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Issued by

General Administration of Quality Supervision, Inspection and Quarantine

Level / Type

National · Recommended

Issue date

September 26, 2010

Implementation date

August 1, 2011

Scope

GB/T 25271-2010 (OK-Own.) is available as an English-translated PDF.

GB/T 25271-2010 — This Standard specifies the classification, requirements, test methods, inspection rules and marks, package and storage of nitrocellulose coatings.

This Standard is applicable to modified coatings which take nitrocellulose as main film forming materials and are added with alkyd resin, modified rosin, and acrylic resin.

The products mainly apply to metal, plastic, wood and other surface protection and decoration. This Standard is not applicable to protection and decoration of wood product surface for interior decoration use (including factory coating).

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Document preview — GB/T 25271-2010

National Standard of the People's Republic of China

ICS: 87.040
Classification: G 51

Issued by: General Administration of Quality Supervision, Inspection and Quarantine

Foreword...3
1 Scope...4
2 Normative references...4
3 Product classification...5
4 Technical requirements...6
5 Test methods...7
6 Inspection rules...12
7 Marks, package and storage...13

Foreword

This Standard was proposed by China Petroleum and Chemical Industry

Federation.

This Standard shall be under the jurisdiction of National Standardization

Technical Committees (SAC/TC 5).

The drafting organizations of this Standard. CNOOC Changzhou coating

Chemical Research Institute, Shanghai Fu-chen Chemical Co., Ltd., Nanjing

Yangtze River Paint Co., Ltd., Zhejiang GTC Paint Industry Group Co., Ltd.,

Foshan Maydos Chemical Co., Ltd., China Paint ( Shenzhen ) Co., Ltd., Jiangsu

Elephant East Asia Paint Co., Ltd., Guangzhou Pearl River Chemical Industry

Group Co., Ltd., Shenzhen Song Hui Chemical Co., Ltd., and Sichuan

Dangerous Chemicals Quality Supervision and Inspection Institute.

Main drafters of this Standard. Liu Lin, Zhou Qionghui, Zhang Haojun, Qiu

Yuqing, Liu Xiangzhi, Zhu Huiming, Yang Shaowu, Cai Minzhao, Zhang Dingde

and Wang Xiaoyun.

Nitrocellulose coatings

1 Scope

This Standard specifies the classification, requirements, test methods,

inspection rules and marks, package and storage of nitrocellulose coatings.

This Standard is applicable to modified coatings which take nitrocellulose as

main film forming materials and are added with alkyd resin, modified rosin, and

acrylic resin. The products mainly apply to metal, plastic, wood and other

surface protection and decoration.

This Standard is not applicable to protection and decoration of wood product

surface for interior decoration use (including factory coating).

2 Normative references

The following standards contain the provisions which, through reference in this

Standard, constitute the provisions of this Standard. For dated references, the

subsequent amendments (excluding corrections) or revisions do not apply to

this Standard. However, the parties who enter into agreement based on this

Standard are encouraged to investigate whether the latest versions of these

documents are applicable. For undated reference documents, the latest

versions apply to this Standard.

GB/T 1722-1992 Color of varnishes, boiled oils and thinners

GB/T 1725-2007 Paints varnishes and plastics - Determination of non-

volatile-matter content (ISO 3251.2003, IDT)

GB/T 1726-1979 Methods of test for hiding power of paints

GB/T 1728-1979 Methods of test for drying time of coatings of paints and

putties

GB/T 1735-2009 Paints and varnishes - Determination of heat resistance

(ISO 3248.1998, Paints and varnishes - Determination of the effect of heat,

MOD)

GB/T 1762-1980 Test for after-tack of paint films

GB/T 1766-2008 Paints and Varnishes - Rating Schemes of Degradation of

Coats

GB 1922-2006 Petroleum solvents for paints and cleaning

GB/T 3186 Paints varnishes and raw materials for paints and varnishes -

Sampling (GB/T 3186-2006, ISO 15528.2000, IDT)

GB/T 6682 Water for analytical laboratory use - Specification and test

methods (GB/T 6682-2008, ISO 3696.1987, MOD)

GB/T 6753.1-2007 Paints varnishes and printing inks - Determination of

fineness of grind (ISO 1524.2000, IDT)

GB/T 8170 Rules of rounding off for numerical values & expression and

judgement of limiting values

GB/T 9271-2008 Paints and varnishes standard panels for testing (ISO

1514.2004, MOD)

GB/T 9274-1988 Paints and varnishes - Determination of resistance to

liquids (eqv ISO 2812.1974)

GB/T 9278 (GB/T 9278-2008, ISO 3270.1984, Paints and varnishes and their

raw materials - Temperatures and humilities for conditioning and testing, IDT)

GB/T 9286-1998 Paints and varnishes; Determination of resistance to liquids

(eqv ISO 2409.1992)

GB/T 9750 Marks for package of coating products

GB/T 9754-2007 Paints and varnishes - Determination of specular gloss of

non-metallic paint films at 20° 60°and 85° (ISO 2813.1994, IDT)

GB/T 13452.2-2008 Paints and varnishes - Determination of film thickness

(ISO 2808.2007, IDT)

GB/T 13491 General rule for packing of coatings

JB/T 7499-2006 Coated abrasives - Waterproof abrasive paper

3 Product classification

Nitrocellulose coating is classified into nitrocellulose primer and nitrocellulose

finish paint. And nitrocellulose finish paint is classified into varnish and paint.

