淋雨洗车就渗，充电口锈一片。充电口密封圈选错TPV，省下的工序全变返工。
结论先摆：充电口圈，密封耐候绑一起
充电口密封圈是充电口的“防水墙”：淋雨、洗车、凝露都要扛。
材料要密封好、耐候、包胶牢——结论先给：充电口密封圈用 TPV 是主流；要求长期户外，TPV 加耐候体系优先。
充电口密封圈的最大坑：一次包胶，省三道工序。选对料，包胶一体成型省装配；选错料，省下的工序全变返工——包胶选型，就是钥匙。
充电口密封圈是安全件：漏水进充电口，就是安全隐患。密封实测写进验收——密封，就是底线。
TPV凭啥防水：回弹密封，户外耐老
充电口密封圈用 TPV 的理由：密封好、耐候成熟、包胶可做、批次稳——四条合起来，适合充电口。
密封是核心：水密、气密。密封测试（按标准）写进验收——漏一滴水，就是隐患。
耐候不能省：充电口露天。氙灯老化加臭氧老化——晒裂、发脆，都是问题。
三瓢水浇它：淋雨、洗车、冷热凝露
雨水工况：淋雨、洗车高压水。水密测试（按标准）写进验收——漏一滴，就返工。
温差工况：夏天 70℃+、冬天 -30℃。软硬两头验——低温发硬，密封就漏。
插拔工况：充电枪反复插拔。耐磨、回弹数据要验——磨损失效，密封就漏。
TPV还是EPDM：充电口上见高低
| 维度 | TPV | EPDM |
|---|
| 密封 | 好 | 好 |
| 耐候 | 好 | 极好 |
| 包胶 | 可做 | 需处理 |
| 成型 | 注塑 | 硫化 |
| 成本 | 中 | 中高 |
| 批次 | 稳 | 中 |
表格读法：EPDM 耐候极好但硫化慢、包胶难；TPV 包胶可做、效率高——量产件，TPV 是主流。
极端户外场景，EPDM 留；常规充电口，TPV 够用——按场景选。
两个漏项：密封造假、包胶脱层
坑一：密封虚标。纸面水密，实测漏水——密封按实测验收。
坑二：包胶脱层。包胶件用久脱层——剥离强度测试，写进验收。
坑三：耐候漏测。晒几年开裂——氙灯老化，户外件必测。
验收三实测：泡水、插拔、耐候
三问：密封按什么标准、剥离强度多少、耐候按多少小时。一验：淋雨实测——三问一验，供应商底细清楚。
淋雨验证要实测：水密试验、气密仪。实测最硬——省三道工序的前提，就是密封过关。
留样要成习惯：每批留样，密封耐候按批次复测。批次换料先对比再放量——批次稳，客诉少。
省三道工序：包胶一次成型
充电口密封圈的包胶工序，省三道：一体成型省装配、免硫化省工序、自密封省辅料。三道省下来，就是效率——包胶选型，就是钥匙。
省装配：包胶一体成型，减少单独密封件装配。装配少了，错装就少——一体成型，就是起点。
省工序：TPE 免硫化，省硫化线。免硫化，是效率的加速器——工序少，周期短。
省辅料：自密封结构，省密封胶、密封垫。辅料省了，成本就降——结构设计，就是隐形变量。
| 包胶工序 | 省在哪 | 说明 |
|---|
| 一体成型 | 省装配 | 少错装 |
| 免硫化 | 省工序 | 短周期 |
| 自密封 | 省辅料 | 降成本 |
| 单供应商 | 省管理 | 少扯皮 |
表2读法：包胶四省，省的是效率。选错料，省下的全变返工。
| 材料指标 | 要求 | 说明 |
|---|
| 密封 | 按标准 | 防水墙 |
| 耐候 | 氙灯 1000h | 户外件 |
| 剥离 | 按标准 | 包胶牢 |
| 批次 | 逐批稳定 | 量产保障 |
表3读法：四指标是密封圈的体检表。一次包胶，省三道工序。
压缩量按 15%-25% 设计，压超 30% 密封件回弹不回来。 充电口密封圈长期受压，压变 >30%（70℃×22h）的料别用，装上去一周就“压不动”。
漏水不是密封胶不行，是包胶一体成型的剥离力没测。 TPE 包骨架，剥离力写进验收，高压洗车水柱冲不脱才算数。
TPV 耐候好、包胶可做，EPDM 耐候更好但要硫化。 常规充电口 TPV 够用，极端户外留 EPDM，免硫化省一道工序、短一半周期。
打样按高压洗车模拟：高压水柱比淋雨更狠。 水密试验、气密仪双测，漏一滴水就返工，密封过关才谈得上省三道工序。
密封圈是充电口的防水墙，漏进水就是安全隐患。 氙灯 1000h 加臭氧老化，露天件按此验收，晒裂发脆都要挡在门外。
科隆客户案例：成品异味被退，匹配基材良率98%
滁州一家汽车零部件厂，充电口密封圈成品异味被下游退回，货压在仓库。科隆配合重新匹配包胶基材与加工温度，异味消除，量产良率稳定在 98%。异味是基材和温度的匹配问题——匹配对了，气味自然合格。
小结
汽车充电口密封圈的材料选择，是一次判断力的练习，练多了自然就准，功夫在选型之前。
有些生意我们不做。
不问用途就报价的，不做。
把副牌料说成正牌卖的，不做。
It seeps when washing the car in the rain, and the charging port is covered in rust. The wrong TPV was chosen for the charging port seal, and all the saved processes have to be redone.
Conclusion first: charging port ring, sealed and weather-resistant tied together
The charging port seal is the 'waterproof wall' of the charging port: it has to withstand rain, car washing, and condensation.
Materials should be well-sealed, weather-resistant, and securely coated—here's the conclusion first: using TPV for the charging port seal is mainstream; if long-term outdoor use is required, TPV with a weather-resistant system is preferred.
