Mica Board Models: A Complete Guide to IEC/GB Industrial Standards

As a key branch of mica products, mica boards have a model classification system based on four core elements: substrate type, adhesive characteristics, structural form, and temperature resistance level. This system forms a corresponding relationship between the IEC international standards and GB national standards. Among them, the IEC 60371 series and GB/T 5019 series constitute the main framework of mica board standards. The two are highly consistent in technical requirements but differ in model naming rules and product classification details.

1. Model Naming Rules

1.1 GB National Standard Naming System (JB/T 2197-1996)

It adopts a structure of four digits + supplementary code:

1st digit: Category code (5 represents mica products)

2nd digit: Subcategory code (2 represents rigid mica boards, 5 represents mica boards for electric heating equipment)

3rd digit: Temperature index code (3 corresponds to 130℃, 4 to 155℃, 5 to 180℃, etc.)

4th digit: Variety code

Supplementary code: A number after a hyphen indicates the substrate type (1: Muscovite, 3: Phlogopite)

Typical Examples:

5660-1: Mica board for electric heating equipment with muscovite substrate and silicone resin adhesive

5660-3: Mica board for electric heating equipment with phlogopite substrate and silicone resin adhesive

1.2 IEC International Standard Naming System

It adopts a combination of letters and numbers, directly reflecting product characteristics:

HP Series: High Pressure Mica Board (rigid mica board)

PM Series: Plastic Mica Board (flexible mica board)

Numeric suffix: Indicates temperature resistance level and substrate type

Typical Examples:

HP5: Corresponding to the rigid mica board for electric heating equipment in GB/T 5022

PM2: Corresponding to the flexible mica board in GB/T 5019.2

2. Comparison of Core Product Models

2.1 Rigid Mica Boards for Electric Heating Equipment (GB/T 5019.5-2023)

Model	Substrate Type	Adhesive	Temperature Resistance	Corresponding IEC Model	Application Scenarios
5660-1	Muscovite Paper	Silicone Resin	Continuous 500℃ / Intermittent 800℃	IEC 371-3-3 HP5	Home Appliances, Electric Irons, Ovens
5660-3	Phlogopite Paper	Silicone Resin	Continuous 600℃ / Intermittent 1000℃	IEC 371-3-3 HP5	Industrial Electric Furnaces, Arc Furnaces, Metallurgical Equipment
HP5-1	Synthetic Mica Paper	Inorganic Adhesive	Continuous 1000℃	IEC 371-3-3 HP7	New Energy Vehicle Battery Heating Systems

2.2 Flexible Mica Boards (GB/T 5019.3-2009)

Model	Structural Characteristics	Temperature Resistance Level	Typical Applications
5130	Pure Mica Paper	130℃	Motor Slot Insulation
5150	Glass Cloth Reinforced	155℃	Transformer Insulation
5180	Film Reinforced	180℃	Precision Instrument Insulation

3. Key Technical Parameter Differences

3.1 Density Index

GB Standard: 1.6～2.45g/cm³ (adjusted according to GB/T 5022-1998)

IEC Standard: 1.6～2.1g/cm³ (original specification in IEC 371-3-3:1983)

3.2 Temperature Resistance Classification

Level	GB Standard (℃)	IEC Standard (℃)	Application Standard No.
Ordinary Type	500	500	GB/T 5019.5-2023
Enhanced Type	600	600	IEC 371-3-3:1983
High-Temperature Type	1000	1000	GB/T 5019.5-2023 (Newly Added)

 

3.3 Dielectric Strength Requirements

Normal Temperature (20℃): ≥20kV/mm (consistent between GB/T 5019.2-2009 and IEC 60243-1:1998)

Hot Temperature (500℃): ≥10kV/mm (newly added requirement in GB Standard)

4. Standard Update and Replacement Relationship

GB Standard Update

GB/T 5022-1998 → GB/T 5019.5-2014 → GB/T 5019.5-2023

The 2023 version adds the HP5-1 model to meet the needs of new fields such as new energy vehicles.

Adjusts the density index range and adds environmental protection requirements (RoHS compliance).

IEC Standard Update

IEC 60371-3-3:1983 → IEC 60371-3-3:2020

Adds halogen-free flame retardant requirements.

Improves the thermal aging test method.

Corresponding Relationship

GB/T 5019.5-2023 equivalently adopts IEC 60371-3-3:2020 (MOD) with technical adjustments in the following aspects:

Adds requirements for phlogopite substrate products.

Adjusts the upper limit of the density index to 2.45g/cm³.

Supplements the 500℃ dielectric strength test requirement.

5. Selection Guide

5.1 Selection by Temperature Scenario

≤500℃: Prioritize 5660-1 (muscovite type) for optimal cost-effectiveness.

500-800℃: Choose 5660-3 (phlogopite type) to balance temperature resistance and economy.

≥800℃: Select HP5-1 (synthetic mica type) to meet extreme high-temperature needs.

5.2 Selection by Performance Requirements

Mechanical strength priority: Choose glass cloth reinforced type (with "G" suffix in the model).

Insulation performance priority: Choose high-purity mica paper substrate (with "H" prefix in the model).

Environmental protection requirements: Choose halogen-free products (with "E" suffix in the model).

5.3 Standard Compliance Verification

Check if the product label contains the complete model (e.g., "HP5(5660-3) GB/T 5019.5-2023").

Confirm that the test report covers key indicators such as density, dielectric strength, and thermal weight loss.

For high-temperature applications, specially verify the intermittent temperature resistance performance (using the IEC 60371-2:2004 method).

6. Frequently Asked Questions (FAQs)

Q1: How to quickly distinguish between muscovite and phlogopite products?

Muscovite boards are silvery white, while phlogopite boards are golden yellow. Products ending with "-1" in the model are muscovite, and those ending with "-3" are phlogopite. Phlogopite products are usually marked with "High Temperature Resistance 1000℃".

Q2: Compatibility between GB/T 5019.5-2023 and old standards?

Products of new and old standards can be used interchangeably, but attention should be paid to the density difference (the upper limit of the old standard is 2.1g/cm³). The newly added HP5-1 model cannot directly replace the old model and requires re-process verification.

Q3: Price difference between IEC and GB standard products?

For the same specification, the price of IEC-certified products is 15-20% higher than that of GB standard products. For exported products, it is recommended to choose dual-certified (GB+IEC) products.

This guide covers the core content of mica board IEC/GB standards, helping you accurately select and apply mica board products in international trade and industrial applications. For more customized product information and technical support, please contact us.

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