GB 21027-2020 PDF English
US$305.00 · In stock · Download in 9 secondsGB 21027-2020: Request in common use of security for student’s articles Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB 21027: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 21027-2020 | English | 305 |
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Request in common use of security for student’s articles
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| GB 21027-2007 | English | 85 |
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Request in common use of security for student′s articles
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Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB 21027-2020
GB 21027-2020: Request in common use of security for student’s articles---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/GB21027-2020
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
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
GB 6675.4-2014 Safety of toys - Part 4.Migration of certain elements
GB/T 7974 Paper, board and pulps - Measurement of diffuse blue
reflectance factor - D65 brightness (Diff/Geometry, Outdoor daylight
conditions)
GB/T 13354 Test method for density of adhesives in fluid form - Method of
weight cup
3 Terms and definitions
The following terms and definitions apply to this document.
3.1 Student's articles
Supplies for students under 14 years old (including 14 years old), for the
purposes of study.
4 Requirements
4.1 Limits of migratable elements
The content of migratable elements, in student's article, shall not exceed the
maximum limit requirements of the corresponding elements in Table 1.In the
maximum limit of migratable elements, the printed, brushed, coated parts of
accessible student's articles are exempted, when specimen, which is obtained
from a single sample, is less than 10 mg.
4.2 Limits of harmful substances in liquid glue, solid glue, paste
The maximum limit of harmful substances in liquid glue, solid glue, paste shall
not exceed the requirements in Table 2.
4.3 Limits of harmful substances in correction fluid, correction tape,
correction stickers, correction pens
4.3.1 The content of benzene shall not exceed 10 mg/kg.
4.4 Limits of harmful substances in fabrics and accessories used in
school bags and pencil bags
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
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.
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.
5.3 Limits of harmful substances in correction fluid, correction tape,
correction stickers, correction pens
5.3.1 The determination of benzene content in correction products shall be
carried out, in accordance with Appendix C.
5.4 Limits of harmful substances in fabrics and accessories used in
school bags and pencil bags
5.4.1 The determination of free formaldehyde content in fabrics and
accessories, which are used in school bags and pencil bags, shall be carried
out in accordance with GB/T 32606.
5.5 Limits of phthalate plasticizers in accessible plastic parts
The content of phthalate plasticizer, in accessible plastic parts, shall be
determined, in accordance with GB/T 22048.
5.6 Limits of free formaldehyde in colored clay
The determination of free formaldehyde content, in colored clay, shall be carried
out, in accordance with GB/T 32606.
5.7 Brightness (whiteness) of workbook
The brightness (whiteness) of the schoolwork books shall be determined, in
accordance with the provisions of GB/T 7974.
5.8 Pen sleeve safety
5.9 Edge, tip
5.9.1 The test of sharp edge shall be conducted, in accordance with 5.8 of GB 6675.2-2014.
5.9.2 The test of sharp tip shall be carried out, in accordance with 5.9 of GB 6675.2-2014.
6 Markings
6.1 The markings shall be clear, easy to read, durable.
6.2 For a all products, which are covered by this standard (see Appendix G),
they shall be marked on the product or its smallest package or its sales package,
as follows "This product is suitable for students under 14 years old (including
14 years old)" or "Applicable age.
6.3 For the student's articles, which require warning signs or warning
instructions, they shall be marked.
Appendix A
(Normative)
List of harmful aromatic amines
The list of harmful aromatic amines, in student's articles, is as shown in Table A.1.
Appendix B
(Informative)
Design guidelines for the ventilation area of the pen sleeve
A continuous air channel, which has a cross-sectional area of at least 6.8 mm2,
can extend to a length of 2 mm, at both ends of the pen sleeve. If the area is
not completely enclosed, use a thin cotton thread, to tightly surround any part
perpendicular to the main axis OR at the largest diameter; the resulting
containment area is the cross-sectional area of the continuous air channel (see
Figure B.1).
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 specimen solution.
C.3 Reagents
C.4 Instruments
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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