High bonding strength SHS prepreg is an upgraded variant of standard SHS prepreg with enhanced adhesion performance. While standard SHS prepreg prioritizes structural strength, the high bonding strength version optimizes resin formula and resin content to significantly boost interfacial adhesion between glass fiber cloth and dissimilar materials including metals and insulation paper, while retaining the high-strength advantages of glass fiber cloth substrates. It serves as a superior solution for application scenarios requiring both structural strength and robust bonding force such as transformer coil fixation and copper foil-insulation layer bonding, delivering insulation, reinforcement and bonding functions simultaneously through a single thermal compression process.
By optimizing the epoxy resin formula with added tougheners and coupling agents, we substantially improve resin wettability and adhesion to glass fiber cloth and bonded substrates. Actual test data shows that the peel strength between the high bonding strength version and copper foil exceeds the standard SHS by over 35%, with bonding force attenuation below 10% after 50 hot and cold cycles versus 25% attenuation for the standard variant. A large dry-type transformer manufacturer previously used standard SHS prepreg for copper foil fixation, where large current-induced temperature fluctuations caused edge warping after prolonged operation. After switching to our high bonding strength SHS prepreg, bonding reliability improved drastically with no debonding observed after over one year of operation. For distributors, the high-adhesion variant enables you to secure large clients with stringent reliability requirements.
Specification Parameters
|
Parameter Item |
Technical Index |
|
Finished Thickness |
0.1～0.5mm |
|
Maximum Width |
1600mm |
|
Temperature Resistance Class |
Class H (180℃) |
|
Copper Foil Peel Strength |
≥8N/cm |
|
Bending Strength |
≥420MPa |
|
Bonding Retention Rate after Hot & Cold Cycles |
≥90% |
Application Fields
- Copper foil fixation and insulation of dry-type transformers
- End reinforcement and bonding of transformer coils
- Insulation cladding and bonding of high-current busbars
- Interlayer reinforcement and bonding of reactor coils
- Insulation structures requiring high bonding reliability
Factory Strength
Our factory boasts a complete independent R&D and production system for prepreg, with proprietary technical accumulation spanning formula development to coating processes. High bonding strength SHS prepreg imposes elevated requirements on resin formulas and coating processes: resin must fully infiltrate every fiber of glass fiber cloth without excessive dripping, a balance mastered through decades of experience by our technical lead with over 20 years of insulation material R&D experience, who led breakthroughs on multiple formula challenges. The factory is equipped with high-precision coating production lines, 4 slitting machines and stamping forming equipment with an annual capacity of 1,000 tons to stabilize large order supply. Products are exported to South America, Southeast Asia, the Middle East and other regions, building a solid reputation in overseas markets.
Customization Capabilities
High bonding strength SHS prepreg offers extensive customization options. Multiple glass fiber cloth specifications are available from lightweight to heavyweight grades matched to your strength requirements. Resin content is adjustable: higher content for enhanced adhesion or lower content for ultra-thin applications. Curing speed is also customizable: fast-curing variants complete curing in only 20 minutes at 150℃ for high-efficiency production lines, while slow-curing variants offer extended operation windows for complex processes. Width ranges from narrow strips to 1600mm full width, and we can cut sheets or stamp special-shaped parts as requested. OEM labeling is fully supported with packaging and labels customized to your specifications. The minimum order quantity is 500 kg, and free samples are available for testing.
After-sales Service
We provide dedicated technical support for the high bonding strength series. Pre-sales engineers thoroughly assess your working conditions, bonded material types and curing processes to confirm the optimal model and parameters. We maintain full follow-up during sample testing with timely formula adjustments as needed. After bulk supply commencement, we conduct regular follow-up visits to monitor real-world performance on your production lines and assist curing parameter optimization to reduce reject rates. During production, we proactively share manufacturing progress photos and videos without follow-up reminders required. We respond within 8 hours and deliver solutions within 24 hours for any issues, assigning technical personnel for on-site coordination for complex problems.
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