AATCC LP3-2018e Laboratory Procedure for Transfer of Free Permethrin from Textile Surfaces Developed in 2018 by AATCC Commit- another surface (ASTM D4850) teeRA49;editorially revised 2019. 5.Safety Precautions Foreword NOTE: These safety precautions are for informationpurposes only.The pre- This laboratory procedure was origi- cautions areancillary tothetestingproce nally developed as a method for transfer, dures and are not intended to be all inclu- extraction,and analysis of “freeper- sive. It is the user's responsibility to use methrin insecticide. Because specific safeandpropertechniquesinhandling analysis methods vary among equipment materials in this procedure.Manufactur- manufacturers and models, the commit- ersMUSTbe consulted for specific de- tee chose to standardize and publish only tails such as material safety data sheets the transfer procedure. The practice may and other manufacturer's recommenda- also be used for substances other than tions. All OSHA standards and rules permethrin if paired with suitable extrac- must also be consulted and followed. tion and analysis techniques. Although 5.1 Good laboratory practices should there is no result or data produced di- be followed. Wear safety glasses and Fig. 1-Martindale abrasion tester. rectly by the procedure,results reported gloves when manipulating treated materi- after final analysis should note the use of als. this procedure. 5.2 All chemicals should be handled with care. 1. Purpose and Scope 5.3 An eyewash/safety shower should be located nearby for emergency use. 1.1 This procedure is used to transfer 5.4 After testing, and to avoid any risk "free" permethrin insecticide from the of contamination bypermethrin,elimi- surface of a textile material to a clean nate all activity of the treated samples, re- (a) cloth for subsequent extraction and anal- ferring to the manufacturer's recommen- (q) ysis. It may also be used to transfer other dation. treatment substances 2. Principle 6.Uses and Limitations 2.1 Using a Martindale abrasion tester, 6.1 The degree of permethrin transfer is affected by the number of rubs.The specimens of atreated samplefabric number shouid be varied toproduce vary- (with permethrin) are rubbed with an un- ing degrees of abrasion and to determine (c) treated white test fabric to transfer the permethrin from the specimen to the the total free permethrin on the surface. white test fabric. Trials at various (in- 6.2 Extraction and analysis are not in- creasing) numbers of rubs are used to de- cluded in this method procedure.Final termine the total amount of free per- resultsmayvarybased ontheselectionof solvent and analytical technique. methrin present on the surface of the test specimen. Fig 2(a) Weight, (b) Sample holder 7. Apparatus, Reagents, and Materials with foam and untreated white 3.Referenced Documents specimen,and (c)Testing table 7.1 Martindale Abrasion Tester (see with felt and test specimen. 3.1ASTM D4850, Standard Terminol- Fig.1)with thefollowingreplaceable ogy Relating to Fabrics and Fabric Test items: Methods (see 11.1). 7.1.1 Standard Felt, of mass 750 ± 50 3.2 ASTM D1776, Standard Practice g/m? and 3 ± 0.3 mm thick, cut into three cut into three 38-mm diameter round for Conditioning and Testing Textiles 40-mm diameter round specimens. specimens. (see 11.1), 7.1.2 Polyurethane Foam Backing, 3 ± 3.3ASTMD4966, Standard Test 0.01 mm thick, 29-31 kg/m3 density, and 8.Specimens Method for AbrasionResistance of Tex- 170-210 N hardness, cut into three 38- tile Fabrics (Martindale Abrasion Tester mm diameterround specimens. 8.1Minimizehandlingofthesampleto Method) (see 11.1). 7.1.3 Weights, to create 12 kPa pres- avoid transfer of permethrin prior to test- sure for woven fabric and 9 kPa pressure ing. 4. Terminology for knitted (see Fig. 2). 8.2Cut three140-mm diameter round 7.2 AATCC Crocking Cloth, 100% specimens diagonally across the width of 4.1 abrasion,n.the wearing away of cotton, plain weave, 32 ± 5 warp ends/ the sample. any