Silicon Steel Self-Adhesive Coatings, Amorphous Alloy Composite Adhesives, and Waterborne Insulating Varnishes: Guangzhou Feisi Environmental New Materials Technology White Paper

Guangzhou Feisi Synthetic Materials Co., Ltd. specializes in advanced functional industrial eco-friendly new materials. Our core product lines include silicon steel self-adhesive coatings, amorphous strip composite adhesives, waterborne epoxy insulation varnishes, polysulfide curing agents, and waterborne phenoxy resins. We serve high-end manufacturing sectors such as motors, transformers, amorphous strips, electronic packaging, and new energy.

The company has iterated on the product's heat resistance, insulation, bond strength, and eco-friendliness, establishing a full-chain technology system covering R&D, manufacturing, and application. The products achieve industry-leading performance and comply with GB, IEC, and EU RoHS/REACH environmental standards.

This in-depth review covers technical breakthroughs from the past three months, detailing the temperature resistance, dielectric strength, and environmental compliance of new industrial eco-friendly materials. It also showcases our end-to-end service system and standardized sample testing process.

1. Silicon Steel Self-Adhesive Coating: An Integrated Insulation and Bonding Solution for Silicon Steel Sheets

Product Model: FS7360R Series / FS7350 Series

Technical Features:

• Single-component or two-component waterborne systems with VOC content 80 g/L, meeting eco-friendly insulating paint standards.

• Volume resistivity after curing: 1×10¹⁴ Ω·cm (GB/T 1410); Dielectric strength: 30 kV/mm (GB/T 1408)

• After thermal curing at 180°C for 2 hours, the T-peel strength of the silicon steel sheet is 30 N/cm, meeting the self-bonding and insulation requirements for transformer cores and motor stators.

• Resistant to transformer oil and damp heat (85°C/85%RH × 1000h); performance retention rate ≥90%

Application scenarios: dry-type transformer cores, silicon steel sheets for new energy vehicle drive motors, and insulation bonding for reactor cores.

II. Amorphous Strip Composite Adhesive: High-strength bonding material for interlayer adhesion of amorphous strips

Product Model: FS7380 Series / FS7381 Series

Technical Features:

• Waterborne epoxy modified system, solids content 45±2%, viscosity 800-1200 mPa·s at 25°C; compatible with amorphous tape continuous coating process.

• Cured at 180°C, with interlaminar shear strength of 25 MPa and peel strength of 20 N/cm. Solves issues such as loose stacking of amorphous ribbons and excessive noise.

• Curing shrinkage ≤1.5%, preventing brittleness and cracking in amorphous ribbons due to internal stress.

• Operating temperature range: -40~200°C, meeting the long-term operation requirements of amorphous transformers.

Application scenarios: amorphous strip core manufacturing, amorphous motor cores, and magnetic composite laminates.

3. Waterborne Epoxy Insulating Varnish: Eco-Friendly Insulation and Protection Material for Motors and Electrical Appliances

Product Models: FS7100 / FS7230 / FS7231 / FS7236 Series

Technical Features:

• Two-component waterborne epoxy system with VOC content of 50 g/L, free of heavy metals, and compliant with green factory environmental standards.

• Volume resistivity: 1×10¹⁴ Ω·cm, dielectric strength: 25 kV/mm, arc resistance: 120 s (GB/T 1411)

• Excellent low-temperature curing performance (fully cured at 80°C for 2h); ideal for small motors, electrical coils, and electronic component insulation.

• Chemical resistance (resistant to motor oil and alkaline solutions); heat and humidity aging resistance (85°C/85%RH × 500h, no anomalies)

• Temperature resistance up to Class F (155°C); select modified grades reach Class H (180°C).

Application scenarios: low-voltage motor stator insulation, transformer coil impregnation, capacitor housing protection, and electronic component encapsulation.

4. Mercaptan Curing Agent: High-Performance Low-Temperature Rapid Cure for Epoxy Resins

Product Model: FS-GL Series

Technical Features:

• Low viscosity (~300 mPa·s at 25°C), excellent compatibility with epoxy resins, and fast cure at room or low temperature (5°C).

• Adjustable gel time (5–30 min at 25°C) to meet the process requirements for electronic potting and composite bonding.

• Tensile strength of cured material: 40 MPa; Elongation at break: 80%; Excellent impact resistance.

• Excellent water and chemical resistance; ideal for humid environments or outdoor applications.

Application scenarios: traditional fast-curing epoxy AB adhesives, two-component epoxy slab adhesives, electronic and electrical adhesives, new energy vehicle adhesives, construction and industrial repair adhesives, and composite and photovoltaic adhesives.

