工业护套晒半年就发脆开裂，线露在外头。工业护套耐温和透光没选对，护线就是裸线。
晒半年就发脆，线露在外头
工业护套是“护线防尘的件”：耐温、透光、柔韧。材料要耐温、透光、柔韧——结论先给：工业护套用 SEBS 基 TPE 是主流；高温护套，TPV 优先。
工业护套最大的坑：透光率差10%，档次差一截。透光率差10%，外观差一截——透光，是护套的档次线。
工业护套是功能件：开裂、发黄都是问题。材料选对，线缆才稳——功能件，别省料钱。
工业护套为什么用 TPE
工业护套用 TPE 的理由：耐温可做、透光可做、柔韧可做、效率高——四条合起来，适合护套。
耐温是核心：环境温度。耐温测试写进验收——变形，就是问题。
透光不能省：外观档次。透光测试写进验收——档次低，就是问题。
护线温度外观，三道关
护线工况：保护线缆。柔韧数据要验——开裂，就是问题。
温度工况：环境温度。耐温数据要验——变形，就是问题。
外观工况：透光档次。透光数据要验——档次低，就是问题。
SEBS 基还是 TPV？护套一表
| 维度 | SEBS 基 | TPV |
|---|
| 耐温 | 可做 | 好 |
| 透光 | 好 | 中 |
| 柔韧 | 好 | 好 |
| 成本 | 中 | 中高 |
| 耐介质 | 中 | 好 |
| 用途 | 常规 | 高温 |
表格读法：TPV 耐温耐介质好但贵；SEBS 基透光好——常规护套 SEBS 基，高温 TPV。
按温度选：高温 TPV，常规 SEBS 基。
护套验收：透光差一截档次差
| 透光率 | 外观 | 判断 |
|---|
| 90% | 透亮 | 合格 |
| 85% | 中 | 关注 |
| 80% | 雾 | 警惕 |
| 75% | 浊 | 换料 |
表格读法：透光一档档测，档次看得见——透光不均、发黄，护套外观档次直接掉。
透光，是护套的档次线。
只看价，三个坑透光漏
坑一：只看价。透光差一截，透明护套雾蒙蒙——透光必测。
坑二：耐温漏测。变形——耐温测试，必测。
坑三：柔韧虚标。开裂——柔韧按实测验收。
选工业护套先核透光
三问：耐温多少度、透光率多少、柔韧按什么标准。一验：实际工况实测——三问一验，供应商底细清楚。
透光验证要先行：把透光率和雾度一起测。先测透光，再谈价格——透光，是护套的档次线。
留样要成习惯：每批留样，耐温透光按批次复测。批次换料先对比再放量——批次稳，客诉少。
工业护套：出问题别乱拆，先看这张表
| 现象 | 原因 | 对策 |
|---|
| 开裂 | 柔韧不足 | 换高柔韧料 |
| 变形 | 耐温不足 | 换耐温料 |
| 档次低 | 透光差 | 换高透光料 |
| 发黄 | 耐黄变弱 | 换耐黄变料 |
| 批次漂移 | 配方波动 | 锁窗口 |
护套主流 SEBS基 TPE，Shore A 70-85，透光率差10%档次差一截。 透明护套看基材纯度，透光数据按批次测——外观档次靠纯料。
SEBS柔韧透光室内用，TPV耐温扛高温护线。 室温护套SEBS，高温走线TPV——按线温选体系。
护套发黄耐候差，先查UV助剂体系，别怪基材。 透光发黄是耐候剂没配够，先核助剂再换料。
护套验收：壁厚均匀、线径配合、耐油浸泡三件套。 内径按线径核，出口环保按批次核报告。
跟产调参把溶胀消除、一次过1000h老化，护套批量不再变形。 每批留样测透光加耐油，批次换料先对比再放量。
护套按线温选，室温 SEBS、高温走线 TPV。 SEBS 柔韧透光室内用，TPV 耐温扛高温护线，护套发黄先查 UV 助剂体系别怪基材，透光发黄是耐候剂没配够。
壁厚均匀和线径配合三件套一起验。 内径按线径核，出口环保按批次核报告，耐油浸泡做溶胀试，每批留样测透光加耐油。
内径按线径核，出口环保按批次核报告。 每批留样测透光加耐油，护套发黄先查UV助剂体系，透光发黄是耐候剂没配够。
护套发黄先查UV助剂，别怪基材。 室温SEBS高温走线TPV按线温选，壁厚均匀线径配合三件套，内径按线径核，每批留样透光加耐油。
护套每批留样测透光加耐油，出口环保按批次核报告。 发黄不是基材问题是耐候剂没配够，内径按线径核，溶胀测试做过再谈换料。
科隆客户案例：耐油不足溶胀变形，跟产过1000h老化
宁波一家工业设备厂，工业护套耐油性不足，泡油后溶胀变形。科隆配合现场跟产调试到良率稳定，溶胀消除，一次性通过 1000h 老化测试。跟产调试，把溶胀锁死在量产前——耐油问题，先看配方再看参数。
小结
工业护套的选型，透光先测，耐温再验，透光率差10%档次差一截，透光是档次线。
Industrial sheaths become brittle and crack after being exposed to the sun for half a year, leaving the wires exposed. The industrial sheaths' temperature resistance and light transmission were not chosen correctly, so the wire protection is just bare wire.
