Powered by Google www.ChineseStandard.net Database: 189759 (16 Jun 2024)

GB 21027-2007 PDF in English


GB 21027-2007 (GB21027-2007) PDF English
Standard IDContents [version]USDSTEP2[PDF] delivered inName of Chinese StandardStatus
GB 21027-2007English85 Add to Cart 0-9 seconds. Auto-delivery. Request in common use of security for student′s articles Obsolete
GB 21027-2020English305 Add to Cart 0-9 seconds. Auto-delivery. Request in common use of security for student’s articles Valid
Newer version: GB 21027-2020
PDF Preview

Standards related to: GB 21027-2007

GB 21027-2007: PDF in English

GB 21027-2007
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 97.180
Y 50
Request in common use of
security for student’s articles
ISSUED ON. JUNE 07, 2007
IMPLEMENTED ON. APRIL 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 Requirements... 5
4 Test methods ... 7
5 Inspection rules ... 8
6 Markings and instructions ... 9
Annex A (normative) Determination of free formaldehyde content in adhesives
- Acetylacetone spectrophotometric method ... 10
Annex B (normative) Determination of benzene content in adhesives - Gas
chromatographic method ... 14
Annex C (normative) Determination of toluene and xylene content in adhesives
- Gas Chromatographic method ... 17
Annex D (normative) Determination of the content of total volatile organic
compounds in adhesives ... 20
Annex E (normative) Determination of air circulation ... 22
Foreword
All technical contents of this Standard are mandatory.
Annexes A, B, C, D, and E of this Standard are normative.
This Standard is proposed by China Light Industry Federation.
This Standard is under the jurisdiction of National Standardization Center of Stationery
and Sporting Goods.
Drafting organizations of this Standard. Shanghai Siic Marie Painting Materials Co.,
Ltd., Fujian New Generation Industrial Co., Ltd., Ningbo Songhe Stationery Co., Ltd.,
Tianjin Global Technology Packaging Paper Co., Ltd., Shanghai Genvana Industrial
Development Co., Ltd., Qingdao Changlong Stationery Co., Ltd., Ruhe Stationery
(Shenzhen) Co., Ltd.
Main drafters of this Standard. Wang Yuren, Zhu En, Zheng Chengqiang, Chen
Xiongfei, Zheng Ping, Fang Hanben, Kang Dengkui, Zhuang Hong.
This Standard is issued for the first time.
Request in common use of
security for student’s articles
1 Scope
This Standard specifies the safety requirements, test methods, inspection rules,
marking and instructions of student’s articles.
This Standard is applicable to student’s articles such as watercolor paints, crayons, oil
pastels, finger paints, plasticine, erasers, correction products (correction fluid,
correction tape, correction pen), adhesives, watercolor pens, writing pens, marker
pens, rulers for drawing, notebooks, school bags, pencil cases, hand scissors,
stationery cases, pencil sharpeners for underage students.
2 Normative references
The following standards contain provisions which, through reference in this Standard,
constitute provisions of this Standard. For dated reference, subsequent amendments
to (excluding corrections to), or revisions of, any of these publications do not apply.
However, the parties to agreements based on this Standard are encouraged to
investigate the possibility of applying the most recent editions of the standards. For
undated references, the latest edition of the normative document referred to applies.
GB/T 601-2002 Chemical reagent - Preparations of standard volumetric solutions
GB/T 606-2003 Chemical reagent - General method for the determination of water
- Karl Fischer method (neq ISO 6353-1.1982)
GB/T 2793-1995 Test method for nonvolatile content of adhesives
GB/T 2912.1-1998 Textiles - Determination of formaldehyde - Part 1. Free and
hydrolyzed formaldehyde (Water extraction method) (ISO/FDIS 14184-1.1997,
EQV)
GB 5296.5-2006 Instructions for use of products of consumer interest - Part 5. Toys
GB 6675-2003 National safety technical code for toys
GB/T 7974-2002 Paper, board and pulp - Measurement of brightness -
Diff/Geometry (ISO 2470.1999, NEQ)
be no dangerous burrs or oblique sides, or they shall be folded, curled or formed to be
curved edges, or protected by permanent protectors or coating.
3.8.5 Touchable ends of exposed bolts or threaded rods shall be no exposed sharp
edges or burrs, or the ends thereof shall be covered with smooth nuts so that sharp
edges and burrs are protected from being touched.
4 Test methods
4.1 Determination of maximum limit of migratable elements is carried out according to
the specifications of Annex C of GB 6675-2003. The analysis correction coefficient of
