Polyimide Glass Fiber Laminated Sheet

Description

SIDA’s Polyimide Glass Fiber Laminated Sheet represents the pinnacle of electrical insulation technology, engineered for applications requiring continuous operation in extreme thermal environments. The material consists of high-quality non-alkali glass fabric fully impregnated with polyimide thermosetting resin, manufactured through a precision lamination process that ensures uniform resin distribution and optimal mechanical integrity.

Key Performance Characteristics:

Superior Thermal Endurance: Rated for Class H (180°C) continuous operation with short-term capability up to 250°C, making it ideal for applications where FR4 (130°C) or G11 (155°C) materials would fail. The long-term thermal endurance complies with IEC 60216-1 standards, ensuring 30+ years of reliable service in oil-immersed transformers.

Exceptional Mechanical Properties: Maintains >80% of room-temperature flexural strength (≥400 MPa) even at 180°C, crucial for structural components in high-speed train traction motors and wind turbine generators. The material’s high specific strength (1.7-1.9 g/cm³ density) enables lightweight yet robust designs.

Outstanding Electrical Insulation: Delivers vertical dielectric strength of 20-35 kV/mm in transformer oil at 90°C, with parallel breakdown voltage exceeding 40 kV. The low dielectric dissipation factor (≤0.02 at 1MHz) and stable dielectric constant (4.5-5.5) make it superior for high-frequency applications up to 10GHz, including 5G antenna substrates and RF circuits.

Environmental Resistance: Exhibits minimal water absorption (<20mg for 2mm thick sheet) and excellent resistance to chemicals, radiation, and corona discharge. The material fulfills EU RoHS standards and passes NASA outgassing requirements for spacecraft applications.

Machinability: Despite its high thermal rating, the material machines cleanly with standard carbide tools, complying with JB/Z 141-1979 machining standards for laminated sheets. Negligible free fibers prevent skin irritation during fabrication.

Technical Data Tables

Table 1: Physical Properties

Property	Unit	Standard Values (IEC 60893-3-7)	Typical SIDA Values	Test Method
Color	–	Brown/Amber	Red-Brown	Visual
Density	g/cm³	1.70 – 1.90	1.85	IEC 60893-2
Water Absorption (2mm)	mg	≤18	14	GB/T 1303.9
Temperature Index (TI)	°C	≥180	≥200	IEC 60216-1
Flammability Rating	Class	HB40 or better	V-0 (optional)	UL 94 / GB/T 11020

Table 2: Mechanical Properties

Property	Unit	Standard Values	SIDA Typical	Test Conditions
Flexural Strength (⊥ laminations)	MPa	≥450	571	23°C
Flexural Strength at 180°C	MPa	≥280	353	180°C ±2°C
Tensile Strength	MPa	≥320	370	23°C
Impact Strength (Charpy, ∥ laminations)	kJ/m²	≥50	70	Notched
Apparent Bending Elastic Modulus	MPa	≥14,000	16,000	23°C
Bond Strength	N	≥5,000	6,200	Steel balls method

Table 3: Electrical Properties

Property	Unit	Standard Values	SIDA Typical	Test Conditions
Dielectric Strength (⊥ laminations, in oil)	kV/mm	≥20 (0.5-1mm)	22.5	90°C ±2°C
Dielectric Strength (2.1-3mm)	kV/mm	≥16	17.2	90°C ±2°C
Parallel Breakdown Voltage	kV	≥35	45	90°C ±2°C in oil
Insulation Resistance (after immersion)	Ω	≥1.0×10⁸	3.0×10⁸	23°C, 24h water
Dielectric Dissipation Factor (1MHz)	–	≤0.05	0.02	IEC 60893-2
Dielectric Constant (1MHz)	–	≤5.5	5.2	IEC 60893-2
Comparative Tracking Index (CTI)	V	≥600	600+	IEC 60112

Table 4: Dimensional Specifications

Thickness (mm)	Tolerance (mm)	Standard Sheet Sizes (mm)	Length/Width Tolerance
0.5 – 0.8	±0.15	1020 × 2040	±25 mm
1.0 – 1.5	±0.18 – ±0.25	1220 × 2470	±25 mm
2.0 – 3.0	±0.30 – ±0.37	1000 × 2000	±25 mm
4.0 – 6.0	±0.45 – ±0.60	1220 × 2440	±25 mm
8.0 – 10	±0.72 – ±0.94	Custom sizes available	Per agreement
12 – 20	±0.94 – ±1.30	–	–

Warping Limits: For 3-6mm thickness, deflection ≤10mm over 1000mm ruler length.

Note:The product specifications provided are for reference purposes only. Please refer to the actual product for final specifications. We also offer various sizes and thicknesses to meet your specific needs. For further customization, please contact us.

