车厂审厂报告递上去，阻燃和气味两项被打回。汽车TPE，四道门槛一道都不能省。
翻车现场：汽车 TPE，钱是怎么亏的
汽车 TPE 的用量在车里排得上号——密封条、防尘罩、线束护套、减震件、挡泥板，一台车几十处。但它的翻车现场也很典型：
现场一：密封条装车一年，发硬开裂，客户索赔——耐候没扛住，紫外线把材料“晒熟了”；现场二：线束护套过不了阻燃，
出口卡关——阻燃等级和认证没对齐，整柜货压在港口；现场三：车内件气味超标，主机厂直接退货——**VOC 不过关，
材料再便宜也进不了内饰清单。
**
汽车 TPE 的坑，集中在四个字：门槛多。
报价单上的差价，往往就是报废单上的差价。
同一条密封条，A 供应商便宜 2000 元/吨，B 供应商贵一点但给你一份完整的耐候老化报告——量产三年后再看，A 的件已经发硬开裂，
B 的件还在主机厂清单里稳定供货。
汽车 TPE 的成本账，从来不是一吨差多少钱，而是一万件里废多少件——耐候、耐温、耐油、认证，一道不过，前面省的钱都会从报废单里还回去。
先把汽车 TPE 的岗位盘一遍，再谈选型——不同部位，门槛完全不同：
| 部位 | 典型件 | 首要门槛 | 推荐体系 |
|---|
| 车外饰 | 密封条、挡泥板、防尘罩 | 耐候（UV、雨水） | TPV、耐候 SEBS 基 |
| 发动机舱 | 线束护套、减震件、管件 | 耐温、耐油 | TPEE、阻燃 TPE |
| 车内饰 | 仪表板包覆、扶手 | VOC、气味 | 低 VOC SEBS 基 |
| 底盘 | 波纹管、减震垫 | 耐油、疲劳 | TPV、TPEE |
技术金句：汽车 TPE 的选型，是四道门槛的排序题——耐候、耐温、耐油、认证，排错顺序就翻车。
耐候这件事，很多人以为“加了 UV 吸收剂就耐晒”。
实际是两层：UV 吸收剂负责把紫外线挡在表面，光稳定剂负责把漏进去的自由基中和掉，
抗氧剂负责扛住高温氧化——三样配合才叫耐候体系。
只看 TDS 上“耐 UV”三个字的，基本是外行。要数据，就要氙灯老化 500h、1000h 的色差和强度保留率。
原因拆解：四道门槛，为什么一道都不能省
门槛一 · 耐候：汽车件常年户外，紫外、雨水、温差一起上。不抗 UV 的 TPE，一年就变色发脆——密封条变硬、防尘罩开裂，都是耐候欠账。
门槛二 · 耐温：发动机舱里 125℃ 是常态，夏天暴晒的顶棚件也能到 90℃+。常温件和高温件，体系完全两套——普通 SEBS 基扛不住发动机舱，要上 TPV 或 TPEE。
门槛三 · 耐油：线束护套、密封件难免接触油液。不耐油的 TPE 泡油就溶胀，尺寸一飘，密封就失效。
门槛四 · 认证：主机厂清单制，材料不在认证清单里，再好也进不了门。VOC、气味、阻燃（如 UL94）、耐候（如 PV3929 之类），各厂各有门槛。
这四关，是“先有资格、再谈性能”的顺序——认证不过，性能白谈。
主机厂的认证清单还有个“动态更新”的特点：新车型、新项目，往往会有新增的材料要求——今年过检的牌号，
明年新项目可能不在清单里。
所以汽车 TPE 的供应商选择，要选“能跟着主机厂要求走”的：主机厂要求更新，供应商能快速补检、补数据、补方案。
选一个反应快的供应商，比选一个便宜 2000 元/吨的供应商，更省心。
四道门槛的典型翻车，一张表看清：
| 门槛 | 翻车表现 | 常出的体系问题 |
|---|
| 耐候 | 一年变色发脆、密封条硬化 | 用了不耐 UV 的普通 SEBS 基 |
| 耐温 | 发动机舱件变形、老化快 | 用常温体系顶高温岗位 |
| 耐油 | 泡油溶胀、尺寸漂移、密封失效 | 耐油等级没对标油液种类 |
| 认证 | 主机厂清单外、卡审厂 | 材料证书、VOC 报告没备齐 |
排查步骤：三步锁车用 TPE
汽车件下厂之前，还差一道“数据对账”：把 TDS 上的强度保留率、压缩永久变形、耐油溶胀率，跟实际装车环境逐项对一遍。
对不上的项，就是量产后的风险项——宁可换料，也别带着疑问开模。
1. 先定位部位：车外饰（密封条、挡泥板）→ 耐候优先；发动机舱 → 耐温优先；车内 → VOC 优先；线束 → 阻燃优先；
2. 再对认证：主机厂材料清单（如大众 TL、通用 GMW 系列标准）里有哪些牌号？先筛在清单内的，再谈别的；
- 3. 三算寿命：件要求几年？10 年车龄的密封条，耐老化数据必须到位。
三步走完，候选材料从“一堆”缩到“一页”
和主机厂打交道有个窍门：先问采购要“材料清单”，再问技术要“件测试要求”，两条线分开问。
材料清单管“能不能进”，件测试管“能不能用”——很多厂只对了一半，结果进得了清单、过不了件测试，或者相反。
两条线都对齐，选型才算闭环。——汽车 TPE 选型，先守规则，再选性能。
| 步骤 | 动作 | 输出 |
|---|
| 一 | 定位部位，定首要门槛 | 一页“部位→门槛”清单 |
| 二 | 对主机厂材料清单筛牌号 | 清单内候选 3-5 个 |
| 三 | 按寿命要求对耐老化数据 | 终选 1-2 个体系 |
过审翻车怎么救：料、体系、认证三处补
料的方向：同体系内调牌号——耐候不够加 UV 稳定剂、气味超标换低 VOC 配方、阻燃不够上阻燃体系。先问“哪个参数不达标”，再决定换不换料。
