GB/T 41877.1-2022 Translated English of Chinese Standard (GB/T 41877.1-2022, GBT41877.1-2022): Plastics -- Ethylene-vinyl alcohol (EVOH) copolymer moulding and extrusion materials -- Part 1: Designation system and basis for specifications
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This document specifies the designation system for ethylene-vinyl alcohol (EVOH) copolymer thermoplastic materials, and the system can be used as the basis for classification. Different types of ethylene-vinyl alcohol (EVOH) copolymer thermoplastic materials are distinguished with a classification system based on the following specified properties, such as melt mass-flow rate, together with recommended use and/or processing methods, important properties, additives, colorants, fillers, and reinforcing materials. This document applies to copolymers of ethylene and vinyl alcohol with an ethylene content (mol fraction) of 15%~60%. This document applies to materials that are conventionally in the form of powders, granules or pellets, unmodified or modified by colorants, additives, fillers, etc. This document does not imply that identically named materials will necessarily have identical properties. This document does not provide engineering data, performance data, or processing condition data necessary to describe a particular application and/or processing method for the material. If necessary, the test methods specified in GB/T 41877.2 are used to determine the additional information. In order to illustrate the special use of thermoplastic materials or to ensure the reproducibility of processing, additional information may be given in data blocks 4 and 5 (see Chapter 4).
according to GB/T additional information amended to data and/or processing methods basis for specifications block Data block China and promote classification system colorants conditions of China content mol fraction copolymer moulding copolymer thermoplastic materials data block indicates Description block Designation and classification Designation system determination of properties document applies ethylene content mol ethylene-vinyl alcohol copolymer ethylene-vinyl alcohol EVOH Examples of designation extrusion materials fillers important properties Letter code mass-flow rate MFR materials are distinguished melt mass melt mass-flow rate melting point moulding and extrusion National Standard normative reference GB/T Number codes Plastics polymers Positions 2~8 Preparation of test promote operability property item block provisions rate in data rate is divided recommended use and/or referenced documents reinforcing materials Shanghai Sinopec specified properties specimens and determination Standard number system and basis system for ethylene-vinyl Table technical conditions Terms and definitions test condition test specimens three numbers types of ethylene-vinyl Wang