件在常温下好好的，一上高温工况就软塌变形。TPE耐温没按真工况选，就是定时炸弹。
两种温度口径，差在哪？先分清再选料
“TPE 耐多少度”这个问题，不问清口径，答案全是错的。
TPE 耐温有两个口径：短期峰值温度，和长期连续使用温度。
| 口径 | 指什么 | 典型测试 |
|---|
| 短期峰值 | 短暂耐受不熔不裂 | 熔点 / 维卡软化点 |
| 长期连续 | 长时间使用性能不掉 | 热老化 1000h 后测强度/硬度/回弹 |
短期峰值看的是“会不会熔”，长期连续看的是“会不会老化”。
一个 TPE 短期能顶 200℃，长期连续使用可能只有 120℃——因为高温下分子链慢慢断、油分慢慢析，件越来越硬、越来越脆。
选型听长期连续使用温度，不听峰值。客户说“这个料要耐 150℃”，要追问一句：连续用多久？1 小时还是 1 年？答案完全不同。
技术金句：耐温别听熔点，听老化——件坏在'慢慢变脆'，不坏在'当场熔掉'。
判据一：100℃ 以下怎么选？主流体系都够
先把最常用的档位讲清楚：100℃ 以下的连续使用温度，是 TPE 的舒适区，主流体系基本都能覆盖：
| 体系 | 连续使用温度上限（参考） | 典型场景 |
|---|
| SBS 基 | 约 60-70℃ | 鞋材、玩具、日用品 |
| SEBS 基 | 约 80-100℃ | 护套、密封条、握把 |
| TPO | 约 90-100℃ | 汽车保险杠外饰、脚垫 |
| TPV | 约 125-135℃ | 汽车密封条、发动机舱周边 |
| TPU | 约 80-110℃（看硬度） | 线缆护套、脚轮 |
| TPEE | 约 125-150℃ | 波纹管、弹簧、耐热线缆 |
100℃ 以下，SEBS 基和 TPO 已经非常能打——成本可控、手感好、加工窗口宽。
选型时纠结“要不要上高温体系”，先问一句：连续工作温度真能到 100℃ 以上吗？到不了，SEBS 基就够了，上高温体系是白花钱。
顺带记住：“100℃ 以下随便选”的前提是连续使用、非极端介质——条件放宽，体系就要升级。
但注意一个细节：“100℃ 以下”还要叠加介质。同样的 90℃，接触空气和接触机油，寿命差几倍。介质会加速老化，选型时温度要打折扣。
汽车是 TPE 耐温的考卷：发动机舱、线束、密封条，处处是温度挑战。
行业里，发动机舱周边件常见要求 125℃ 连续使用，线束护套看整车厂标准（125℃ 是主流档位），密封条既要耐高温又要耐紫外。
这些要求不是拍脑袋定的，是整车厂按使用环境老化测试推出来的。
做汽车件，先问清楚客户按哪个标准验收——标准不同，同一个“耐温”含义差一档。
耐温怎么测？看懂热老化报告
耐温数据不是厂家拍脑袋，是测出来的。
最常见的测试是热老化试验：把料放进恒温烘箱，在设定温度下连续老化 1000 小时（约 42 天），然后测性能保留率——拉伸强度、
断裂伸长率、硬度、回弹，四项里任一项掉得太多，这个温度就不算“连续使用温度”。
看热老化报告，盯三个数字：
| 指标 | 看什么 | 合理范围 |
|---|
| 拉伸强度保留率 | 掉太多说明分子链断了 | ≥80%（1000h） |
| 断裂伸长率保留率 | 变脆的信号 | ≥60% |
| 硬度变化 | 变硬说明油分析出 | ≤+8A |
三个数字是“温度能不能长期扛”的直接证据。 厂家说“耐 135℃”，别只看牌号介绍，要这份热老化报告——报告里的保留率，比任何宣传语都诚实。
测试条件也有讲究：连续 1000h 和间歇 1000h（每天开关烘箱）结果不同；带负荷老化和无负荷老化也不同。问一句“怎么测的”，比问“能到多少度”更显专业。
判据二：100℃ 以上看体系？四档分水岭
超过 100℃，体系开始分化，四档看清楚：
头档 · 100-110℃：SEBS 基高端料勉强够，但余量小，不建议长期连续。这一档的真相是：能用，但容易踩线。
二档 · 110-135℃：TPV 的主场。EPDM 交联 + PP 骨架，耐老化、耐疲劳、压缩永久变形小，汽车密封条、线束护套大量在用。
125℃ 连续使用，是汽车线束和密封条的常见门槛，TPV 是主力答案。
