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American Association of Textile Chemists and Colorists

AATCC TM42

The Applied Technical Family of Companies (ATS FoC) offers AATCC TM42 testing, also known as the Water Resistance: Impact Penetration Test.

The Applied Technical Family of Companies (ATS FoC) offers AATCC TM42 testing, also known as the Water Resistance: Impact Penetration Test. This method evaluates how effectively a textile fabric resists water penetration when subjected to forceful water impact, similar to rainfall. Our technicians spray a measured volume of water onto a taut fabric specimen backed by a pre-weighed blotter, then reweigh the blotter to determine water penetration. This provides a clear, quantifiable assessment of your fabric’s resistance to impact penetration.

Which Fabrics and Products Need AATCC TM42 Testing?

AATCC TM42 applies to any textile fabric, with or without a water-repellent finish. It is especially relevant for garment fabrics and is most important for manufacturers, brands, and suppliers in the following categories:

  • Rainwear, outerwear, and jackets
  • Performance and outdoor apparel
  • Uniforms and workwear
  • Fabrics treated with durable water-repellent (DWR) finishes
  • Untreated fabrics that you want to benchmark

AATCC TM42 provides supporting data if your product must keep wearers dry in wet conditions or you make water-resistance claims.

About Our Lab’s AATCC TM42 Testing Capabilities

Our lab conducts AATCC TM42 testing on both finished and unfinished textile fabrics, managing the entire process from specimen preparation to final reporting. We mount each specimen, apply water spray under controlled conditions, and weigh the blotter before and after exposure. Each specimen is then classified based on water absorption. We can test:

  • Woven and knit garment fabrics
  • Fabrics with and without water-repellent finishes
  • Multiple samples or lots for side-by-side comparison

Our experienced technicians adhere strictly to the method and provide results suitable for quality control, product development, and customer documentation.

What Does AATCC TM42 Testing Reveal About Fabric Performance?

AATCC TM42 indicates how well a fabric resists water under impact, helping predict its likely resistance to rain penetration. Results reflect three factors:

  • Fiber and yarn repellency: how strongly the materials themselves repel water
  • Fabric construction: how tightly the structure resists water passing through
  • Finish performance: how effectively a water-repellent treatment works

These insights allow you to compare fabric options, verify finish performance, and identify weaknesses before your product reaches customers.

Request a Quote

Whether you are developing a new fabric, verifying a finish, or checking a production lot, our team is ready to help. Call +1 (888) 287-5227 to discuss your project, or submit our web request form to learn more.

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