Thickness

If the door core is made of glass or a silver mirror, it is typically 5mm thick. However, if a wooden core is used, 10mm thickness is recommended for better stability. Some manufacturers use thinner wood boards (such as 8mm or even 6mm) to cut costs. Unfortunately, this can lead to instability, warping, and deformation over time. Thin boards may also cause the sliding tracks to become unsmooth, leading to poor performance and inconvenience in daily use.

Paint Surface

The paint finish on high-quality sliding doors is usually applied in two layers—first removing dust and impurities, then applying the top coat. This process ensures strong adhesion and prevents peeling. In contrast, some small manufacturers only do a simple baking process, or even skip it entirely, resulting in poor paint quality, uneven texture, and easy chipping. High-end manufacturers like Sophia, Ocean Gate, Nature Doors and Windows, and Top Solid invest in advanced technology and in-house processing to ensure a smooth, even, and long-lasting finish.

Surface Quality

Many large sliding door manufacturers handle the surface treatment themselves using imported technologies, ensuring a high-quality, consistent finish. On the other hand, smaller companies often purchase pre-colored profiles from third-party factories, which limits their ability to customize or match colors properly. If the profile gets scratched during transport or installation, the color mismatch can be very noticeable. This is why reputable brands pay close attention to every detail in the painting process to maintain quality and aesthetics.

Material of the Board

Most sliding doors are made from wood-based panels such as fiberboard or particleboard, which contain adhesives that release harmful substances like formaldehyde. Many low-quality manufacturers use inferior materials with excessive formaldehyde levels, which can pollute indoor air and pose health risks. This is especially concerning in colder regions where windows are often closed, increasing exposure. Choosing a reliable brand with high-quality materials is essential for both safety and comfort.

Pulley Material

The pulley system is one of the most critical components of a sliding door. There are three main types: plastic, metal, and carbon fiber with roller bearings. Metal pulleys are durable but can create noise when sliding. Carbon fiber pulleys with bearings offer smooth, quiet movement and are more resistant to wear. Their enclosed design helps prevent dust buildup, making them ideal for dusty environments. Some low-quality doors use organic plastic wheels that wear out quickly, causing uneven movement and difficulty in sliding. Poorly designed pulleys may lack anti-jump mechanisms, leading to potential derailment and safety issues.

Warranty and After-Sales Service

Some less reputable manufacturers make promises about warranty periods during sales but fail to deliver proper after-sales support when problems arise. This can result in delays, excuses, or even no service at all. To avoid such issues, consumers should research the manufacturer’s reputation and ask for a warranty card after installation. Sliding doors are expensive and long-term investments, so choosing a trustworthy brand with a solid warranty is crucial for peace of mind.

Style and Design

Sliding doors come in various styles depending on regional preferences. Northern designs tend to feature thicker aluminum frames and a more stable, traditional look, often incorporating grid patterns with a distinctive "Tanger" element. Southern styles, on the other hand, are more diverse, with popular options like floral glass, ice sculpture, shallow carving, and crystal shell effects. These styles reflect local tastes and add visual appeal to modern homes.

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