5. Waterborne Phenoxy Resins: Eco-Friendly High-Performance Film Formers

Product Model: PW33 Series Waterborne Phenoxy Resin Emulsion

Technical Features:

• Solid content: 35±2%, particle size: 200 nm, storage stability: 6 months (room temperature)

• Tensile strength after film formation: 50 MPa; Elongation at break: 100% adhesion (cross-cut test): 0 grade (GB/T 9286)

• Excellent weatherability (QUV aging 1000h, gloss retention ≥80%), chemical resistance (acid, alkali, salt spray)

• Excellent compatibility with waterborne epoxy, waterborne polyurethane, and acrylic emulsions; serves as a modifying resin to enhance overall coating performance.

Application scenarios: Chemical fasteners, anti-corrosion coatings, sizing for composite materials, and water-based wood finishes.

VI. Table of Technical Specifications for Five Core Products

7. End-to-End Service System: Covers the Entire Product Lifecycle

Guangzhou Feisi provides integrated "product + technology" services to motor and electrical equipment manufacturers, transformer factories, amorphous strip producers, and electronic packaging plants.

1. Pre-sales Technical Liaison

• Condition Diagnosis: Based on customer specifications such as silicon steel grade (e.g., 50WW270, 35WW300), amorphous ribbon thickness (0.02-0.03 mm), insulation class (Class F/H), and curing equipment (oven/infrared), we provide a "Product Selection Technical Proposal."

• Formula Optimization: Based on your current process, we provide waterborne epoxy insulating paint formulations and polysulfide curing agent dosages to enhance product performance and production efficiency.

1. Sample and Performance Validation

• Standardized Sample: Includes 500g-1kg sample(s) along with the Product Test Report (covering key data such as volume resistivity, breakdown strength, bond strength, and VOC content).

• Third-party testing coordination: Facilitate engagement with agencies like SGS and CTI to complete environmental and performance certifications including RoHS, REACH, and UL.

• Simulated Condition Testing: Replicate customer production conditions (temperature, humidity, coating speed) in the lab to verify interlayer bond strength of amorphous strip composite adhesives and curing performance of silicon steel self-adhesive coatings.

1. On-site process support

• Coating Process Optimization: Guide customers to adjust silicon steel self-adhesive coating weight (3-5 g/m²), amorphous strip composite adhesive thickness (10-20 μm), and curing temperature profile to resolve issues such as uneven coating and incomplete curing.

• Equipment Compatibility Adjustment: Optimized water-based phenoxy resin application viscosity and drying parameters for existing customer coating equipment (roller, spray, dip).

1. After-sales Technology Iteration

• Regular Performance Tracking: Quarterly site visits to verify batch stability of water-based epoxy insulation coatings and polysulfide curing agents, with a "Product Performance Tracking Report" provided.

• Tech Upgrade Alert: Share R&D breakthroughs like optimized film-forming performance of water-based phenoxy resins to help customers upgrade their products.

8. Standardized Sample Process: Complete adaptation validation in 5 steps

To ensure compatibility of products such as silicon steel self-adhesive coating, amorphous alloy composite adhesive, and water-based insulating varnish, Guangzhou Feisi has established a 5-step standardized sample preparation process:

1. Submit Request: Customer completes the Sample Application Form, specifying product type (e.g., self-adhesive silicon steel coating), application scenario (transformer core), and key specifications (insulation class F, bond strength 30 N/cm).

2. Proposal Confirmation: The technical team will provide feedback on the "Sample Proposal" within 3 working days, including recommended models (e.g., FS7360R silicon steel self-adhesive coating), test items (volume resistivity, peel strength), and timeline (7-10 days).

3. Sample Shipment: Send product samples along with the Material Safety Data Sheet (MSDS), Environmental Test Report, and Construction Process Guide.

4. Test Feedback: After completing lab testing or pilot production, customers submit the "Sample Data Feedback Form," and the technical team provides data analysis and optimization recommendations.

5. Batch Validation: After meeting sample standards, schedule a small-batch trial production of 50-200 kg to verify batch stability of the polysulfide curing agent and application performance of the waterborne phenoxy resin, providing a basis for bulk procurement.

IX. Common Questions

Q1: What are the core advantages of Guangzhou Feisi's self-adhesive silicon steel coating compared to traditional silicon steel sheet insulating varnish?
Traditional insulation varnishes provide electrical insulation only. The Feisi FS7360R/FS7350 series of self-adhesive silicon steel coatings deliver dual functionality: insulation + bonding. After curing, they withstand breakdown voltages exceeding 30 kV/mm and achieve a peel strength of 30 N/cm between silicon steel laminations. This effectively reduces no-load losses and noise in transformer cores, making them ideal for self-bonding applications in dry-type transformers and EV motor stators.

