Acrylic sealants: properties and scope

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Whatever the merits of silicone sealants, they are far from universal. In some cases, experts recommend giving preference to acrylic sealant. What it is made of, what it is and how it differs from silicone – you will learn from our article.

Acrylic sealant

Why is acrylic sealant good

All sealing compounds are traditionally divided into three groups according to the state they accept after application:

  1. Non-hardening sealants – various mastics (by the way, these include ordinary plasticine).
  2. Hardening sealants – materials that harden as a result of a chemical reaction (silicones already known to us).
  3. Drying sealants – curing occurs due to the slow evaporation of water.

The most famous representative of the latter group is an acrylic-based sealant. After application, it dries up within 24 hours due to the evaporation of the liquid that is part of it. Acrylic sealants are based on an organic substance – polymethyl methacrylate, which is currently one of the most durable plastics.

Acrylic sealant

The unsurpassed properties of acrylic – strength, low thermal conductivity, thermoplasticity and lightfastness – have found their application in the space and air industry, the manufacture of plexiglass, acrylic bathtubs and even medical prostheses.

In the production of acrylic sealant used:

  • aqueous dispersion of the basic substance (polymethyl methacrylate);
  • thickeners;
  • fillers;
  • defoamers;
  • Surfactants and antiseptic additives;
  • ammonia solution;
  • plasticizers.

The main area of ​​application for acrylic sealants is fixed and inactive joints. Most manufacturers recommend using acrylics at temperatures from -20 to +70 degrees and at the maximum possible deformation threshold of 15%.

A classic acrylic sealant is afraid of direct contact with water, which is not surprising – after all, it is based on an aqueous dispersion that can dissolve. Therefore, the use of this composition is recommended only inside dry rooms: for sealing cracks between the wall and the window sill, cracks in the walls and wooden coatings.

Acrylic sealant

Among professionals, there is no single opinion about the widespread use of acrylic sealants, however, their advantages, when used correctly, are obvious:

  1. Price – with the same volume, acrylic is about one and a half times cheaper than high-quality silicone sealant.
  2. Ease of choice and use – unlike silicone sealants, acrylics cannot boast of variety, but are more versatile.
  3. Environmental friendliness – the water base is non-toxic and rarely causes irritation, so you can work with acrylic without additional protective measures. In addition, the absence of solvents in the composition guarantees the fire safety of the material.
  4. Excellent adhesion to most materials – acrylic adheres even to porous surfaces.
  5. Possibility of restoration of the finished joint and its coloring.
  6. Good vapor permeability – especially important when installing plastic windows. The use of acrylic sealant allows steam to go outside without hindrance, and does not accumulate in the form of condensation between the seams.

Types of acrylic sealants: a brief description

The desire to improve the formulation and properties of acrylic sealants led to the emergence of new types – waterproof and siliconized. The addition of silicones and fungicides allows you to give acrylic the technological properties of a silicone sealant, while maintaining its own advantages..

Acrylic non-waterproof Acrylic waterproof Acrylic siliconized Silicone
Applications For interior work For interior work For interior and exterior use For interior and exterior use
Adhesion High High High High
Aggressiveness to metal surfaces Not Not Not Acidic silicone sealants have an extremely high
Use temperature From +5 to +40 ° С From +5 to +40 ° С From +5 to +40 ° С From +5 to +40 ° С
Operating temperature From –20 to +70 ° С From –20 to +70 ° С From -30 to +80 ° С From -40 to +150 ° С
Water resistance No, short-term contact with moisture is allowed Medium, cannot withstand direct contact with water Waterproof after curing Water resistant
Elasticity 10-15% 10-15% Up to 200% Up to 400%
Suture restoration possibility Yes Yes Yes Not
Sustainability Does not contain solvents, does not require additional protection measures during work Does not contain solvents, does not require additional protection measures during work Does not contain solvents, does not require additional protection measures during work Contains solvents, requires additional ventilation during operation
Possibility of staining Yes Yes Yes No, the paint cracks and crumbles
Indoor durability Up to 10 years Up to 10 years Up to 15 years Up to 15 years
Durability of operation in outdoor structures Up to 2 years Up to 2 years Up to 3 years Up to 3 years
UV resistance High High High High

It should be noted that in the above table, average acrylic and silicone sealants are considered. In highly specialized types, the characteristics will differ – there are sealants with increased thermal and moisture resistance, as well as with special antifungal additives.

Acrylic sealant

When buying a sealant, first of all, you need to decide what it should protect from and what external influences it will be subjected to. Do not forget that acrylic sealant due to its composition costs about one and a half times cheaper than silicone, and in quality it is practically not inferior. Therefore, if there is no need for enhanced water resistance, it is better to give preference to acrylic or silicone sealant..

Another additional plus of acrylic is that it is rarely counterfeited, so the risk of acquiring counterfeit products is extremely low. Despite this, when buying, it will be useful to study the attached certificates, instructions for use and check the shelf life of the acrylic sealant.

Applications of acrylic sealants

Acrylic sealants are easily corrected during application, can fill rather wide gaps and cracks, and practically do not deform after hardening. High-quality acrylic will not turn yellow like a silicone sealant and will not crumble like polyurethane foam under the influence of ultraviolet radiation. And the affordable price finally makes it the optimal sealant for interior work:

  • repair of cracked furniture;
  • restoration of parquet and wooden floors;
  • sealing the laminate;
  • installation of door and window frames;
  • installation of skirting boards;
  • elimination of cracks in walls and window sills;
  • sealing pipe and tile joints.

Acrylic sealant

You can work with acrylic sealant in residential premises – it does not emit toxic substances when cured and practically does not smell, and the tool can be easily washed off with water after using acrylic. In the next article, we will help you choose an assembly gun and tell you about all the intricacies of using household and professional foam..

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