Molecular Bonding

Molecular Bonding means a covalent bond – regardless of the substrate(s).

Molecular bonding is the latest advancement in ‘glue’ solutions. With most materials a molecular bond means that, chemically, a covalant bond is created between the surfaces being joined. A covalant bond exists when a pair of electrons is shared by the protons of two adjacent atoms.  A molecular bond provides a stronger, more durable result than gluing two pieces together.

When working with polymers and other space-age substances, i.e., nylons, silicons and UHMW’s, Tech-Bond Bonding Agents act as a monomer that bonds the polymers of each surface together.  In order to effectively bond these polymers, an adhesion promoter (Tech-Bond’s Poly Prep™) is required.  (see below)

Because of its performance advantages, Molecular Bonding is being used by many industries; aerospace, automotive, health care, etc., as a more efficient methodology for joining two surfaces together. You will also find molecular bonding to be a quicker, easier and a more efficient solution for your problem(s).  If you have any questions, or want more information, please call 877 565 7225.

Performance Advantages of Molecular Bonding. 

1) Durability
One of the many problems with glues and epoxies is that they degrade over time.  Covalant bonds created by molecular bonding agents do not degrade nearly as rapidly.  Molecular bonding provides the lasting performance desired by professionals.

2) Strength

Superglues have good tensile strength, but often have poor shear strength. Molecular bonding provides exceptional tensile AND shear strength.

3) Flexibility
Glues and epoxies do not perform well when used on materials that flex.  Glue joints become brittle and crack when flexed.  A molecular bond takes on the characteristics of the material being bonded.  If that material is flexible, the bond will be flexible.

Bonding UHMWs [Teflon(R) and Delrin(R)], nylons, silicons and the Polyolefins (polyethylene, polypropylene and polyurethane)

With Polyolefin plastics, UHMW type materials (Teflon®, Delrin®),  nylons and silicons use the Poly Prep to achieve lasting bonds.  When substantial strength is needed, rough the surface with steel wool or fine grit sandpaper, then spray or brush the Poly Prep on all area(s) of the surface to be joined.  Let the Poly Prep dry and wait 5 to 15 minutes (as indicated below) for plastic to cure.

  • Polyolefins – 5 minutes
  • UHMWs – 10 minutes
  • Nylons – 10 minutes
  • Silicones – 15 minutes

When both surfaces have cured, apply a Bonding Agent to one surface and gently spread the Bonding Agent so that both surfaces become coated.  Pressing the surfaces together will cause a slight bleed-out at the bond line.  After pressing, spray this bleed-out with A/A if necessary.  (Please test the A/A on the surface first to make sure that the surface finish will not be damaged.)

Let these bonds set for 24 hours before applying stress.

*May also need the Poly Prep to generate bonds with certain oily woods (ebon, etc), oily rubbers and/or ABS.

Bonding Hints and Tips

These hints and tips are copyrighted because they have been developed from experience, they work well and  they often contradict conventional wisdom.

Metal to Metal Repairs
For metals that oxidize, such as, aluminum, brass, copper, etc. you will need to use steel wool or sandpaper to rough the surface down to bare, shiny metal.  In all cases, the “cleaner” the metal, the better the bond.  Apply the bonding agent so that both surfaces are completely covered and either press firmly to remove the air between the two surfaces, or spray the Activator/Accelerator to set the bond.

Glass does not have any pores.  Therefore there is nothing for Tech-Bond’s technology to “grab” onto. Tech-Bond™ will work as well as most CAs, but will not do glass permanently.

To Prevent Degradation From Weather in High Stress Areas
When Tech-Bond™ bonded areas will be exposed to a significant amount of weather, use sufficient Tech-Bond™ Bonding Agent to create a shiny area all the way around the bond line.

Extra Strength 
Any time additional strength is needed, rough the surfaces and then, after the join is made, apply the bonding agent along the seam of the join, spray with Tech-Bond’s Activator/Accelerator and let the bond cure for 24 hours.
Additional strength can also be achieved by using Tech-Bond’s Filler, a silica sand compound, to coat the join, building surface area, thereby increasing bond strength. If you want to go beyond that level of strength and create optimum strength, you can wrap cotton cloth, cord or tape around the join and apply Tech-Bond™ Bonding Agent over the cotton (spray A/A).

Bonding Difficult Butt Joints
Frequently there are car parts that need to be repaired where there is not sufficient surface area to attain the needed strength.  When that situation occurs, utilization of Tech-Bond™ Filler will create operational strength in those repairs, even with repairs involving the poly-plastics, i.e., the plastics fenders, shrouds, etc.

The Poly Prep must be used as a Primer on the poly-plastics and the surface of the plastic must be roughed with sand paper or steel wool before bonding.

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