Accredited Test and Research
Ublo Inc. with VS-A group conducts detailed tests and researchs relating to UBLO’s thermal performance, water and air tightness, wind pressure resistance, air ventilation and other relevant factors. Technical R&D of UBLO is always in progress.

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Air Tightness
The shield gasket with EPDM, which is compressed when operable UBLO is closed, has been designed with an optimized profile through trial and error. It can be easily opened and closed with a weak force, and the latch parts of fixed Ublo and operable Ublo are tightly coupled due to a constant elastic force. Which provides excellent airtight performance. UBLO applied the KS F2292:2019 test method to obtain a confidential first grade KOLAS result and confirmed that there was no infiltration at the highest 100Pa.

Water Tightness
Fixed UBLO that faces the glazing is designed with a delicate waterproofing and drainage system to prevent rainwater to the interior. UBLO applied the KS F 2293:2008 test and received the highest watertightness class 50 (Test pressure 500Pa).

Thermal Performance
The greatest heat loss in a building envelope occurs in windows. As the carbon emissions reduction target increases, the development of windows with improved thermal performance is becoming more important. In particular, the metal frames of windows are continuously thickening to maintain structural rigidity while adding the thermal barrier to lower heat conduction.

UBLO can be operated without frames, and it has excellent thermal performance as the part exposed to the outside does not use metal which becomes a good heat conductor. Inside the UBLO, a translucent high-performing insulation material, Aerogel, is placed or a double layer of air is placed to increase thermal performance. Based on the KS F2278:2017 test method, the heat transmission value, Uw = 1.476 W/m2K was obtained. It was conducted with a 1.5mx1.5m window set with two UBLOs installed. With thermal analysis simulation, this result was confirmed to be superior to the casement system with the same window frame and glass.




Wind Resistance
IGU, perforated with 180 mm diameter where UBLO is installed must be designed safe from strong winds outside. Structural engineering determines the glass specifications according to the perforation location and glass size.
Fixed UBLO is mounted with double sealed structures on the engineered glass, and operable UBLO is firmly fixed with the latches of fixed UBLO. To verify its safety, several computer simulations are preceded, and mock-up tests were conducted at an accredited laboratory for performance certification. The maximum pressure of 3600 Pa was tested on a 1.5mx1.5m window system by the method presented by the client referring to KS F 2296:2019 test. UBLO window set received the class 360, the highest level in this test.

Wind load resistance simulation in  3600Pa

Air Ventilation
Unlike in the past when buildings were not airtight, architectures today have sealed envelopes. Building energy use efficiency is higher as the carbon emissions reduction target increases, but it is difficult to exchange internal/external air through infiltration.
UBLO is a natural ventilation system. When the occupant determines that local ventilation is necessary, it is manually opened and closed to inflow outside air into the room.

Natural ventilation is required to reliably reduce the concentration of carbon dioxide and viruses, even in air conditioners that circulate indoor air or in rooms with mechanical ventilation where it is difficult to clean ducts and control the amount of external air. The UBLO can be selected by the occupants considering the buoyant ventilation of the height difference between the upper and lower openings. The CFD simulation of optimal ventilation conditions according to UBLO 's location can be checked in detail through the more link below. UBLO is the most reliable natural ventilation method without energy consumption.


At the general temperature in winter, condensation on the surface may occur if the product's thermal insulation performance deteriorates. According to the method of condensation prevention performance test for windows, KS F 2295, the indoor surface temperature reaches 9°C, surface condensation occurs in the given boundary conditions.

As a result of thermal analysis simulation at -10°C outside and 20°C/50%RH inside of thickness 30mm IGU with a UBLO, the surface temperature of both UBLO and glass turns out above 9°C. Therefore, there is no risk of condensation on the UBLO surface, due to the decrease in thermal performance. Moisture penetration and condensation inside the double glazing due to the destruction of the second sealant in the perforated glass are fundamentally prevented through quality control in glass production.

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