GB/T 1766-2008 PDF English
US$85.00 · In stock · Download in 9 secondsGB/T 1766-2008: Paints and varnishes -- Rating schemes of degradation of coats 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 1766: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 1766-2008 | English | 85 |
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Paints and varnishes -- Rating schemes of degradation of coats
| Valid |
| GB/T 1766-1995 | English | 479 |
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4 days
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Paint and varnish--Rating schemes of degradation of coats
| Obsolete |
| GB 1766-1979 | English | RFQ |
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3 days
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Method of evaluation of degradation (both exterior and accelerated)of paint films
| Obsolete |
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GB/T 1766-2008: Paints and varnishes -- Rating schemes of degradation of coats---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/GBT1766-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 87.040
G 50
Replacing GB/T 1766-1995, GB/T 14826-1993
Paints and Varnishes –
Rating Schemes of Degradation of Coats
Issued on. JUNE 04, 2008
Implemented on. DECEMBER 1, 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 General rules and rating method... 5
4 Single-item rating grade... 6
5 Comprehensive rating grade... 15
6 Inspection precautions... 1
7 Test report... 1
Foreword
This Standard replaces GB/T 1766-1995 Paints and Varnishes - Rating Schemes of
Degradation of Coats and GB/T 14826-1993 Determination Method and Rating of
Pulverization Degree of Paints and Coating.
The major technical differences of this Standard, compared with GB/T 1766-1995 and
GB/T 14826-1993, are as follows.
- This Standard combines the contents of the two standards, and modifies and
improves some of the methods.
- In color grade rating method, for visual colorimetric, add the gray card rating
discoloration content.
- Rating method for pulverization degree is modified to be the adhesive tape paper
method in ISO 4628-6.2007 OR the swan flannelette method in ISO 4628-7.2003.
This Standard was proposed by China Petroleum and Chemical Industry Association.
This Standard shall be under the jurisdiction of National Coating and Paint Standardization
Technical Committee.
Drafting organizations of this Standard. China National Offshore Oil Corporation
Changzhou Coating Chemical Industry Research Institute, Kunshan Shiming Science and
Technology Development Co., Ltd., and Atlas Material Experiment Technology Group Co.,
Ltd.
Main drafters of this Standard. Ji Xiaopei, Zhang Ping, Shi Yilei, and Zeng Cheng.
GB/T 1766 was first-time issued in 1979, and fir-time revised in 1995.This is the
second-time to combine and revise. GB/T 14826 was first-time issued in 1993, and this is
the first-time to combine and revise.
Paints and Varnishes –
Rating Schemes of Degradation of Coats
1 Scope
This Standard specifies the general principles of the rating of coating aging, rating method
of aging single-item index, and comprehensive rating method of decorative coating and
protective coating aging.
This Standard applies to rating of coating aging performance (natural aging and artificial
accelerated aging).
2 Normative references
The articles contained in the following documents have become part of this Standard
when they are quoted herein. For the dated documents so quoted, all the modifications
(excluding corrections) or revisions made thereafter shall not be applicable to this
Standard. For the undated documents so quoted, the latest editions shall be applicable to
this Standard.
GB 250 Gray Scale for Assessing Change in Colour (GB 250-1995, ISO 105/A02.1993,
IDT)
GB/T 9754 Paints and varnishes - Determination of specular gloss of non-metallic paint
films at 20°, 60°and 85°(GB/T 9754-2007, ISO 2813.1994, IDT)
GB/T 9761 Paints and varnishes - Visual comparison of the colour of paints (GB/T
9761-2008, ISO 3668.1998, IDT)
GB/T 11186.2 Methods for measuring the colour of paint films - Part 2.Colour
measurement (GB/T 11186.2-1989, eqv ISO 7724-2.1984)
3 General rules and rating method
3.1 Classification
This Standard uses figures 0 to 5 to rate the damage degree and quantity. “0” shows no
damage, and “5” shows serious damage.
3.2.Rating of damage degree, quantity and size
3.2.1 Rate visible uniform damage on the coating surface, and rate with damage change
degree, as shown in Table 1.
3.2.2 Rate non-continuous or local irregular damage, and rate with damage quantity, as
shown in Table 2.
3.3 Expression method
The expression method shall include the following content.
Damage type. grade of damage degree or damage quantity. If it is necessary to indicate
damage size grade, it shall be shown in the bracket and add letter “S” before the grade.
4 Single-item rating grade
4.1 Gating of light loss grade
Gloss change degree before and after aging shall be inspected by naked eyes; determine
the gloss before and after aging in according with GB/T 9754; calculate the light loss; the
grade is shown in Table 4.
4.2 Rating of colour changing degree
4.2.1 Instrument determination method
Total colour difference value (∆E*) among sample plates shall be determined and
calculated in accordance with GB/T 11186.2 and GB/T 11186.3 before and after aging; see
4.4 Rating of cracking grade
4.4.1 The cracking grade of film shall be expressed by its cracking quantity and cracking
size. See Table 8 and Table 9 for cracking quantity grade and cracking size grade.
4.5 Rating of blister grade
4.5.1 Blister grade of film is expressed by film blister density (see Table 10) and blister
size (see Table 11).
4.6 Rating of rusting grade
4.6.1 The rusting grade of film is expressed by rust spot (stain) quantity (see Table 12)
and rust spot size (see Table 13) on the film surface.
4.7 Rating of peeling grade
4.7.1 The peeling grade of film is expressed by film-peeling relative area (see Table 14)
and peeling exposed area size (see Table 15).
5 Comprehensive rating grade
Assess the comprehensive grade of film ageing in accordance with the single-item
damage grade in aging test process; it is divided into six grades - 0, 1, 2, 3, 4, 5 and 6,
which represent excellent, good, medium, acceptable, bad and worse of film aging
resistance performance respectively.
5.1 See Table 22 for decorative film comprehensive aging performance rating.
6 Inspection precautions
6.1 Damages caused by edges of sample plate, 5 mm around the plate hole and foreign
factors shall not be calculated.
6.2 Record each type of damage phenomenon.
6.4 If the film has several damages phenomenon, it shall be rated according to the most
serious item when conducting the comprehensive grade rating.
7 Test report
The test report shall at least include the following contents.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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