Nikwax treatments coat fabric and leather fibres with a network of elastic TX.10i water-repellent molecules. They bond to anything that is not water-repellent, but leave the spaces between fibres open and breathable. Nikwax treatments can flex and move with the fabric and leather fibres. That is why Nikwax treatments can withstand several washings and remain whereas the competitors must be re-applied after each wash.
The TX.10i elastomer adds tear strength to fabrics as well. Enhanced tear resistance is achieved through lubrication of the fabric which allows the fibres to slide easily over one another. the treatments also coat the fibres with the elastic polymer that is resilient and allows the fibres to flex a limited amount and return to their original position. This reduces the stress at the intersection of the fibres adding tear strength to the fabric.
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