Featured Product
Battery End Seals
Introducing our glass to metal seal battery terminal, the key for your battery to withstand harsh environments, including extreme temperatures and corrosive conditions. Less likely to fail compared to other sealing methods, they are suitable for critical applications like smart meters for wtater, electricity, and gas, measuring instruments, medical devices, and positioning systems in aerospace. Extend the life of your battery and protect against leakage and contamination with our seals.
Compressor Terminals
Engineered with state-of-the-art glass-to-metal sealing technology, our terminals are designed with high resistance of 100 gigaohms, withstand up to 3700V without electrical breakdown, and feature exceptional mechanical strength, consistent product performance, and excellent cost-effectiveness, all in a compact and efficient design optimized for space-saving without compromising on performance.
What to Look for in Hermetic Seal
The technical performance of glass to metal hermetic seals varies across industries and applications. While we offer customized sealing solutions specific to your requirements and needs, some of the key indicators include:

Hermetic Seal

Helium leak below 1*10-9 Pa·m3/s, effective shielding from moisture and gas infiltration.

Chemical Stability

Robust resistance to a wide range of strong acids and bases (excluding hydrofluoric acid, with exceptional water resistance at Level II.


Engineered for durability, it withstands harsh outdoor conditions, resisting extreme sunlight and temperature fluctuations without material degradation.

Voltage Endurance

Designed to endure up to 3500V, ensuring reliable performance and safety in high-voltage applications like refrigeration compressor terminals.

High Insulation

Outstanding insulation with resistance over 100,000 MΩ at 500V, providing enhanced safety and electrical performance in critical applications.

High Mechanical Performance

Optimized for high-stress environments, it withstands over 30 MPa water pressure, ideal for petroleum pipeline and pressure vessel windows.
What Are Glass to
Metal Seals?
Glass-to-metal seals are specialized components where glass is expertly fused with metal, creating an impermeable bond. Essential in electronics and automotive industries, these seals offer robust insulation and protection against environmental factors, ensuring reliability and performance in critical applications.
Types of Glass-to-
Metal Seals
Matched Seal: Involves using glass and metal with similar coefficients of thermal expansion. This ensures that both materials expand and contract at similar rates, reducing stress and preventing cracking.
Compression Seal: Uses glass with a lower coefficient of thermal expansion than the metal. When cooled, the metal contracts more than the glass, creating a high-pressure seal around the metal.
Choose Sinopride:
A Premium Glass Preform Manufacturer from China
We are a premier hermetic sealing glass manufacturer in China specializing in the research and production of high-quality sealing glass powder and related products and solutions. Our goal is to protect critical components from moisture, dust, thermal variations, and shocks for optimal performance and longevity in demanding applications. Choose us for our shared commitment to delivering products that embody precision, durability, and unparalleled quality.
Years of Experience
Members of QC Team
Members of R&D Team
Annual Production in Tonnes
Patents Granted
Glass to Metal Seal Design Guide and Process
01. What is a Glass to Metal Seal?

A glass to metal seal is a critical component used in various industries to create a hermetic seal between glass and metal parts. This technology ensures airtight sealing, which is essential in environments where preventing gas or liquid leaks is crucial.

02. How are Glass to Metal Seals Manufactured?

Glass to metal seal manufacturers employ specialized processes involving the careful selection of metal and glass materials, ensuring compatibility and thermal expansion rates. The process typically involves melting the glass into a metal component, creating a bond that seals upon cooling.

03. What are the Common Applications of Glass to Metal Seals?

Glass to metal seals are widely used in electronics for hermetic connectors, in aerospace for pressure-tight windows, and in medical devices for implantable components. Their ability to maintain integrity under extreme conditions makes them ideal for these applications.

04. What is Sealing Glass and How is it Used?

Sealing glass is a specific type of glass formulated to bond with metals. It's used in creating glass to metal seals due to its thermal expansion properties, which closely match those of the metal, ensuring a durable and robust seal.

05. What are the Benefits of Hermetic Sealing in Glass to Metal Seals?

Hermetic sealing in glass to metal seals offers numerous benefits, including protection against moisture and contaminants, preservation of vacuum or pressure conditions, and enhanced durability and reliability in harsh environments.

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