Mica Paper

Description

What is Mica Paper?

Mica paper is an engineered mineral-based substrate created by depositing tiny mica flakes in a uniform, continuous sheet formation using a papermaking process. Unlike conventional paper, SIDA mica paper contains no cellulose or organic binders in its base form—only trace amounts of bonding agent (typically <2% for structure retention). This unique composition provides inherent thermal resistance and electrical insulation properties that synthetic materials cannot match.

The paper is subsequently impregnated with silicone, epoxy, or other high-temperature resins to create mica tapes, laminates, and molded insulations used throughout the electrical industry.

Manufacturing Process

SIDA produces mica paper through an advanced water-laid papermaking system:

Mica Exfoliation: Premium mica ore is delaminated into micro-thin flakes (<0.05mm thickness)
Pulping & Dispersion: Flakes are uniformly dispersed in water slurry without chemical additives
Continuous Formation: Slurry passes through a wire mesh to form a continuous sheet
Thermal Drying: Low-temperature drying preserves mica structure and properties
Calendering: Precision rolling achieves uniform thickness and density
Slitting & Winding: Custom widths and roll diameters for customer specifications

Product Portfolio

NINGBO SIDA NEW MATERIAL CO.,LTD.
Performance Parameters
Product name: Calcined Mica Paper
Item	Unit	502-1
Mass per Unit Area	g/m2	60	120	160
Tolerance of Mean	%(≦)	±3	±3	±3
Tolerance	%(≦)	±6	±7	±7
Average Thickness	μm	40	80	100
Penetration Time	s(≦)	25	65	90
Dielectric Strength	kV/mm	22	22	22
Tensile Strength	N/cm(≧)	3.2	4	6
Heat Loss	%	0.5	0.5	0.5
Conductivity of Water Extract	us/cm(≦)	15	15	15
Heat Resistance	℃(≧)	850

NINGBO SIDA NEW MATERIAL CO.,LTD.
Performance Parameters
Product name: Phlogopite Mica Paper
Item	Unit	P506
Mass per Unit Area	g/m2	90	170	250	350
Tolerance of Mean	%(≦)	±3	±3	±4	±4
Tolerance	%(≦)	±6	±7	±7	±7
Average Thickness	μm	55	105	140	180
Penetration Time	s(≦)	10	40	80	130
Dielectric Strength	kV/mm	15	15	15	15
Tensile Strength	N/cm(≧)	3	4.5	6.5	7.5
Heat Loss	%	0.5	0.5	0.5	0.5
Conductivity of Water Extract	us/cm(≦)	10	10	10	10
Heat Resistance	℃(≧)	700

NINGBO SIDA NEW MATERIAL CO.,LTD.
Performance Parameters
Product name: Synthetic Mica Paper
Item	Unit	S506
Mass per Unit Area	g/m2	105	120	160
Tolerance of Mean	%(≦)	±3	±3	±3
Tolerance	%(≦)	±6	±7	±7
Average Thickness	μm	65	78	100
Penetration Time	s(≦)	10	14	20
Dielectric Strength	kV/mm	16	16	16
Tensile Strength	N/cm(≧)	3	3.5	4.5
Heat Loss	%	0.25	0.25	0.25
Conductivity of Water Extract	us/cm(≦)	6	6	6
Heat Resistance	℃(≧)	1000

NINGBO SIDA NEW MATERIAL CO.,LTD.
Performance Parameters
Product name: Muscovite Mica Paper
Item	Unit	506
Mass per Unit Area	g/m2	65	120	250	320
Tolerance of Mean	%(≦)	±3	±3	±4	±4
Tolerance	%(≦)	±6	±7	±7	±7
Average Thickness	μm	45	75	150	200
Penetration Time	s(≦)	4	20	45	80
Dielectric Strength	kV/mm	17	17	17	17
Tensile Strength	N/cm(≧)	1.8	3.5	5.5	6
Heat Loss	%	0.4	0.4	0.4	0.4
Conductivity of Water Extract	us/cm(≦)	10	10	10	10
Heat Resistance	℃(≧)	500

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.

Standard Dimensions & Packaging

Parameter	Specification
Roll Widths	4.5mm, 5mm, 10mm, 15mm, 20mm, 25mm, 50mm, 100mm, 500mm, 1000mm (±1mm tolerance)
Roll Length	300m, 500m, 1000m, 2000m per roll (custom lengths available)
Core Diameter	76mm (3″), 152mm (6″)
Packaging	Anti-moisture PE film + corrugated box + pallet

Application Scenarios

1. Electrical Insulation Tapes

Application: Impregnated with silicone resin to create class H (180°C) or class C (200°C) mica tapes for coil and bar insulation in:

High-voltage motors and generators
Traction motors for EVs and railways
Wind turbine generators

Why SIDA Mica Paper: Uniform thickness ensures consistent resin penetration; high mica content (>98%) maximizes insulation performance; synthetic grade (S506) provides fire resistance for safety-critical windings.

2. Fire-Resistant Cables

Application: Construction of fire-resistant mica tapes that maintain circuit integrity during fire (950°C for 3+ hours per IEC 60331):

Emergency power circuits
Building safety systems
Data center power feeds

Recommended Grades: 502-1 (Calcined Muscovite) and S506 (Synthetic) for UL 2196 compliance; 507 (Low Resin) for VPI cable systems requiring resin impregnation.

