Sealants and their types


During construction we need to make our home water proof and seal the joints of glass and frame of glazed doors and windows. After construction when we start living in home, sometimes we encounter the undesirable problems of seepage, leakage or cracks which cause discomfort to us. In all these situations we use Sealants.

Basically Sealants are chemicals having excellent adhesive properties. They not only make our home water proof but also arrest seepage or leakage and fill up the cracks. In other words, Sealants are very important and useful building material which is used both during and after construction of our home.


Types: On the basis of their uses there are four types of Sealants used in construction activities.

  1. Polysulphide Sealants: These have very good adhesive properties. After application these convert into a tough rubber seal which makes the affected area water resistant. These are used to repair cracks in walls, beams, slabs etc., joints of pipes and air conditioning ducts, expansion and contraction joints.
  2. Acrylic Sealants: They posses low shrinkage and excellent adhesive properties. These are ideal for filling up the gaps of width 4mm to 20mm. Hence they are generally used to fill the gaps between window sills and wooden or metallic window frames. They are very easy to use and suitable for internal and external applications.
  3. Silicon Sealants: These are the commonly used Sealants having transparent colour. After drying they become waterproof and flexible. They have the property to withstand high temperatures. These are mostly used to fill up the joints of glass and frames of doors and windows.
  4. Polyurethane Sealants: These are shrinkage free and UV resistant having excellent adhesive properties. They are widely used in high rise building for flooring, plumbing and sanitary works. They are used for filling up contraction and expansion joints.

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