夏天一软化风量就掉，吹不热也吹不冷。热管理风管耐温选低，投诉全压在座椅上。
结论先摆：热管理风管，耐温耐压绑一起
热管理风管是“空调的血管”：送热风、送冷风。材料要耐温、耐压、耐候——结论先给：热管理风管用耐温 TPE 或 TPO 是主流；高温段，耐高温弹性体留。
热管理风管的最大坑：便宜的报价，贵的售后。低价料耐温不够，软化变形，售后单比报价单贵——总账算清，贵料不贵。
热管理风管是功能件：风管塌了，风量就掉。材料选对，空调才稳——功能件，别省料钱。
TPE凭啥走风：耐温可加，管壁还轻
热管理风管用 TPE 的理由：耐温可做、轻量、耐候、成型快——四条合起来，适合风管。
耐温是核心：热风温度高。耐温按长期温度验——软化，就是死法。
耐压不能省：风压、负压。耐压数据按实际风量验——塌管，风量就掉。
三股风过它：冷热风、风压、冷凝水
温度工况：热风 100℃+。耐温加耐热老化——风管软化，风量就掉。
风压工况：风机风压。耐压、抗塌陷数据要验——负压塌管，就是问题。
冷凝工况：冷热交替凝露。耐水、耐水解数据要验——凝露泡软，风管就烂。
TPE还是橡胶：风管上算重量
| 维度 | TPE | 橡胶 |
|---|
| 耐温 | 可做 | 高 |
| 重量 | 轻 | 重 |
| 耐候 | 好 | 好 |
| 成型 | 注塑/挤出 | 硫化 |
| 成本 | 中 | 中高 |
| 批次 | 稳 | 波动大 |
表格读法：橡胶耐温高但重、硫化慢；TPE 轻量、成型快——量产件，TPE 是主流。
极端高温段橡胶留，常规段 TPE——按位置选。
两个死穴：贪低价、耐温造假
坑一：低价料。低价料耐温不够，售后更贵——总账算清，贵料不贵。
坑二：耐温虚标。峰值能扛，长期软化——耐温按长期温度问。
坑三：牌号乱用。牌号不匹配，性能飘——SEBS 牌号速查，先对齐。
售后四笔账：软化、漏风、凝水、返修
三问：耐温按长期多少度、耐压按多少风量、牌号对不对得上。一验：按实际风量打样——三问一验，供应商底细清楚。
售后账要算清：低价料耐温不够，软化变形，售后单比报价单厚。按整车寿命算总账——总账算清，选料不亏。
留样要成习惯：每批留样，耐温耐压按批次复测。批次换料先对比再放量——批次稳，客诉少。
风量掉之前：耐温实测先行
售后总账四笔：料价、安装、停机、索赔。四笔算清，便宜不便宜见分晓——便宜的报价，贵的售后。
料价只是头一笔：安装工时、停机损失都是钱。只看料价，最容易算错账——总账算清，贵料不贵。
停机是隐藏成本：风管塌了，产线停。停机损失，是总账的大头——停线，就是成本。
索赔是风险项：风管失效，索赔就是事故。索赔风险，算进总账——风险，算进总账。
| 总账项目 | 计算 | 说明 |
|---|
| 料价 | 单价×用量 | 头一笔 |
| 安装 | 工时×数量 | 隐性成本 |
| 停机 | 时长×损失 | 隐藏大头 |
| 索赔 | 概率×损失 | 风险项 |
表2读法：售后总账四笔，按整车寿命算，账算到十年才准。
| 材料指标 | 要求 | 说明 |
|---|
| 耐温 | 长期 100℃+ | 热风段 |
| 耐压 | 按风量 | 不塌管 |
| 耐水解 | 按凝露 | 不软化 |
| 牌号 | 对得上 | 性能稳 |
表3读法：四指标是风管的体检表。风管塌了，风量就掉。
风管长期走热风，软化塌陷风量就掉。 耐温按长期热风温度验，冷热交替十次看开裂，软化就是风管的死法。
风管塌了拆仪表台换，换件工时是总账的大头。 停机损失比料钱贵，耐压按风量算，壁厚按长期蠕变验。
样管装满热水压一晚看变形，冷热交替十次看开裂——热管理件最怕冷热疲劳。 小试不过，量产必返工。
TPEE 耐温耐疲劳但贵，SEBS 基够用但温度有限。 按风管出口温度选体系，高温段上 TPEE，常温段 SEBS 基省成本。
风管是功能件，塌了风量就掉、投诉全在座椅上。 耐温、耐压、疲劳一起验，夏天满载是极限工况。
科隆客户案例：阻燃不过检出口卡关，留样数据过检
惠州一家汽车零部件厂，热管理风管阻燃不过检，出口卡关。科隆配合提供同批次留样与物性数据，阻燃等级过检，顺利出口。留样加数据，是过检的底气——数据齐，认证快，出口才顺。
小结
汽车热管理风管的用料没有绝对好坏，只有和工况合不合，这比价格表更重要。
In summer, once the air volume softens, it drops, neither heating nor cooling effectively. The temperature resistance of the thermal management ducts is selected low, and complaints about full pressure are directed at the seats.
