T/SPUIA 0004-2023 Automotive chassis sealant for thermoplastic polyurethane elastomer

Scope

Scope: This document specifies the terms and definitions, product classification, requirements, test methods, inspection rules, and marking, packaging, transportation, and storage requirements for thermoplastic polyester elastomer seals used in automotive chassis. This document applies to thermoplastic polyester elastomer seals for automotive chassis (hereinafter referred to as "the product"). Main technical content: 1. Physical properties of raw materials: - Hardness (Shore D): 35~72 - Density/(g/cm3): 1.1~1.33 - Tensile strength/MPa:≥154 - Elongation at break/%:≥400 - Low-temperature resistance: Take 5 specimens that meet the requirements of Type 1 dumbbell-shaped specimens as specified in GB/T 528-2009, place them in a -40℃ low-temperature box for 24 hours, and remove them after 24 hours. All specimens should not show cracking or breaking, and the change rate of tensile strength attenuation after breaking should be ≤20%. - High-temperature resistance: Take 5 specimens that meet the requirements of Type 1 dumbbell-shaped specimens as specified in GB/T 528-2009, place them in a 180℃ oven for 3 hours, and remove them after 3 hours. All specimens should not show cracking or breaking, and the change rate of tensile strength attenuation after breaking should be ≤20%. - Sealing performance: - Grade A: After the sealing performance test method for Grade A products as specified in Article 6.2.3.1.2 of this document, there should be no water leakage after the test. - Grade B: After the sealing performance test method for Grade B products as specified in Article 6.2.3.1.3 of this document, there should be no water leakage after the test. - Grade C: After the assembly of the plug, the joint should be reliable and not fall off. - Installation force/NA: - Grade A: 30~70N - Grade B: 60~120N - Grade C: 30~70N - Ejection force/NA: - Grade A: ≥200N - Grade B: 70~150N - Grade C: 40~80N

Development Information

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