Tekstil sanayiinde hagzllama, kasar, boyama, baskz ve apre gibi farklz i~lemlerde ~e~itli kimyasal maddeler kullanzhr. Bu kimyasal maddelergenelde asitler, alkaliler, oksidasyon maddeleri, indirgen maddeler, nigastalar ve boyalardzr. Bu gibi kimyasallar yanznda yukandaki iglemlerde verimliligi arttlrmak icin az mirtarlarda bazz d@er kimyasal maddeler kullanzltr ki bunlara yardzmcz maddeler denir. Bm yardzmcz maddelerin ise, yzka-giy, alev almazlzk, su iticilik us. gibi ozel efektleri saglamak amaczyla kullanzmz gerekligoriiliir. Tekstil yardzmczlarz, agagzdaki bir veya birden fazla avantajz sai:lamak amaczyla kullanzltr.  Islemi kzsaltmak suretiyle zaman tasarrufu. -fg@ik tasarrufu. -&lemin maliyetini diigiirme. -Kaliteyigeligtirme ve-0zel efektleri gelietirme. Bu makalede, nigastalaryiizey aktif maddeler, yumqattczlar, katalizatorler, aleulermeyi geciktiriciler, su tutmaz maddeler ue kombine su ue yak tutmaz maddeler ele alznacaktzr. 

The textile industry uses various chemicals for different processes such as sizing, bleaching, dyeing, printing and finishing. These chemicals are usually acids, alkalies, oxidizing agents, reducing agents, starches, dyes etc. Besides such chemicals, certain other chemicals are used in smallproportions to increase the efiiency of the aboveprocesses. These are called auxiliaries. Certain auxiliaries are required to produce specific effects such as wash and wear, flame retardancy, water repellency, etc. Textile auxiliaries are used to get one or more of the following aduantages. -Saving of time by shortening theprocess. -Saving in labour.