GB/T 41487-2022 in English

《GB/T 41487-2022复合型密封垫片材料》由TC406（全国非金属矿产品及制品标准化技术委员会）归口，主管部门为中国建筑材料联合会。

Composite sealing gasket material
1 Scope

This document specifies the classification and marking of composite gasket materials, requirements, test methods, inspection rules and signs, packaging, transportation, storage.
This document applies to the production of sealing gaskets of metal core material on both sides of the composite non-metallic materials (excluding materials containing asbestos components). This document does not apply to metal rubber sheet and metal core material multi-layer composite non-metallic materials.
2 Normative References

The following documents constitute the essential provisions of this document through the normative references in the text. Among them, the date of the reference documents, only the date of the corresponding version applies to this document; undated reference documents. The latest version of the document (including all the revision sheets) is applicable to this document.
GB/T 191 Package storage and transportation pictorial signs
GB/T 540-2008 Test method for oil-resistant asbestos rubber sheet
GB/T 6682 Analytical laboratory water specifications and test methods
GB/T 8170 Numerical modification rules and limit values of the representation and determination
GB/T 20671.1-2020 Classification system and test methods for non-metallic gasket materials Part 1: Classification system for non-metallic gasket materials
GB/T 20671.3 Classification system and test method for non-metallic gasket materials Part 3: Test method for liquid resistance of gasket materials
GB/T 30709 Test method for compressibility and resilience of laminated composite gasket materials
GB/T 30710 Test method for creep relaxation rate of laminated composite gasket materials
3 Terms and Definitions

There are no terms and definitions that need to be defined in this document.
4 Classification and Marking

4.1 Classification

Composite gasket materials are divided into three categories according to the non-metallic materials they are compounded with: copying method non-asbestos metal composite sheet (CJ), rolling method non-asbestos metal composite sheet (GJ), and flexible graphite metal composite sheet (MJ).
Non-asbestos metal composite sheet by copying method, non-asbestos metal composite sheet by rolling method and flexible graphite metal composite sheet are divided into two types of metal tooth plate composite sheet (C) and metal plate composite sheet (P) according to the composite form.
4.2 Marking

Composite gasket material marking consists of product name, this document number, category, nominal thickness.
Example.
Copy method non-asbestos metal tooth sheet composite (CJC), thickness 1.0 mm.
Marked as: composite gasket material GB/T XXXXX-CJC-1.0
5 Requirements

5.1 Appearance quality

The surface of the composite gasket material should be flat and free from cracks, delamination, impurities, bubbles, scratches and other defects that affect the use.
5.2 Dimension and deviation

5.2.1 The length and width of the composite gasket material is ±5 mm according to the user's requirements.

5.2.2 The allowable deviation of the thickness of the composite plastic sealing gasket material shall conform to the provisions of Table 1. If the user has special requirements for thickness deviation, according to user requirements.
Table 1 Allowable deviation of thickness
Unit is millimeter

Composite sealing gasket material
1 Scope
2 Normative References
3 Terms and Definitions
4 Classification and Marking
5 Requirements
6 Test Methodology