GB/T 24331-2009 English PDF

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GB/T 24331-2009: Chrome powder for tanning
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 24331-2009	279	Add to Cart	3 days	Chrome powder for tanning	Valid

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Basic data

Standard ID: GB/T 24331-2009 (GB/T24331-2009)
Description (Translated English): Chrome powder for tanning
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: Y45
Classification of International Standard: 59.140.10
Word Count Estimation: 12,156
Date of Issue: 2009-09-30
Date of Implementation: 2010-02-01
Quoted Standard: GB/T 19940; QB/T 2412-1998
Regulation (derived from): National Standard Approval Announcement 2009 No.10 (Total No.150)
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary: This standard specifies the use of powdered chrome leather tanning industry product classification, requirements, test methods, inspection rules and signs, packaging, transport and storage. This standard applies to re -ming sodium -based raw materials, such as glucose or sulfur dioxide reduction, adding additives into the powder made ??of chrome tanning agent.

GB/T 24331-2009: Chrome powder for tanning

---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.
Chrome powder for tanning ICS 59.140.10 Y45 National Standards of People's Republic of China Powdered tanning chrome tanning agent Posted 2009-09-30 2010-02-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

The standard proposed by China National Light Industry Council. This standard by the National Leather Industry Standardization Technical Committee (SAC/TC252) centralized. This standard was drafted. Brother Technology Co., Ltd., China Leather and Footwear Industry Research Institute. The main drafters of this standard. Xiade Bing, Chiang Kai Shen Lili. Powdered tanning chrome tanning agent

1 Scope

This standard specifies the leather industry powdered chrome tanning product classifications, requirements, test methods, inspection rules and signs, packaging, transportation, Storage. This standard is applicable to sodium dichromate-based raw materials, such as sulfur dioxide or glucose reduction, adding the additives made of powdered chromium Tanning agent.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 19940 powdered chrome tanning agents Determination of hexavalent chromium ions QB/T 2412-1998 General technical leather chemicals

3 Product Categories

Products according to the different types of additives added and application effect were divided into standard, masking type, cross-linked masking, masking self-alkalizing type Four categories.

4 Requirements

Shall comply with the provisions in Table 1. Table 1 Requirements No. Item index Standard type masked masked masked self-crosslinking alkaline type 1 basic chromium sulfate (calculated as Cr2O3) /% ≥24.0 ≥23.0 ≥22.0 ≥19.0 2 Cr (Ⅵ)/(mg/kg) ≤2.0 3 basicity (B) /% 33 ± 2 34 ± 2 39 ± 2 - 4 pH 2.0 ~ 4.0 2.0 ~ 4.0 2.5 ~ 4.0 2.5 ~ 4.5 5 Water Insoluble /% ≤0.5 - 6 Fe/(mg/kg) ≤100.0 7 Hg/(mg/kg) ≤0.1 8 As/(mg/kg) ≤1.0 9 Pb/(mg/kg) ≤1.0

5 Test methods

Sampling, testing General shall conform to QB/T 2412-1998 in Chapter 3 and Chapter 4. Unless otherwise indicated, only in the analysis Confirm using analytical grade reagents and distilled or deionized water or equivalent purity. ......

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