Understanding Standards for Heat Shrink Tubing and Assessing Quality through Effective Measurement Methods
I believe that everyone is already familiar with heat shrinkable tubes, which are sleeves with the function of shrinking when exposed to heat. However, many users are not very clear about the standards for heat shrinkable tubes. Today, the editor of DUWAI will talk about the standards of heat shrinkable tubes and how to judge the heat shrinkable tubes. We will give you a detailed analysis of the quality of shrink tubes.
Heat shrinkable tubes have certain technical indicators, and research and development must go through continuous testing. After reaching the performance indicators, they can be officially mass-produced. However, there are also some small non-compliant workshops that produce some unqualified heat-shrinkable tubes that can be produced in a short time. It meets the technical standards, but cannot meet the requirements for a long time, so it becomes crucial for users to judge the quality of heat shrinkable tubes themselves.
What are the standards for heat shrink tubing and their testing methods?
1. Heat shrinkable tube implementation standard: UL224.
2. Halogen-free, low smoke, non-toxic, soft and flame retardant.
3. Starting shrinkage temperature: ≥84℃, final shrinkage temperature: ≥120℃.
4. Long-term use temperature: -45℃～125℃.
5. Environmental protection standards: RoHS.
| Heat shrink tubing standards | ||||
| Performance | Test Methods | Test Data | ||
| Physical properties | Tensile Strength/MPa | GB/T1040 | ≥10.4 | |
| Elongation at break/% | GB/T1040 | ≥200 | ||
| Tensile strength after heat aging/MPa | UL224；158℃×168h | ≥7.3 | ||
| Elongation at break after thermal aging/% | UL224；158℃×168h | ≥100 | ||
| Thermal shock resistance | UL224；250℃×4h | Not sticky or cracked | ||
| Resistance to cold bending | UL224；-30℃×1h | No cracking | ||
| Electrical properties | Pressure resistant | 300V | UL224 | 1500V No breakdown |
| 600V | UL224 | 2500V No breakdown | ||
| Breakdown strength/KV/mm | GB/T1408 | ≥15 | ||
| Volume resistivity/Ω•cm | GB/T1410 | ≥1×1014 | ||
| Chemical properties | Copper stability | UL224；158℃×168h | PASS | |
| Corrosion resistance | UL224；158℃×168h | PASS | ||
| Flame retardancy | UL224，vw-1 | ☆ | ||
How to judge the quality of heat shrink tubing?
After clarifying the standard technical indicators of heat shrink tubes above and testing them one by one according to the standards of heat shrink tubes, you can easily judge the quality. The following introduces several simple judgment methods to facilitate testing projects.
1. Flame retardancy: As long as it is burned with fire, it can be tested. After igniting and leaving the fire source, if it can self-extinguish in 30 seconds, it can be judged that the flame retardancy is qualified.
2. Thermal shock: If left for 4 hours at a high temperature of 250°C, if there are no cracks or melting or dripping, the thermal shock is qualified.
3. Tensile strength: It can be tested with a tensile tester. If it breaks under a force of 10Mpa, it is a high-quality heat shrinkable tube.
There are many items in the heat shrink tube standards that require professional testing instruments to detect. Therefore, when users purchase heat shrink tubes, they can ask the manufacturer to test them on their behalf and issue a corresponding test report. This is one of the convenient and fast ways. The heat shrink tubing produced by DUWAI Company can fully comply with the heat shrink tubing standards. Welcome to inquire.
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