What is polyester-cotton workwear fabric?
Polyester-cotton blends two fibers. First, polyester adds abrasion resistance. It also adds wrinkle resistance. Second, cotton adds softness. It also adds moisture absorption and breathability. Therefore, manufacturers use this blend widely. For example, workwear uses it. Protective clothing uses it too. Corporate uniforms also rely on it. Daily wear uses it as well. These fabrics need durability. They also need practicality. Moreover, they need water repellency. Why? Because workers face rain, oil stains, mud, and other tough conditions.
Why stop using C8?
In the past, many mills used C8 agents. Why did they choose C8? Because C8 offered high cost performance. It also offered high water repellency. And it offered high oil repellency on polyester-cotton. However, regulations have changed. Global rules on PFOA/PFOS have tightened. For instance, the EU POPs Regulation applies. The French PFAS ban applies too. Many U.S. states also have restrictions. Several brands have restrictions as well. As a result, C8 products are now banned or restricted. Consequently, they have left the international market.
C6 is now the mainstream choice
Today, the C6 agent is the mainstream product. Compared to C8, C6 has a better environmental profile. In fact, it represents a cross‑generational upgrade. It meets current compliance standards.
A real request from a workwear mill
A workwear fabric mill had used C8 agents for many years. Then they came to Guangzhou Lianzhuang Technology (Texnology®). They had a clear request. Here is what they asked:
“Find us a C6 agent. It must perform close to our old C8 solution. We do not want to change our process much. Also, we do not want a big cost increase. We need a smooth switch.”
The challenge with polyester-cotton
Polyester-cotton has a strongly hydrophobic surface. Thus, different C6 agents vary a lot in water repellency. So the client asked us to use their current C8 product as a benchmark. Then we tested C6 solutions objectively.
How we designed the experiment
The Texnology® technical team set up parallel comparative tests. We based these tests on the client’s real production conditions. First, we defined the benchmark. The benchmark was the client’s current C8 agent A. Next, we defined the test objects. These were C6 agents at the same price level. However, we used different dosages.
Fabric supplied by client: Polyester-cotton, weight 241 g/m², pick‑up rate 59% (3 bar).
Standards we used:
GB/T 4745‑2012 – This is a spray test for water repellency.
GB/T 19977‑2014 – This is a hydrocarbon resistance test for oil repellency.
We ran gradient dosage tests. Through these tests, we fully evaluated C6 performance on polyester-cotton. Then we compared it directly with the C8 benchmark.
Process: Pad‑dry‑cure (one dip, one nip, pressure 3 kg) → drying & curing (170°C × 90 seconds)
Note: Test results are for reference only. Final results depend on actual production conditions.
What did we find?
After repeated testing, we validated the results on site. Then we chose the following C6 solution for the customer.
✅ Water repellency is close to the original C8 level. Therefore, it is good enough for daily rain protection. It also works for oil protection on workwear.
✅ Process adjustment is minimal. So the mill can switch directly on their existing production line.
✅ The solution is fully compliant with current EU and Chinese regulations. Indeed, it contains no PFOA or PFOS.
✅ It is cost‑effective. Hence, there is no significant cost increase.
The final outcome
Finally, we helped the customer switch smoothly. They now use a compliant C6 system. This ensured good water repellency for their workwear fabrics. It also ensured supply continuity.
Conclusion
The C8 era is ending. Moving from C8 to C6 is not just a product swap. In fact, it is a full challenge. First, it involves formula compatibility. Second, it involves process adaptability. Third, it involves regulatory compliance. Guangzhou Lianzhuang Technology focuses on textile waterproofing solutions. Therefore, we are committed to providing accurate solutions. We also provide actionable replacement solutions. We help more workwear fabric mills make the switch.
