PRODUCT
WHY CHOOSE US
We combine specialized glass expertise, advanced manufacturing capabilities and strict quality control to deliver reliable glass solutions for demanding architectural, commercial and industrial applications
Dedicated expertise in vacuum glass technology and production..
Integrated processing capabilities supported by modern production equipment.
Strict quality control throughout processing and production.
Flexible specifications, technical support and dependable project service.
PRODUCT SPECIFICATIONS
APPLICATIONS
OVERVIEW
Clear Double Glazed Insulated Glass, also known as an Insulating Glass Unit (IGU), consists of two glass panes separated by a spacer and sealed around the perimeter. The cavity is filled with dry air or an inert gas to help reduce heat transfer and improve insulation.
Designed for residential, commercial and architectural applications, this product can be configured with clear, tempered, Low-E, tinted or laminated glass to meet different requirements for thermal insulation, daylight transmission, acoustic performance and safety. Spacer materials, cavity widths and glass thicknesses can be customized according to project specifications.
SHEN-SHILEI provides insulating glass solutions for window and door manufacturers, glass processors and building projects, with configurations selected to suit the intended application and performance requirements.
DETAILS
Clear Double Glazed Insulated Glass, also known as an Insulating Glass Unit (IGU), consists of two or more glass panes separated by a spacer to form a sealed cavity. The cavity is filled with dry air or an inert gas, and the perimeter is sealed to create an integrated glazing unit.
The key difference between an insulating glass unit and two separate panes of glass is its sealed cavity. A properly manufactured IGU combines a desiccant and an effective dual-seal system to help maintain a dry cavity and preserve long-term performance.
Double glazed insulated glass is widely used in residential and commercial windows, high-rise building facades, transportation glazing and refrigeration equipment. Its thermal, acoustic and optical performance depends on the glass configuration, spacer system, edge seals and cavity filling.
A typical clear double glazed insulated glass unit consists of glass panes, a spacer, desiccant, a primary butyl seal and a secondary sealant.
For more background on multi-pane glazing structures, see Wikipedia’s Insulated Glazing page.
Heat transfer through insulating glass mainly occurs through radiation, convection and conduction. The glass composition, cavity design and coating configuration all affect the overall thermal performance.
The U-value of double glazed insulated glass can vary significantly with the glass build-up, cavity width, gas filling, Low-E coating and spacer system. A range of approximately 1.6–3.4 W/(m²·K) may be encountered in certain configurations, but it should not be treated as a universal specification for all double glazed units.
Compared with single glazing, a suitable IGU can substantially reduce heat transfer. Argon filling and Low-E coatings can further improve thermal performance when correctly specified. Low-E coatings are commonly positioned on surface #2 or #3 in double glazed units, depending on the required balance of insulation, solar heat gain and daylight transmission.
Actual energy savings depend on the climate, building orientation, window frame, installation quality and building envelope. Product U-values and solar performance should therefore be evaluated using the relevant test data or calculation method.
The sealed cavity helps reduce heat transfer and can also improve sound insulation compared with single glazing. Acoustic performance depends on glass thickness, differences between the two panes, cavity width, laminated interlayers, frame design and installation.
Some configurations can achieve sound reduction in the range of 30–40 dB, but this is not a guaranteed value for every product. Traffic noise and low-frequency sound may require a specially designed glass build-up. For projects with defined acoustic requirements, the complete glazing system should be assessed using appropriate sound-insulation test data.
The desiccant and edge-seal system help keep the cavity dry and reduce the risk of condensation between the panes. A sufficiently low cavity dew point is important for preventing internal condensation and frost.
Condensation on the room-side or outdoor glass surface is a separate issue. It depends on indoor humidity, surface temperature, outdoor conditions, ventilation and the thermal performance of the complete window system. Therefore, condensation performance should be evaluated according to the intended application and environmental conditions.
Tempered glass can provide greater resistance to impact and thermal stress than comparable annealed glass. Laminated glass can help retain fragments after breakage and may be specified for applications with additional safety or security requirements.
The structural performance of an insulating glass unit depends on the pane type and thickness, unit dimensions, support conditions, wind loads and installation. Where a project requires a specific impact-resistance classification, such as EN 356 P8A, the complete specified product must be tested and certified to the relevant standard. Such ratings should not be assumed for a standard double glazed unit.
Clear glass provides high visible light transmission and maintains visual clarity. By combining clear, tinted, reflective or Low-E glass, the unit can be configured to meet different daylight, glare-control and solar-heat-gain requirements.
