GB/T 41877.1-2022Plastics - Ethylene-vinyl alcohol (EVOH) copolymer moulding and extrusion materials - Part 1: Designation system and basis for specifications (English PDF)

Foreword

This document was drafted in accordance with the provisions of GB/T 1.1-2020

Directives for standardization - Part 1: Rules for the structure and drafting of

standardizing documents.

This document is Part 1 of GB/T 41877 Plastics - Ethylene-vinyl alcohol (EVOH)

copolymer moulding and extrusion materials. GB/T 41877 has issued the following

parts:

-- Part 1: Designation system and basis for specifications;

-- Part 2: Preparation of test specimens and determination of properties.

This document was modified in relation to ISO 21309-1:2019 Plastic ethylene-vinyl

alcohol (EVOH) copolymer moulding and extrusion materials - Part 1: Nomenclature

system and classification basis.

The technical differences between this document and ISO 21309-1:2019 and their

reasons are as follows:

-- ISO 1043-1 is replaced by the normative reference GB/T 1844.1 (see 4.1) to

adapt to the technical conditions of China and promote operability;

-- ISO 21309-2:2019 is replaced by the normative reference GB/T 41877.2 (see 4.2)

to adapt to the technical conditions of China and promote operability;

-- ISO 1133-1 is replaced by the normative reference GB/T 3682.1 (see 4.5) to

adapt to the technical conditions of China and promote operability;

-- For data block 4, the test condition M (see 4.5) is added to make the standard

more complete;

-- For examples of designations, the quoted standard number in examples is

changed from "ISO 21309" to "GB/T 41877.1", it is consistent with the

designation system of other national standards for plastic resins (see Chapter 5).

The following editorial changes have been made to this document:

-- The ethylene content represented by the number code 32 in data block 1 is

amended from " >30~34" to " >31~34" (see 4.2);

-- "Data block 2" in Table 2 "Letter codes used in data block 2" is amended to "data

block 3" (see 4.4); "data block 3" in Table 4 "Number codes used for melt mass-

flow rate in data block 3" is amended to "data block 4" (see 4.5);

Plastics - Ethylene-vinyl alcohol (EVOH) copolymer molding

and extrusion materials - Part 1: Designation system and

basis for specifications

1 Scope

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

5 (see Chapter 4).

2 Normative references

The following documents contain the provisions which, through normative reference in

this document, constitute the essential provisions of this document. For the dated

referenced documents, only the versions with the indicated dates are applicable to this

document; for the undated referenced documents, only the latest version (including all

the amendments) is applicable to this document.

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