GB/T 1740-2007 PDF English
US$115.00 · In stock · Download in 9 secondsGB/T 1740-2007: Determination of resistance to heat and humidity of paint films Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 1740: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 1740-2007 | English | 115 |
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Determination of resistance to heat and humidity of paint films
| Valid |
| GB/T 1740-1979 | English | 199 |
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Methods of test for resistance to heat and humidity of paint films
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 1740-2007
GB/T 1740-2007: Determination of resistance to heat and humidity of paint films---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/GBT1740-2007
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 87.040
G 50
GB/T 1740-2007
Replacing GB/T 1740-1979 (1989)
Determination of resistance to heat and humidity of paint
films
Issued on: SEPTEMBER 11, 2007
Implemented on: APRIL 01, 2008
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
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 4
4 Reagents... 5
5 Apparatus... 5
6 Sampling... 5
7 Test panels... 5
8 Test procedures... 6
9 Evaluation of test results... 6
10 Test report... 7
Determination of resistance to heat and humidity of paint
films
1 Scope
This Standard specifies the test method for the resistance to high temperature and high
humidity environments of paints, varnishes and related coatings.
This Standard applies to the determination of resistance to heat and humidity of paint
films.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 1765 Method of producing of paint films for testing heat and humidity
resistance, salt-fog resistance and accelerated weathering
GB/T 1766 Paint and varnish - Rating schemes of degradation of coats (GB/T 1766-
1995, neq ISO 4628.1980)
GB/T 3186-2006 Paints varnishes and raw materials for paints and varnishes -
Sampling (ISO 15528.2000, IDT)
GB/T 6682 Water for laboratory use - Specifications (GB/T 6682-1992, neq ISO
3696.1987)
GB/T 9271 Paints and varnishes - Standard panels for testing (GB/T 9271-1988, eqv
ISO 1514.1984)
GB/T 13452.2 Paints and varnishes - Determination of film thickness (GB/T
13452.2-1992, eqv ISO 2808.1974)
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1
resistance to heat and humidity
Ability of paint films to withstand high temperature and high humidity environments.
4 Reagents
The water shall meet the purity requirements of GB/T 6682 and shall be at least Grade
3 water.
5 Apparatus
A temperature and humidity chamber meeting the test conditions.
6 Sampling
In accordance with the provisions of GB/T 3186-2006, take representative samples of
the test product (or each product in the composite coating system).
7 Test panels
7.1 Materials and dimensions
Unless otherwise specified, use substrates meeting the requirements of GB/T 9271, with
dimensions of approximately 150 mm × 70 mm × 1 mm.
7.2 Preparation and coating of test panels
Unless otherwise specified, prepare each substrate in accordance with the provisions of
GB/T 9271.
Unless otherwise specified or agreed upon, coat the product or system under test in
accordance with the provisions of GB/T 1765.
Unless otherwise specified, the test panels may be edge-sealed and back-sealed with
the product or system under test.
If the coating on the back and edges of the test panels is different from that of the test
product, it shall exhibit better resistance to heat and humidity than the test product.
8 Test procedures
8.1 The test panels are suspended vertically on a shelf, with the fronts of the test panels
not allowed to touch each other. The shelf is placed in a temperature and humidity
chamber pre-set to a temperature of (47 ± 1) °C and a relative humidity of (96 ± 2) %.
Other agreed-upon temperatures and humidity levels may be used. The test time will
begin when the temperature and humidity reach the set values. No condensation shall
form on the surface of the test panels during the test.
8.2 Inspect once after 48 h of continuous testing. After two inspections, inspect every
72 h. After each inspection, the test panels shall be changed in position.
9 Evaluation of test results
Test results are evaluated in accordance with the relevant provisions of GB/T 1766.The
following two evaluation methods may be used as needed.
9.1 Evaluate the test panels for rust, blistering, discoloration, cracking, or other damage
respectively.
9.2 Evaluate the comprehensive damage level according to Table 1.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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