• SIDA Transformer insulation materials

MICA PLATE

SIDA L-5660 Mica Plates are premium-grade electrical and thermal insulation materials manufactured from high-purity mica paper (Muscovite or Phlogopite) impregnated with high-temperature silicone resin. Available in rigid, flexible, glossy, and thick variants with thicknesses from 0.1mm to 100mm, these plates deliver exceptional dielectric strength (≥15 kV/mm), mechanical durability, and chemical resistance for critical applications ranging from domestic appliances to industrial furnaces operating at continuous temperatures up to 700°C. Fully asbestos-free and RoHS compliant.

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Description

What is SIDA Mica Plate?

SIDA L-5660 Mica Plates are engineered composite insulation materials consisting of approximately 90% high-quality mica flakes (Muscovite or Phlogopite) bonded with 10% high-temperature resistant silicone resin through a sophisticated hot-pressing process. This unique composition creates a homogeneous, dense structure that maintains exceptional electrical insulation and mechanical integrity under extreme thermal stress.
Our comprehensive L-5660 series includes four specialized product lines, each optimized for specific application requirements:

1. L-5660-H Series: Rigid Mica Plate

Code Variants: L-5660-H1 (Muscovite), L-5660-H3 (Phlogopite)
  • Surface Finish: Standard mesh/textured surface
  • Temperature Rating: 500°C (Muscovite) / 700°C (Phlogopite)
  • Key Attributes: Maximum mechanical strength, excellent rigidity
  • Primary Use: Structural insulation in appliances and industrial heating equipment

2. L-5660-S Series: Flexible Mica Plate

Code Variants: L-5660-S1 (Muscovite), L-5660-S3 (Phlogopite)
  • Surface Finish: Smooth, flexible
  • Temperature Rating: 500°C (Muscovite) / 700°C (Phlogopite)
  • Key Attributes: Remains flexible at room temperature; can be folded and formed without delamination
  • Primary Use: Coil insulation, thermal barriers requiring conformability

3. L-5660-G Series: Glossy Mica Plate

Code Variants: L-5660-G1 (Muscovite), L-5660-G3 (Phlogopite)
  • Surface Finish: Premium smooth, glossy appearance
  • Temperature Rating: 500°C (Muscovite) / 700°C (Phlogopite)
  • Key Attributes: Aesthetic appeal for visible components
  • Primary Use: High-end household appliances where appearance matters

4. L-5660-T Series: Thick Mica Plate

Code Variants: L-5660-T1 (Muscovite), L-5660-T3 (Phlogopite)
  • Thickness Range: 5mm to 100mm
  • Temperature Rating: 500°C (Muscovite) / 750°C (Phlogopite)
  • Key Attributes: Superior compressive strength, high-voltage resistance
  • Primary Use: Furnace linings, heavy-duty industrial insulation

Key Performance Advantages

Exceptional High-Temperature Insulation
  • Continuous operating temperature: 500–700°C (Muscovite vs. Phlogopite)
  • Intermittent peak temperature: Up to 1000°C
  • Dielectric strength retention: >10 kV/mm at 500°C
  • Voltage breakdown resistance: ≥15 kV/mm at operating temperature
Superior Mechanical Properties
  • Cross-breaking strength: ≥180 MPa (Rigid series)
  • Flexural strength: 150–250 MPa depending on grade
  • Compressive strength: >300 MPa (Thick series)
  • Hardness: Shore D 85–90 (Rigid grades)
Chemical & Environmental Stability
  • Asbestos-free and non-toxic composition
  • Excellent resistance to acids, alkalis, and oils
  • Water absorption: <1.0% after 24-hour immersion
  • Low smoke and odor emission when heated
  • RoHS, REACH, and UL certified
Excellent Processability
  • Thickness 0.1–2.0mm: Die-stamping, punching, and shearing
  • Thickness >2.0mm: CNC machining (milling, drilling, turning, grinding)
  • No delamination during machining or forming
  • Custom shapes per customer drawings

