High temperature resistance aluminum foil is an important material in transformer winding manufacturing, especially suitable for power transformers, electric furnace transformers, and other equipment operating in high-temperature environments. Compared to conventional aluminum foil, high temperature resistance aluminum foil has superior heat resistance, better oxidation resistance, and more stable high-temperature mechanical properties, enabling long-term stable operation in environments above 200°C.
I. Technical Characteristics of High Temperature Resistance Aluminum Foil
1.1 What is High Temperature Resistance Aluminum Foil?
High temperature resistance aluminum foil refers to a special aluminum foil material that can maintain stable physical and electrical properties in high-temperature environments. Its core characteristics are high thermal class, stable high-temperature strength, excellent oxidation resistance, and long service life.
High temperature resistance aluminum foil typically achieves a thermal class of H (180°C) or even C (above 200°C), far exceeding the O state (annealed state, only resistant to about 100°C) of conventional aluminum foil.
1.2 Core Differences from Conventional Aluminum Foil
Higher Thermal Class: Conventional aluminum foil is only suitable for environments below 100°C, while high temperature resistance aluminum foil can withstand temperatures of 200°C or even higher.
Excellent High Temperature Strength: Maintains sufficient mechanical strength even at high temperatures, without softening or deforming.
Better Oxidation Resistance: Less prone to oxidation at high temperatures, resulting in a longer service life.
Stable Electrical Properties: Maintains stable conductivity over a wide temperature range.
1.3 Main Application Areas
- Electric Furnace Transformers (High Operating Temperature)
- Power Transformers Operating in High-Temperature Environments
- Transformers Supporting Smelting Equipment
- Special Transformers
- High-Temperature Heating Equipment
II. Detailed Specifications
2.1 Aluminum Foil Substrate Requirements
Alloy Series:
- 1060: Aluminum content ≥ 99.60%, pure aluminum, excellent corrosion resistance
- 1070: Aluminum content ≥ 99.70%, pure aluminum, better electrical conductivity
- 3003: Manganese content 1.0%-1.5%, aluminum-manganese alloy, superior high-temperature performance
Thermal Class:
- H grade (180°C): Continuous operating temperature 180°C
- F grade (155°C): Continuous operating temperature 155°C
- C grade (above 200°C): Continuous operating temperature above 200°C
2.2 High-Temperature Mechanical Properties
1060/1070 Pure Aluminum Series:
| Temperature | Tensile Strength | Elongation | Rate of Change |
|---|---|---|---|
| 20°C (Room Temperature) | 60-100MPa | ≥25% | Reference |
| 150°C | 50-85MPa | ≥20% | Strength reduction approximately 15% |
| 200°C | 40-70MPa | ≥18% | Strength reduction approximately 30% |
| 250°C | 30-50MPa | ≥15% | Strength reduction approximately 50% |
3003 Aluminum-Manganese Alloy Series:
| Temperature | Tensile Strength | Elongation | Rate of Change |
|---|---|---|---|
| 20°C (Room Temperature) | 100-150MPa | ≥20% | Baseline |
| 150°C | 85-130MPa | ≥18% | Strength reduction approximately 12% |
| 200°C | 70-110MPa | ≥15% | Strength reduction approximately 25% |
| 250°C | 55-90MPa | ≥12% | Strength reduction approximately 40% |
2.3 Electrical Performance Parameters
Conductivity:
- 1060/1070: Annealed state IACS ≥ 59%
- 3003: Annealed state IACS ≥ 45%
High Temperature Conductivity Stability:
- At 200°C, conductivity is approximately 85-90% of room temperature
- At 250°C, conductivity is approximately 75-85% of room temperature
2.4 Dimensions
Thickness Range: 0.3-3.0mm
Width Range: 10-1200mm
Width Tolerance:
- Standard Precision: ±1.0mm
- High Precision: ±0.5mm
- Ultra-High Precision: ±0.2mm
III. Selection Guide
3.1 Selection by Thermal Class
| Thermal Class | Recommended Alloy | Applicable Temperature | Main Applications |
|---|---|---|---|
| H Class (180°C) | 1060/1070 | ≤180°C | Electric Furnace Transformer, Medium Frequency Transformer |
| F Class (155°C) | 1060/1070/3003 | ≤155°C | Power Transformer, High Temperature Environment |
| C Class (200°C+) | 3003 | ≤220°C | Special High Temperature Transformer |
3.2 Selection Based on Application
Electric Furnace Transformer: H-grade recommended, 3003 alloy as first choice due to better high-temperature strength retention.
High-Temperature Power Transformer: F-grade or H-grade, selected based on actual operating temperature.
Special Transformer: Select appropriate thermal class based on specific technical requirements.