三档 · 135-150℃：TPEE 和高端 TPV。TPEE 是结晶型聚酯弹性体，耐温高、回弹好、耐油，波纹管、弹簧、耐热线缆用得多；缺点是贵、加工窗口窄。
四档 · 150℃ 以上：TPEE 高端牌号和特种弹性体（聚酰亚胺弹性体等）。
连续使用温度再往上，TPE 就要让位给特种工程塑料弹性体系——这一档不是常规 TPE 的战场。
| 分档 | 温度范围 | 优先体系 | 别用 |
|---|
| 头档 | 100-110℃ | SEBS 高端 | SBS |
| 二档 | 110-135℃ | TPV | SEBS 普通级 |
| 三档 | 135-150℃ | TPEE / 高端 TPV | TPV 普通级 |
| 四档 | 150℃+ | 特种弹性体 | 常规 TPE |
口诀：100 以下 SEBS，100-135 看 TPV，135 以上 TPEE，150 以上换赛道。
判据三：低温段同样重要？零下 40℃ 是门槛
耐温不只管高温，低温是 TPE 的另一半考点。很多件不是热坏的，是冻裂的。
行业通行门槛是 -40℃：汽车外饰、户外设备、冷链密封，普遍要求 -40℃ 不脆裂、不失去弹性。这个温度，主流 TPE 体系基本都能过：
- SEBS 基：-50℃ 以下仍有弹性，低温是它的强项；
- TPV：-45℃ 左右，交联体系低温稍弱；
- TPEE：低温差一些，-40℃ 是边界，结晶度高容易变硬。
低温选型看两个动作：一是测 -40℃ 低温弯折（对折不断、无白痕）；二是看压缩永久变形在低温下的表现。
高温决定寿命，低温决定能不能用——南方选的料，北方冬天可能直接发脆。
另外提醒一句：低温测试别只看没断，还要看回弹恢复——弯折不断但弹不回来，密封照样失效。
耐温×耐油×硬度：三件事要一起看
耐温从来不是孤立指标，它和另外两件事联动：
耐温 × 耐油：接触机油的密封件，温度每高 10℃，油对材料的攻击就上一个台阶。TPV 耐油好，SEBS 基耐油一般——**“耐 120℃”和“耐 120℃ 机油”是两个料。
** 报工况时，介质一定要和温度一起报。
耐温 × 硬度：同样体系，硬度越高通常耐温余量越大——软料靠油分撑柔软，温度一高油分先跑。
要求又软又耐温的件，是 TPE 选型的难题区，往往要牺牲硬度或成本。
耐温 × 回弹：高温下的压缩永久变形，是密封件的寿命密码。同一个密封圈，25℃ 回弹 95%，100℃ 可能只剩 70%——选料看的是高温回弹，不是常温回弹。
| 组合 | 典型场景 | 优先体系 |
|---|
| 高温 + 耐油 | 发动机周边、齿轮箱 | TPV、TPEE |
| 高温 + 柔软 | 高温密封、耐热软管 | 高端 SEBS、TPV 软牌号 |
| 低温 + 耐油 | 北方户外油路件 | TPV、特种 SEBS |
报工况时，把“温度 + 介质 + 硬度”三项一次说全，供应商才能把体系锁到两三个以内；只说一个温度，对方只能在猜。
科隆客户案例：成本超标，重新匹配基材与加工温度
青岛一家改性料应用厂，材料成本超标，报价没竞争力，客户订单都快丢了。科隆过去一看：用的体系性能过剩——工况连续温度只有 80℃，用的却是高温体系，成本全花在“用不上的性能”上。
科隆配合重新匹配包胶基材与加工温度，在不牺牲耐温余量的前提下把体系降档，成本回到预算线内。耐温选型不是越高越好，是“够用 + 余量”——多花的钱买来用不上的耐温，是采购最大的隐性浪费。
温度、油、硬度一起过：五步定档
拿一张纸，按这个顺序走，耐温就选定了：
- 1. 连续使用温度多少℃？ 不确定就按“环境温度 + 10℃ 余量”算；
- 2. 峰值温度多少℃、持续多久？ 峰值只影响选型下限，不决定上限；
- 3. 接触什么介质？ 油、酸碱会加速老化，温度要再打折扣；
- 4. 低温要求多少？ 有 -40℃ 要求的，先圈定低温能过的体系；
- 5. 耐多久？ 3 年还是 10 年，热老化余量不同。
五步走完，体系基本锁死，再谈牌号。带工况去谈耐温，供应商才能给准答案；空手问“耐多少度”，谁答都是猜。
关于 TPE 耐温，三个高频误区，一次拆掉：
误区一：“耐温越高越好。” 不对。耐温高通常意味着成本高、加工窗口窄、手感变硬。
