# Water Repellency Optimization in Cotton-Lycra Knit Fabrics
> A technical report on water repellency (WR) C0 testing for Cotton-Lycra Single Jersey fabrics using PHOBOTEX WR ACE and AATCC 22 spray test methodology.

Tags: textile-engineering, water-repellency, fabric-testing, cotton-lycra, aatcc-22, chemical-finishing, quality-assurance
## Water Repellency Test Report
* **Customer:** ARCHROMA
* **Recipe Code:** 20./12
* **Sample Date:** December 20, 2025

## Project Objective
Evaluation of the Water Repellency (WR) C0 performance on Single Jersey fabric using a specific chemical formulation.

## Fabric Specifications
* **Type:** Single Jersey (S/J) Knitted Fabric
* **Composition:** 95% Cotton / 5% Lycra
* **Weight:** 180 GSM
* **Color:** Black

## Process Application
Chemical treatment applied via standard coating process for uniform distribution.

## Chemical Recipe Formulation
* **Primary Agent:** PHOBOTEX WR ACE (120 g/L)
* **Auxiliaries:** DAN (10 g/L) and DL 600 (10 g/L)

## Drying Parameters
* **Temperature:** 170°C
* **Duration:** 2 Minutes

## Test Methodology
* **Standard:** AATCC 22 (Spray Test)
* Visual evaluation of water-repellent efficacy by spraying water against a taut specimen surface.

## Test Results and Observation
* **Achieved Rating:** 70
* **Status:** FAIL
* **Observation:** Rating of 70 indicates partial wetting of the fabric surface and underside.

## Summary & Next Steps
* Formulation 20./12 did not meet typical passing standards (90-100).
* Recommended action: Review chemical dosage or adjustment of curing temperature and time.
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