What is a Solid Surface Bathtub? And what is the Difference to Acrylic Tubs?

Did you know modern bathtubs, solid or acrylic, provide a 100% non-porous surface? This makes them highly resistant to bacteria and moisture. Although they share many similarities, solid-surface and acrylic bathtubs have different manufacturing techniques, densities, thermal conductivity, appearance, and repairability. Their properties set them apart, and understanding these differences will help you decide which is more suitable for your application.

There is a rising trend in solid-surface bathtubs owing to their luxurious and premium feel. They mainly target the mid- to high-end market. The higher price tag of solid-surface bathtubs has long-term benefits, making them a superior selection against acrylic tubs. This article will discuss solid-surface bathtubs and explain their differences from acrylic tubs. Let's begin!

1. What is a Solid Surface Bathtub?

Solid surface material was invented by DuPont biochemist Don Slocum and patented in 1968. In its earliest form, it was only available in white. As the patent was nearing its expiration date in 1987, other manufacturers introduced various colors, bringing variety to the solid surface material.

With time, manufacturers have found a way to mold solid-surface material into the shape of a bathtub. Today, solid-surface bathtubs can mimic natural stones like granite and marble, making them indistinguishable from their natural material counterparts.

1.1 Composition and Material Technology

A solid-surface bathtub combines resin and natural minerals like aluminum trihydrate (ATH), quartz, or marble dust. The earliest form used ATH, which gave it the distinct white color. The formation of a bathtub shape requires the following steps:

• Forming a mixture of resin and natural minerals
• Pouring the mix into premade molds
• Allowing the material to cure inside the mold in a specific temperature and humidity-controlled environment.
• Performing sanding and polishing the surface to create a smooth, refined finish.

1.2 Common Finishes

The finish of the solid-surface bathtub depends on the abrasive used for sanding down the surface. Standard finishes include matte or satin.

For the matte finish, manufacturers use coarse-grit sandpaper, whereas for the satin finish, finer grit is used and buffing is performed to give the surface a polished look. There is no coating or painting on the solid surface material. Here are the details of the material used for creating the surface finishes on solid surface material:

• Matte Finish: Use 400–600 grit or maroon pad.
• Satin Finish: Finer grits (800–1500) or gray pads, possibly followed by a polishing cream.

2. Solid Surface Freestanding Tub: A Popular Modern Choice

Solid-surface bathtubs are the primary choice of modern home interiors. Their exquisite design makes them the focal point of the bathroom. Their sculptural form invokes a feeling of luxury and a spa-like treatment. Compared to the utilitarian designs of drop-in bathtubs, solid-surface freestanding bathtubs result in a more mindful bathing experience. The user bathes to unwind, relax, and practice self-care.

Solid surface materials provide aesthetics similar to stone but exhibit excellent properties, such as a non-porous surface and low heat conduction. It can prolong the bathing experience while adding character to the bathroom through its contemporary looks.

3. Solid Surface Bathtub vs Acrylic Tub: Key Differences

3.1 Material and Construction

As discussed earlier, a solid-surface bathtub is made with a resin and natural material mix such as marble or quartz. Alumina trihydrate (ATH) is the standard resin used in this formation. ATH is non-toxic, halogen-free, chemically inert, and low-abrasive. The composition is usually 33% resin and 66% natural minerals. The construction is robust, and the bathtub retains its shape efficiently.

In comparison, acrylic tubs are made using the thermoforming process on sheets. Later, the tub is reinforced using fiberglass. This layered construction adds to the strength of the acrylic material. However, acrylic still has some flexibility compared to the solid, stone-like feel of a solid-surface bathtub.

3.2 Durability and Scratch Resistance

Any material's durability requires careful evaluation of its performance under various stress and environmental conditions. Moreover, resistance to scratch, abrasion, tear, and dimensional changes also indicates its durability.

The density of solid surface material is around 1.17g/cm³, whereas acrylic has a density of 1.7g/cm³. Higher density generally means better durability. Acrylic material is generally harder and offers better resistance to minor scratches. However, its visibility on glossy-finish acrylic is higher. In comparison, minor scratches on solid-surface bathtubs have lower visibility, and deeper scratches can be easily buffed out.

3.3 Heat Retention and Bathing Comfort

The heat conductivity of acrylic is around 0.17 W/(m·K) while the solid surface material conductivity is lower at around 0.15 W/(m·K). The typical composition of solid surface material allows it to hold heat for extended periods. The lower heat conductivity translates to a longer and comfortable bathing experience. A solid surface bathtub can retain heat for at least 30 minutes to an hour. The result is a more spa-like experience with a bathtub.

3.4 Size and Shape Options

The manufacturing technique of solid-surface bathtubs allows them to have unique designs and will enable designers to be creative. In comparison, acrylics depend on the mold limitations of the vacuum forming process. An acrylic sheet is heated, and then a vacuum sucks the sheet to a mold and allows it to cool to retain shape. The process restricts the depth of draw and the complexity of edges. Molding of solid-surface bathtubs allows unique sculptural forms that are impossible with the acrylic bathtub process.

3.5 Maintenance and Cleaning

We can compare solid-surface and acrylic bathtubs regarding shape retention, repairability, and cleaning methods. Solid-surface bathtubs provide excellent resistance against scratches and indentations. Users can sand down the surface using 1500-grit sandpaper, leaving the surface smooth. For a glossy finish, users can buff it out. Acrylic will require a similar technique, but achieving a smooth surface is harder.