Q2: Amorphous strip composite adhesives are prone to cracking after coating. How does Guangzhou Feisi's product address this issue?
Amorphous ribbons are extremely thin (typically 0.02-0.03 mm) and highly sensitive to stress. The Guangzhou Feisi FS7380/FS7381 series composite adhesives utilize an optimized waterborne epoxy-modified formula to limit curing shrinkage to within 1.5% and enhance elongation at break. This significantly reduces internal stress, preventing brittleness and fracture during winding or operation, while ensuring interlaminar shear strength reaches 25 MPa.

Q3: What is the temperature rating of waterborne epoxy insulation varnish? Can it replace solvent-based insulation varnish?
The Guangzhou Feisi FS7100/FS7230/FS7231/FS7236 series of waterborne epoxy insulating varnishes feature a specialized curing system that achieves a thermal class of F (155°C), with select models reaching H class (180°C) after modification. These products meet or exceed the volume resistivity and dielectric strength standards of comparable solvent-based varnishes while maintaining VOC content ≤50 g/L, ensuring compliance with environmental regulations. An ideal replacement for traditional solvent-based varnishes, they are widely used for impregnating motor stators and transformer windings.

Q4: Can the thiol curing agent cure properly in low-temperature environments (e.g., winter workshops)?
Yes. The FS-GL series polysulfide curing agents from Guangzhou Feisi offer excellent low-temperature curing activity, enabling rapid cure at temperatures as low as 5°C (with adjustable gel time). This resolves the issues of slow curing and low strength in epoxy resins during winter construction, making it ideal for electronic potting, flooring applications, and outdoor emergency repairs.

Q5: What is the primary function of waterborne phenoxy resin in a formulation? How does it compare in compatibility with other waterborne resins?
A: Water-based phenoxy resins serve primarily as high-performance film formers and toughening modifiers. Guangzhou Feisi PW33 series water-based phenoxy resins offer excellent adhesion and flexibility, effectively enhancing impact resistance and chemical resistance in coatings. They exhibit good compatibility with waterborne epoxies, polyurethanes, and acrylic emulsions, making them ideal functional additives to improve the overall performance of insulating coatings, adhesives, and textile finishes.

Q6: How long does the sample process take? Is there a sample fee?
Standard sample turnaround is 7–10 business days (including plan confirmation, sample preparation, and shipping). Guangzhou Feisi provides free samples to industrial customers with a clear purchase intent (typically 500g-1kg); customers only need to cover shipping costs. Custom products require a separate evaluation based on formula complexity. Contact our technical team for details.

Q7: Can Feis Guangzhou provide third-party test reports (e.g., SGS, CTI)?
Yes. All our core products, including silicon steel self-adhesive coatings and water-based epoxy insulating varnishes, come with factory inspection reports. Additionally, we maintain a robust third-party testing coordination mechanism to assist clients in connecting with authoritative institutions such as SGS and CTI for compliance certifications like RoHS, REACH, UL, and national standards (GB), ensuring our products meet terminal market requirements.

10. Partnership Invitation

Guangzhou Feisi Synthetic Materials Co., Ltd. welcomes partnerships with motor and appliance manufacturers, transformer producers, amorphous strip processors, and electronic packaging companies. Our core offerings include:

• Silicon Steel Self-Adhesive Coating (Specialized for Transformer Cores and Motor Stators)

• Amorphous Strip Composite Adhesive (for Interlayer Bonding of Amorphous Cores)

• Water-based Epoxy Insulating Varnish (Motor Coils / Electrical Insulation)

• Thiol-based curing agent (low-temperature, rapid epoxy curing)

• Waterborne phenoxy resin emulsion (for coating / adhesive modification)

To access product technical documentation, request free samples, or discuss technical solutions, please contact us using the methods below:

Guangzhou Faith Synthetic Materials Co., Ltd.

• Official hotline: 020-82793066

• Water-based Paint Business: Engineer Liu 15920494556

• Thiol Business: Engineer Zhang 13609004936

• Overseas Hotline (Mobile): +86 15920494556

• Email: sales@gzfaith.com

Silicon Steel Self-Adhesive Coating / Waterborne Epoxy Insulating Varnish — Choose Guangzhou Feisi. Dedicated to functional industrial eco-friendly new materials, driving green upgrades in high-end manufacturing.