GB/T 5169.19-2022 PDF English
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Fire hazard testing for electric and electronic products - Part 19: Abnormal heat - Mould stress relief distortion test
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| GB/T 5169.19-2006 | English | 394 |
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Fire hazard testing for electric and electronic products -- Part 19: Abnormal heat -- Mould stress relief distortion test
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GB/T 5169.19-2022: Fire hazard testing for electric and electronic products - Part 19: Abnormal heat - Mould stress relief distortion test
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT5169.19-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.220.40;29.020
CCS K 04
GB/T 5169.19-2022 / IEC 60695-10-3:2016
Replace GB/T 5169.19-2006
Fire hazard testing for electric and electronic products - Part
19: Abnormal heat - Mould stress relief distortion test
(IEC 60695-10-3:2016, Fire hazard testing - Part 10-3: Abnormal heat - Mould stress
relief distortion test, IDT)
ISSUED ON: OCTOBER 12, 2022
IMPLEMENTED ON: MAY 1, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 7
2 Normative references ... 7
3 Terms and definitions ... 8
4 Test overview ... 8
5 Test devices ... 8
6 Samples ... 9
7 Conditioning ... 9
8 Test procedure ... 9
9 Test criteria ... 11
10 Information to be given in the relevant product specification ... 11
11 Test report ... 12
Appendix NA (Informative) Published parts of “Fire Hazard Testing for Electric and
Electronic Products” ... 13
References ... 16
Foreword
This document is 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 19 of “Fire hazard testing for electric and electronic products”.
For the published parts of “Fire hazard testing for electric and electronic products”, see
Appendix NA.
This document replaces GB/T 5169.19-2006 “Fire hazard testing for electric and
electronic products - Part 19: Abnormal heat - Mould stress relief distortion test”.
Compared with GB/T 5169.19-2006, except for structural adjustment and editorial
changes, the main technical changes are as follows:
a) In the chapter Scope, the description of the sample passing test is supplemented
(see Chapter 1; see Chapter 1 of the 2006 edition);
b) Some terms and definitions are added (see Chapter 3);
c) A detailed description of the test device is added (see Chapter 5);
d) The test procedures are divided into two types: “Parts exposed to uniform
maximum operating temperature” and “Parts exposed to varying operating
temperatures” (see Chapter 8; see Chapter 7 of the 2006 edition);
e) The test environment for parts exposed to uniform maximum operating
temperature is changed from “in the air” to “in the oven” (see 8.2; see 7.1 of the
2006 edition);
f) Chapter 11 has been added, which gives the contents that shall be included in the
test report (see Chapter 11).
This document is identical to IEC 60695-10-3:2016 “Fire hazard test - Part 10-3:
Abnormal heat - Mould stress relief distortion test”.
The following minimal editorial changes have been made to this document:
--- For purpose of the consistency with the existing standard series, the name was
changed to “Fire hazard testing for electric and electronic products - Part 19:
Abnormal heat - Mould stress relief distortion test”;
--- The informative references including IEC 60050 (all parts), IEC Guide104, and
ISO/IEC Guide 51 are moved from Chapter 2 into the References;
Fire hazard testing for electric and electronic products - Part
19: Abnormal heat - Mould stress relief distortion test
1 Scope
This document specifies a mould stress relief distortion test.
This document applies to electrotechnical equipment containing parts made of
polymeric materials.
This test method is mainly used to evaluate the effect caused by the residual process
stress relief of finished moulded polymer components. Stress relief occurs when the
sample (energized or not) is exposed to a specified temperature for a certain period of
time. If the sample meets the specified test standard after conditioning at room
temperature, it is considered to have passed the test.
This document is intended for use by technical committees when preparing standards
in accordance with the principles set out in IEC Guide 104 and ISO/IEC Guide 51.
One of the tasks of technical committees is to use this series of standards wherever
applicable when preparing standards in this field. Unless specifically mentioned or
listed in the relevant standards, the requirements, test methods, or test conditions of this
document will not apply.
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.