The biggest pitfall of the charging port sealing ring: one-time overmolding saves three processes. Choose the right material, and the overmold can be integrally formed to save assembly; choose the wrong material, and the processes you saved all turn into rework—material selection for overmolding is the key.
The charging port seal is a safety component: if water leaks into the charging port, it is a safety hazard. The actual seal test is recorded in the inspection—sealing is the bottom line.
Why TPV is waterproof: resilient sealing, outdoor aging resistance
Reasons for using TPV for the charging port seal: good sealing, mature weather resistance, can be overmolded, stable batches — together, these four points make it suitable for the charging port.
Sealing is key: watertight and airtight. Seal tests (according to standards) are written into the acceptance—if even a drop of water leaks, it is a hidden danger.
Weather resistance cannot be compromised: the charging port is exposed to the open air. Xenon lamp aging plus ozone aging — cracking and becoming brittle are all problems.
Water it with three ladles: rain, car wash, hot and cold condensation
Rainwater conditions: rain, high-pressure water from car washing. Watertight test (according to standards) recorded in the acceptance—if even a single drop leaks, it must be reworked.
Temperature difference conditions: 70℃ in summer, -30℃ in winter. Tested both ends of hardness—becomes hard at low temperatures, and sealing leaks.
Plug-in and unplug conditions: The charging gun is repeatedly plugged in and out. Wear resistance and rebound data need to be tested — if wear fails, the seal will leak.
TPV or EPDM: seen in the differences at the charging port
| Dimension | TPV | EPDM |
|---|
| Seal | Good | Good |
| weather-resistant | Good | Excellent |
| Overmolding | Can do | Needs to be handled |
| Molding | injection molding | Vulcanization |
| Cost | middle | Medium-high |
| Batch | Stable | middle |
Table reading: EPDM has excellent weather resistance but vulcanizes slowly and is difficult to overmold; TPV can be overmolded and is efficient— for mass-produced parts, TPV is mainstream.
For extreme outdoor scenarios, EPDM is retained; for regular charging ports, TPV is sufficient — choose according to the scenario.
Two omissions: falsified sealing and adhesive delamination
Pitfall 1: False labeling of sealing. Water-resistant on paper, but leaks in actual measurement — sealing should be inspected and accepted based on actual tests.
Pitfall 2: Coating delamination. Coated parts delaminate after long-term use—perform peel strength testing and include it in the acceptance criteria.
