Mica Tape IEC and GB Standard Model Differentiation

1. Classification Basis

As an important branch of mica products, mica tape model differentiation is based on four core elements: substrate type, adhesive characteristics, reinforcement material, and application scenario. This forms a corresponding system between IEC international standards and GB national standards. The main classification dimensions include:

1.1 Substrate Type

Muscovite tape: Excellent electrical insulation performance, suitable for medium and low temperature environments

Phlogopite tape: Outstanding high temperature resistance, suitable for high temperature and fire-resistant scenarios

Synthetic mica tape: Chemical corrosion resistance, used in special industrial environments

1.2 Adhesive Type

Epoxy resin: High mechanical strength, suitable for structural insulation

Silicone resin: High temperature resistance (-60°C~200°C), suitable for dynamic insulation

Water-based adhesive: Environmentally friendly and solvent-free, suitable for food and pharmaceutical industries

1.3 Reinforcement Material

Glass cloth reinforcement: Improves tear resistance (e.g., GB/T 5019.12)

Polyester film reinforcement: Enhances flexibility (e.g., GB/T 5019.6)

Unreinforced: Pure mica paper structure, suitable for thin-layer insulation

1.4 Application Classification

For fire-resistant safety cables (GB/T 5019.10)

For motor coil insulation (GB/T 5019.7)

For vacuum pressure impregnation (GB/T 5019.8)

2. Naming Rules

2.1 GB National Standard Naming System

Adopts a combined structure of "substrate code + reinforcement material code + adhesive code + application code", following JB/T 2197-1996 standard:

Model composition example: 5440-1

First digit "5": Category code (mica products)

Second digit "4": Subcategory code (mica tape)

Third digit "4": Temperature index code (155°C)

Fourth digit "0": Variety code

Suffix "-1": Substrate type (1=muscovite, 3=phlogopite)

2.2 IEC International Standard Naming System

Adopts an alphanumeric combination of "function code + characteristic code + temperature resistance class":

Letter prefixes:

"M" for mica tape

"F" for film-backed

"G" for glass-backed

Numeric suffix: Indicates temperature class (e.g., 180 for 180°C)

Typical correspondence:

IEC 60371-3-8 → GB/T 5019.10 (mica tape for fire-resistant safety cables)

IEC 60371-3-4 → GB/T 5019.6 (polyester film-backed mica tape)

3. Core Product Model Comparison

3.1 Mica Tapes for Fire-Resistant Safety Cables

3.2 Mica Tapes for Motor Insulation

4. Key Technical Parameter Differences

4.1 Thickness Deviation

GB/T 5019.10: ±0.05mm (when thickness ≤0.2mm)

IEC 60371-3-8: ±0.03mm (stricter than national standard)

4.2 Fire Resistance Indicators

4.3 Dielectric Strength (20°C)

Unreinforced type: ≥15kV/mm (GB/T 5019.2)

Glass cloth reinforced type: ≥20kV/mm (IEC 60243)

5. Standard System Correspondence

5.1 Main Standard Correspondence Table

5.2 Standard Update Highlights

GB/T 5019.10-2022: Adds "halogen-free and low-smoke" environmental requirements, expands application scope of phlogopite tape

IEC 60371-3-8:2020: Introduces "fire resistance integrity" classification (Class A/B/C)

6. Selection Guide

6.1 Selection by Application Scenario

Building fire protection cables:Preferred 5440-3 (phlogopite + glass cloth) to meet GB 50016 fire resistance requirements

New energy vehicle motors:recommend 5432 high thermal conductivity mica tape to improve heat dissipation efficiency

Rail transit cables:choose IEC-certified products to ensure low temperature toughness at -40°C

6.2 Selection by Performance Requirements

6.3 Procurement Verification Points

Check product Identity integrity: "Model + Standard number" (e.g., 5440-3 GB/T 5019.10-2022)

Request type test report, focusing on "fire resistance time" and "oxygen index" indicators

Pay attention to batch consistency: Thickness deviation of the same batch should be ≤0.02mm

7. Frequently Asked Questions

7.1 How to distinguish between phlogopite tape and muscovite tape?

Visual identification: Phlogopite tape is pale yellow, muscovite tape is silvery white

Combustion test: Phlogopite tape leaves grayish-white ash after burning, muscovite tape shows black carbonization

logotype: Models ending with "-3" are phlogopite, "-1" are muscovite

7.2 Differences between old and new versions of GB/T 5019.10?

The 2022 version adds "halogen-free requirements" (Cl≤0.5%, Br≤0.5%)

Cancels "volume resistivity" indicator and adds "thermal shrinkage" requirement (≤2%@200°C/1h)

Test method updated from GB/T 18380 to GB/T 19666

7.3 Can IEC and GB standard products be used interchangeably?

Electrical performance indicators are basically compatible, but fire resistance test methods differ:

IEC uses "temperature gradient" test, GB uses "constant high temperature" test

Type test verification of interchangeability is recommended for critical applications

References

GB/T 5019.10-2022 "Insulating materials based on mica - Part 10: Mica paper tapes for flame-resistant security cables"

IEC 60371-3-8:1995 "Insulating materials based on mica - Part 3-8: Specifications for individual materials - Sheet 8: Mica paper tapes for flame-resistant security cables"

JB/T 2197-1996 "Classification, naming and model designation for electrical insulating materials"

GB/T 19666-2019 "General rules for flame retardant and fire resistant electric wires, cables and optical cables"