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GB/T 39024-2020: Black leads for wood-cased pencils--Classification and diameters
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| GB/T 39024-2020 | English | 114 |
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Black leads for wood-cased pencils--Classification and diameters
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GB/T 39024-2020
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Basic data | Standard ID | GB/T 39024-2020 (GB/T39024-2020) | | Description (Translated English) | Black leads for wood-cased pencils--Classification and diameters | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Y50 | | Classification of International Standard | 97.180 | | Word Count Estimation | 6,611 | | Date of Issue | 2020-07-21 | | Date of Implementation | 2020-07-21 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 39024-2020: Black leads for wood-cased pencils--Classification and diameters---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Black leads for wood-cased pencils--Classification and diameters
ICS 97.180
Y50
National Standards of People's Republic of China
Classification and diameter of wood pencil black lead core
(ISO 9180.1988, IDT)
2020-07-21 released
2020-07-21 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
The translation method used in this standard is equivalent to ISO 9180.1988 "Classification and Diameter of Wooden Pencil Black Lead".
This standard was proposed by the China National Light Industry Council.
This standard is under the jurisdiction of the National Pen Standardization Technical Committee (SAC/TC378).
Drafting organizations of this standard. Shanghai Institute of Pen Industry, China First Pencil Co., Ltd., Anshuo Stationery (Shanghai) Co., Ltd.
the company.
The main drafters of this standard. Chen Jingqiang, Wang Yongzhong, Wang Dingli.
Classification and diameter of wood pencil black lead core
1 Scope
This standard specifies the classification and diameter of the black lead core of wooden pencil pencils.
2 Terms and definitions
The following terms and definitions apply to this document.
2.1
Blacklead
Containing carbon (such as graphite) and adhesive, the resulting black stitches are erasable solid writing materials.
2.2
Hardnessdegree
Represents the classification level with increasing hardness from 6B to 9H, and increasing stitch concentration from 9H to 6B.
Note. There is no scientific definition of hardness level.
2.3
Wood-casedpencil
A hand-held writing tool with a lead core fixed in the barrel made of wood and capable of withstanding the force of writing.
3 categories
Lead cores are divided into the following 17 types according to their hardness levels.
9H, 8H, 7H, 6H, 5H, 4H, 3H, 2H, H, F, HB, B, 2B, 3B, 4B, 5B and 6B.
4 diameter
The diameter of the lead core should meet the requirements of Table 1.
Table 1 Diameter
Hardness grade (see 2.2) Lead core diameter/mm
9H, 8H, 7H, 6H, 5H, 4H, 3H, 2H, H ≥1.8
F, HB, B, 2B, 3B, 4B, 5B, 6B ≥2.0
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