Application Scenarios

1. Electrical Motors & Generators

Traction Motors (High-speed rail, EVs): Slot liners, wedges, and end plates requiring continuous 180°C+ operation
Wind Turbine Generators: Rotor and stator insulation withstanding thermal cycling and vibration
Aerospace Motors: Lightweight structural components meeting NASA outgassing standards

2. Power Transformers

Dry-Type Transformers: H-class barriers, spacers, and coil forms with 30+ year service life
Oil-Immersed Transformers: Phase barriers and duct strips resisting oil degradation at 90°C
High-Voltage Switchgear: Arc chutes and inter-phase insulation

3. Electronics & RF Applications

5G/mmWave PCBs: Substrates for antennas and power amplifiers requiring stable Dk/Df at high frequencies
Aerospace Avionics: Circuit boards for engine control units operating at 150°C ambient
Semiconductor Testing: Probe cards and test fixtures for high-temperature device characterization

4. Renewable Energy

Solar Inverters: Insulation for power modules operating in hot climates
EV Battery Management Systems: Thermal barriers preventing thermal runaway propagation

5. Industrial Equipment

HVAC Systems: Compressor motor insulation
Chemical Processing: Pump motor insulation resisting corrosive environments
Plasma Etching Equipment: Structural components in semiconductor fabrication

Frequently Asked Questions (FAQs)

Q1: How does polyimide glass fiber laminate compare to FR4 and G11?
A: Polyimide offers superior thermal performance (180°C vs. 130°C for FR4, 155°C for G11) and better mechanical retention at elevated temperatures. While FR4 is suitable for general PCB applications, polyimide is mandatory for H-class insulation and aerospace. G11 is a cost-effective alternative for F-class (155°C) but cannot match polyimide’s long-term thermal stability.

Q2: What is the minimum order quantity and lead time?
A: Standard MOQ is 100 kg (approximately 30-50 sheets depending on thickness). Typical lead time is 2-3 weeks for standard sizes; custom thicknesses or sheets may require 4-5 weeks.

Q3: Can this material be used for machined parts?
A: Yes. It machines excellently with carbide tools following JB/Z 141-1979 guidelines. Recommended practices include sharp tools, moderate speeds, and dust extraction. The material produces minimal irritating fibers compared to standard glass epoxy.

Q4: What certifications does SIDA polyimide laminate hold?
A: Our material is certified to IEC 60893-3-7, UL 94 V-0 (optional), ISO9001, ISO14001, and RoHS compliant. Test reports for NASA outgassing and IEC 60216 thermal endurance are available upon request.

Q5: Is this material suitable for cryogenic applications?
A: Yes. Polyimide maintains flexibility and mechanical strength down to -196°C, making it suitable for superconducting magnet insulation and LNG equipment. Please consult our technical team for specific design recommendations.

Q6: What storage conditions are required?
A: Store horizontally on pallets ≥50mm high, away from direct sunlight and heat sources. Maximum storage temperature: 40°C. Shelf life is 18 months from manufacture date. Material exceeding shelf life can be retested for qualification.

Q7: Can you provide copper-clad polyimide laminates for PCBs?
A: Yes. We offer polyimide glass fiber CCL (Copper Clad Laminate) with 12-70μm copper foil, suitable for high-reliability PCBs. Contact our sales team for Dk/Df specifications at your target frequency.

Testing Standards & Compliance

International Standards

IEC 60893-3-7:2003+A1:2009: Primary specification for polyimide resin-based rigid laminated sheets
IEC 60893-1:2004: General requirements for thermosetting resin laminated sheets
IEC 60893-2:2023: Methods of test for industrial rigid laminated sheets
IEC 60216-1:2001: Thermal endurance testing (Temperature Index ≥200°C)

National Standards

GB/T 1303.1-2009: Chinese standard equivalent to IEC 60893-1
GB/T 1303.2-2009: Test methods (modified IEC 60893-2)
GB/T 5130-1997: Additional requirements for laminated sheets
GB/T 11020-2005 (IEC 60707): Flammability classification

Quality Certifications

ISO9001:2015 Quality Management System
ISO14001:2015 Environmental Management
UL 94 V-0 Flammability Rating (available upon request)
RoHS 3 (2015/863/EU) Compliance
REACH SVHC Compliance

Routine Testing Performed

Every production batch undergoes:

Visual inspection (surface flatness, edge integrity)
Dimensional verification (thickness, warping)
Density measurement
Flexural strength (room temperature)
Bond strength test
Dielectric strength (sample testing)

Full type-test reports including thermal aging, chemical resistance, and long-term dielectric performance are available for qualified OEM customers.