5.3.1 Substrate processing

Unless otherwise agreed, steel plates, tin plates and glass plates for test use

shall comply with requirements in GB/T 9271-2008. Steel plate processing shall

be conducted in accordance with the provisions in 3.5 of GB/T 9271-2008. Tin

plate processing shall be conducted in accordance with the provisions in 4.3 of

GB/T 9271-2008. Glass plate processing shall be conducted in accordance with

the provisions in 7.2 of GB/T 9271-2008. Substrate material type and substrate

processing method agreed shall be indicated in the inspection report.

5.3.2 Preparation of test sample

Unless otherwise agreed, sample preparation shall be based on Table 3 and

determination of sample coating thickness shall be conducted according to the

provisions in GB/T 13452.2. When it uses different method for coating

preparation from the one stipulated in this Standard, it shall be indicated in the

inspection report.

Table 3 Preparation of test sample

Inspection item Substrate type

Substrate size

mm Coating requirements

Constructability

Coating

appearance

Tin plate 200×100×(0.2~0.3)

One layer of primer. (23±3) µm

Two layers of varnish. (30±5) µm (time

interval of each layer. 30 min)

Two layers of paint. (35±5) µm (time

interval of each layer. 30 min)

Conduct the test for coating appearance

after placing it for 48 h.

Adaptability to

finish paint

Steel

plate or

agreed

one

200×100×(0.2~0.3)

One layer of primer. (23±3) µm; the

thickness of supporting finish paint shall

be agreed; conduct the test after placing

it for 48 h.

Drying time Tin plate 120×50×(0.2~0.3)

One layer of primer. (23±3) µm

One layer of varnish. (15±3) µm

One layer of paint. (23±3) µm

Table 3 (continued)

Inspection

item Substrate type

Substrate size

mm Coating requirements

Cross cut

test Steel plate 120×50×(0.45~0.55)

One layer of primer. (23±3) µm; conduct

the test after placing it for 24 h.

adaptability to finish paint, it shall evaluate whether the finish paint is accessibly

applied on the primer at first. Then applying the finish paint for 48 h. Visually

observe it under natural sunlight, if there are no peeling, cracking, wrinkling,

shrinkage, spots or uneven gloss, it shall be evaluated as "no adverse effect on

finish paint".

5.14 Grinability

Bake it for 1 h at (60±2)°C. Use P400 (No.400) water sandpaper which complies

with the provisions of JB/T 7499-2006 to grind for 30 times. If the coating is

easy to be grinded as smooth surface, it shall be evaluated as "easy to grind".

5.15 Gloss

Conduct according to the provisions of GB/T 9754-2007.

5.16 After tack

5.16.1 Dry the varnish sample for 1 h under stipulated conditions. Put it into a

(80±2)°C oven and heat it for 30 min. Take the sample out. Place it for 1 h under

stipulated conditions. Conduct according to the provisions of GB/T 1762-1980.

5.16.2 Conduct according to the provisions of GB/T 1762-1980 for paint

sample.

5.17 Color bleeding

Spray white nitrocellulose coating of same category on the dried paint coating.

Place it for 30 min under stipulated conditions. Visually observe it under natural

sunlight, if the product for test has not bled into the white coating and caused

color change, it shall be evaluated as "no color bleeding".

5.18 Heat resistance

Conduct the determination of heat resistance according to the provisions of

GB/T 1735-2009. Heat the varnish sample in a (115~120)°C oven for 2 h. Heat

the paint sample in a (100~105)°C oven for 2 h. Take it out and place it for 1 h

under stipulated conditions before observe it.

5.19 Water resistance

5.19.1 Dry the varnish sample for 1 h under stipulated conditions. Heat it in a

(80±2)°C oven for 30 min. Take the sample out. Then place it for another 1 h

under stipulated conditions. Conduct it according to the immersion method of

GB/T 9274-1988. Immerse it into the grade three water that complies with GB/T

6682 for 18 h, and take it out. Make it recover for 2 h and examine the coating.

If there are no wrinkles, blistering, cracking, spalling, obvious discoloration,

clear gloss coating changes or other pathological phenomena to at least 2

samples out of 3, it shall be evaluated as "no abnormality".

5.19.2 For paint sample, conduct it according to the immersion method of

GB/T 9274-1988. If there are no wrinkles, blistering, cracking, spalling, obvious

discoloration, clear gloss coating changes or other pat...

......

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 13 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 3251.2003 · GB/T 1726-1979 · ISO 3248.1998 · GB/T 1762-1980 · ISO 15528.2000 · ISO 3696.1987 · GB/T 6753.1-2007 · ISO 1524.2000 · GB/T 9271-2008 · GB/T 9274-1988 · ISO 2812.1974 · ISO 3270.1984 · ISO 2409.1992 · ISO 2813.1994 · ISO 2808.2007 · GB/T 13491

Cited by

HG/T 2239-2012Epoxy ester primers

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