Double-Washing and Sunlight Tests: How HUCAI Simulates Real Wear Conditions
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- Issue Time
- Oct 11,2025
Summary
HUCAI collaborates with certified fabric laboratories for double-washing and sunlight exposure testing, while its in-house QA team performs garment-level rechecks to ensure lasting color, fit, and durability. Learn how HUCAI guarantees performance consistency for premium activewear brands.
From Lab Testing to Real-Life Verification
For premium activewear brands, long-term durability and consistent appearance are non-negotiable. Repeated washing, sunlight, perspiration, and body friction can gradually affect ordinary fabrics, leading to fading, shrinkage, or loss of elasticity.
At HUCAI Garment Co., Ltd., we maintain strict quality assurance through a two-tier verification system —
1️⃣ Laboratory testing by certified fabric suppliers, and
2️⃣ In-house garment rechecking after production.
This combination ensures that each HUCAI product maintains its shape, color, and comfort even after months of wear and wash.
1. Why Simulated Wear Testing Matters
Sportswear endures more extreme conditions than everyday apparel — frequent washing, sweat, UV light, and heat. That's why HUCAI works closely with partner fabric mills to perform realistic wear simulations before mass production.
These tests help:
- Predict fabric performance after repeated washing and sunlight exposure.
- Verify dimensional stability and elasticity retention.
- Prevent fading, shrinking, and pilling during extended use.
2. Double-Washing Test: Laboratory Testing + In-House Recheck
The Double-Washing Test is conducted in two stages — first at the fabric laboratory, then verified again at HUCAI's factory.
Stage 1: Fabric Laboratory Testing
Partner mills conduct standardized tests following AATCC and ISO protocols to evaluate:
- Colorfastness to washing (Grade 4–5)
- Shrinkage control (≤3%)
- Elastic fiber recovery and seam strength
- Fabric surface and appearance retention
All test reports are reviewed by HUCAI's fabric development team before fabrics are approved for cutting.
Stage 2: HUCAI In-House Garment Recheck
Once garments are produced, HUCAI's QA team performs simplified but essential retests to confirm real production performance:
- Controlled washing using standard detergent and temperature.
- Comparison of pre- and post-wash measurements.
- Inspection of stitch stability, logo adhesion, and print durability.
- Evaluation of color consistency between panels to prevent dye transfer.
This ensures that final garments maintain their lab-verified performance even after actual production processes.
3. Sunlight Exposure Test: Conducted at Fabric Laboratories
The Sunlight Exposure Test is performed by HUCAI's certified fabric suppliers using UV simulation equipment to replicate outdoor conditions. Samples are exposed to high-intensity UV light for 24–48 hours to assess:
- Light fastness and yellowing
- Fiber strength and elasticity after exposure
- Softness and color stability
Only fabrics that meet Grade 4 light fastness or higher proceed to mass production, ensuring HUCAI's garments remain bright and stable in outdoor and high-heat environments.
4. Laboratory + Garment Recheck: A Dual Assurance System
HUCAI has established a “Lab + Factory Verification” quality assurance loop that links material sourcing, production, and final inspection.
Fabric Lab Testing — Performed by Partner Fabric Mills
Key Tests: Colorfastness, Lightfastness, Shrinkage, Stretch Recovery
Purpose: Guarantee fabric quality before production
Garment Rechecking — Performed by HUCAI In-House QA Team
Key Tests: Wash test, stitch inspection, logo adhesion, panel color comparison
Purpose: Verify garment stability after production
In addition, HUCAI also conducts:
- Human Wear Trials: Real models perform workouts to evaluate comfort, ventilation, and surface durability.
- Abrasion Simulation Tests: Rotating drum tests mimic long-term friction and pilling resistance.
- Combined Light & Wash Simulation: Fabrics are exposed to UV light and then washed repeatedly to replicate real-life degradation.
This comprehensive testing process gives HUCAI's brand partners accurate, realistic data about long-term product performance.
5. HUCAI's Approach to Reliable Quality
By combining external laboratory testing and internal verification, HUCAI ensures that every garment:
- Retains its color and elasticity.
- Maintains shape and structure.
- Keeps logos, seams, and trims intact after washing.
- Delivers a consistent, premium appearance to end users.
All test results and verification data are digitally recorded in HUCAI's MES production system, providing full traceability from fabric sourcing to final shipment.
Tested at the Source, Verified by HUCAI
At HUCAI, quality testing is not limited to the factory floor — it begins at the source and ends with the finished product. Through fabric laboratory testing and in-house garment rechecks, we ensure every sportswear piece withstands time, movement, and repeated washing while maintaining its premium appearance.
Looking for a sportswear manufacturer that combines professional lab testing with in-house quality verification?HUCAI integrates digital production systems and advanced quality control to deliver consistent results — every time.
👉 Contact us today to start your next collection.
Who conducts double-washing and sunlight tests?
Laboratory tests are carried out by HUCAI's partner fabric mills. HUCAI's in-house QA team performs additional garment-level rechecks to confirm stability after production.
Why separate lab and in-house testing?
Lab tests validate material performance, while in-house rechecks confirm that the manufacturing process does not alter fabric integrity or appearance.
What does HUCAI test at the garment stage?
Washing appearance, measurement changes, stitching strength, logo adhesion, and color consistency between panels.
