When people compare sliding windows, the first thing they look at is usually the price or the look. But the numbers that actually decide whether a window will perform are the ratings: air tightness, water tightness, wind pressure resistance, thermal insulation, and sound insulation. These tell you whether the window will really keep out rain, wind, noise, and cold—year after year. For a side press window like the TS130, those ratings are especially interesting, because the design promises something unusual: the space-saving convenience of a sliding window with the sealing performance of a casement window. This guide explains what each rating means, how the TS130 is engineered to earn good results, and what to look for when comparing side press windows from any supplier.
A side press window is a hybrid design. The sash slides horizontally like a traditional sliding window, but when it reaches the closed position it presses sideways against the frame, squeezing a rubber seal along the full perimeter. That pressing action is where the name comes from, and it is also what separates the design from a standard sliding window, which usually relies on a looser overlap between sashes. The result is a window that opens without swinging into the room, yet closes with the kind of seal you would normally expect from a casement.
The TS130 side press window from ALPES is built around this principle. It uses a 6060-T66 aluminum profile at 1.8–2.0 mm thickness with a 130 mm frame wall width and a 55 mm glass sash. It is available in one-fixed-plus-one-movable or middle-fixed-plus-two-sides-movable configurations, and it can be fitted with black or grey stainless steel mesh. The combination of push-pull and swing hinges is what makes the side-press action possible: the sash slides open for a large opening, then presses shut for a tight seal.
Window performance is measured in a handful of standard categories. They are graded in levels under national test standards such as GB/T 8478 in China, and the same categories appear in one form or another in most international standards. Here is what each one actually measures:
| Rating | What it measures | Why it matters |
|---|---|---|
| Air tightness | How much air leaks through the closed window under a pressure difference | Controls drafts, dust, and energy loss; a higher level means less leakage |
| Water tightness | How well the window resists water penetration under wind-driven rain | Keeps rain out during storms; a higher level means better protection |
| Wind pressure resistance | The structural strength of the frame against wind load | Determines whether the window stays rigid in high winds or deforms |
| Thermal insulation | The heat transfer through the window, usually expressed as a U-value or K-value | A lower value means less heat loss in winter and less heat gain in summer |
| Sound insulation | How much outside noise the window blocks | Matters near roads, airports, and busy urban areas |
When a supplier publishes a rating such as "air tightness Level 6" or "water tightness Level 8," it refers to a tested result in one of these categories. The exact level a window can reach depends on the profile design, the sealing system, the hardware, and the glass—which is why two windows that look similar can perform very differently.
The TS130 does not rely on one clever part. Its performance comes from a coordinated set of design choices, each one aimed at a specific rating.
Air tightness and water tightness. The core of the TS130 is its side pressure rubber strip seal. When the sash presses shut, the strip applies uniform pressure along the entire frame, creating an airtight and watertight barrier that blocks wind, rain, dust, and noise. On top of that, the four sides are sealed with continuous rubber strips, and the upper rail frame is sealed with rubber strips as well, so there is no gap at the corners where air or rain can sneak in. This is the design detail that gives the window casement-level sealing performance while keeping the sliding opening action.
Wind pressure resistance. The frame is built from 6060-T66 aluminum profiles at 1.8–2.0 mm thickness with a 130 mm frame wall width, giving the structure the rigidity it needs to stay stable under wind load. The eight-point locking system also plays a role here: when the window is locked, the locking points distribute pressure evenly across the frame, pulling the sash tight against the seals and holding the whole assembly rigid.
Thermal insulation. The 55 mm glass sash accepts insulated glass configurations, and the airtight side-press seal prevents drafts and heat loss around the edges. A window that leaks air will lose heat no matter how good the glass is, so the sealing system is what allows the insulation to do its job.
Sound insulation. Noise enters through gaps more than through the glass itself. Because the TS130 closes with a continuous four-sided seal, it blocks the air paths that carry sound, which makes a noticeable difference in quietness compared with a loosely sealed sliding window.
A window is only as good as its hardware, and the TS130 is fitted with the complete German ROTO system for side-pressure windows and doors. The integrated sealing strips and actively controlled locking points create a pressure-resistant seal that stays reliable even in severe storms. Two hardware details are worth calling out specifically:
For projects that need more than a standard window, the TS130 also supports extended functions: an inward-opening sash mesh, integrated glass railing for balconies and terraces, an anti-theft grille, and inward or outward opening mesh options. These let the same window system adapt to different environments without changing the core sealing performance.
When you compare side press windows from different suppliers, the rating levels are the honest way to compare performance. A supplier that publishes tested ratings for air tightness, water tightness, and wind pressure resistance is giving you something concrete to compare; a supplier that only talks about how the window "looks premium" is not. Ask for the test report and check which standard it was tested under, because the same level number can mean different things under different standards.
For buyers sourcing windows for a whole project, working with a manufacturer that controls the full production chain makes the ratings easier to trust. ALPES is a China-based aluminium sliding window manufacturer with a 100,000 square meter facility across two production centers in Foshan and Zhaoqing, Guangdong. It produces 6060-T66 aluminum profiles from 1.8 mm to 2.5 mm thick and assembles the complete window, which means the profile, seals, hardware, and glass are all engineered and tested together rather than pieced together from different suppliers.
The company has delivered aluminum windows and doors for luxury villa projects in Saudi Arabia, Dubai, the Middle East, and Australia—markets with demanding climates, from desert heat to coastal wind. That project experience is a practical signal that the windows perform outside the test lab, in real weather.
The TS130 is a good fit for projects where you want a large opening and wide views without giving up sealing performance. Because the sash slides rather than swings, it works well in spaces where a casement would take up too much room—living rooms facing a terrace, poolside villas, and balconies where the view matters. The slim-framed design floods interiors with natural light, while the side-press seal keeps the space comfortable and quiet.
Before you choose, compare the ratings that matter for your climate. In a rainy coastal area, water tightness deserves the most attention. In a cold climate, thermal insulation and air tightness matter most. In a windy high-rise, wind pressure resistance is the priority. And in every case, ask for the test report rather than trusting a marketing claim. If you are comparing sliding window price across suppliers, remember that a window with higher tested ratings is usually worth more than a cheaper one that leaks air and water.
The ratings on a window are not paperwork—they are the difference between a window that looks good in a showroom and one that keeps a home dry, warm, quiet, and secure for decades. The TS130 side press window earns strong performance across air tightness, water tightness, wind pressure resistance, thermal insulation, and sound insulation through a coordinated design: a side pressure rubber strip seal, four-sided continuous sealing, a rigid 6060-T66 frame, German ROTO hardware, 200 kg pulleys, and an eight-point locking system. For architects, builders, and dealers who want a sliding window with casement-level sealing, and who want the ratings verified by a manufacturer that controls the full production chain, the TS130 is a strong candidate. Contact ALPES as an aluminum sliding window supplier to request the detailed specifications and test information for your project.