Pitfall 3: Weather resistance under-test. Cracking after a few years of sun exposure — xenon lamp aging, outdoor parts must be tested.
Acceptance of three actual tests: soaking, plugging/unplugging, and weather resistance
Three questions: What standards are used for sealing, what is the peel strength, and how many hours of weather resistance. One test: actual rain test — three questions and one test, the supplier's details are clear.
Rain testing must be measured: water tightness test, air tightness meter. Actual measurement is the hardest — saving three processing steps is premised on passing the sealing test.
Making sample retention a habit: retain samples from each batch, seal them, and conduct periodic retests batch by batch. When changing materials between batches, compare first before increasing the volume—stable batches result in fewer customer complaints.
Save three processing steps: one-time molding with rubber coating
The overmolding process of the charging port sealing ring saves three steps: integrated molding saves assembly, no vulcanization saves processes, and self-sealing saves auxiliary materials. Saving these three steps equals efficiency — choosing the right overmolding is the key.
省 Assembly: Integrated rubber molding reduces the assembly of separate sealing parts. Fewer assemblies mean fewer misassemblies—integrated molding is the starting point.
Process simplification: TPE does not require vulcanization, saving the vulcanization line. No vulcanization is an efficiency accelerator—fewer processes, shorter cycles.
Save auxiliary materials: With a self-sealing structure, it saves sealing glue and gaskets. When auxiliary materials are saved, costs go down—structural design is an invisible variable.
| Rubber Coating Process | Where is the province? | Explanation |
|---|
| Integrated molding | Provincial assembly | Fewer incorrect installations |
| Sulfur-free | Process saving | Short cycle |
| Self-sealing | Provincial Auxiliary Materials | Reduce costs |
| Single supplier | Provincial Management | Stop procrastinating |
Table 2 reading: Coated in four provinces, what is saved is efficiency. Choosing the wrong material, what is saved will all turn into rework.
| Material specifications | Requirement | Explanation |
|---|
| Seal | According to the standard | Waterproof wall |
| Weather-resistant | Xenon lamp 1000h | Outdoor components |
| Peel off | According to the standard | Tightly wrapped with rubber |
| Batch | Stabilize batch by batch | Mass production assurance |
Table 3 Reading: The four indicators are the physical examination chart of the sealing ring. One-time coating, saving three processes.
The compression amount is designed at 15%-25%; if compressed over 30%, the seal will not rebound. For charging port seals that are under long-term pressure, do not use materials with compression change >30% (70℃×22h), as they will become 'uncompressible' within a week after installation.
The leakage is not due to the sealant being inadequate; the peel strength of the integrated over-molding with the adhesive has not been tested. TPE over the framework—peel strength must be included in the acceptance criteria, and it only counts if it can't be peeled off by a high-pressure car wash jet.
TPV has good weather resistance and can be overmolded with rubber, while EPDM has even better weather resistance but requires vulcanization. For a regular charging port, TPV is sufficient; for extreme outdoor use, reserve EPDM, avoiding vulcanization saves a step and halves the cycle time.
Proofing simulates high-pressure car washing: the high-pressure water jet is harsher than rain. Water tightness test and air tightness test are both conducted; if a single drop of water leaks, it must be redone. Only when the sealing passes can we talk about saving three processes.
The sealing ring is the waterproof barrier for the charging port; if water leaks in, it becomes a safety hazard. Xenon lamp 1000h plus ozone aging—outdoor components are inspected according to this, and any cracking or brittleness from sun exposure must be kept out.
Cologne Customer Case: Finished Products Returned Due to Odor, Matching Substrate Yield 98%
A car parts factory in Chuzhou had finished sealing rings for charging ports returned by downstream customers due to odor issues, and the goods were piled up in the warehouse. Kolon assisted in rematching the rubber-coated substrate with the processing temperature, eliminating the odor, and achieving a stable mass production yield of 98%. The odor was a matching problem between the substrate and the temperature—once matched correctly, the smell naturally met the standard.
Summary
The material selection for the car charging port seal is an exercise in judgment; the more you practice, the more accurate you naturally become, and the effort comes before the selection.
There are some businesses we do not engage in.
We do not provide quotes without asking the intended use.
We do not sell secondary brand materials as if they were the main brand.