Visible light transmission may range from approximately 10% to 80% across different glass combinations. Solar reflectance and other optical properties also vary with the selected glass and coatings. Final values should be confirmed using product data for the specific configuration.
Clear double glazed insulated glass can be classified according to its shape, cavity filling, number of panes and glass type.
A common specification is 5+9A+5, which represents two 5 mm glass panes separated by a nominal 9 mm air cavity. In this notation, “A” indicates air. Other cavity widths, such as 6 mm and 12 mm, may be used depending on the design.
A wider cavity does not always provide better insulation. Beyond an appropriate range, increased gas movement within the cavity can reduce the expected thermal benefit. The glass build-up and cavity width should therefore be selected together according to the target performance.
The production of clear double glazed insulated glass generally involves the following stages:
Glass Cutting → Edge Processing → Washing and Drying → Spacer Preparation and Desiccant Filling → Primary Butyl Sealing → Glass Assembly → Secondary Sealing → Pressing and Inspection
Each stage contributes to the quality and durability of the finished unit.
Production tolerances, sealant dimensions and assembly times should follow the manufacturer’s validated process and the applicable product specification.
One of the most common long-term defects in insulating glass is condensation inside the cavity. This can occur when moisture enters the unit and the cavity dew point rises. Potential causes include defects in the sealant, moisture transmission through polymer materials or insufficient desiccant capacity.
Important quality-control measures include:
Relevant testing may include seal integrity, dew-point measurement, ultraviolet exposure, climate cycling and high-temperature/high-humidity testing. Dew-point testing methods and acceptance criteria vary by standard; test temperatures, exposure times and pass/fail requirements should follow the applicable procedure.
Consistent quality control helps verify that the unit meets its specified performance requirements and supports reliable service in its intended environment.
Clear double glazed insulated glass is widely used in residential and commercial buildings, including homes, offices, schools, hospitals, hotels and retail facilities. Common applications include windows, doors, curtain walls, skylights and interior partitions where the specified glazing system is suitable.
It is also used in selected transportation applications, including train, vehicle, ship and aircraft glazing, subject to the relevant industry requirements. In refrigeration equipment, insulating glass may be used in display cabinets and freezer doors to help limit heat transfer and maintain visibility.
For environments requiring controlled temperature or humidity, such as computer rooms, precision-instrument facilities, recording studios and certain industrial spaces, the appropriate glazing configuration can contribute to the overall environmental-control strategy. The full building or equipment design remains essential to achieving the required conditions.
Emerging applications include smart insulating glass that integrates technologies such as electrochromic glazing to adjust light transmission and solar control in response to electrical signals. Availability and compatibility depend on the selected system and project requirements.
The performance of clear double glazed insulated glass depends on the combined selection of glass panes, spacer type, edge-seal system and cavity filling. No single component determines the performance of the complete unit.
When selecting a configuration, consider the project’s local energy requirements, wind loads, acoustic targets, daylight needs, solar control and safety requirements. Glass thickness, cavity width, coating type and gas filling should be chosen as an integrated system.
For project-specific requirements, the selected configuration should be supported by relevant technical data, test reports and certification documents where applicable.
SHEN-SHILEI can discuss double glazed insulated glass specifications based on your project requirements. When making an inquiry, please provide the required dimensions, glass thickness and type, cavity width, performance targets, quantity and destination market. Drawings or an existing specification can also help clarify the required configuration and quotation.
FAQ
Find quick answers regarding glass customization, production lead time, technical parameters, ordering and export cooperation.
To prepare an accurate quotation, we recommend providing as much of the following information as possible:
If drawings, specifications, BOQ, or project documents are available, customers can also send them to us. Our technical team can review the requirements and recommend a suitable glass configuration before quotation.
Yes. We provide customized glass processing based on customer drawings, specifications, and application requirements.
Depending on the product, customization may include glass dimensions, thickness, glass composition, Low-E coating, spacer configuration, PVB or other interlayers, edge processing, holes, notches, corners, surface treatment, and other fabrication requirements.
For project-based orders, we recommend sending the original drawings or technical specifications before production. Our team can review the dimensions, glass configuration, processing requirements, and potential production issues to reduce the risk of errors before manufacturing.
For repeated orders, we can also maintain the approved specifications and production requirements to help ensure consistency between batches.