3.3 Selection Considerations
Ambient temperature is only one factor. Also consider: load current, cooling method (oil/air/water cooling), expected service life, and comprehensive economic considerations.
IV. Production Process Key Points
4.1 Raw Material Control
- Lower impurity content, strict control of iron and silicon
- Precise alloy composition ratio
- Material certificates and quality assurance required
4.2 Rolling Process
Hot rolling → Cold rolling → Annealing → Slitting and forming.
Key Control Points: Rolling temperature and reduction, annealing parameters (temperature, time, atmosphere), thickness uniformity.
4.3 Surface Treatment
- Passivation: Improves oxidation resistance, for oil-immersed transformers
- Insulation Coating: Enhances insulation, for special winding requirements
- Bright Finish: High surface smoothness, good heat dissipation
V. Industry Standards and Certifications
5.1 Implementation Standards
- GB/T 3190 – Chemical Composition of Wrought Aluminum and Aluminum Alloys
- GB/T 3880 – General Industrial Aluminum and Aluminum Alloy Plates and Strips
- IEC 60325 – Aluminum Foil for Electrical Transformers
- GB/T 5237 – Aluminum Alloy Building Profiles
5.2 Quality Certification
ISO 9001, ISO 14001, Product Factory Inspection Report, Third-Party Heat Resistance Test Report.
VI. Quality Inspection Methods
6.1 Routine Inspection Items
Dimensional: Thickness (micrometer, 0.001mm accuracy), Width (vernier caliper), Appearance (surface defects, edge quality).
Performance: Mechanical properties (tensile strength, elongation), Conductivity (eddy current conductivity meter).
6.2 High Temperature Performance Verification
- High temperature tensile test (150°C, 200°C, 250°C)
- High temperature oxidation test
- Thermal stability test
6.3 Storage and Transportation
Storage: Dry, ventilated warehouse, humidity ≤60%, avoid corrosive substances and direct sunlight.
Transportation: Moisture-proof, rain-proof, impact-proof, clearly labeled.
VII. Supplier Selection Recommendations
7.1 Key Evaluation Points
- Production Capacity: Aluminum foil rolling and slitting capabilities
- Testing Capacity: High-temperature performance test reports available
- Certifications: Complete quality management system certifications
- Delivery: Stock of standard specifications
- Technical Support: Selection advice available
7.2 Sample Testing
Conduct before bulk purchase: dimensional inspection, room temperature performance test, high-temperature performance test (if possible), winding test.
7.3 Price Considerations
Price factors: alloy grade (3003 > 1060/1070), thermal class (higher = higher price), specification precision, order quantity. Choose reasonable price-performance ratio while ensuring quality.
VIII. Common Specifications Reference
8.1 Electric Furnace Transformer
| Thickness | Width | Alloy | Thermal Class | Width Tolerance | Applications |
|---|---|---|---|---|---|
| 0.5mm | 100-400mm | 3003 | H Grade | ±0.5mm | Electric Furnace Transformer |
| 0.8mm | 100-500mm | 3003 | H Grade | ±0.5mm | Electric Furnace Transformer |
| 1.0mm | 100-600mm | 3003 | H Grade | ±0.8mm | Large Electric Furnace |
8.2 Power Transformer
| Thickness | Width | Alloy | Thermal Class | Width Tolerance | Applications |
|---|---|---|---|---|---|
| 0.3mm | 50-200mm | 1060 | F Grade | ±0.3mm | High Voltage Winding |
| 0.5mm | 50-400mm | 1060/1070 | F Grade | ±0.5mm | Medium Voltage Winding |
| 1.0mm | 100-600mm | 3003 | H Grade | ±0.8mm | Large Transformer |
8.3 Special Transformer
| Thickness | Width | Alloy | Thermal Class | Width Tolerance | Applications |
|---|---|---|---|---|---|
| 0.2mm | 20-100mm | 3003 | C Grade | ±0.2mm | Special High Temp Equipment |
| 0.3mm | 30-150mm | 3003 | C Grade | ±0.3mm | Special Transformer |
| 0.5mm | 50-200mm | 3003 | C Grade | ±0.5mm | High Temp Heating Equipment |
Conclusion
Our company has 30 years of experience in exporting magnetic wire and metal foil. We specialize in high temperature resistance aluminum foil for transformers with alloy series 1060, 1070, and 3003. Thermal classes cover F (155°C), H (180°C), and C (above 200°C). Thickness range: 0.3-3.0mm. Width range: 10-1200mm. Customization available. Standard specifications in stock with fast delivery. Samples shipped globally.
Contact our technical team for selection support.
Contact Information:
Email: office@cnlpzz.com
WhatsApp: 0086-19337889070