GB/T 2910.18-2009Textiles -- Quantitative chemical analysis -- Part 18: Mixtures of silk and wool or hair (method using sulfuric acid) (English PDF)

1 Scope

This Part of GB/T 2910 specifies a method, using sulfuric acid, to determine the percentage of silk, after removal of non-fibrous matter, in textiles made of binary mixtures of silk and wool or animal hair.

2 Normative references

The following standards contain the provisions which, through reference in this part of GB/T 2910, constitute the provisions of this Part. For dated references, subsequent amendments (excluding corrections) or revisions do not apply to this Part. However, the parties who enter into agreement based on this Part are encouraged to investigate whether the latest versions of these documents are applicable. For undated reference documents, the latest versions apply to this

Part.

GB/T 2910.1, Textiles - Quantitative chemical analysis - Part 1: General principles of testing (ISO 1833-1:2006, IDT)

3 Principle

The silk fibre is dissolved from a known dry mass of the mixture with 75 % (mass fraction) sulfuric acid. The residue is collected, washed, dried and weighed; its mass, corrected if necessary, is expressed as a percentage of the dry mass of the mixture. The percentage of silk is found by the difference.

NOTE: Wild silk, such as tussah silk, are not completely soluble in 75 % (mass fraction) sulfuric acid.

4 Reagents

Use the reagents described in GB/T 2910.1 together with those given in 4.1,

4.2 and 4.3 of this Part.

4.1 75% (mass fraction) sulfuric acid

Chinese Standards

This is an excerpt of the PDF (Some pages are marked off intentionally)

Full-copy PDF can be purchased from 1 of 2 websites:

nu SEARCH the standard ID, such as GB 4943.1-2022.

nu Select your country (currency), for example: USA (USD); Germany (Euro).

nu Full-copy of PDF (text-editable, true-PDF) can be downloaded in 9 seconds.

nu Tax invoice can be downloaded in 9 seconds.

nu Receiving emails in 9 seconds (with download links).

nu SEARCH the standard ID, such as GB 4943.1-2022.

nu Full-copy of PDF (text-editable, true-PDF) can be downloaded in 9 seconds.

nu Receiving emails in 9 seconds (with PDFs attached, invoice and download links).

Translated by: Field Test Asia Pte. Ltd. (Incorporated & taxed in Singapore. Tax ID: 201302277C)

Linkin: https://www.linkedin.com/in/waynezhengwenrui/

------ The End ------