After being exposed to the sun for half a year, it becomes brittle, with the wires exposed outside.
Industrial sheaths are 'components for protecting wires and preventing dust': temperature-resistant, light-transmitting, flexible. The materials should be temperature-resistant, light-transmitting, and flexible — conclusion first: SEBS-based TPE is mainstream for industrial sheaths; for high-temperature sheaths, TPV is preferred.
The biggest pitfall of industrial sheathing: a 10% difference in light transmittance results in a significant difference in grade. A 10% difference in light transmittance leads to a noticeable difference in appearance—light transmittance is the grade line for sheathing.
Industrial sheaths are functional parts: cracking and yellowing are problems. Only with the right material will the cable be stable—functional parts are not the place to save on material costs.
Why use TPE for industrial coatings
Reasons for using TPE for industrial sheathing: can withstand high temperatures, can be made transparent, can be made flexible, high efficiency—together, these four make it suitable for sheathing.
Temperature resistance is key: ambient temperature. Temperature resistance testing should be included in the acceptance criteria—deformation equals a problem.
Translucency cannot be compromised: appearance grade. Include the translucency test in the inspection—if the grade is low, it’s a problem.
Appearance of wire protection temperature, three checkpoints
Cable protection operation: protect the cables. Flexibility data must be tested—cracking indicates a problem.
Temperature working condition: ambient temperature. Temperature resistance data must be tested — deformation is the problem.
Appearance condition: Light transmittance grade. The light transmittance data must be checked—if the grade is low, it is a problem.
SEBS base or TPV? Sheath at a glance
| Dimension | SEBS base | TPV |
|---|
| Temperature resistant | Can do | Good |
| Translucent | Good | middle |
| Flexible | Good | Good |
| Cost | middle | Medium-high |
| Resistant to medium | middle | Good |
| Purpose | Regular | High temperature |
Table reading: TPV has good temperature and media resistance but is expensive; SEBS has good light transmission — conventional jackets are SEBS-based, high temperature ones are TPV.
Select by temperature: high-temperature TPV, conventional SEBS base.
Sheath inspection: poor light transmission indicates lower quality
| Light transmittance | Appearance | Judgment |
|---|
| 90% | transparent and bright | Qualified |
| 85% | middle | Follow |
| 80% | Fog | Be alert |
| 75% | turbid | Material change |
Table reading method: Measure the transparency level step by step, the grade is visible—uneven transparency and yellowing directly lower the grade of the sheath appearance.
Light transmission is the quality line of the sheath.
Only looking at the price, three holes let the light through
Pitfall 1: Only looking at the price. Light transmittance is significantly worse, the transparent sheath is hazy — light transmittance must be tested.
Pitfall 2: Missed temperature resistance test. Deformation — temperature resistance testing is a must.
Pitfall three: Flexibility overstatement. Cracking — flexibility should be measured and accepted based on actual testing.
