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WHY DID WE DECIDE TO USE ACRYLIC COATINGS FOR THE FINISHES OF OUR WOODEN HOUSES INSTEAD OF POLYURETHANE?

General

Wood finishes are essential not only for enhancing the visual appeal of wooden surfaces but also for protecting them from everyday wear and environmental exposure. Among the various types of wood finishes available, acrylic and polyurethane (PU) coatings are popular choices, each offering different characteristics and applications. Both are widely used in the wooden furniture and prefabricated construction industries.

Understanding Acrylic Finishes

Acrylic finishes are synthetic wood coatings that form a protective layer on wooden surfaces while enhancing the natural appearance of the wood. Depending on the formulation, acrylic coatings can provide good resistance to moisture, UV exposure, and everyday wear and tear. They can also provide a clear, durable finish that helps preserve the natural appearance of wood in a variety of applications.

Advantages of Acrylic Finishes

The following characteristics of acrylic finishes make them a suitable choice for a variety of wooden surfaces:

  • Versatility – Acrylic finishes are highly versatile and can be used on a wide range of wood species, including various types of hardwood.
  • Clarity and Transparency – Clear acrylic finishes allow the natural grain and appearance of the wood to remain visible. Depending on the formulation and sheen, they can provide a clear and attractive appearance without unnecessarily altering the natural color of the timber.
  • Resistance to Chemical and Physical Exposure – Depending on the specific formulation, acrylic coatings can provide good resistance to chemical exposure, weathering, and physical wear. This makes them suitable for both interior and exterior applications when the appropriate exterior-grade product is selected.
  • Suitability for High-Wear Areas – Certain acrylic formulations provide good resistance to wear and abrasion and can therefore be suitable for surfaces subject to frequent use and handling.
  • Resistance to Yellowing – Acrylic coatings are generally known for good resistance to yellowing, particularly when compared with some conventional coating systems. This characteristic can help maintain a more stable appearance over time.

Understanding Polyurethane (PU) Finishes

Polyurethane finishes are synthetic coatings known for their durability, moisture resistance, and, depending on the formulation, resistance to UV exposure. Both matte and high-gloss PU finishes can provide a strong protective layer that enhances the appearance of wood while offering good resistance to wear and moisture.

Advantages of PU Finishes

The advantages listed below make polyurethane finishes a reliable choice for a wide range of applications:

  • Transparency – Clear PU finishes can provide excellent transparency, allowing the natural grain and character of the wood to remain visible.
  • Elasticity – Depending on the formulation, the elasticity of polyurethane coatings can allow them to accommodate some dimensional movement of wood caused by changes in temperature and humidity, thereby reducing the risk of cracking or failure.
  • Chemical and Physical Resistance – Polyurethane coatings generally provide good resistance to chemical exposure, abrasion, and physical wear, making them durable in many demanding applications.
  • Enhanced Appearance – PU finishes can provide a rich and lustrous appearance, ranging from matte to high gloss, thereby enhancing the visual appeal of furniture, flooring, and other wooden surfaces.
  • Versatility – Polyurethane coatings are available in formulations suitable for a wide range of applications and can be applied to wood and other materials.

The Negative Side of Polyurethane

Although polyurethane coatings offer excellent protective properties, there are also environmental and practical considerations that need to be taken into account.

The production of polyurethane relies largely on petrochemical raw materials and can involve significant energy consumption and the use of substances that require careful environmental and occupational controls. Some polyurethane coating systems, particularly solvent-based systems, can also release volatile organic compounds (VOCs) during application and curing.

There are, however, water-based and bio-based polyurethane technologies that can reduce certain environmental impacts. Therefore, the environmental performance of a polyurethane coating depends considerably on the particular formulation, manufacturing process, and method of application.

Why We Chose Acrylic for Our Prefabricated Wooden Houses

After considering the characteristics of both acrylic and polyurethane coatings, we decided to use an appropriate exterior-grade acrylic coating system for the finishing of our prefabricated wooden houses.

Our decision is based primarily on the following considerations:

Firstly: Environmental Considerations

We prefer to use a coating system that, depending on the specific product formulation, can offer a lower-VOC and more environmentally considerate solution than conventional solvent-based polyurethane systems.

We recognize that not all acrylic coatings have the same environmental profile and that the actual environmental impact depends on the specific product and its formulation.

Secondly: Resistance to Yellowing and Colour Stability

Exterior environmental factors can contribute significantly to the discoloration and degradation of wood coatings. Ultraviolet (UV) radiation from sunlight is one of the major factors responsible for coating degradation and changes in appearance. Heat, humidity, moisture, and atmospheric pollutants can also contribute to the deterioration of coating films over time.

The wood itself is also affected by UV exposure. Light-coloured hardwoods such as Bangkirai and Camphor can undergo photodegradation, in which UV radiation affects the lignin and other components of the wood. Over time, this can alter the natural colour of the timber and produce darker, warmer, or more weathered tones.

For this reason, maintaining the original appearance of the timber requires a coating system specifically formulated for exterior UV exposure. Acrylic coatings are available with UV-resistant properties and good resistance to yellowing, helping to maintain a more stable appearance of the finished timber.

Our Conclusion

Taking these factors into consideration, we have chosen an appropriate exterior-grade acrylic coating system for our prefabricated wooden houses rather than a conventional polyurethane coating system.

Our objective is to provide a finish that combines:

  • protection of the timber;
  • good resistance to weathering and UV exposure;
  • resistance to yellowing;
  • preservation of the natural appearance of the wood; and
  • a more environmentally considerate coating solution.

For these reasons, we have decided not to use polyurethane as the standard finish for our prefabricated wooden houses and instead use an appropriate exterior-grade acrylic coating system.