Mica Sheet IEC and GB Standard Model Differentiation

1. Classification System Overview

As an important branch of mica products, mica board's model differentiation system is based on four core elements: substrate type, adhesive characteristics, structural form, and temperature resistance class. This forms a corresponding relationship between 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. While they maintain a high degree of coordination in technical requirements, there are differences in model naming rules and product classification details.

2. Model Naming Rules

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

Adopts a structure of four digits + supplementary code:

First digit: Category code (5 indicates mica products)

Second digit: Subcategory code (2 for rigid mica board, 5 for mica board for heating equipment)

Third digit: Temperature index code (3 corresponds to 130°C, 4 to 155°C, 5 to 180°C, etc.)

Fourth digit: Variety code

Supplementary code:numerical after hyphen indicates substrate type (1: muscovite, 3: phlogopite)

Typical examples:

5660-1: Muscovite substrate + silicone resin adhesive for heating equipment

5660-3: Phlogopite substrate + silicone resin adhesive for heating equipment

2.2 IEC International Standard Naming System

Adopts an alphabet + number combination that directly reflects product characteristics:

HP series: Rigid mica board (High Pressure Mica Board)

PM series: Flexible mica board (Plastic Mica Board)

Numeric suffix: Indicates temperature class and substrate type

Typical examples:

HP5: Corresponds to rigid mica board for heating equipment in GB/T 5022

PM2: Corresponds to flexible mica board in GB/T 5019.2

3. Core Product Model Comparison

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

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

4. Key Technical Parameter Differences

4.1 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)

4.2 Temperature Resistance Classification

4.3 Dielectric Strength Requirements

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

Hot state (500°C): ≥10kV/mm (additional requirement in GB standard)

5. Standard Updates and Replacement Relationships

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

The 2023 version adds HP5-1 type products to meet the technical requirements of new fields such as new energy vehicles

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

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

Adds halogen-free flame retardant requirements

Improves thermal aging test methods

Correspondence: 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 density index to 2.45g/cm³

Supplements dielectric strength test requirements at 500°C

6. Selection Guide

6.1 Selection by Temperature Scenario

≤500°C:Priority is given to selection 5660-1 (muscovite type) for optimal cost-effectiveness

500-800°C:Selection 5660-3 (phlogopite type) to balance temperature resistance and economy

≥800°C:Selection HP5-1 (synthetic mica type) for extreme high-temperature requirements

6.2 Selection by Performance Requirements

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

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

Environmental requirements:Selection halogen-free products (with "E" suffix in model)

6.3 Standard Compliance Verification

Check if the product logotype 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 intermittent temperature resistance performance (IEC 60371-2:2004 method)

7. Frequently Asked Questions

7.1 How to quickly distinguish between muscovite and phlogopite products?

Muscovite boards are silvery white, while phlogopite boards are golden yellow

Models ending with "-1" are muscovite, and those ending with "-3" are phlogopite

Phlogopite products are usually marked with "high temperature resistance 1000°C"

7.2 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 density differences (old standard upper limit 2.1g/cm³)

The newly added HP5-1 type cannot directly replace old models and requires re工艺验证

7.3 Price difference between IEC and GB standard products?

For the same specification, IEC certified products are 15-20% more expensive than GB standard products

For export products, it is recommended to choose dual-certified (GB+IEC) products

References

GB/T 5019.5-2023 "Insulating materials based on mica - Part 5: Rigid mica materials for heating equipment"

IEC 60371-3-3:2020 "Specification for insulating materials based on mica - Part 3-3: Specifications for individual materials - Sheet 3: Rigid mica materials for heating equipment"

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

GB/T 5019.2-2009 "Insulating materials based on mica - Part 2: Test methods"