Technical Data Table

NINGBO SIDA NEW MATERIAL CO.,LTD.
Performance Parameters
Product name: Flexible Mica Plate
Item Unit R-5660-T1 R-5660-T3 Test Procedure
Mica Paper Muscovite Phlogopite
Mica Content % ≈88 ≈88 IEC 60371-2
Bond Content % ≈12 ≈12 IEC 60371-2
Density g/cm3 2.35 2.35 IEC 60371-2
Heat Resistance Continuous Services ℃ 500 700
Intermittent Services ℃ 800 1000
Water Absorption % ﹤1 ﹤2 GB/T 5019.2
Dielectric Strength kV/mm ﹥20 ﹥20 IEC 60243-1
Insulation Resistance at 23℃ Ω·cm 1017 1017 IEC 60243-1
Insulation Resistance at 500℃ Ω·cm 1012 1012 IEC 60243-1
Flame Resistance UL94 V-0 UL94 V-0 UL94
NINGBO SIDA NEW MATERIAL CO.,LTD.
Performance Parameters
Product name: Glossy Mica Plate
Item Unit R-5660-G1 R-5660-G3 Test Procedure
Mica Paper Muscovite Phlogopite
Mica Content % ≈92 ≈92 IEC 60371-2
Bond Content % ≈8 ≈8 IEC 60371-2
Density g/cm3 1.8-2.45 1.8-2.45 IEC 60371-2
Heat Resistance Continuous Services ℃ 500 700
Intermittent Services ℃ 800 1000
Heat Loss at 500℃ % ﹤1 ﹤1 IEC 60371-2
Heat Loss at 700℃ % ﹤2 ﹤2 IEC 60371-2
Flexural Strength MPa ﹥120 ﹥120 GB/T 5019.2
Water Absorption % ﹤1 ﹤1 GB/T 5019.2
Dielectric Strength kV/mm ﹥20 ﹥20 IEC 60243-1
Insulation Resistance at 23℃ Ω·cm 1017 1017 IEC 60243-1
Insulation Resistance at 500℃ Ω·cm 1012 1012 IEC 60243-1
Flame Resistance UL94 V-0 UL94 V-0 UL94
Smoking test s ＜4 ＜4 in house
NINGBO SIDA NEW MATERIAL CO.,LTD.
Performance Parameters
Product name: Thick Mica Plate
Item Unit R-5660-T1 R-5660-T3 Test Procedure
Mica Paper Muscovite Phlogopite
Mica Content % ≈88 ≈88 IEC 60371-2
Bond Content % ≈12 ≈12 IEC 60371-2
Density g/cm3 2.35 2.35 IEC 60371-2
Heat Resistance Continuous Services ℃ 500 700
Intermittent Services ℃ 800 1000
Water Absorption % ﹤1 ﹤2 GB/T 5019.2
Dielectric Strength kV/mm ﹥20 ﹥20 IEC 60243-1
Insulation Resistance at 23℃ Ω·cm 1017 1017 IEC 60243-1
Insulation Resistance at 500℃ Ω·cm 1012 1012 IEC 60243-1
Flame Resistance UL94 V-0 UL94 V-0 UL94

NINGBO SIDA NEW MATERIAL CO.,LTD.
Performance Parameters
Product name: Rigid Mica Plate
Item Unit R-5660-H1 R-5660-H3 Test Procedure
Mica Paper Muscovite Phlogopite
Mica Content % ≈92 ≈92 IEC 60371-2
Bond Content % ≈8 ≈8 IEC 60371-2
Density g/cm3 1.8-2.45 1.8-2.45 IEC 60371-2
Heat Resistance Continuous Services ℃ 500 700
Intermittent Services ℃ 800 1000
Heat Loss at 500℃ % ﹤1 ﹤1 IEC 60371-2
Heat Loss at 700℃ % ﹤2 ﹤2 IEC 60371-2
Flexural Strength MPa ﹥120 ﹥120 GB/T 5019.2
Water Absorption % ﹤1 ﹤1 GB/T 5019.2
Dielectric Strength kV/mm ﹥20 ﹥20 IEC 60243-1
Insulation Resistance at 23℃ Ω·cm 1017 1017 IEC 60243-1
Insulation Resistance at 500℃ Ω·cm 1012 1012 IEC 60243-1
Flame Resistance UL94 V-0 UL94 V-0 UL94
Smoking test s ＜4 ＜4 in house

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. Home Appliance Industry

Products: L-5660-H1, L-5660-G1, L-5660-S1 (Muscovite grades)
Specific Applications:
  • Microwave Ovens: Waveguide covers, magnetron insulation
  • Hair Dryers: Heating element support brackets, mica washers for thermal switches
  • Toasters & Kettles: Mica plate terminal insulation, heating element mounts
  • Cooking Appliances: Induction cooktop coil insulation, thermal barriers
  • Air Heaters: Flexible mica plates for curved heating element wrapping
Why SIDA: Our G-series glossy plates provide aesthetic appeal for visible parts, while H-series offers maximum durability for structural components. S-series flexibility enables complex shapes without cracking.

