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GB/T 46904-2026Polycarbosilanes (English PDF)

聚碳硅烷

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

January 28, 2026

Implementation date

August 1, 2026

Scope

GB/T 46904-2026 is the English-translated version of 聚碳硅烷.

GB/T 46904-2026 is the Chinese standard "Polycarbosilanes". Its scope clause reads: This document specifies the classification, requirements, inspection rules, marking, labeling and accompanying documentation, as well as packaging, transportation and storage of polycarbosilanes, describing...

The corresponding experimental methods were developed. This document applies to the inspection and acceptance of polycarbosilanes used in the preparation of silicon carbide-based composite materials, silicon carbide fibers, and silicon nitride fibers.

For use in coatings, adhesives, etc., refer to the following guidelines for polycarbosilanes. Its clauses include terms and definitions.

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Document preview — GB/T 46904-2026

National Standard of the People's Republic of China

ICS: 49.025.99
Classification: V 13

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1.Scope
2 Normative References
3.Terms and Definitions
4.Classification
5 Requirements
6.Test Methods
6.1 Appearance
6.2 Infrared Spectroscopy
6.3 Softening point and melting range
6.4 Viscosity
6.5 Ceramic yield (900°C, inert gas)
6.6 Oxygen content of pyrolysis products
6.7 Number-mean molecular weight and molecular weight distribution index
7 Inspection Rules
7.1 Inspection Classification
7.2 Identification and Testing
7.3 Quality Consistency Inspection
8.Marks, labels, and accompanying documents 6.
8.1 Mark
8.2 Tag
8.3 Accompanying Documents
9 Packaging, transportation and storage
9.1 Packaging
9.2 Transportation
9.3 Storage
Appendix A (Informative) Examples of Typical Polycarbosilane Infrared Spectra
Appendix B (Normative) Determination of the Yield of Polycarbosilane Ceramic

1 Scope

This document specifies the classification, requirements, inspection rules, marking, labeling and accompanying documentation, as well as packaging, transportation and storage of polycarbosilanes, describing...

The corresponding experimental methods were developed.

This document applies to the inspection and acceptance of polycarbosilanes used in the preparation of silicon carbide-based composite materials, silicon carbide fibers, and silicon nitride fibers.

For use in coatings, adhesives, etc., refer to the following guidelines for polycarbosilanes.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 191 Pictorial Symbols for Packaging and Storage

GB/T 2794-2022 Determination of viscosity of adhesives

GB/T 3864 Industrial Nitrogen

GB/T 4842 Argon

GB/T 4844 Pure Helium, High-Purity Helium and Ultra-Purity Helium

GB/T 6040 General Rules for Infrared Spectroscopic Analysis

GB/T 6678 General Rules for Sampling of Chemical Products

GB/T 8170 Rules for rounding off numerical values and the representation and determination of limiting values

GB/T 8979 Pure Nitrogen, High-Purity Nitrogen and Ultra-Purity Nitrogen

GB/T 18374 Terminology for Reinforcing Materials

GB/T 21781 Test methods for melting point and melting range of chemicals - capillary method

GB/T 40724 Terminology for Carbon Fibers and Their Composites

JJG342 Gel Chromatography System

JJG1135 Thermogravimetric Analyzer

JJF1321 Elemental Analyzer Calibration Specification

3 Terms and Definitions

The terms and definitions defined in GB/T 18374 and GB/T 40724, as well as the following terms and definitions, apply to this document.

3.1

The structure contains alternating bonds between silicon and carbon atoms, with hydrogen or organic groups attached to the silicon and carbon atoms. The molecular chains are linear or cyclic.

Polymers with branched structures.

3.2 softening point

The temperature at which a droplet appears inside the capillary and a gap forms between the sample and the inner wall.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 24 pages — is available in the English PDF.

Referenced standards

Normative references

JJF1321

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