Things you need to know about adhesives and sealant

Adhesive spreads bond over a large surface area and the bonds can be stronger than welds or rivets. It helps to increase the rigidity of your body and it is critical to vehicle handling performance. The adhesive sealant is used to close gaps and bond items together. Adhesive can exist in a liquid state or powder state.

A sealant can also be used as an adhesive and it is known to be durable and flexible. Both have strong binding properties and that can be applied to almost any surfaces, including metal, glass, and plastic.

Addressable benefits of adhesives and sealants

The development of new materials and many applications put additional challenges on processing technology. Some of the benefits of using adhesives and sealants are given below:

Materials

With specific application and bonding technology, adhesives and sealants used to bond any combination of materials with each other and thereby creating long-lasting bonds.

Processing

The use of bonding technology in the production process allows the material properties of the substrates to be r retained. For welding, soldering, and brazing, the bonding process requires little head input and unlike when rivets and screws are used.

Joining

To join any two materials together, the bonding process is required. This also allows new construction methods to be employed.

Design

The use of bonding technology in industrial production can save your time, gives rise to economic benefits.

Properties of sealants

Sealants are usually chosen to fill the gaps and it resists relative movement of the substrates. Sealants are lower in strength when compared to adhesives and it also has better flexibility. A sealant can be used to bond a substrate in order to perform various functions.

Sealants are like adhesives in many ways and some formulations actually provide both functions. Mechanical properties of sealants include modulus of elasticity, elongation, tensile strength, compressibility, fatigue resistance, and tear resistance. Depending on the application, the sealant may require very little strength or high strength.

Functions of sealants

Sealants are usually used as a barrier for means of any protection. Sealants are used to exclude moisture, dust, chemicals, dirt and contain a gas or a liquid. Sealants are often used as a coating to protect a surface and it can eliminate vibration and noise, performs a joining function and improves the appearance. Sealants can also be used as thermal or electrical insulators, fire barriers, and they may be used for filleting and smoothing.

Sealant has three main basic functions as given below:

  1. Sealants fill a gap between two or more substrates.
  2. It forms a barrier for protection through the physical properties of the sealant itself and by adhesion of the substrate.
  3. Sealant maintains the sealing properties of the expected lifetime, environments and service conditions.

Causes of sealant failure

Incorrect sealant

Sealant installed was not appropriate for the specific application due to inadequate performance characteristics.

Aging

Sealant has reached its maximum service life and has become dry, brittle, cracked, crazed and it shows the signs and symptoms of significant aging.

Incompatibility

Substrate and sealant are incompatible causing an adverse reaction at the substrate or sealant interface. To avoid this cause of failure, use a proper adhesive sealant for bonding applications.

Bottom line

Adhesives and sealants play a main role in bonding a wide variety of substrates and materials. You should use a proper sealant to avoid the above causes of sealant failures.

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