3. Mica Laminates & Sheets

Application: Base material for rigid mica sheets (via hot-press resin bonding) used in:

Microwave oven waveguides
Heating element supports
Electrical insulation barriers

Why SIDA: Our 505 grade with trace bonding agent provides exceptional mechanical strength for high-pressure lamination; available in 0.05–0.18mm thicknesses optimized for different laminate thickness requirements.

4. Commutator Segments & Washers

Application: Commutator mica paper (505 grade) is die-cut into insulation segments for DC motor commutators:

Power tools
Automotive starters
Industrial drives

Performance: High flexural strength prevents cracking during high-speed rotation; precise thickness tolerance (±0.01mm) ensures uniform segment height.

5. Industrial Furnace Insulation

Application: P506 Phlogopite paper serves as primary insulation in:

Induction furnace coils
Heat treatment equipment
Glass melting furnaces

Advantage: Phlogopite’s superior moisture resistance prevents insulation degradation in humid industrial environments; 850°C continuous rating matches furnace operating conditions.

6. Aerospace & Defense

Application: S506 Synthetic mica paper for ultra-high temperature insulation in:

Aircraft fire zones
Satellite components
Military vehicle electronics

Certification: Meets outgassing requirements of ASTM E595; provides 1000°C thermal protection in zero-oxygen environments.

Frequently Asked Questions (FAQs)

Q1: What is the difference between mica paper and mica laminates?

A: Mica paper is the flexible, raw substrate (0.05–0.18mm thick) containing primarily mica flakes with minimal binder. Mica laminates are rigid sheets produced by impregnating mica paper with resin (10–30% content) and hot-pressing multiple layers. Think of mica paper as the “fabric” and laminates as the “finished composite material.” We supply both products.

Q2: Which grade should I use for fire-resistant cable production?

A: For organic insulations (silicone, epoxy), use 502-1 (Calcined Muscovite) for best fire performance and cost balance. For inorganic mineral cables, S506 (Synthetic) provides the highest temperature rating. If you require VPI processing, choose 507 (Low Resin) for optimal resin penetration. All meet IEC 60331 and BS 6387 standards.

Q3: Can you supply mica paper in narrow slit widths for tape production?

A: Yes. We precision-slit rolls to widths as narrow as 4.5mm with ±0.1mm tolerance. Our slitting process uses razor-slit technology to maintain clean edges without delamination. Popular widths: 5mm, 10mm, 15mm, 20mm for mica tape manufacturers.

Q4: How does moisture affect mica paper performance?

A: All grades have <0.5% moisture content as-shipped. Muscovite (506) absorbs slightly more moisture than Phlogopite (P506) in high-humidity environments (>90% RH). For tropical climates or furnace applications, P506 or S506 are recommended. Storage in original packaging maintains performance for 12+ months.

Q5: What is the minimum order quantity (MOQ) for custom grades?

A: Standard grades (506, P506): 100 kg (≈1000m² at 0.10mm). Specialty grades (S506, 502-1): 50 kg. Custom slit widths: 20 kg per width. Trial rolls (10kg) available for R&D at prototype pricing.

Q6: Do you provide third-party test certificates?

A: Every shipment includes a Certificate of Conformance (CoC) with dielectric strength, thickness, and thermal loss test data. Additional certified testing is available: IEC 60331 fire test, UL E332023 recognition, RoHS/REACH compliance (additional fees apply).

Testing Standards & Certifications

SIDA Mica Paper is manufactured and tested in compliance with:

International Standards

IEC 371-2:2004: “Specification for insulating materials based on mica”
IEC 60243-1: Dielectric strength test methods
IEC 60331-21/23: Fire resistance of cables
ASTM D828: Tensile properties of paper
ASTM D374: Thickness measurement
NEMA REA-1: Reinforced mica paper products

Certifications & Approvals

UL File E332023: Component recognition for electrical insulation systems
RoHS 3.0 (2015/863/EU): Asbestos-free, no heavy metals
REACH SVHC: Full chemical compliance declaration
ISO 9001:2015: Quality management system
IATF 16949: Automotive-grade quality (selected grades)

Quality Control Protocol

Incoming QC: Mica ore purity >98% via XRF spectroscopy
In-Process Control: Online thickness monitoring (±0.005mm tolerance)
Final Testing: 100% dielectric spot-check (10 random points per roll)
Traceability: Each roll laser-marked with batch code for full material traceability
Third-Party Audit: Annual UL factory inspection; quarterly SGS RoHS testing

Conversion & Fabrication Services

SIDA provides value-added processing to streamline your production:

Service	Capability	Advantage
Resin Impregnation	Silicone, epoxy, unsaturated polyester	In-house coating, 5–45% resin content
Slitting	4.5mm–1000mm widths	Razor-slit, no fraying
Die-Cutting	Washers, shapes from 10mm–500mm	±0.05mm precision
Lamination	Mica paper + glass cloth/film composites	Continuous process, bond strength >5N/cm
Custom Winding	300m–5000m lengths	Automated tension control

File Submission: Provide specifications via email or our online portal. Engineering review within 24 hours.

Packaging, Storage & Handling

Packaging:

Inner: Moisture-barrier PE film + silica gel desiccant
Outer: Corrugated carton (rolls) or wooden crate (pallets)
Labeling: Product code, batch number, dimensions, UL mark

Storage Recommendations:

Temperature: 5–35°C, Relative Humidity: <70%
Avoid direct sunlight and water contact
Shelf life: 12 months in sealed packaging

Handling:

Use clean gloves to prevent contamination
Store horizontally to prevent edge damage
Allow 24h acclimation before processing if temperature differential >10°C