2. Industrial Heating Equipment

Products: L-5660-H3, L-5660-T3 (Phlogopite grades for higher temps)
Specific Applications:
  • Wound Heaters: Coil-former insulation, end-plate barriers
  • Cylindrical Resistance Heaters: Tube support insulators
  • Band Heaters: Flexible mica plate wrapping for barrel heaters
  • Cartridge Heaters: High-density insulation for compact designs
  • Infrared Heaters: Reflector backing insulation
Why SIDA: Phlogopite grades handle continuous 700°C operation. Thick T-series plates (up to 100mm) provide superior compressive strength for heavy-duty furnace applications.

3. Metallurgy & Foundry Industry

Products: L-5660-T3, L-5660-H3 (Phlogopite, thick grades)
Specific Applications:
  • Induction Furnaces: Slip plane protection between coil grout and refractory
  • Arc Furnaces: Electrode insulation, thermal barriers
  • Intermediate Frequency Furnaces: Coil insulation and support
  • Heat Treatment Equipment: High-temperature gasket materials
  • Continuous Casting: Mould insulation plates
Why SIDA: Thick plates maintain structural integrity under extreme thermal cycling. Excellent resistance to slag and metal splash. Non-asbestos composition meets environmental regulations.

4. Electrical Equipment & Switchgear

Products: L-5660-H1, L-5660-S1
Specific Applications:
  • Circuit Breakers: Arc chute barriers, contact support insulation
  • Transformers: High-temperature barrier insulation
  • Electric Motors: Commutator V-rings, slot wedges, end-winding support
  • Generators: Rotor and stator insulation components
  • Magnetic Coils: Layer insulation and coil formers
Why SIDA: High dielectric strength prevents flashover. Rigid plates provide stable support under mechanical vibration. Flexible plates conform to coil shapes.

5. Automotive & Electric Vehicles

Products: L-5660-S1, L-5660-G1
Specific Applications:
  • EV Battery Packs: Thermal runaway barriers between cells
  • Exhaust Gas Sensors: High-temperature sensor insulation
  • Electric Heaters: HVAC system heating element support
  • Charging Systems: Electrical isolation components
Why SIDA: Lightweight, non-toxic composition. Flexible grades accommodate vibration and thermal expansion. Meets automotive outgassing requirements.

6. Chemical & Process Industries

Products: L-5660-H3, L-5660-T3
Specific Applications:
  • Chemical Reactors: Heating element insulation in aggressive environments
  • Electric Sterilization Equipment: High-temperature insulation for medical autoclaves
  • Process Heaters: Thermal and electrical insulation in corrosive atmospheres
  • Pump & Valve Motors: Explosion-proof motor insulation
Why SIDA: Excellent chemical resistance to acids and alkalis. Stable performance in humid, corrosive environments. Thicker plates for high-voltage isolation.

Frequently Asked Questions (FAQs)

Q1: What is the difference between Muscovite and Phlogopite mica plates?

A: Muscovite (L-5660-H1/G1/S1/T1) operates continuously at 500°C, offers higher dielectric strength (>20 kV/mm), and is more cost-effective. Phlogopite (L-5660-H3/G3/S3/T3) withstands continuous 700°C, provides better moisture resistance, and excels in humid or wet environments. Both achieve 1000°C intermittent peaks. Choose Muscovite for most electrical applications; Phlogopite for extreme heat or moisture.

Q2: Can mica plates be machined to custom shapes?

A: Yes. Plates ≤2.0mm thick can be die-stamped, punched, or laser-cut. Plates >2.0mm thick are easily machined via CNC milling, drilling, turning, and grinding without delamination. Simply provide your CAD drawings (.dxf, .dwg, .step), and our engineering team will verify manufacturability within 24 hours. Tolerance down to ±0.05mm achievable.

Q3: Are SIDA mica plates asbestos-free and environmentally compliant?

A: Absolutely. All L-5660 series plates are 100% asbestos-free, RoHS 3.0 compliant, and REACH registered. They emit minimal smoke (<50 Ds per ASTM E662) and no toxic gases when heated, meeting IEC 60707 requirements. UL File E332023 certification ensures global recognition.

Q4: What thickness tolerance can you guarantee?

A: Standard tolerances: ±0.03mm for 0.1–0.5mm; ±0.05mm for 0.51–2.0mm; ±0.10mm for 2.01–10mm; ±0.15mm for >10mm. Tighter tolerances available upon request for precision applications such as commutators or high-voltage bushings.

