Bsi bs en 00522 1998 (1999)

www bzfxw com BRITISH STANDARD BS EN 522 1998 Adhesives for leather and footwear materials — Bond strength — Minimum requirements and adhesive classification The European Standard EN 522 1998 has the[.]

BRITISH STANDARD BS EN

522:1998

Adhesives for leather

and footwear

materials — Bond

strength — Minimum

requirements and

adhesive classification

The European Standard EN 522:1998 has the status of a

British Standard

ICS 61.060; 83.180

BS EN 522:1998

This British Standard, having

been prepared under the

direction of the Sector Board

for Materials and Chemicals,

was published under the

authority of the Standards

Board and comes

into effect on

15 July 1998

© BSI 05-1999

ISBN 0 580 29644 X

National foreword

This British Standard is the English language version of EN 522:1998 published by the European Committee for Standardization (CEN)

The UK participation in its preparation was entrusted to Technical Committee STI/52, Adhesives, which has the responsibility to:

— aid enquirers to understand the text;

— present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed;

— monitor related international and European developments and promulgate them in the UK

A list of organizations represented on this committee can be obtained on request to its secretary

Cross-references

The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic

Catalogue

A British Standard does not purport to include all the necessary provisions of

a contract Users of British Standards are responsible for their correct application

Compliance with a British Standard does not of itself confer immunity from legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 5 and a back cover

This standard has been updated (see copyright date) and may have had amendments incorporated This will be indicated in the amendment table on the inside front cover

Amendments issued since publication

BS EN 522:1998

Contents

Page

ii blank

EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

EN 522

February 1998

ICS 61.060; 83.180

Descriptors: Adhesives, footwear, materials, leather, rubber, polyvinyl chloride, bonding, destructive test, bond strength, peel test,

shear test, creep test at elevated temperature, testing conditions, classification

English version Adhesives for leather and footwear materials — Bond strength — Minimum requirements and adhesive

classification

Adhésifs pour cuir et matériaux de la

chaussure — Force d’adhésion — Prescriptions

minimales et classification des adhésifs

Klebstoffe für Leder und Schuhwerkstoffe — Festigkeit der Klebungen —

Mindestanforderungen und Klebstoffklassifikation

This European Standard was approved by CEN on 24 January 1998

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained

on application to the Central Secretariat or to any CEN member

This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions

CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom

CEN

European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung

Central Secretariat: rue de Stassart 36, B-1050 Brussels

© 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national

EN 522:1998

© BSI 05-1999 2

Foreword

This European Standard has been prepared by

Technical Committee CEN/TC 193, Adhesives, the

secretariat of which is held by AENOR

This European Standard shall be given the status of

a national standard, either by publication of an

identical text or by endorsement, at the latest by

August 1998, and conflicting national standards

shall be withdrawn at the latest by August 1998

According to the CEN/CENELEC Internal

Regulations, the national standards organizations

of the following countries are bound to implement

this European Standard: Austria, Belgium,

Czech Republic, Denmark, Finland, France,

Germany, Greece, Iceland, Ireland, Italy,

Luxembourg, Netherlands, Norway, Portugal,

Spain, Sweden, Switzerland and the

United Kingdom

Contents

Page

EN 522:1998

1 Scope

This standard specifies a method for evaluating

solvent based and dispersion adhesives intended for

use for sole attachment

It specifies minimum requirements for some

strength properties of bonds made with these

adhesives and establishes an adhesive classification

based on the results obtained with reference test

materials representing types of leather, rubber or

plastic materials often used as upper or bottom

materials in footwear manufacture

2 Normative references

This European Standard incorporates, by dated or

undated reference, provisions from other

publications.These normative references are cited

at the appropriate places in the text and the

publications are listed hereafter For dated

references, subsequent amendments to or revisions

of any of these publications apply to this European

Standard only when incorporated in it by

amendment or revision For undated references the

latest edition of the publication referred to applies

EN 923, Adhesives — Terms and definitions

EN 1392, Adhesives for leather and footwear

materials — Solvent based and water based

adhesives — Test methods for measuring the bond

strength under specified conditions

ISO 554, Standard atmospheres for conditioning

and/or testing — Specifications

ISO 868, Plastic and ebonite — Determination of

indentation hardness by means of a durometer

(Shore hardness)

3 Definitions

For the purposes of this standard, the definitions in

accordance with EN 923, EN 1392 and the following

definition applies:

3.1

adhesives for footwear materials

adhesives intended for the permanent bonding of

footwear materials

4 Principle

Two strips of reference test material are bonded

with the adhesive to be tested to produce test pieces

of defined form These test pieces are stored under

specified conditions and their bond strength is

determined under specified conditions

5 Safety

Persons using this standard shall be familiar with

normal laboratory practice

This standard does not purport to address all the safety problems, if any, associated with its use

It is the responsibility of the user to establish safety and health practices and to ensure compliance with any European or national regulatory conditions

6 Requirements

6.1 General

In practice, leather and footwear material bonds are usually part of complex structures which are subjected to various stresses and used in different climates

All requirements met in practice cannot be covered

by one single standard Therefore this standard shall only define some minimum requirements for the bonding properties of sole attaching adhesives

In addition this standard establishes a suitable classification using the results obtained with

reference test materials specified in 7.2.

