SN/T 4690-2016 in English
VALIDTechnical specifications for identification defects of import renewing used tyre
- Issued on:2016-12-12
- Implemented on:2017-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$369.00
| Standard No: | SN/T 4690-2016 |
| Document status: | VALID |
| Title in English: | Technical specifications for identification defects of import renewing used tyre |
| Title in Chinese: | 进口翻新用旧轮胎缺陷判定技术规范 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2016-12-12 |
| Implemented on: | 2017-07-01 |
| Professional Classification: | SN-Import&Export Inspection |
| Related Keywords: | 6326-2016 passenger car tires
limit tread depth measurement sb/t limit tread depth measurement tyre introduction sb/t retreaded tires process requirements production process control analysis |
| Related Topics: | Regulatory flaws
old and new norms technical flaw fetal defects fetal defects Singapore import chain box import Waste imported equipment Imported fertilizer judgment |
Introduction
Analysis of Core Defect Types
3.4 Diagonal Cracks: Cracks in the tire carcass extending at a 45° angle. A tire with a depth exceeding 1.6mm is considered unqualified. Typical cases show that this defect most often occurs in the shoulder area.
3.5 Circumferential Fatigue Fracture (Zipper-like Fracture): Sudden cracking along the circumference of the tread, requiring compliance with a 150kPa pressure test requirement.
Test Method Specifications
Clause 4.2 stipulates: For tread wear rate testing, the projection measurement method specified in GB/T 7037 shall be preferred. When the remaining tread depth is ≤1.6mm, the wear is considered excessive.
Clause 4.5 requires: Impact fracture testing must be conducted at an ambient temperature of -10℃±2℃, and the drop weight height error must not exceed ±5mm.
Implementation Suggestions
- Establish a defect sample library: collect typical defect samples for comparison and reference
- Strengthen tire body inspection: focus on inspecting the junction between the tread crown and the sidewall
- Improve the recording system: retain video data of the inspection process for at least 3 years
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