GB/T 5169.1-2015 Fire hazard testing for electric and electronic products - Part 1:
Terminology concerning fire tests (IEC 60695-4:2012, IDT)
ISO 13943:20081) Fire safety - Vocabulary
IEC 60216-4-1 Electrical insulating materials - Thermal endurance properties - Part 4-
1) Note: There is a new version ISO 13943:2017.
The oven shall be single-chamber, and its temperature difference, fluctuation, and test
temperature change shall meet the requirements of IEC 60216-4-1.
In addition, after the sample is placed into the chamber and the chamber is closed, the
temperature of the oven shall return to the specified temperature (±2 °C) within 5 min,
and the overshoot shall not exceed 5 °C.
5.2 Temperature measuring device
The temperature shall be measured by a device with an accuracy of ±1% or better. The
preferred method is to measure the temperature by inserting a type K or J thermocouple
into the sample holder.
6 Samples
Samples shall be determined by the relevant product specification. The preferred
sample is the complete end product. Unless otherwise stated in the relevant
specification, three samples shall be tested during the test.
7 Conditioning
Unless otherwise specified in the relevant product specification, the sample shall be
placed in a laboratory environment with a temperature of 15 ℃~35 ℃ and relative
humidity of 75% or lower for at least 24 hours before the test.
8 Test procedure
8.1 Summary
The procedure described in 8.2 applies to parts whose end use is to be exposed to a
uniform maximum operating temperature. If an enclosure or part is subject to varying
temperatures at different locations of the part, or is too large to be placed into an oven,
the procedure described in 8.3 may be more applicable. For example, the enclosure of
a hair dryer may be hot near the heating element, but the stress relief around the power
cord is near room temperature. The procedure described in 8.3 takes into account the
temperature differences caused by the operation of the equipment in the oven.
8.2 Parts exposed to a uniform maximum operating temperature
Unless otherwise stated in the relevant product specification, the test shall be carried
out in an oven; the product shall be placed according to the manufacturer’s product
instructions, and the temperature shall be set according to the requirements of a) or b):
a) The test temperature shall be the ambient temperature plus the maximum
allowable temperature rise of the part that needs to be considered as specified in
the relevant product specification, or
b) The test temperature shall be the maximum allowable operating temperature of
the part that needs to be considered as specified in the relevant product
specification.
Note 1: The study found that, for handheld devices, it is useful for the product to be supported by a
mechanical clamp in at least one representative orientation.
Unless otherwise stated in the relevant product specification, the test temperature shall
not be lower than 70 °C.
In some cases, the product technical committee can choose to increase the test
temperature according to the safety factor. This would be appropriate if a safety factor
is not included in the operating temperature or temperature rise specified in the relevant
product specification.
Note 2: A representative safety factor is 10 K.
8.3 Parts exposed to varying operating temperatures
Alternative to 8.2, the test shall be carried out in an oven in which the finished product
can be energized. Air circulation within the oven shall simulate actual end-use
conditions. Unless otherwise stated in the relevant product specification, the air
temperature in the oven measured on the product support surface shall be kept at 10 K
higher than the maximum allowable ambient temperature for which the end product is
designed to operate, but not lower than 60 °C. Unless otherwise stated in the relevant
product specification, the end product shall be operated continuously at 106% or 94%
of the normal rated voltage, whichever results in a higher temperature.
8.4 Test setup
Regardless of which test procedure (8.2 or 8.3) is chosen, after the oven has reached
the required test temperature, place each sample in the oven for the duration that is
specified in the product specification. The handheld device shall be supported by a
mechanical clamp in at least one representative orientation. The sample shall be
conditioned in the oven for a period of time according to relevant product specifications,
or for the time that is enough to achieve thermal equilibrium, but not less than 7 h.
Longer conditioning durations can be selected for parts of a large mass or for samples
where the initial testing indicates the possibility of further distortion.
After the sample has cooled to room temperature, inspect the sample for shrinkage,
bending, or other distortion that may affect its compliance with product specification
requirements.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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