What Dimensions and Performance Specifications Need to Be Confirmed Before Purchasing Heat Shrink Breakout Boots?
When selecting heat shrink breakout boots, size matching is only the first step. Regarding different power projects, it is also necessary to pay attention to the mechanical properties, electrical properties and stability under different temperature conditions of the product. Therefore, before the buyer makes an inquiry from the supplier, in addition to providing the size of the cable and connection parts, it is also recommended to simultaneously confirm the test items and performance requirements of the product.
Confirm the Size of the Trunk and Branch First.
Heat shrink breakout boots need to be matched based on the actual connection structure. Recommend confirmation when purchasing:
· Outer diameter of trunk cable
· Outside diameter of branch cable
· Number and direction of branches
· Maximum outer diameter of connection area
· Ruler to cover
For connection parts with multiple branches or structural changes, it is best to provide a size diagram or a simple structural schematic diagram at the same time to facilitate the supplier to determine the appropriate product structure.
Don't Just Look at the Shrinkage Ratio, But Also Pay Attention to the Size Change After Shrinkage.
The shrinkage performance of heat shrink breakout boots will directly affect installation matching.
A larger degree of radial shrinkage will allow the product to tolerate a certain amount of size variations, and a smaller degree of axial changes will assist in keeping the length under control after heating.
Thus, it is essential to determine when buying:
If there is no resistance while the product is being inserted into the connection area, and if the product is able to hide and fit exactly after completely shrunk.
Regarding the specific selection of shrinkage ratios, you can combine the other article "How Does the Shrink Ratio of Heat Shrink Molded Boots Affect Product Selection?" Further judgment.
Confirm Mechanical Properties According to Project Requirements.
If the cable connection area may be subject to bending, installation stress, or long-term mechanical action, just confirm that the product size is not sufficient. When purchasing, you can focus on viewing the following product:
· Tensile strength
· Elongation at break
· Hardness
· Low-temperature bending performance
· Thermal shock performance
For example, our heat shrink breakout boots have a tensile strength of ≥14.0 MPa, an elongation at break of ≥500%, and a Shore hardness of ≤ 70A; there is no crack after a low-temperature bending test at-55 ± 2 ℃ for 1 hour, and there is also no crack after a thermal shock test at 250±1℃ for 4 hours. These tests can reflect the adaptability of products to temperature changes and mechanical deformation conditions from different perspectives.
Electrical Insulation Properties Should Also Be Included in the Purchase Confirmation.
The insulation performance of cable joints and branch connection areas is another important inspection criterion. During procurement, it can be confirmed according to project requirements:
· Dielectric strength
· Volume resistivity
· Dielectric constant
Our heat shrink breakout boots have a dielectric strength of ≥20 kV/mm, a volume resistivity of ≥1.0×10 13 Ω·cm, and a dielectric constant of ≤3.5. They can be used as insulation layers on wires and electric joints. It would be advisable in major voltage systems or those with electrical safety requirements not to only get electrical requirements confirmed but to raise them with the supplier at an early stage, say during making inquiries before goods arrive, rather than to discover later that they are not as expected.
Focus on Performance Retention After Thermal Aging.
Your product must run continuously over time, so only considering initial performance will probably not tell the whole story.
Take our heat shrink breakout boots as an example. After being tested at 175±1℃ for 168 hours, its tensile strength and elongation at break retention rates are ≥70%. This test can help buyers understand how the material maintains its mechanical properties after high temperature aging. For equipment with long-term operation and obvious temperature changes, thermal aging performance can be used as a reference for screening products.
Confirm Flame Retardant and Material Requirements Based on Actual Projects.
Different application environments have different material requirements. Some industries, such as public transit, military weapons and commercial ships, are examples of areas where flame-retardant, temperature resistance, and material compliance of various requirements are usually a project requirement together.
The material of CCMT products satisfies military specifications, flame-retardant property is OI≥28.0, continuous working temperature range is from -55℃ to +125℃. The product can be used in electrical connections for public transportation, military equipment, commercial ships and similar applications. Systems that require high levels of dependability may also be in such equipment applications.
What Information Can Be Provided to Suppliers Before Purchasing?
In order to improve the efficiency of selection, it is recommended that you prepare the following information before making an inquiry:
| Confirmation Items | Recommended Information |
| Cable Dimensions | Outer diameter of trunk and branch cables |
| Connection Structure | Number, direction and structure of branches |
| Coverage | Length and maximum outer diameter to be protected |
| Shrinkage Requirements | Size before and after shrinkage and shrinkage ratio |
| Mechanical Requirements | Stretch, elongation, low-temperature bending, etc. |
| Electrical Requirements | Dielectric strength, volume resistivity, etc. |
| Environmental Requirements | Operating temperature, thermal shock, long-term operating conditions |
| Material Requirements | Flame retardant, material specifications and project standards |
The selection of heat shrink breakout boots should not just stop at "what is the diameter of the cable". When a product has a complex structure or requires high reliability, a better approach would be to check the dimensional requirements, shrinkage properties, mechanical characteristics, electrical behavior, thermal degradation resistance, and material compatibility together.
Specifying the cable size, connector type, and overall project needs well before the supplier involvement helps them to match our product line more precisely and consequently minimizes the installation / delivery problems stemming from wrong product selection.
Should your project not allow you to specify the exact requirements upfront, you can first send us the size and connection area structure details so that we could suggest suitable heat shrink breakout boots based on the usage environment.
