attached to the filler, it cannot seal the joint against water and debris. To ensure free movement in the joint, bond breaker tape is placed between the joint sealant and joint filler.