Silicones and Sealants

Boz Altinay Construction Industry Inc.

Silicones and Sealants: Reliable Aids in Sealing and Filling Solutions

Silicone and sealant products , an indispensable part of construction chemicals  , are used to provide sealing, filling, and flexibility in various parts of buildings. They are particularly applied to doors, windows, bathrooms, kitchens, facades, and roofs to provide protection against water, dust, and air. These products, with their different formulations, vary according to the application area and offer high performance.

What is silicone?

Silicone is an elastic, air-curing, and sealing material. Typically  single-component , silicones dry to form a durable and flexible film layer upon application.

Types of Silicone:

  • Acidic (acetoxy) silicone:  Provides high adhesion to glass, ceramics, and smooth surfaces.

  • Neutral Silicone:  Compatible with sensitive materials such as metal, PVC, wood, and painted surfaces.

  • High Temperature Resistant Silicone:  Specially formulated for areas exposed to high temperatures such as near stoves, chimneys, and ovens.

  • Antibacterial Silicone:  Used in areas where hygiene is important, such as bathrooms and kitchens. It is resistant to mold and mildew.

What is mastic?

Mastic is a generally elastic  and  semi-solid  filling material used to fill gaps between structures, insulate cracks, and provide watertightness between surfaces  . Mastics have different chemical bases and can be acrylic, bitumen, polyurethane, silicone-modified, or hybrid.

Types of Sealants:

  • Acrylic Sealant:  Used in interior spaces for filling under paint applications. It is paintable.

  • Bitumen Mastic:  Used in waterproofing applications. Compatible with asphalt and concrete surfaces.

  • Polyurethane Sealant:  It has high elasticity and strong chemical resistance. It is used in exterior facades, joints, and prefabricated structures.

  • MS Polymer Sealant (Hybrid):  Provides high UV resistance, paintability, and versatile surface adhesion.

Application Areas

  • Sealing in door and window frames.

  • Gap filling and insulation in wet areas such as ceramics, sinks, and shower cabins.

  • Exterior applications using glass and aluminum combinations.

  • Flexible filler for expansion joints.

  • Wood, metal, PVC, concrete and brick joints.

  • Sealing solution for panel and roof systems.


Advantages of Using Silicone and Sealant

✅  High Flexibility:  Adapts to structural movements, does not crack or separate.
✅  Waterproofing:  Silicone-based products, in particular, provide complete watertightness.
✅  Easy Application:  Can be applied directly from the cartridge or bucket, cures quickly.
✅  Wide Surface Compatibility:  Provides high adhesion to various surfaces.
✅  Aesthetic Appearance:  Leaves a smooth and aesthetically pleasing surface after application.
✅  Mold and UV Resistance:  Antibacterial silicones and hybrid sealants offer long-lasting use.

Frequently Asked Questions (FAQ)

What is the difference between silicone and sealant?

Silicone is more flexible and waterproof; it is generally used in wet areas. Mastic, on the other hand, has a different chemical basis and is preferred for larger surfaces and joints.

Which silicone is used where?

Acidic silicone is used for glass and ceramics, while neutral silicone is used for delicate surfaces such as metal and PVC. Antibacterial silicones are ideal for bathrooms and kitchens.

Can mastic be painted?

Acrylic and hybrid sealants can be painted after drying. Silicone sealants generally cannot be painted.

How long does it take to dry after application?

Depending on the product type, this varies from 15 minutes to 24 hours. Manufacturer’s instructions should be followed.