体系的方向：汽车 TPE 的体系选择很清晰——密封条看 TPV（耐候耐温）、护套看阻燃 TPE（UL94 V0）、减震看 TPEE（耐温疲劳）、内饰包覆看 SEBS 基（低 VOC 手感）。体系选对，一半问题消失。
认证的方向
材料认证和件认证是两件事，但常被混成一件事。
材料证书证明“这个牌号符合标准”，件测试证明“这个件用这个料没问题”——主机厂两个都要。
供应商只能帮你到材料证书这一层，件测试要靠你自己和模具、工艺一起跑。
两层分不清，跟主机厂沟通就打太极——主机厂要的是“材料在清单内 + 件测试通过”，缺一条都卡关。
科隆客户案例：阻燃不过检，配方一调顺利出口
上海一家汽车零部件厂，线束护套阻燃不过检，出口订单卡关。科隆介入后重调配方——油、助剂、填充比例三样微调，阻燃等级过检，货顺利出口。
阻燃不过检，常常不是阻燃剂不够，是配方平衡没调好——油分多了阻燃掉，助剂体系不对阻燃也掉。调配方比换体系快，也比换体系省钱。
汽车料到货查这四项，气味阻燃必看
- 1. 查认证文件：材料证书、检测报告，原件或盖章件；
- 2. 查 VOC 数据：车内件要气味等级和 VOC 报告（如 VDA 270 气味等级）；
- 3. 查耐候数据：户外件要紫外老化数据（如 500h/1000h 后色差、强度保留率）；
- 4. 批次留样：每批留 500g，出争议时同环境对比。
四条里，认证文件和 VOC 数据最容易被“口头承诺”跳过
VOC 还有个批次风险：同一牌号，这个批次合格，下个批次助剂换了个产地，数据可能就飘了。
所以主机厂审核时爱看“连续三个批次的 VOC 报告”——不是一张，是三张。
跟供应商谈的时候，直接要近半年的批次检测记录，比听一百句“我们符合标准”都管用。
——而这两项，恰恰是主机厂审核的硬门槛。
| 检查项 | 看什么 | 验收要点 |
|---|
| 认证文件 | 材料证书、检测报告 | 原件或盖章件，编号可查 |
| VOC 数据 | 气味等级、VOC 报告 | 与主机厂要求等级对得上 |
| 耐候数据 | 紫外老化后色差、强度 | 500h/1000h 数据留档 |
| 批次留样 | 每批 500g 留样 | 出争议时同环境对比 |
小结
汽车 TPE 的四个门槛——耐候、耐温、耐油、认证，过一关少一个坑，收藏起来备查。
汽车 TPE 不是“一种料”，是“一堆岗位上的料”：密封条找 TPV、护套找阻燃料、减震找 TPEE、内饰找低 VOC。岗位对上了，再谈价格；岗位不对，再便宜也是负担。
最后算一笔账：一台车几十处 TPE，每处省 2000 元/吨，一年省不了多少；但一处选错，报废、索赔、停线，一次就把全年的省全赔回去。汽车件的特点就是这样——材料的单价占比小，出错的代价占比大。所以汽车 TPE 的采购，比的不是谁便宜，是谁的岗位对得准、数据给得全。
The car factory inspection report was submitted, but the flame retardancy and odor items were rejected. For automotive TPE, none of the four door sills can be omitted.
Crash scene: Car TPE, how the money was lost
The usage of TPE in cars ranks prominently inside the vehicle—seals, dust covers, wiring harness sheaths, shock absorbers, mudguards, dozens of places in a single car. But its failures are also quite typical:
Scene 1: The sealing strip was mounted on the vehicle for a year, became hard and cracked, and the customer filed a claim—the weather resistance didn't hold up, the UV rays 'cooked' the material; Scene 2: The wiring harness sheath didn't pass the flame retardant test.
Export stuck at customs — flame retardant rating and certification do not match, the whole container is held at the port; On-site Issue Three: excessive odor in vehicle interior parts, the OEM directly returned the goods — **VOC did not pass,
No matter how cheap the material is, it can't be included in the interior list.
**
The pitfalls of automotive TPE can be summed up in four words: many thresholds.
