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How Much Is "Sufficient" When It Comes to Adhesive?

April 16, 2020 business

More adhesive is not necessarily better if you need an effective bond or seal. Covering the bond surface is the principle requirement. The type of adhesive and the bonding atmosphere have loads to do with how much is “enough”. These are some common issues when using an excessive amount of adhesive. The probable causes of those points and prompt solutions are good beginning points for bothershooting.

These are some widespread issues when using an excessive amount of adhesive. The probable causes of those issues and suggested solutions are good starting points for bothershooting.

Note:

At all times contact the manufacturer for additional assistance

When using adhesives always check the safety precautions

Cyanoacrylate (Prompt) Adhesives

Problem – Gradual cure time.

Cause – Low moisture to adhesive ratio. Cyanoacrylates bond when trace quantities of moisture deactivate the adhesive’s built in stabilizer. Differing quantities of trace moisture are current in the surfaces being bonded, as well as within the air. If there’s too much adhesive in proportion to the amount of moisture, treatment pace will be reduced.

Answer – Tests needs to be made to find out the smallest quantity of adhesive to achieve the desired bond. Production consistency will be improved with regulated temperature and humidity controls. (Testing can also be a more financial and safer process when making essential bonds.)

Problem – white haze or crust on the completed piece.

Cause – Cyanoacrylates are designed to bond two mating surfaces. The quantity of adhesive required is directly associated to the dimensions of the surfaces. Extra adhesive squeezed out of the bond area cures very slowly allowing enough time for the cyanoacrylate to volatilize, remedy within the air and fall back to the surface as a white residue.

Resolution – Reduce the amount of adhesive used to get rid of squeeze out or use a surface activator / accelerator to treatment the squeeze out.

The manufacturer’s technical help staff may also help with this issue.

Anaerobic Adhesives

Problem – Slow or incomplete cure.

Cause:

massive hole between mating surfaces;

publicity to oxygen. Anaerobic adhesives treatment when metal ions on the substrates surface activate the treatment – however only in the absence of oxygen.

Resolution:

Check the manufacturer’s recommendations for maximum hole fill. Choose the grade appropriate to the application.

Reduce the quantity of adhesive used.

Get rid of excessive squeeze out from the adhesive tube or container. Use a clean dry cloth to wipe away any excess.

When troubleshooting a bonding problem, step one is to determine if the problem is cohesive or adhesive in nature. Simply put, you wish to work out if the problem is related to

how the adhesive sticks to the substrates (component parts) or

to the state of the adhesive in the bond area.

Adhesive Failure – The adhesive bond to one of the surfaces fails. This can be referred to as Interfacial Failure

Some causes of Adhesive Failure – and solutions:

Grime or different contaminants on substrates – clean thoroughly before making use of adhesive.

Clean surface – roughen substrate with suitable method (abrasives, chemical and many othershing, for ex).

Hard to Bond plastics – use manufacturers beneficial primer.

Joint design/bond space – modify the joint design or improve the bond area

Cohesive Failure – The tearing aside of an adhesive or sealant as the joint is stressed. The adhesive remains bonded to both surfaces however the adhesive itself cracks or tears down the middle. This happens if the adhesive (bond) capabilities exceed its cohesive capabilities.

Possible cause of Cohesive Failure – and suggestion:

Adhesive unsuited to application – contact manufacturer for advice

Substrate Failure – The material being bonded fails before the adhesive.

In all cases of substrate failure, it is important to first establish the source of the stress that caused the failure. Efficient adhesive selections should be suitable for the stresses on every joint as well as the substrate(s).

Examples of Substrate failure, causes – and suggestions:

Stress cracks at or close to the bond area could also be the results of solvent exposure. Select solvent free adhesives; wipe away excess adhesive before cure.

Delaminated or damaged substrates usually indicate a necessity for stronger substrates. In some cases, redesigning the joint might do the trick.

Surface Activated Structural Acrylic Adhesives

Problem – bond energy lower than expected.

Cause – too much initiator used. Because initiators are very thin and water like substances, they’re practically invisible once applied to some surfaces. Overuse of an initiator can reduce the energy of the cured bond.

Resolution – use in keeping with directions on the technical data sheet.

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