1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-21743-3 SANS 5780:2008Edition 3 SOUTH AFRICAN NATIONAL STANDARD Chemical damage to cotton fibres by laundry detergents Published by Standa
4、rds South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 5780:2008 Edition 3 Table of changes Change No. Date Scope Foreword This South African standard was approved by Nat
5、ional Committee StanSA SC 5140.01B, Detergents, polishes and other chemicals Detergents, soaps and cleaners, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This document was published in July 2008. This document supersedes SABS SM 780:19
6、84 (first revision). SANS 5780:2008 Edition 3 1 Chemical damage to cotton fibres by laundry detergents 1 Scope This standard specifies a method for the determination of the chemical damage to cotton fibres by laundry detergents. 2 Normative references The following referenced documents are indispens
7、able for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. Information on currently valid national and international standards can be obtained from Standard
8、s South Africa. SANS 5115, Fluidity of cotton and certain cellulosic man-made fibres in cuprammonium solution (modified method). SANS 5778, Redeposition index of laundry detergents. SANS 6081, Cleaning efficiency of low-foam laundry detergents. 3 Apparatus Washing device, as in SANS 6081, but capabl
9、e of maintaining the contents or its containers at boiling point. Measuring cylinder with a capacity of 1000 mL, graduated in millilitres. 4 Materials Test cloth, as in SANS 5778. SANS 5780:2008 Edition 3 2 5 Procedure 5.1 From the test cloth, cut two swatches, each of size 68 mm 88 mm, and identify
10、 each with indelible marking ink. 5.2 Switch on the washing device and set it to boiling point. 5.3 Weigh out 30,00 g of the test sample and dissolve it in 750 mL of distilled water. Transfer a 250 mL volume of the well-mixed solution into each of two containers of the washing device and add a test
11、cloth swatch to each container. 5.4 Close the containers, install them in the washing device, start the device and let it run for 5 min. Release the pressure in the containers by opening and closing them momentarily, and then wash for 6 h. Remove the containers from the washing device, open them and
12、 let them stand overnight. 5.5 Next morning, drain off and discard the used wash solutions and refill each of the containers with 250 mL of the test solution, freshly prepared as in 5.3 and repeat the procedure given in 5.4. 5.6 Repeat 5.5 three more times. 5.7 After the 30 h total washing time, rin
13、se the swatches (after squeezing them by hand) four times in 1 L volumes of distilled water at ambient temperature, stirring each time for 1 min with a glass rod. 5.8 Then use SANS 5115 to determine the fluidity of the cotton fibres in each swatch. 6 Test report Report the following information: a) all the data needed to identify the laboratory sample tested; b) confirmation that the test was carried out in accordance with this standard; c) any deviation from this standard; and d) the result of the fluidity of the cotton fibres, in rhe. Standards South Africa