Choose industrial sheathing by first checking light transmission
Three questions: what is the temperature resistance, what is the light transmittance, and according to what standard is the flexibility measured. One verification: measure under actual working conditions — three questions and one verification, the supplier's background is clear.
Light transmission verification should come first: measure both the light transmittance and haze. Measure the light transmittance first, then talk about the price—light transmittance is the grade line of the sheath.
Making sample retention a habit: retain samples for each batch, and re-test temperature resistance and light transmission batch by batch. When changing materials between batches, compare first before scaling up — stable batches result in fewer customer complaints.
Industrial Sleeves: Don’t Disassemble When Problems Arise, Check This Table First
| Phenomenon | Reason | Countermeasure |
|---|
| Cracking | Insufficient flexibility | Switch to high-flexibility material |
| Transformation | Insufficient temperature resistance | Change to heat-resistant material |
| Low-end | Poor light transmittance | Switch to high-transparency material |
| Yellowed | Weak yellowing resistance | Replace with yellow-resistant material |
| Batch Drift | Formula fluctuation | Lock window |
The mainstream jacket is SEBS-based TPE, Shore A 70-85, with a 10% difference in light transmittance corresponding to a significant difference in grade. For transparent jackets, the purity of the base material is key, and light transmittance data is measured by batch—the appearance grade depends on the pure material.
SEBS is flexible and translucent for indoor use, TPV is temperature-resistant and withstands high temperatures for cable protection. Room temperature sheath SEBS, high-temperature wiring TPV—choose the system according to the wire temperature.
The sheath turns yellow and has poor weather resistance; first check the UV additive system, don't blame the substrate. Yellowing with light transmission is due to insufficient weathering agents; first check the additives before changing the material.
Sheath acceptance: uniform wall thickness, wire diameter fit, trio of oil immersion tests. Inner diameter checked according to wire gauge, export environmental protection checked according to batch reports.
Work with production to adjust parameters to eliminate swelling and pass the 1000-hour aging test at one go, so that the sheath no longer deforms in bulk. Keep samples from each batch to test transparency and oil resistance, and when changing batch materials, compare first before scaling up.
The sheath is selected according to the wire temperature: SEBS for room temperature wiring, TPV for high-temperature wiring. SEBS is flexible and translucent for indoor use, TPV is heat-resistant and can withstand high temperatures to protect the wire. If the sheath yellows, first check the UV additive system instead of blaming the base material; yellowing of translucent material occurs when insufficient weathering agent is added.
The wall thickness uniformity and wire diameter are inspected together with the three-piece set. The inner diameter is checked according to the wire diameter, the environmental protection at the outlet is checked according to the batch report, an oil immersion swelling test is conducted, and each batch retains samples for light transmission and oil resistance testing.
The inner diameter is inspected according to the wire diameter, and the export environmental report is checked by batch. Samples from each batch are tested for light transmittance and oil resistance. If the sheath yellows, first check the UV additive system; if the light transmittance yellows, it means there was not enough weather-resistant agent added.
If the sheath turns yellow, first check the UV additives; don't blame the base material. For SEBS at room temperature and TPV at high temperature, select according to the line temperature. Ensure uniform wall thickness and match the diameter with the three-piece set. The inner diameter should be checked according to the line diameter, and for each batch, keep samples for light transmission and oil resistance testing.
For each batch of sheaths, samples are retained to test light transmission and oil resistance; exports follow environmental protection batch report verification. Yellowing is not a base material issue but due to insufficient weathering agent; the inner diameter is checked according to the wire diameter, and swelling tests have been conducted before discussing material replacement.
Cologne Customer Case: Insufficient oil resistance causing swelling and deformation, compared with products aged over 1000 hours
An industrial equipment factory in Ningbo had industrial jackets with insufficient oil resistance, which swelled and deformed after soaking in oil. Kolon worked together on-site to debug the production until the yield stabilized and the swelling was eliminated, passing the 1000-hour aging test in one go. During production debugging, the swelling was locked down before mass production — for oil resistance issues, first look at the formulation, then at the parameters.
Summary
For the selection of industrial jackets, check light transmission first, then verify temperature resistance. A 10% difference in light transmission corresponds to a significant difference in grade; light transmission is the grade line.
