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GB/T 3512-2014 English PDF (GBT3512-2014)

GB/T 3512-2014 English PDF (GBT3512-2014)

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GB/T 3512-2014: Rubber, vulcanized or thermoplastic -- Accelerated ageing and heat resistance tests -- Air-oven method

GB/T 3512-2014
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.060
G 40
GB/T 3512-2014 / ISO 188.2011
Replacing GB/T 3512-2001
Rubber, vulcanized or thermoplastic - Accelerated ageing
and heat resistance tests - Air-oven method
(ISO 188.2011, Rubber, vulcanized or thermoplastic -
Accelerated ageing and heat resistance tests, IDT)
ISSUED ON. DECEMBER 22, 2014
IMPLEMENTED ON. JUNE 01, 2015
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 7
2 Normative references ... 7
3 Principle ... 7
4 Apparatus ... 8
5 Calibration ... 11
6 Test pieces ... 11
7 Time interval between vulcanization and testing ... 12
8 Ageing conditions (duration and temperature) ... 13
9 Procedure ... 13
10 Expression of results ... 14
11 Precision ... 14
12 Test report ... 14
Annex A (Informative) Determination of the air speed in ovens with
forced air circulation ... 16
Annex B (Informative) Precision ... 18
Annex C (Informative) Guidance for using precision results ... 26
Annex D (Normative) Calibration schedule ... 28
Bibliography ... 30
Foreword
This Standard is drafted according to the rules provided in GB/T 1.1-2009. This Standard replaces GB/T 3512-2001 Rubber, vulcanized or thermoplastic - Accelerated ageing and heat resistance tests - Air-oven method; compared with GB/T 3512-2001, the main technical changes are as follows.
— Add test method of rubber tensile performance ISO 37 and test method of rubber hardness ISO 48 (as shown in 3.1 of this edition);
— Add test method of multicell ageing oven, cabinet type ageing oven and forced ventilation ageing oven and its wind speed (as shown in 4.1.2, 4.1.3, 4.1.4 of this edition);
— Add provision for equipment verification (as shown in chapter 5 of this edition); — Use ISO 23529 to replace GB/T 2941 (as shown in chapter 8 of 2001 edition); — Add results of precision test (as shown in chapter 11 of this edition; chapter 10 of 2001 edition).
Using translation method, this Standard equivalently adopts ISO 188.2011 Vulcanized rubber or thermoplastic elastomer hot air - Accelerated aging heat resistance test. The Chinese documents, in this Standard, which have corresponding relationship with the normative international documents are as follows.
— GB/T 528-2009 Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties (ISO 37.2005, IDT);
— GB/T 2941-2006 Rubber - General procedures for preparing and conditioning test pieces for physical test methods (ISO 23529.2004, IDT);
— GB/T 6031-1998 Rubber, vulcanized or thermoplastic - Determination of hardness (hardness between 10 IRHD and 100 IRHD) (idt ISO 48.1994).
This Standard was proposed by China Petroleum and Chemical Industry Association. This Standard shall be under the jurisdiction of Branch of National Rubber and Rubber Goods Technical Committee for Standardization General Test Method (SAC/TC 35/SC 2). Main drafting organizations of this Standard. Guangzhou Synthetic Material Research Institute Co., Ltd., National Rubber and Latex Products Quality Supervision Test Center, Fengshen Tyre Co., Ltd., Cooper Chengshan (Shandong province) Co., Ltd., Qingdao Yi Kesi New Material Co., Ltd., Shandong Bayi Tyre Manufacture Co., Ltd., Jiangsu Mingzhu Test Machinery Co., Ltd., Beijing Rubber Industry Research and Design Institute, Guizhou Tyre Co., Ltd.
Introduction
Accelerated ageing and heat resistance tests are designed to estimate the relative resistance of rubber to deterioration with the passage of time. For this purpose, the rubber is subjected to controlled deteriorating influences for definite periods, after which appropriate properties are measured and compared with the corresponding properties of the unaged rubber.
In accelerated ageing, the rubber is subjected to a test environment intended to produce the effect of natural ageing in a shorter time.
In the case of heat resistance tests, the rubber is subjected to prolonged periods at the same temperature as that which it will experience in service.
Two types of method are given in this Standard, namely an air-oven method using a low air speed and an air-oven method using forced air ventilation for a high air speed. The selection of the time, temperature and atmosphere to which the test pieces are exposed and the type of oven to use will depend on the purpose of the test and the type of polymer.
In air-oven methods, deterioration is accelerated by raising the temperature. The degree of acceleration thus produced varies from one rubber to another and from one property to another.
Degradation can also be accelerated by air speed. Consequently, ageing with different ovens can give different results.
Consequences of these effects are.
a) Accelerated ageing does not truly reproduce under all circumstances the changes produced by natural ageing.
b) Accelerated ageing sometimes fails to indicate accurately the relative natural or service life of different rubbers; thus, ageing at temperatures greatly above ambient or service temperatures may tend to equalize the apparent lives of rubbers, which deteriorate at different rates in storage or service. Ageing at one or more intermediate temperatures is useful in assessing the reliability of accelerated ageing at high temperatures.
c) Accelerated ageing tests involving different properties may not give agreement in assessing the relative lives of different rubbers and may even arrange them in different orders of merit. Therefore, deterioration should be measured by the changes in property or properties which are of practical importance, provided that they can be measured reasonably accurately.
Air-oven ageing should not be used to simulate natural ageing which occurs in the Rubber, vulcanized or thermoplastic - Accelerated ageing
and heat resistance tests - Air-oven method
WARNING — Persons using this Standard should be familiar with normal laboratory practice. This Standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions.
1 Scope
This Standard specifies accelerated ageing or heat resistance tests on vulcanized or thermoplastic rubbers. Two methods are given.
Method A. air-oven method using a cell-type oven or cabinet oven with low air speed and a ventilation of 3 to 10 changes per hour;
Method B. air-oven method using a cabinet oven with forced air circulation by means of a fan and a ventilation of 3 to 10 changes per hour.
2 Normative references
The articles contained in the following documents have become part of this document when they are quoted herein. For the dated documents so quoted, all the modifications (including all corrections) or revisions made thereafter shall be applicable to this document.
GB/T 25269-2010 Rubber - Guide to the calibration of test equipment (ISO 18899.2004, IDT)
ISO 37 Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties
ISO 48 Rubber, vulcanized or thermoplastic - Determination of hardness (hardness between 10IRHD and 100 IRHD)
ISO 23529 Rubber - General procedures for preparing and conditioning test pieces for physical test methods
3 Principle
3.1 General
keep the temperature uniform and stable during the test and to verify that the oven used is within the temperature limits with regard to time and space. Increasing the air speed in the oven improves temperature homogeneity. However, air circulation in the oven and ventilation influence the ageing results. With a low air speed, accumulation of degradation products and evaporated ingredients, as well as oxygen depletion, can take place. A high air speed increases the rate of deterioration, due to increased oxidation and volatilization of plasticizers and antioxidants. 4.1.2 Cell-type oven
The oven shall consist of one or more vertical cylindrical cells having a minimum height of 300 mm. The cells shall be surrounded by a thermostatically con...

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