Cleaning solid-surface bathtubs is easier owing to their tolerance against diluted bleach and abrasive cleaners. In comparison, acrylic requires gentler cleaners. Moreover, the shape retention property of solid-surface bathtubs is exceptional compared to acrylics, which can deform at high temperatures.

3.6 Weight and Installation

Solid-surface bathtubs are heavier than their acrylic counterparts. Their density makes them heavier, which increases their maneuverability. Acrylic tubs are also easier to install plumbing work for, as they are easy to move. However, both require floor leveling to ensure that the bathtubs are not misaligned, which may cause them to deform or break with time.

3.7 Cost and Value

Understanding price tags can be tricky when combining acrylic with solid surface bathtubs. Value for money is a vital aspect to consider when purchasing non-consumable items. Here are the details of both types of bathtubs:

Acrylic Bathtubs:

 * Basic: $300 - $600

 * Mid-Range: $600 - $1,200

 * Luxury: $1,200 - $3,000+

 * Typical Lifespan: Generally 10 to 15 years

Solid Surface Bathtubs:

 * Basic: $1,500 - $2,500

 * Mid-Range: $2,500 - $4,000

 * Luxury: $4,000 - $8,000+

 * Typical Lifespan: Often lasts 20 to 30 years

If we look at the lifespan and cost of the bathtub, we can see that solid-surface bathtubs offer more value than acrylic bathtubs.

4. Applications and Ideal Settings for Solid Surface Tubs

Luxury and solid surface bathtubs are closely tied. They are best suited for a bathroom with a contemporary interior design. Spaces that require a visually striking piece can utilize solid surface tubs to bring in a serene feeling of a spa. Here are applications of solid surface tubs:

4.1 Residential: Prioritizing Longevity

For homeowners, solid-surface bathtubs provide the longevity they may require for cost savings. Their maintenance and cleaning features allow homeowners to avoid frequent part or tub replacement. They can last as long as the house, with a typical life of over 20 years. The porous surface and material characteristics offer mold resistance and ease of cleaning. They can withstand daily rigorous use, minor scratches, and damage.

4.2 Hospitality: Premium and High-End Aesthetics

A solid surface bathtub provides the necessary characteristics for luxury hotels, upscale farmhouses, resorts, spas, and exclusive boutiques. They mimic a stone-like physical feel that speaks premium and high-end. The weight of the bathtub allows for firm sitting and support for users with more weight. In contrast, acrylics can bend under heavy loads and high heat, affecting user experience. Owners of hospitality establishments need to leave a long-lasting impression on the guest, and solid surface bathtubs are the best way to display commitment to quality, luxury, and attention to detail, thus encouraging revisits.

4.3 Luxury Homes: Opulence and Design Sophistication

Luxury homes are all about having the best, and there is no doubt that solid-surface bathtubs are the best for the ultimate bathing experience. Their heat-retention capability makes them ideal for relaxation. However, they need some real estate to exhibit their luxurious aesthetic fully. The solid-surface bathtub will act as a centerpiece in a spacious setting, attracting all the attention.

5. Conclusion: Which Bathtub Should You Choose?

Selecting the right bathtub means carefully evaluating one's requirements. Solid-surface and acrylic bathtubs offer their advantages and disadvantages. Solid-surface bathtubs are excellent as a long-term luxurious investment. Acrylic is ideal for cost-effective and function-only preferences. Solid surface bathtubs are easy to maintain and repair in case of damage. In comparison, acrylic can have scratches that will become prominent, and deep scratches are hard to fix. On the other hand, Solid-surface bathtubs are great for heat retention and have unique designs. A freestanding unit inside a large bathroom will make an unforgettable statement.

If you want mid-range to high-end solid-surface bathtubs, consider KKR (Kingkonree) as your supplier. KKR (KingKonree) offers an extensive selection of over 150 solid-surface bathtub molds, which is expanding. Moreover, KKR offers a custom mold. Users can design a solid-surface bathtub, and KKR will supply them with its excellent supply chain network. They also have an extensive manufacturing facility that spans 15,000 sqm in area. Visit the KKR website for a comprehensive one-stop solution for your solid-surface bathtub.

6. FAQs

Q1: Are solid surface bathtubs easy to clean and maintain?

Cleaning and maintaining solid-surface bathtubs is easier than with any other porous counterpart material. Their non-porous surface resists mold formation and moisture. All you need is a clean cloth, warm water, and mild soap in case of stubborn stains. The surface is also easy to repair and requires simple sanding and buffing for renewal.

Q2: Are solid surface bathtubs eco-friendly?

Solid-surface bathtubs are long-lasting and can last 25+ years with care. Manufacturers may use recycled material as raw material. Many solid-surface tubs use low-VOC resins and are durable, reducing waste. Plastic-based tubs' solid surface is a more environmentally responsible option.

Q3: Can solid-surface bathtubs be repaired if they are damaged?

Yes, repairing solid-surface bathtubs is convenient. All it requires is sanding and buffing, which will result in a new scratchless surface. A professional can also repair the deeper damage without replacing it.

Q4: Are solid-surface bathtubs prone to staining or scratching?

Regular care of a solid-surface bathtub will result in long-lasting performance. The chances of staining on solid-surface material are unlikely as they are non-porous in nature. However, some watermarks might stay on the surface, which can easily be cleaned with light soap. Moreover, solid-surface tubs are resistant to light scratching, but their repairability helps maintain the pristine, stone-like finish for years.