6.2 Adhesive identification

The adhesive to be tested shall be completely identified in the test report, in particular note the name and/or designation, manufacturer, date of manufacture/supply and/or lot number, main polymer and colour For two-part adhesives the nature of the cross-linking agent and the mixing ratio of the components shall be identified

6.3 Minimum requirements 6.3.1 The initial peel resistance 2 min after assembling shall not be less than 1,0 N/mm

6.3.2 The peel resistance after 3 days to 5 days storage in the standard atmosphere 23/50 in accordance with ISO 554 shall not be less than 5,0 N/mm

6.3.3 The peel resistance after 7 days at (50 ± 2) °C and 2 days to 4 days storage in the standard atmosphere 23/50 in accordance with ISO 554 shall

be at least 80 % of the value determined in

accordance with 6.3.2 but shall not be less

than 5,0 N/mm

6.3.4 The shear strength after 3 days to 5 days storage in the standard atmosphere 23/50 in accordance with ISO 554 shall not be less than 2,0 MPa

6.3.5 The peel resistance at a load of 1,5 kg

at (50 ± 2) °C for 10 min (“creep resistance”) shall be less than 10 mm

NOTE These minimum requirements refer only to bonds in everyday footwear worn under ambient conditions.

For special footwear, for instance safety, work or sports shoes, which are subjected to additional stresses and/or different environmental conditions, other additional testing can be necessary.

EN 522:1998

7 Test methods

7.1 Types of tests

7.1.1 Peel test at (23 ± 2) °C

In accordance with EN 1392

7.1.2 Shear test at (23 ± 2) °C

In accordance with EN 1392

7.1.3 Peel test at (50 ± 2) °C for 10 min at a

constant load of 1,5 kg (“creep test”)

In accordance with EN 1392

7.2 Reference test materials

A large number of different materials are used in

leather processing and in the footwear industry

From the most important and most often used

material groups the following materials shall be

selected as reference test materials:

a) Reference test material leather 1: Upper

leather, chrome tanned split;

b) Reference test material leather 2: Sole leather,

butt, vegetable tanned;

c) Reference test material SBR 1: Resin rubber,

nominal Shore A hardness 95 in accordance with

ISO 868;

d) Reference test material SBR 2: SBR rubber,

nominal Shore A hardness 70 in accordance with

ISO 868;

e) Reference test material NBR: Nitrile rubber,

Shore A hardness 80 nominal in accordance with

ISO 868;

f) Reference test material SBSR: Thermoplastic

rubber, nominal Shore A hardness 60 in

accordance with ISO 868;

g) Reference test material polyvinylchloride

(PVC): Plasticized (PVC), nominal Shore A

hardness 70 in accordance with ISO 868

NOTE The properties and the suitability of the reference test

materials listed are checked and ensured by the supplier The

properties specified (e.g tannage, Shore hardness) serve only to

distinguish the different materials, if necessary.

7.3 Preparation of test pieces

Prepare peel and shear test pieces in accordance

with EN 1392 using the reference test materials

specified in 7.2 in the following combinations:

Leather 1/SBR 1

Leather 1/Leather 2

Use the assembly of leather 1/SBR 1 to evaluate the suitability of the adhesive for bonding upper leather, the most widely used upper material in the shoe industry

For the evaluation of the adhesive for bonding all

other reference test materials specified in 6.2

having a higher inherent strength than leather 1 (leather 2, SBR 1, SBR 2, NBR, SBSR, and PVC) use test pieces prepared from two strips of the same reference test material

To carry out the creep test (see 7.1.3) at (50 ± 2) °C,

depending on the polymer base of the adhesive under test, prepare leather 1/SBR 1 test pieces (e.g for polychloroprene adhesives) or

leather 1/PVC test pieces (e.g for polyurethane adhesives)

7.4 Storage of test pieces

Before testing, store all test pieces as specified

in 6.3.

Store test pieces for measuring the minimum

requirements in compliance with 6.3.3 for 3 days

to 5 days and in compliance with 6.3.5 for 5 days

to 7 days in the standard atmosphere of 23/50 in accordance with ISO 554 before warming up

to (50 ± 2) °C in an oven or in a warm air cabinet respectively

7.5 Procedures and evaluation

In accordance with EN 1392

8 Test report

The test report shall include:

a) a reference to this European Standard;

b) a complete identification of the adhesive used

(see 6.2), particularly the name and/or

designation, manufacturer, lot number and/or manufacturing date, type of adhesive, adhesive base polymer type, and mixing proportions in the case of multi-part adhesives;

c) designation of the reference test materials used

(see 7.2), the preparation of the bonding surfaces

in accordance with EN 1392 and, if used, identification of the halogenation agent, particularly the name and/or designation, manufacturer, lot number, number of parts, solvent (if known) and date of expiry;

d) a detailed description of the bonding procedure

in accordance with EN 1392, particularly the number of adhesive coats applied with intermediate drying times, the heat activation temperature used, and all operations not specified in this European Standard;

e) a description of the conditions of storage of test specimens;

EN 522:1998

f) test results, individual and mean values and mode of failure in accordance with EN 1392;

g) all factors which have affected the results;

h) classification of the adhesive in accordance

with clause 9;

i) date of test

9 Adhesive classification

9.1 General

Where tests have been carried out on various

standard reference test materials as specified in 7.2

and satisfactory results obtained in compliance

with 6.3.1 to 6.3.5 the adhesive shall be regarded as

being generally suitable for bonding those types of

material

NOTE The test results obtained with test material are not

necessarily applicable to similar shoe materials The actual

leather or footwear material to be used should be tested with the

adhesive to ensure that minimum requirements specified in 6.3

are met.

9.2 Adhesive classes

The adhesives shall be classified in accordance with the test results obtained with test pieces prepared from the reference test materials

An adhesive shall be suitable for bonding a class of material listed in Table 1, provided that the results for test specimens prepared from this material meet

or surpass the minimum requirements specified

in 6.3.1 to 6.3.4 In addition the results for test

pieces of leather 1/SBR 1 or leather 1/PVC shall comply with the minimum requirements given

in 6.3.5

Table 1 — Adhesive classes and codes

NOTE An adhesive should be included in each class for which

it completely meets the five minimum requirements.

BS EN

522:1998

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