The price difference on the quotation is often the same as the price difference on the scrap list.
For the same sealing strip, supplier A is 2,000 yuan per ton cheaper, while supplier B is a bit more expensive but provides a complete weathering aging report—after three years of mass production, the parts from A have already hardened and cracked.
The B parts are still on the OEM's list and supplied steadily.
The cost accounting of automotive TPE has never been about how much a ton costs, but about how many pieces are scrapped out of ten thousand — weather resistance, temperature resistance, oil resistance, certification, if it fails at any stage, the money saved earlier will be paid back through the scrap slips.
First go over the positions of automotive TPE, then talk about selection—different parts have completely different thresholds:
| Body part | typical part | Primary threshold | Recommendation system |
|---|
| Exterior trim | Sealing strip, mudguard, dust cover | Weather resistance (UV, rain) | TPV, weather-resistant SEBS-based |
| Engine compartment | Wire harness sleeves, shock-absorbing components, pipe fittings | Temperature-resistant, oil-resistant | TPEE, flame-retardant TPE |
| Car interior | Dashboard covering, armrest | VOC, odor | Low VOC SEBS base |
| chassis | Bellows, shock pads | Oil-resistant, fatigue | TPV, TPEE |
Tech Catchphrase: Choosing TPE for cars is like a four-step threshold ranking question — weather resistance, temperature resistance, oil resistance, certification. Getting the order wrong leads to failure.
Regarding weather resistance, many people think 'adding a UV absorber makes it sun-resistant'.
In fact, there are two layers: the UV absorbers are responsible for blocking ultraviolet rays on the surface, and the light stabilizers are responsible for neutralizing the free radicals that get through.
Antioxidants are responsible for withstanding high-temperature oxidation — only the combination of all three can be called a weather-resistant system.
Those who only look at the three words 'UV resistant' on the TDS are basically laypeople. If you want data, you need the color difference and retention rate of strength after 500h and 1000h of xenon lamp aging.
