GB/T 7125-2014 English PDF (GBT7125-2014)

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GB/T 7125-2014: Test method for thickness of adhesive tapes
GB/T 7125-2014
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.180
G 38
Replacing GB/T 7125-1999
Test method for thickness of adhesive tapes
ISSUED ON: JULY 08, 2014
IMPLEMENTED ON: DECEMBER 01, 2014
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Devices ... 5 
5 Samples and specimens ... 6 
6 Test environment ... 6 
7 Test process ... 6 
8 Report ... 7 
Appendix A (Informative) Structural changes in this standard as compared with
ASTM D3652/D3652M-01:2012 ... 8 
Appendix B (Informative) Technical differences between this standard and
ASTM D3652/D3652M-01:2012 and their causes ... 9 
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 7125-1999 “Test method for thickness of
pressure-sensitive adhesive tape and adhesive tape”. As compared with GB/T
7125-1999, the main technical changes are as follows:
- CHANGE the standard name from “Test method for thickness of pressure-
sensitive adhesive tape and adhesive tape” to “Test method for thickness
of adhesive tapes” (see cover; cover of the 1999 version);
- ADD a clause on normative references (see clause 2);
- DELETE the clause on meaning and use (see clause 3 of the 1999 version);
- MODIFY the requirements for the gauge head diameter and the
measurement pressure (see 4.1 and 4.2; 4.1.1 and 4.1.2 of the 1999
version);
- MODIFY the requirements for the width and length of the specimen (see
5.1; 5.1 of the 1999 version);
- MODIFY the requirements for the temperature range of test environment
and the time required to condition the specimen (see clause 6; 6.1 of the
1999 version);
- MODIFY the requirements for reading time during the testing (see 7.2; 7.1
of the 1999 version).
This standard is revised in accordance with ASTM D3652/D3652M-01:2012
“Test method for thickness of pressure-sensitive adhesive tapes”.
This standard has several structural adjustments as compared with ASTM
D3652/D3652M-01:2012. Appendix A provides a comparison list of clause
numbers of them.
Tas compared with ASTM D3652/D3652M-01:2012, there are technical
differences in this standard. The clauses involved in these differences have
been indicated by a vertical single line (|) in the blank position of outer margin.
Appendix B provides technical differences as well as the causes.
This standard has made the following editorial changes:
- MODIFY the description of the length unit, ASTM D3652/D3652M-01:2012
proposes three length units of mils, mm, in in 3.2.1, 5.1.1, 9.2, 10.1.2,
respectively. However, in order to use the international unit of measurement,
this standard uses mm or μm as the unit of length;
- ADD Appendix A (informative) “Structural changes in this standard as
compared with ASTM D3652/D3652M-01:2012”;
- ADD Appendix B (informative) “Technical differences between this standard
and ASTM D3652/D3652M-01:2012 and their causes”.
This standard was proposed by the China Petroleum and Chemical Industry
Federation.
This standard shall be under the jurisdiction of the National Adhesive
Standardization Technical Committee (SAC/TC 185).
Drafting organizations of this standard: Guangzhou Hongchang Adhesive Tape
Factory, Shanghai Rubber Products Research Institute, Yongda (Zhongshan)
Co., Ltd., Lianguan (Zhongshan) Adhesive Products Co., Ltd., Yongyi Adhesive
(Zhongshan) Co., Ltd., Guangdong Damei New Materials Co., Ltd., Zhongshan
New Asia Adhesive Products Co., Ltd., Shanghai Jinhua Adhesive Products
Development Co., Ltd., Fengdu Technology Development Co., Ltd., Hebei
Huaxia Industrial Co., Ltd.
The main drafters of this standard: Wu Weiqing, Tang Minfeng, He Hanjian,
Chen Huachang, Wang Can, Zhang Jianqing, Cheng Xin, Ke Yuehu, Yang
Yangquan, Sun Fengxian, Xu Ning.
This standard replaces the standard previously issued as follows:
- GB/T 7125-1986, GB/T 7125-1999.
Test method for thickness of adhesive tapes
1 Scope
This standard specifies the test method for the thickness of pressure-sensitive
adhesive tapes and other adhesive tapes.
This standard applies to the determination of the thickness of adhesive tape. It
is used for quality control of adhesive tape products.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 22396 Terminology relating to pressure sensitive adhesive products
GB/T 22520 Dial thickness gauges
3 Terms and definitions
The terms and definitions as defined in GB/T 22396 as well as the following
terms and definitions apply to this document.
3.1
Thickness of adhesive tape
The vertical distance between the front and back of the tape as measured at
a specified pressure.
4 Devices
4.1 Test instrument: Dial thickness gauges which comply with the requirements
of GB/T 22520. Its measuring head consists of two upper and lower planes,
wherein the higher smaller plane is circular and has a diameter of 5 mm ~ 16
mm. The two planes shall be parallel to each other and perpendicular to their
axes. The non-parallelism between the two planes shall be less than 0.005 mm.
4.2 When the specimen is clamped between the upper and lower planes of the
measuring head, it is subjected to a stable pressure of 40 kPa ~ 60 kPa.
4.3 The resolution of the dial thickness gauge is not more than 0.002 mm.
5 Samples and specimens
5.1 The width of the specimen is larger than the diameter of the smaller
measuring head. The length of the specimen is not less than 50 mm. The
specimen does not have wrinkle or folding mark.
5.2 Before sampling for the test, remove at least three layers, but not more than
six layers, from the sample adhesive tape roll.
5.3 Unless otherwise specified, the number of samples of each set of adhesive
tape roll shall be not less than five. Take one specimen from each of the
adhesive tape roll sample. At the time of sampling, from the free-rotating
adhesive tape roll, use a rate of about 500 mm/s ~ 750 mm/s to take the
specimen. When it cannot take sample at the specified rate due to width or
other factors, use the rate of about 500 mm/s to take specimen.
6 Test environment
Before the test, hold the sample adhesive tape roll in the test environment.
Make its state reach balance. The state conditioning time is not less than 24 h.
The test ambient temperature is 23 °C ± 1 °C. The relative humidity is 50% ±
5%.
7 Test process
7.1 Before each measurement, use appropriate solvent to clean the measuring
head. Adjust the dial thickness gauge to zero.
7.2 Place the specimen between the upper and lower planes of the measuring
head of the measuring instrument. Allow the adhesive side to face upwards.
During the test, slowly lower down the measuring head. Finally cover the
surface of the adhesive tape. After lowering down the upper measuring head
for 1 s, record the reading of the dial gauge, expressed in mm or μm, accurate
to 0.002 mm. For each specimen, measure 3 points at different positions. Take
the arithmetic mean of the 3 readings as the thickn...