GB 21027-2020 English PDF (GB21027-2020)

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GB 21027-2020: Request in common use of security for student’s articles
GB 21027-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 97.180
Y 50
Replacing GB 21027-2007
Request in common use of security for student's
articles
ISSUED ON: JULY 23, 2020
IMPLEMENTED ON: FEBRUARY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 6 
2 Normative references ... 6 
3 Terms and definitions ... 7 
4 Requirements ... 7 
5 Test method ... 10 
6 Markings ... 13 
Appendix A (Normative) List of harmful aromatic amines ... 14 
Appendix B (Informative) Design guidelines for the ventilation area of the pen
sleeve ... 15 
Appendix C (Normative) Determination of benzene content in adhesives and
correction products - Gas chromatography ... 17 
Appendix D (Normative) Determination of toluene and xylene content in
adhesives - Gas chromatography ... 20 
Appendix E (Normative) Determination of total volatile organic compounds in
adhesives ... 24 
Appendix F (Normative) Air flow test ... 28 
Appendix G (Informative) Examples of student's articles catalogues and
corresponding requirements ... 30 
Request in common use of security for student's
articles
1 Scope
This standard specifies the requirements, test methods, marking of student's
articles.
This standard applies to learning articles, which are used by students under the
age of 14 (including 14 years old), including watercolor paints, crayons, oil
pastels, colored clay, erasers, correction fluids, correction tapes, correction
stickers, correction pens, liquid glues, solid glue, paste, watercolor pen,
fountain pen, ink ballpoint pen, neutral ink ballpoint pen, water-based ink
ballpoint pen, marker pen, whiteboard pen, highlighter, pencil, mechanical
pencil, ink, lead core, plotter ruler (straightedge, triangle ruler, scale ruler,
protractor, drawing template, excluding T-square), student compasses,
schoolwork books, book covers, school bags, pencil bags, stationery scissors,
stationery boxes, manual pencil sharpeners, pencil sharpeners, utility knifes,
etc.
This standard does not apply to stationery products, which are intended for
students over 14 years old AND are used by professionals.
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) is applicable to this standard.
GB/T 606 Chemical reagent - General method for the determination of water
- Karl Fischer method
GB/T 1033.1 Plastics - Methods for determining the density of non-cellular
plastics - Part 1: Immersion method liquid pycnometer method and titration
method
GB/T 2793 Test method for nonvolatile content of adhesives
GB 6675.2-2014 Safety of toys - Part 2: Mechanical and physical properties
4.4.2 Decomposable hazardous aromatic amine dyes are prohibited. The
content of each hazardous aromatic amine shall not exceed 20 mg/kg. See
Appendix A for the list of hazardous aromatic amines.
4.5 Limits of phthalate plasticizers in accessible plastic parts
The total content of three phthalates: dihexyl phthalate (DEHP), dibutyl
phthalate (DBP), butyl benzyl phthalate (BBP), in accessible plastic parts, shall
not exceed 1000 mg/kg. For a single sample, if the sampling size of a single
material is less than 10 mg, it can be exempted.
4.6 The limit of free formic acid in colored clay
The content of free formaldehyde, in the colored clay, shall not exceed 500
mg/kg.
4.7 Brightness (whiteness) of schoolwork books
The brightness (whiteness) of the workbook shall not be greater than 85%.
4.8 Pen sleeve safety
4.8.1 General requirements
The pen sleeve shall meet at least one requirement of 4.8.2 or 4.8.3.
4.8.2 Pen sleeve size
When the pen sleeve enters the ring gauge, which has a diameter of
mm AND a thickness of not less than 19 mm, vertically along the axis, under its
own weight, the length of the pen sleeve, which does not enter the ring gauge,
shall be at least 5 mm.
Note: Pen sleeves, which comply with the requirements of this article, are considered
large enough to not pose a risk of inhalation.
4.8.3 Air flow of pen sleeve
When the maximum pressure difference, at room temperature, is 1.33 kPa, the
air flow through the pen sleeve shall be at least 8 L/min,
Note 1: When the pen sleeve relies on internal ventilation, a round hole which has a
cross-sectional area of about 3.4 mm2 can meet this requirement, BUT multiple small
holes may require a larger total cross-sectional area.
Note 2: Appendix B gives guidelines for pen sleeves relying on external ventilation.
Note 3: Pen sleeves, which comply with the requirements of this article, are considered
not to pose a suffocation hazard.
4.9 Edge, tip
4.9.1 The top of stationery scissors and blades shall be arc tops, not sharp
points.
4.9.2 For stationery scissors, manual pencil sharpeners, pencil sharpeners,
student compasses, plotter rulers, utility knives, etc., if there are functional
sharp edges and sharp points, due to indispensable functionality, it shall provide
warning instructions. There shall be no other non-functional sharp edges and
sharp points.
Note: The writing tip of pencils and similar drawing tools is not considered a dangerous
sharp tip.
4.9.3 The accessible edges, corners or parting lines of stationery boxes, etc.
shall not have sharp burrs, sharp tips or overflows, OR they shall be protected,
so that they cannot be touched.
4.9.4 For the accessible edges of student's articles, including holes and grooves,
they shall not have dangerous burrs or beveled edges, OR use them as folded
edges, curled edges, or formed of curved edges, OR be protected with
permanent protective parts or coatings.
4.9.5 The accessible ends of exposed bolts or threaded rods shall not have
exposed sharp edges or burrs, OR their ends shall be covered with smooth nuts,
so that sharp edges and burrs cannot be touched.
5 Test method
5.1 Limits of migratable elements
The determination of the content of migratable elements shall be carried out, in
accordance with the provisions of GB 6675.4-2014.
5.2 Limits of harmful substances in liquid glue, solid glue, paste
5.2.1 The determination of free formaldehyde content in the adhesive shall be
carried out, in accordance with the provisions of GB/T 32606.
5.2.2 The determination of the benzene content in the adhesive is carried out,
in accordance with Appendix C.
5.2.3 The determination of toluene and xylene content in the adhesive is carried
out, in accordance with Appendix D.
Appendix C
(Normative)
Determination of benzene content in adhesives and correction
products - Gas chromatography
C.1 Overview
This Appendix specifies the determination method of benzene content, in
adhesives and correction products for students.
C.2 Principle
After the specimen is diluted with an appropriate solvent, use a micro-syringe,
to directly inject the diluted specimen solution into the sampling device. Use the
carrier gas to bring it into the chromatographic column, where it is separated
into the corresponding components. Use the hydrogen flame ionization detector,
to detect and record the chromatogram. Use the external standard method, to
calculate the benzene content in the...