Cause Analysis: Four Thresholds, Why None Can Be Skipped
Threshold One · Weather Resistance: Car parts are outdoors all year round, exposed to UV, rain, and temperature variations simultaneously. TPE that isn’t UV-resistant will discolor and become brittle within a year—sealing strips harden, dust covers crack; these are all consequences of insufficient weather resistance.
Threshold Two · Temperature Resistance: 125℃ is normal in the engine compartment, and roof panels exposed to the summer sun can reach 90℃. Normal temperature parts and high temperature parts are completely two separate systems — ordinary SEBS cannot withstand the engine compartment, you need to use TPV or TPEE.
Threshold Three · Oil Resistance: Wire harness sheaths and seals inevitably come into contact with oil. Oil-resistant TPE prevents swelling caused by oil, which would otherwise cause dimensional changes and lead to seal failure.
Threshold Four · Certification: OEM list system—if the materials are not on the certification list, no matter how good they are, they cannot pass the gate. VOC, odor, flame retardancy (such as UL94), weather resistance (such as PV3929, etc.), each manufacturer has its own thresholds.
These four stages follow the sequence of 'qualifications first, performance later'—without certification, performance is meaningless.
The OEM's certification list also has a 'dynamic update' feature: for new models and new projects, there are often additional material requirements—grades that pass inspection this year,
Next year's new project may not be on the list.
Therefore, when choosing TPE suppliers for automobiles, you should select those 'who can follow the requirements of the OEM': when the OEM requires updates, the supplier can quickly conduct supplementary inspections, provide additional data, and update plans.
Choosing a supplier who responds quickly is more worry-free than choosing one that is 2,000 yuan/ton cheaper.
A typical failure at the four thresholds, clearly seen in one table:
| Threshold | Crash performance | Frequently occurring system issues |
|---|
| weather-resistant | Changes color and becomes brittle in one year, sealing strip hardens | Used ordinary SEBS base that is not UV-resistant |
| Temperature resistant | Engine compartment parts deform and age quickly | Use a room temperature system for high-temperature positions |
| Oil-resistant | Oil swelling, dimensional drift, sealing failure | The oil resistance grade does not match the type of oil. |
| Certification | Outside the OEM list, card review factory | Material certificates and VOC reports are not prepared. |
Troubleshooting Steps: Three-Step Car Lock with TPE
Before automotive parts leave the factory, there is one more step of 'data reconciliation': comparing the strength retention rate, compressive permanent deformation, and oil swelling resistance rate on the TDS with the actual in-vehicle environment item by item.
Items that don't match are the risks after mass production—it's better to change the material than to proceed with molding with doubts.
1. First, determine the location: exterior of the car (weatherstrips, mudguards) → prioritize weather resistance; engine compartment → prioritize heat resistance; interior → prioritize VOC; wiring harness → prioritize flame retardancy;
2. Re-certification: What grades are listed in the OEM material lists (such as Volkswagen TL, GM GMW series standards)? First screen those in the list, then discuss others;
- 3. Calculate lifespan: How many years are required for the part? For a 10-year-old vehicle's sealing strip, the anti-aging data must be in place.
Completed in three steps, candidate materials are reduced from 'a pile' to 'one page'
There’s a trick to dealing with OEMs: first ask the purchasing department for the 'materials list,' then ask the technical department for the 'component test requirements,' keeping the two lines separate.
The materials list checks 'whether it can be included,' and the part test checks 'whether it can be used'—many factories only handle half of this, resulting in being able to get past the list but failing the part test, or vice versa.
Both lines must be aligned for the selection to be considered complete. —— For automotive TPE selection, follow the rules first, then choose based on performance.
| Step | Action | Output |
|---|
| One | Locate the position and set the primary threshold | A one-page 'Body Part → Threshold' list |
| Two | Screening material grades for OEM material lists | 3-5 candidates from the list |
| Three | Aging resistance data according to life requirements | Finally select 1-2 systems |
How to fix a review failure: patch in three areas – materials, system, and certification
Direction of materials: Within the same system, adjust the grade—if weather resistance is insufficient, add UV stabilizer; if the odor exceeds limits, switch to a low VOC formulation; if flame retardancy is insufficient, use a flame-retardant system. First ask 'which parameter does not meet the standard,' and then decide whether to change the material.
