GB/T 39024-2020 English PDF

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GB/T 39024-2020: Black leads for wood-cased pencils--Classification and diameters
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 39024-2020	114	Add to Cart	3 days	Black leads for wood-cased pencils--Classification and diameters	Valid

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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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