**Down-Proof Performance: Ensuring Feathers Stay Where They Belong**

Down-proof performance refers to the ability of textiles (such as down jackets, sleeping bags, etc.) to prevent the filling material, whether down or feathers, from penetrating through the fabric surface, seams, or needle holes. Down leakage can lead to reduced thermal insulation, affecting both the product's appearance and user experience. Common forms of down leakage include filament fibers escaping from yarn interstices, and down clusters penetrating the fabric or stitching.

Currently, domestic test methods for the down-proof performance of textiles and garments are divided into the **Rubbing Method** and the **Tumbling Box Method**. Key standards include **GB/T 12705.1-2024 "Textiles — Test method for down-proof performance — Part 1: Rubbing method"** and **GB/T 12705.2-2024 "Textiles — Test method for down-proof performance — Part 2: Tumbling box method"**. Additionally, product standards like **"Down garments" (GB/T 14272-2021 Appendix D)** and industry standards like **"Knitted down garments" (FZ/T 73053—2015 Appendix A)** specify methods, both referencing GB/T 12705.2 and employing the Tumbling Box Method for testing down-proof performance.

The scope of the aforementioned standard test methods applies to textile products filled with down and feather (such as down jackets, duvets, etc.) and the fabrics used to manufacture such products (including woven, knitted, and other fabric types). Among these:

*   The **Rubbing Method** is primarily used for evaluating the down-proof performance of the fabric itself or localized structures.

*   The **Tumbling Box Method** is more suitable for testing finished products or overall structures, serving as a comprehensive assessment of the final product.

**Comparison of Test Principles for the Two Methods**

*   **Rubbing Method Principle:** A fabric sample is made into a specimen bag of specific dimensions and filled with a set mass of down and feather filling. Alternatively, a specimen bag of specific dimensions can be cut directly from a down/feather product. The specimen bag is placed inside a plastic bag, installed on the instrument, and subjected to actions such as compression, kneading, and rubbing. The down-proof performance of the fabric or product is evaluated by counting the number of feathers, down clusters, filament fibers, and feather fibers that penetrate from inside the specimen bag.

*   **Tumbling Box Method Principle:** A fabric sample is made into a specimen bag of specific dimensions, filled with a set mass of down and feather filling, or a down/feather product itself serves directly as the specimen. The specimen bag or product is placed inside the rotating box of a down-proof tester, which contains rubber balls. Through the constant speed rotation of the box, the rubber balls are carried to a certain height and impact the specimen inside the box. This simulates the various compressive, kneading, and impact forces that down/feather products experience during use. The down-proof performance is evaluated by counting the number of feathers, down clusters, filament fibers, and feather fibers that penetrate from the specimen bag or product.

**Comparison of Equipment and Materials for the Two Test Methods**

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**Comparison of Test Steps and Parameters for the Two Methods**

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**Comparison of Result Calculation and Evaluation for the Two Methods**

In calculating the number of penetrated fibers, **GB/T 12705.1 (Rubbing Method)** requires counting the penetrated fibers separately for the warp and weft directions (longitudinal and transverse) and reporting the results per direction. For **GB/T 12705.2 (Tumbling Box Method)** , the arithmetic mean of the penetrated fiber counts from two specimen bags is taken as the final result. For tests conducted on a whole product, the test result is taken directly as the final result.

The evaluation indicators for down-proof performance are the same for both test methods.

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*   Product standard **GB/T 14272-2021 "Down garments"** specifies down-proof performance indicators as: Superior grade ≤40 fibers/m², First grade ≤70 fibers/m², Qualified grade ≤120 fibers/m².

*   Textile industry standard **FZ/T 73053-2015** specifies down-proof performance indicators as: Superior grade ≤15 fibers, First grade ≤30 fibers, Qualified grade ≤50 fibers.

**Consumer Tips for Choosing Down Products:**

When purchasing down products for daily use, it is recommended to choose items with high-density fabrics or down-proof coatings. During wear and use, avoid contact with sharp objects to minimize friction and compression. For washing and maintenance, opt for gentle hand washing or professional cleaning, avoiding dry cleaning. When storing, keep the product dry and avoid heavy compression. Following these practices can effectively reduce down leakage in down products.

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*Reposted from the [CTTC China Textile Standard] WeChat platform. Thanks to the original author!*

防钻绒性是指纺织品（如羽绒服、睡袋等）防止填充的羽绒或羽毛从织物表面、接缝处或针孔中钻出的性能。钻绒现象可能导致产品保暖性下降，影响产品外观和使用体验。常见钻绒形式包括绒丝从纱线缝隙中钻出、绒朵穿透面料或缝线等。

目前国内纺织品服装防钻绒性试验方法分为摩擦法和转箱法，标准主要有GB/T 12705.1-2024《纺织品 防钻绒性试验方法 第1部分：摩擦法》）和GB/T 12705.2-2024《纺织品 防钻绒性试验方法 第2部分：转箱法》，另外还有产品标准中的方法如《羽绒服装》（GB/T 14272-2021 附录D )和行业标准中的方法如《针织羽绒服装》（FZ/T 73053—2015 附录A），都是参考GB/T 12705.2采用转箱法进行防钻绒性测试。

上述标准检测方法的适用范围都是以羽绒羽毛为填充物的纺织制品（如羽绒服、羽绒被等）以及制作该类产品的织物（包括机织物、针织物及其他类型的织物），其中：摩擦法主要针对面料或局部结构的防钻绒性能的评估；转箱法更适用于成品或整体结构的测试，是对成品的综合检测。