Q5: How do I choose between Rigid (H), Flexible (S), Glossy (G), and Thick (T) series?

A:
  • Rigid (H): General-purpose structural insulation—most common choice
  • Flexible (S): Applications requiring bending or forming at room temperature (coils, curved surfaces)
  • Glossy (G): Visible components where appearance matters (premium appliances)
  • Thick (T): Heavy-duty insulation requiring high compressive strength (>5mm thickness)

Q6: What is the typical lead time and MOQ?

A: Standard stocked sheets (0.1–5mm): Ship within 3–5 business days; MOQ 10 sheets. Custom machined parts: 10–15 days for prototypes, 15–25 days for production quantities; MOQ 100 pieces. Thick plates (>20mm): 7–10 days; MOQ 1 sheet. Emergency expediting available.

Q7: Do you provide test certificates?

A: Every shipment includes a Certificate of Conformance (CoC) with batch-specific dielectric strength, thickness, and thermal loss data. Additional certifications available: UL Yellow Card, RoHS/REACH test report, IEC 371-2 type test report (additional fees may apply).

Testing Standards & Certifications

SIDA L-5660 Mica Plates are manufactured and tested in full compliance with:

International Standards

  • IEC 371-2:2004: “Mica paper-based insulating materials”
  • IEC 60243-1: Dielectric strength measurement
  • IEC 60216: Thermal endurance evaluation
  • ASTM D229: Structural integrity tests for rigid insulation
  • ASTM D790: Flexural properties determination
  • NEMA LI-1: Industrial laminating thermosetting products
  • UL 94: Flammability rating (V-0 achieved)

Certifications & Approvals

  • UL File E332023: Component recognition for electrical insulation (all series)
  • RoHS Directive 2015/863/EU: Asbestos-free, heavy metals compliant
  • REACH Regulation (EC 1907/2006): Full SVHC screening
  • ISO 9001:2015: Quality management system certified
  • IATF 16949: Automotive-grade production (selected grades)

Quality Assurance Protocol

  1. Incoming Inspection: Mica paper resin content and purity >98%
  2. In-Process Control: Real-time monitoring of press temperature (±5°C), pressure (±2 bar), and dwell time
  3. Final Testing: 100% dielectric spot-check (5 points per sheet), thickness laser-scanning
  4. Dimensional Verification: CMM measurement for machined parts
  5. Traceability: Each plate laser-etched with batch code for 10-year traceability
  6. Third-Party Audit: Annual UL factory inspection; quarterly SGS compliance testing

Custom Fabrication Services

SIDA provides comprehensive in-house machining to deliver finished components:
Service Capability Tolerance Equipment
Die Stamping 0.1–2.0mm thickness ±0.05mm 50–200 ton precision presses
CNC Milling Up to 100mm thick ±0.08mm 3-axis & 5-axis machining centers
Water Jet Cutting All thicknesses ±0.10mm 60,000 PSI abrasive cutting
Surface Grinding Precision thickness control ±0.02mm Surface grinders
Drilling & Tapping M3–M20 threads ±0.05mm CNC drill/tap centers
Hot Forming 3D shapes (S-series) Per drawing Custom forming ovens
Minimum Order: 1 piece for prototypes; 50 pieces for production runs
File Formats: DXF, DWG, STEP, IGES, PDF, hand sketches with dimensions
Engineering Support: Free DFM (Design for Manufacturability) review within 24 hours

Packaging, Storage & Shipping

Packaging Standards

  • Inner Wrap: Moisture-barrier PE film + anti-corrosion VCI paper
  • Edge Protection: Cardboard corners for sheet products
  • Outer Packaging: Heavy-duty corrugated cartons (sheets) or fumigated wooden crates (thick plates/pallets)
  • Labeling: Each package marked with product code, batch number, dimensions, UL logo, and RoHS compliance QR code

Storage Recommendations

  • Environment: Temperature 10–30°C, Relative Humidity <60%
  • Handling: Store flat on level surfaces; avoid bending or impact
  • Shelf Life: 24 months in sealed packaging; 12 months once opened
  • Precautions: Keep away from water, oils, and direct sunlight

Global Shipping

  • Standard Delivery: 10–25 days FOB major ports
  • Express Options: Air freight for urgent orders (3–7 days)
  • Trade Terms: EXW, FOB, CIF, DDP available
  • Customs Support: Full documentation including COO, MSDS, and compliance certificates
SIDA Insulation Materials

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