Both vacuum glass and insulated glass are designed to improve thermal insulation, but their structures and performance characteristics are different.
Insulated glass consists of two or more panes separated by a spacer and sealed around the perimeter, with the cavity typically filled with air or an insulating gas such as argon.
Vacuum glass uses a highly evacuated space between glass panes. Because the vacuum greatly reduces gas conduction and convection, vacuum glass can achieve high thermal insulation performance with a relatively slim overall thickness.
The appropriate solution depends on the project requirements. Insulated glass is widely used in conventional energy-efficient windows and curtain walls, while vacuum glass can be particularly useful where high thermal performance, slim thickness, retrofit compatibility, or limited glazing space is important.
For a specific project, we recommend evaluating the required U-value, window system, climate, glass size, solar-control requirements, and installation conditions before selecting the configuration.
The applicable standards and documentation depend on the product, destination market, and project requirements.
Before production, customers can specify the required standards or provide the project specification. We can then confirm the applicable technical requirements and documentation.
Depending on the product and project, documentation may include product specifications, inspection records, test reports, certificates, material information, and other quality documents.
For export projects, we recommend confirming the required standards during the quotation stage rather than after production. This allows both sides to verify whether the proposed glass configuration meets the technical requirements of the destination market.
Quality control begins before production and continues throughout the manufacturing process.
Depending on the product, quality control may cover raw material inspection, dimensional accuracy, glass appearance, edge quality, processing accuracy, tempering performance, coating condition, insulating glass sealing, laminated glass bonding, and final product inspection.
For customized and project orders, production specifications are confirmed before manufacturing. Critical dimensions and processing requirements are checked during production, followed by final inspection before packing.
We also recommend that customers confirm critical acceptance criteria in advance, especially for large architectural projects. This creates a clear quality standard for both sides and helps ensure consistent production and inspection.
Our MOQ depends on the glass type, dimensions, processing requirements, production setup, and order structure.
Standard-size products and larger project orders may have different MOQ requirements from highly customized or small-batch products.
For project orders, we recommend sending the glass schedule or estimated quantity first. We can evaluate the order based on the actual specifications rather than applying a single MOQ to all products.
For new customers or sample development, we can also discuss a suitable trial quantity depending on the product and processing requirements.
Lead time depends on the product, quantity, specifications, processing complexity, raw material availability, and current production schedule.
Standard products with confirmed specifications generally have a shorter production cycle, while customized glass, large project orders, special processing, or products requiring specific materials may require additional time.
Before order confirmation, we provide an estimated production schedule based on the actual order requirements. For project orders, we recommend confirming the required delivery date during the quotation stage so that production capacity and shipping arrangements can be planned in advance.
Glass packaging is designed according to the product type, glass dimensions, weight, transportation method, and destination.
For export shipments, glass is normally secured in suitable transport crates or cases with protective materials to reduce movement, impact, scratching, and other transportation risks.
For large or heavy glass units, packaging and loading arrangements are planned according to the actual dimensions and weight of the shipment.
Before shipment, the packing condition and loading arrangement are checked to help ensure that the glass is properly secured during transportation.
For long-distance sea shipments, we also recommend confirming the packaging and loading requirements according to the destination port and transportation conditions.
Yes. Sample production can be discussed for many customized glass products.
For project orders, samples can be used to confirm important aspects such as appearance, color, glass configuration, thickness, processing details, and overall workmanship before mass production.
If the project requires laboratory testing or third-party certification, the required test method and acceptance criteria should be confirmed before sample production.
Once the sample and technical specifications are approved, the approved configuration can be used as the reference for subsequent bulk production.
Yes. We can review the project requirements and recommend a suitable glass configuration based on the intended application.
Customers do not necessarily need to determine the complete glass structure before contacting us. You can provide the application, glass dimensions, required performance, local climate, building or product requirements, and any available drawings or specifications.
Based on these requirements, we can evaluate suitable options such as vacuum glass, insulated glass, laminated glass, tempered glass, or combinations of different glass types.
For example, if the priority is thermal insulation with limited glazing thickness, vacuum glass may be worth evaluating. If the project requires thermal insulation together with solar control or acoustic performance, an appropriate insulated glass configuration may be considered. Where safety or security is a key requirement, laminated or specially designed glass constructions may be more appropriate.
The final specification should always be determined according to the applicable project standards, system requirements, testing requirements, and actual installation conditions.
Send the dimensions, quantity, application and destination for a project review.