each element is in accordance with Table C.2 of GB 6675-2003; 1.1.1-trichloroethane
is changed to n-heptane.
4.2 Determination of benzene content and chlorinated hydrocarbon content of organic
solvents in correction products is carried out according to the method specified in GB/T
9722-2006.
4.3 Determination of limits of harmful substances in adhesives.
4.3.1 Determination of free formaldehyde content in adhesives is carried out according
to Annex A.
4.3.2 Determination of benzene content in adhesives is carried out according to Annex
B.
4.3.3 Determination of toluene and xylene content in adhesives is carried out according
to Annex C.
4.3.4 Determination of total volatile organic content in adhesives is carried out
according to Annex D.
4.4 Determination of formaldehyde content in fabrics and accessories used for school
bags and pen bags is carried out according to the specifications of GB/T 2912.1-1998.
4.5 Determination of brightness (whiteness) of notebooks is carried out according to
the specifications of GB/T 7974-2002.
4.6 Safety of capping
4.6.1 Size of cap
Measure with an annular gauge with a diameter of 16ି଴ା଴.଴ହ mm.
4.6.2 Ventilation area of cap
Annex A
(normative)
Determination of free formaldehyde content in adhesives - Acetylacetone
spectrophotometric method
A.1 Scope
This method specifies the method for the determination of free formaldehyde content
in adhesives for students.
This method is applicable for adhesives for students with free formaldehyde content
greater than 0.005 %.
A.2 Principle
The water-based adhesive is dissolved in water, and the solvent-based adhesive is
first dissolved in ethyl acetate and then dissolved in water. The free formaldehyde
dissolved in water is distilled off with water under acidic conditions. In the acetic acid-
ammonium acetate buffer solution with pH = 6, the formaldehyde reacts with
acetylacetone in the distillate, and the stable yellow compound is rapidly produced
under the boiling water bath. After cooling, the absorbance is measured at 415. 40nm.
The free formaldehyde content in the sample is calculated according to the standard
curve.
A.3 Reagents
Unless otherwise stated, only the reagents identified as analytical reagents and
distilled or deionized water or water of comparable purity are used in the analysis.
A.3.1 Ammonium acetate.
A.3.2 Glacial acetic acid. ρ = 1.055 g/mL.
A.3.3 Acetylacetone. ρ = 0.975 g/mL. Acetylacetone solution. 0.25 % (volume fraction).
WEIGH 25 g of ammonium acetate (A.3.1); ADD a small amount of water to dissolve;
ADD 3 mL of glacial acetic acid (A.2.3) and 0.25 mL of acetylacetone (A.3.3); MIX and
then add water to adjust pH to 6.0. The solution is adjusted to pH 2 ~ pH 5 for storage,
and can be stable for a month.
A.3.4 Hydrochloric acid solution. 1 + 5 (V + V).
A.3.5 Sodium hydroxide solution. 30 g/100 mL.
A.3.6 Iodine (I2). Iodine solution. c(l2) = 0.1mol/L, prepare according to GB/T 601-2002.
INSTALL the distillation device; DISTILL in an oil bath, STOP the distillation until the
distillate is 20mL. TRANSFER the distillate into a 250-mL volumetric flask; DILUTE to
the scale with water. TAKE 10 mL of distillate in a 25-mL volumetric flask; ADD 5 mL
of acetylacetone solution (A.3.3); DILUTE to the scale with water; SHAKE well. PLACE
it in boiling water for 3 mm; REMOVE and cool to room temperature. MEASURE its
absorbance.
A.5.2.2 Solvent-based adhesives
WEIGH 5.0 g of the sample (accurate to 0.1 mg); PLACE in a 500-mL distilled flask;
ADD 20 mL of ethyl acetate (A.3.11) to dissolve; ADD 250 mL of water; ADD 5 mL of
phosphoric acid (A.3.10); SHAKE well.
INSTALL the distillation device; DISTILL in an oil bath, STOP the distillation until the
distillate is 20mL. TRANSFER the distillate into a 250-mL volumetric flask; DILUTE to
the scale with water. TAKE 10 mL of distillate in a 25-mL volumetric flask; ADD 5 mL
of acetylacetone solution (A.3.3); DILUTE to the scale with water; SHAKE well. PLACE
it in boiling water for 3 mm; REMOVE and cool to room temperature. MEASURE its
absorbance.
A.6 Results presentation
The concentration of formaldehyde in the sample solution is read directly from the
standard curve.
Calculate the content of free formaldehyde X in the sample according to equation (A.2).
where.
X - the content of free formaldehyde, in grams per kilogram (g/kg);
ct - the concentration of formaldehyde in the sample solution read from the standard
curve, in micrograms per milliliter (μg/mL);
cb - the concentration of formaldehyde in t...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.