System direction: The choice of TPE systems for automobiles is very clear—seals use TPV (weather and temperature resistant), protective covers use flame-retardant TPE (UL94 V0), shock absorption uses TPEE (temperature fatigue resistant), and interior coverings use SEBS-based (low VOC, pleasant feel). Choosing the right system solves half the problem.
Direction of certification
Material certification and part certification are two different things, but they are often confused as the same thing.
The material certificate proves 'this grade meets the standard,' and the part test proves 'this part is fine with this material' — the OEM requires both.
The supplier can only help you up to the material certification stage; part testing depends on you, working together with the mold and process.
Can't distinguish between the two layers, and when communicating with the OEM, they just give vague answers—the OEM wants 'the material is on the list and the part passes the test,' and missing any one of these will block progress.
Cologne Customer Case: Flame Retardant Failed Inspection, Formula Adjusted Successfully for Export
A car parts factory in Shanghai failed the flame-retardant test for wiring harness sheaths, causing export orders to be held up. After Cologne intervened and readjusted the formula—slightly tweaking the proportions of oil, additives, and fillers—the flame-retardant level passed the test, and the goods were smoothly exported.
Failing the flame retardant test is often not because there isn’t enough flame retardant, but because the formula balance isn’t adjusted properly — too much oil reduces the flame retardant effect, and the wrong auxiliary system also reduces it. Adjusting the formula is faster and cheaper than changing the system.
Check these four items when automotive materials arrive; odor and flame retardancy must be checked
- 1. Check the certification documents: material certificates, test reports, original copies or stamped copies;
- 2. Check VOC data: Interior parts require odor rating and VOC reports (e.g., VDA 270 odor rating);
- 3. Check weather resistance data: Outdoor parts require UV aging data (such as color difference and strength retention rate after 500h/1000h);
- 4. Batch sampling: Keep 500g from each batch for comparison under the same conditions in case of disputes.
Among the four items, certification documents and VOC data are most easily skipped with 'verbal commitments'.
VOC also has a batch risk: for the same grade, this batch passes, but if the next batch of additives comes from a different source, the data might fluctuate.
So when OEMs conduct audits, they like to see 'VOC reports for three consecutive batches'—not just one, but three.
When talking to suppliers, directly asking for the batch test records from the past six months is more effective than hearing a hundred times 'we meet the standards'.
—And these two items happen to be the strict thresholds for OEM audits.
| Checklist items | What are you looking at? | Acceptance Key Points |
|---|
| Certification documents | Material certificate, inspection report | Original or stamped copy, with a traceable number |
| VOC data | Odor Level, VOC Report | Match the level required by the OEM |
| Weathering data | Color difference and strength after UV aging | 500h/1000h Data Archiving |
| Batch sampling | Keep a 500g sample from each batch | Compare with the same environment when disputes arise |
Summary
The four thresholds for automotive TPE—weather resistance, temperature resistance, oil resistance, and certification. Passing each one avoids a pitfall. Save this for future reference.
Automotive TPE is not 'one kind of material,' it's 'a collection of materials for different positions': sealing strips use TPV, sheathing uses flame-retardant material, shock absorption uses TPEE, interior trim uses low VOC. Only when the position matches can you discuss the price; if the position doesn't match, even a lower price is still a burden.
Finally, let's do the math: a car has dozens of TPE parts, and if you save 2,000 yuan per ton on each, it doesn't add up to much in a year; but if one part is chosen incorrectly, scrapping, claims, and production stoppages can wipe out the whole year's savings in one go. This is the characteristic of automotive parts—the unit price of the material is a small proportion, while the cost of mistakes is high. Therefore, purchasing TPE for cars is not about who is cheaper, but about whose role is accurate and whose data is complete.
