T/HOMETEX 31-2022 Car interior sewing thread

Scope

Scope: This document specifies the terms and definitions, requirements, test methods, inspection rules, packaging, marking, transportation, and storage for sewing threads used in automotive interiors. This document applies to sewing threads made from polyester and nylon filament for automotive interiors, including those used for car seats, sunroof roofs, and other interior decoration coverings. It does not apply to sewing threads used in automotive airbags. Main technical content: 4.1 The technical requirements for automotive interior sewing threads are divided into two aspects: intrinsic quality and appearance quality. 4.2 The product quality grades are divided into superior, first-grade, and qualified products. 4.3 The intrinsic quality requirements for automotive interior sewing threads are specified in Table 1. **Item** **Superior Grade** **First-grade Grade** **Qualified Grade** **Single-line Breaking Strength** Meets the requirements of Table 2 **Line Density Deviation Rate (%)** ±13.0 ±18.0 **Length Permissible Deviation Rate (%)** ≥≤1000 m-2.0-2.5 4.0-1.0-1.5 ≥≤1000 m-1.5-2.0-3.0 ≥≤5000 m-1.0-1.5-2.0 **Resistance to Rubbing Color Fastness/Grade** ≥Dry Rubbing 43-43 Wet Rubbing 43-43 **Lightfastness Color Fastness/Grade** ≥A-Grade 4-543-4 **Discoloration after Aging/Grade** ≥2-3 **Number of Knots (including Surface Knots)** 1000 m and below ≤1 ≤2 1000 m to 2000 m ≤1 ≤2 ≤3 2001 m and above Each additional 1000 m allows an additional 1 knot (less than 1000 m is calculated as 1000 m)

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