Original wet rubbing fastness improving agent is poor deep dyeing for direct, reactive, indigo blue and sulfur dyestuffs, especially for dark black, bright red and turquoise blue whose wet rubbing fastness is below Grade 1, while fabric wet rubbing fastness exported to Europe and US must be above Grade 3. Therefore,choosing the high quality wet rubbing fastness improver agent is the best solution. Our company specially developed environment-friendly wet rubbing fastness improving agent 809 that improve the product stability of salt & alkali and reduce the structure insufficient of the product.