Conclusion first: thermal management ducts, temperature and pressure resistant, tie together
Thermal management ducts are the 'blood vessels' of the air conditioning system: delivering hot air and cold air. The materials need to be heat-resistant, pressure-resistant, and weather-resistant — conclusion first: for thermal management ducts, using heat-resistant TPE or TPO is mainstream; for high-temperature sections, high-temperature resistant elastomers are retained.
The biggest pitfall of thermal management ducts: cheap quotes, expensive after-sales. Low-cost materials can't withstand temperatures, soften and deform, making after-sales costs higher than the quoted price — when you tally it up, expensive materials aren't actually expensive.
Thermal management ducts are functional components: if the duct collapses, airflow drops. Choosing the right material keeps the air conditioning stable — functional components, don’t skimp on materials.
Why TPE is prone to airing: temperature resistance can be increased, and the pipe wall is also light
Reasons for using TPE for thermal management ducts: temperature resistance, lightweight, weather resistance, and quick molding — together, these four make it suitable for ducts.
Temperature resistance is key: hot air temperature is high. Temperature resistance should be tested according to long-term temperature—softening is just death.
Pressure resistance cannot be compromised: positive pressure, negative pressure. Pressure resistance data is verified according to actual air volume—if the pipe collapses, the air volume will drop.
Three types of wind pass over it: hot and cold winds, wind pressure, and condensate
Temperature conditions: Hot air 100°C. Heat resistance and heat aging—duct softens, and the airflow drops.
Wind pressure conditions: fan wind pressure. Pressure resistance and collapse resistance data need to be checked — negative pressure causing pipe collapse is the problem.
Condensation conditions: alternating hot and cold causing condensation. Water resistance and hydrolysis resistance data must be tested—if condensation softens it, the duct will rot.
TPE or rubber: count the weight on the duct
| Dimension | TPE | Rubber |
|---|
| Temperature resistant | Can be done | Tall |
| Weight | Light | Heavy |
| weather-resistant | Good | Good |
| Molding | Injection Molding/Extrusion | Vulcanization |
| Cost | middle | Medium-high |
| Batch | Stable | Highly volatile |
Table interpretation: Rubber has high temperature resistance but is heavy and vulcanizes slowly; TPE is lightweight and molds quickly — for mass-produced parts, TPE is mainstream.
Rubber for extremely high temperature sections, conventional TPE for ordinary sections—choose according to location.
Two deadly pitfalls: greed for low prices and fake temperature resistance
Pitfall 1: Low-cost materials. Low-cost materials can't withstand high temperatures, and after-sales service ends up being more expensive — when you total the accounts, expensive materials aren't actually expensive.
Pitfall 2: Overstated temperature resistance. Can withstand peak values, but softens over time — temperature resistance should be measured based on long-term exposure.
