1、 Project Background: Sealing Challenge of Vacuum Glass
Vacuum glass is formed by two parallel glass pieces passing through sealing strips and supporting columns to form a cavity. After vacuum pumping, the cavity can effectively block heat conduction and improve insulation performance.
However, due to the significant pressure difference inside and outside the vacuum chamber (up to 1 atmosphere), the sealant not only needs to have high adhesive strength and excellent weather resistance, but also needs to maintain structural stability under high and low temperature cycling, humidity, and mechanical stress.
2、 Glue requirements
According to the long-term testing requirements of the customer’s laboratory, the adhesive performance of vacuum glass frame sealing needs to meet the following standards:
reliability test
Double 85 test (85 ℃/85% RH) for 1000 hours without shedding or foaming
Cold and hot shock test: -29 ℃~+60 ℃, 252 cycles, low temperature for half an hour, high temperature for half an hour
mechanical properties
Peel strength>15 MPa (not mandatory, but requires good adhesive strength and flexibility)
sealing performance
Waterproof level needs to reach IPX8
Long term vacuum sealing stability, no air leakage, no delamination, no cracking
These conditions mean that ordinary structural adhesives or glass adhesives can no longer meet the demand, and a high-performance silicone adhesive sealing system must be used, while also considering structural adhesion, sealing protection, and thermal stress absorption.
3、 Recommended solutions
✅ Option 1: SIPA 1820 additive silicone adhesive (heat cured type)
Elaplus SIPA 1820 is a single component addition molding silicone adhesive based on a special silicone rubber system, which is cured by heating to form a flexible and weather resistant elastomer.
Performance characteristics:
High reliability: Passed rigorous tests such as dual 85, thermal shock, salt spray, and wet heat aging
Excellent weather resistance: no yellowing or cracking after long-term exposure to ultraviolet rays, moisture, and temperature changes
Excellent sealing performance: After curing, it forms a continuous elastic structure, effectively preventing water vapor and gas from penetrating
Good adhesion compatibility: stable adhesion to substrates such as glass, aluminum alloy, stainless steel, ceramics, silicone rubber, etc
Low volatile environmental protection system: non-toxic and odorless, free of solvents and by-products, meeting the requirements of green building certification
Typical applications:
Adhesive bonding between plastic shell and aluminum plate
Sealing of steam chamber for electric iron
Electric vehicle water pump seal
Motor control box CIPG
Bonding of heating elements
View Sipa 1820 details
✅ Option 2: SIPC 1859 alcohol free organic silicone adhesive sealant (room temperature curing type)
RTV N 1859 is a room temperature moisture cured neutral dealcoholized silicone sealant, suitable for applications that require high construction convenience and adaptability to low temperature environments.
Performance advantages:
Low odor, non corrosive: safe and non reactive to metals, plastics, and glass
Low volatile formula: volatile matter<500ppm, no residual atomization after curing
Excellent aging resistance: outdoor service life can reach 20~30 years
Excellent stress absorption performance: reduces stress concentration caused by mechanical and thermal shock
Ultra wide temperature stability range: -60 ℃ to 300 ℃, maintaining flexibility at high and low temperatures
Typical applications:
Household electric iron, microwave oven, induction cooker
Automotive lighting fixtures, electronic EPS power assistance, DC fans
PCB component fixing and bonding, LCM frame sealing
Engineering machinery joint sealing, control box shell CIPG/FIPG
View Sipc 1859 details
The sealing of the frame of vacuum glass is not only the key to structural protection, but also the core link to maintain long-term vacuum performance and energy-saving effects.
The Elaplus silicone adhesive sealant solution is becoming an ideal choice for the new generation of energy-saving doors, windows, and vacuum glass manufacturing enterprises due to its excellent weather resistance, reliable adhesive strength, and outstanding airtight protection performance.
Through the combined application of SIPA 1820 and SIPC 1859, both the curing efficiency of the production line and the outdoor service life can reach industry-leading levels, providing long-lasting and reliable sealing protection for vacuum glass.
Tags: Silicone sealant · Silicone adhesive sealant · Glass frame seal · Frame sealant
