GB/T 9347-2025 Determination of vinyl acetate content in vinyl chloride-vinyl acetate copolymers
This is a draft translation for reference among interesting stakeholders. The finalized translation (passing through draft translation, self-check, revision and verification) will be delivered upon being ordered.
ICS 83.080.20 CCS G 31
People's Republic of China National Standard
GB/T 9347-2025 Replaces GB/T 9347-1988
Determination of Vinyl Acetate Content in Vinyl Chloride-Vinyl Acetate Copolymers
Issued on August 29, 2025
Implemented on March 1, 2026
Issued by the State Administration for Market Regulation
Standardization Administration of China
Contents
Foreword
Introduction
1 Scope
2 Normative References
3 Terms and Definitions
4 Method A—Bomb Combustion Method
5 Method B—Oxygen Flask Combustion Method
6 Test Data Processing
7 Permissible Error
8 Test Report
Determination of Vinyl Acetate Content in Vinyl Chloride-Vinyl Acetate Copolymers
Warning—Personnel using this document shall have practical experience in regular laboratory work. This document does not address all possible safety issues. Users are responsible for taking appropriate safety and health measures and ensuring compliance with national regulations.
1 Scope
This document describes methods for determining the vinyl acetate content in vinyl chloride-vinyl acetate copolymers.
This document applies to the determination of vinyl acetate content in vinyl chloride-vinyl acetate copolymers.
2 Normative References
The following documents contain provisions that, through reference in this text, constitute essential requirements for this document. For dated references, only the edition cited applies; for undated references, the latest edition (including all amendments) applies.
GB/T 7139—2023 Plastics—Vinyl Chloride Homopolymers and Copolymers—Determination of Chlorine Content
3 Terms and Definitions
No terms and definitions are defined in this document.
4 Method A—Bomb Combustion Method
4.1 Principle
The sample is oxidized with sodium peroxide, and the generated chloride is determined by potentiometric titration to calculate the vinyl chloride content, from which the vinyl acetate content is derived.
4.2 Reagents or Materials
See Clause 4.2 of GB/T 7139—2023.
4.3 Apparatus
See Clause 4.3 of GB/T 7139—2023. A suitable composite silver electrode may also be used.
4.4 Test Procedure
Follow Clause 4.4 of GB/T 7139—2023.
5 Method B—Oxygen Flask Combustion Method
