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Selection of the Right Adhesives

Date:28-12-2016

Adhesives are basically a material which usually in liquid or semi-liquid state and stick at least two items together. They are used very vastly around us due to the fact that they are easy to use and portable. Their uses extend from fixing the soles of shoes to repairing of wooden furniture. Although we may be oblivious to the fact, if we actually take notice, the use of adhesive is very important to us.

Carbon fiber composites make the car weight reduction. However, the carbon fiber poses a variety of joining challenges to engineers. They are faced with the need of choosing between mechanical fastening and adhesive bonding. Each of these assembly processes have pros and cons that need to be evaluated. The benefits of adhesive glue include

· Faster cure time

· Higher moisture resistance

· Superior resistance to high temperature

· Increased chemical resistance

Furthermore, they can produce continuous bond lines, producing strong joints which feature a good stress distribution. On the other hand, rivets and spot welds produce point source load management which often requires heavier, thicker materials. Adhesives provide inherent galvanic corrosion protective cover when joining together dissimilar materials- particularly carbon fiber composites.

Contact Adhesives

Where strong bond is required contact adhesives are not recommended. They’re handy in normal use. Apply adhesive on the surfaces and wait for sometime. Then join both the surfaces and hold them tightly for some time.

Cyanoacrylate Adhesives

These adhesives are Cyanoacrylate esters based and are known for strong bonds. These adhesives are very easy to use and serve the purpose well. Put a small amount of these adhesives on the surface and join the other surface with it. Hold it for 10 seconds and you have a strong bond. These work by coming in reaction with a thin film of water on most surfaces. Too much glue or too much water will result in a weak bond at joints. No clamps are required to hold the two surfaces together. They are good at providing quick joints.

It is important to use these adhesives with ample care. Any contact with human skin will make a strong bond. So, it is advisable to avoid any contact with hands, especially your eyes. If possible use polythene gloves or goggles to prevent any contact with adhesives. Rubber gloves are not suitable for these kinds of adhesives. It is for this reason; keep those adhesives at places where children cannot reach them. In case you get this Cyanoacrylate on your skin, immediately put your hands into the warm soapy water and keep them there till it soften. Scrub it off the skins with the help of teaspoon handle.

Epoxy resins

Epoxy resins are used widely in the market. They are also powerful adhesives but they need more time to set, about 24 hours. These adhesives come in two parts a hardener and a resin. Both are mixed shortly before they are applied. Strong bond results due to the chemical reaction between resin and hardener that produces heat. Warming the joint can reduce the setting time.

Epoxy resins are not useful for flexible joints, as they inclined to be brittle after setting. Two-part acrylic adhesives are also there which are used for heat resistant metal joints. But these are not as effective as epoxy resins which have a strong gap filling properties. Apply one part on one surface and second part on second surface and hold the two surfaces joined together for 2-3 minutes. In this time the adhesive will set in position. Although the joint will become strong in few minutes but for full strength it will take up to 24 hours.The article about Hot Melt Adhesive from hotmelt-zp.com .