Pitfall 3: Random use of grades. Mismatched grades cause performance fluctuations — quickly check SEBS grades and align them first.
Four after-sales issues: softening, air leakage, condensation, repairs
Three questions: What is the long-term temperature resistance, what is the pressure resistance based on what airflow, and is the grade correct. One verification: make a sample based on the actual airflow—three questions and one verification, the supplier's details are clear.
After-sales accounts must be calculated clearly: low-priced materials do not withstand enough temperature, soften and deform, and the after-sales record is thicker than the quotation. Calculate the total account based on the vehicle's entire service life—calculate the total account clearly, and choosing materials will not result in a loss.
Making sample retention a habit: retain samples for each batch, and re-test temperature and pressure resistance by batch. When changing materials for a batch, compare first before scaling up—the more stable the batch, the fewer the customer complaints.
Before the air volume drops: actual temperature resistance test first
There are four items in the after-sales general ledger: material cost, installation, downtime, and claims. When all four are calculated clearly, whether it's cheap or not will be revealed — a cheap quote, expensive after-sales.
Material cost is just the first item: installation labor and downtime losses also cost money. Focusing only on material cost makes it easiest to miscalculate—once the total cost is accounted for, expensive materials aren’t actually expensive.
Downtime is a hidden cost: when the duct collapses, the production line stops. The loss from downtime is the main item in the general ledger—line stoppage equals cost.
Claims are a risk item: if the duct fails, a claim becomes an accident. Claim risk is counted in the general account — risk, counted in the general account.
| General Ledger Item | Calculate | Explanation |
|---|
| Material price | Unit Price × Quantity | The first stroke |
| Install | Hours × Quantity | Hidden cost |
| Shutdown | Duration × Loss | Hide big head |
| Claim | Probability × Loss | Risk item |
Table 2 Reading: There are four entries in the after-sales general ledger. Calculated based on the vehicle's entire lifespan, the account will only be accurate after ten years.
| Material specifications | Requirement | Explanation |
|---|
| Temperature resistant | Long-term 100℃ | Hot air section |
| Withstand pressure | By air volume | Non-collapsible pipe |
| Hydrolysis-resistant | Press the dew | Do not soften |
| Brand | Matches | Stable performance |
Table 3 Reading: The four indicators are the physical examination chart of the air duct. If the air duct collapses, the air volume will drop.
If the duct carries hot air for a long time, it will soften and collapse, and the airflow will drop. Temperature resistance should be tested according to the long-term hot air temperature, and alternating hot and cold ten times to see if it cracks. Softening is the death of the duct.
The air duct collapsed, so the instrument panel was dismantled for replacement. The labor for replacing parts is the main cost in the general ledger. The downtime loss is more expensive than the material cost. Pressure resistance is calculated based on airflow, and wall thickness is checked according to long-term creep.
Fill the sample with hot water and leave it overnight to see if it deforms; alternate between hot and cold ten times to see if it cracks — thermal management parts fear thermal fatigue the most. If it fails small tests, mass production will definitely require rework.
TPEE is temperature-resistant and fatigue-resistant but expensive, while SEBS is adequate but has limited temperature tolerance. Choose the system according to the air duct outlet temperature: use TPEE for high-temperature sections and SEBS for normal-temperature sections to save costs.
The air duct is a functional component; if it collapses, the airflow drops and all the complaints fall on the seats. Temperature resistance, pressure resistance, and fatigue are tested together, with full load in summer being the extreme condition.
Cologne Customer Case: Failed Flame Retardant Inspection Blocking Export, Sample Data Passed Inspection
A Huizhou auto parts factory had its thermal management air ducts fail the flame retardancy inspection, causing a blockage in exports. Cologne cooperated by providing samples and physical property data from the same batch; the flame retardancy level passed inspection, allowing smooth export. Samples plus data are the confidence for passing inspection—complete data leads to fast certification, and only then can exports go smoothly.
Summary
There is no absolute good or bad in the materials used for automotive thermal management ducts; it only matters whether they are suitable for the operating conditions, which is more important than the price list.