够用加 10-20℃ 余量，就是最优解；盲目追求高耐温，是拿真金白银买用不上的性能。
误区二：“熔点就是耐温。” 不对。熔点管“熔不熔”，不管“脆不脆”。很多料熔点 150℃+，连续使用温度只有 90℃——老化先于熔化把件废掉。耐温看老化，不看熔点。
误区三：“耐温是出厂就定死的。” 部分对。同体系内，配方微调（交联度、抗氧剂、油分）能改变耐温上限 10-20℃。
找改性厂调配方，比直接换体系省钱得多——先问能不能调，再考虑换。
三个误区拆完，再给采购一个动作：样品阶段就做 1000h 热老化预测试。
整批投产前，拿样品料先跑一轮热老化（或者让供应商提供同牌号的历史老化数据），确认保留率达标再放量。
热老化测试费，比投产后的批量退货便宜几十倍——这是耐温件采购最划算的一笔投入。
**补充一个低温细节：-40℃ 不是所有 TPE 都能过。
SEBS 基没问题，但部分 TPEE 高结晶牌号在 -40℃ 会变硬发脆——低温要求高的件，选料时把低温弯折测试写进验收条件**，
别默认“弹性体都耐低温”。
北方客户、冷链设备、户外密封，这一条尤其重要。
**耐温还有一个“看不见的指标”：耐臭氧和耐紫外。
户外件（汽车密封条、户外线缆）在日照下，臭氧和紫外线会加速老化——耐温测试过了，不代表耐候过了**。
户外场景要问“有没有耐候等级/紫外老化数据”，两个数据一起看才完整。
**再讲一个采购常犯的错：拿“峰值温度”当“连续温度”谈。
客户说“料要耐 150℃”，一问，其实是瞬时蒸汽消毒 150℃、每次 5 分钟——这跟连续 150℃ 是两回事，SEBS 高端料可能都够**。
把“多久一次、一次多久”问清楚，很多“高温难题”其实是伪命题，能省下换高温体系的钱。
最后一个动作：让供应商在报价单上写明“连续使用温度 + 测试依据”——写不出来的，报价再低都别急。耐温是硬指标，必须落到书面。
耐温选型，最后给一张自查清单：
| 问题 | 答案写这里 |
|---|
| 连续使用温度？ | ___℃ |
| 峰值温度与时长？ | ___℃ / ___h |
| 接触介质？ | 空气 / 油 / 酸碱 / 水 |
| 最低使用温度？ | ___℃ |
| 要求寿命？ | ___年 |
| 有没有整车厂/行业标准？ | ___ |
六行填完，拿着去问供应商，对方想糊弄都糊弄不了。 耐温选型没有捷径，但把工况问全，就是最快的路。
**再补一组实测概念：耐温数据怎么理解才不误解。
** 看到“耐 125℃”，别理解成“125℃ 随便用”——它通常指“125℃ 连续老化 1000h 后，性能保留率达到标准”；实际使用中，温度波动、介质腐蚀、机械应力会叠加，
工程上习惯再留 10-20% 的余量。
也就是说，标 125℃ 的料，设计时按 100-110℃ 用，才够稳。
对应地，验收时也按这个逻辑要求供应商：不仅要“耐 125℃”，还要“125℃ 老化 1000h 后，伸长率保留率 ≥60%”——把要求写细，供应商就没办法拿“峰值温度”糊弄你。
**最后补一句给设计：耐温和壁厚有关。
同样温度，薄壁件散热快、中心层温度低，厚壁件内部温度高、老化更快——厚壁密封件的耐温要求，要比薄壁件苛刻一档**。
图纸上写耐温要求时，别忘了标注壁厚。
**再补一个常见应用画像：线缆护套的耐温逻辑。
线缆护套按 UL/GB 标准分档，60℃、70℃、90℃、105℃、125℃ 是常见温度等级，每个等级对应不同的材料体系**——90℃ 级 SEBS 够用，105℃ 级要更耐的配方，125℃ 级通常要上 TPV 或交联料。
报“线缆护套”需求时，直接说等级（如“90℃ 等级”），供应商秒懂，比说“耐热护套”高效得多。
把这一篇的判据合并成一句话：先报连续温度，再看体系，最后定牌号。 顺序对了，耐温选型就不会乱。
**耐温是选出来的，不是问出来的——工况越具体，答案越精确。四档分水岭记牢，报温度不报体系，等于白报一场。
选对体系，耐温就赢了一半。**
小结
TPE选材的收尾动作就一个：带着工况去谈，不带工况去问，也欢迎转给需要的同事。
温度两个口径别混、四档分水岭记住、-40℃ 门槛别忘、五步决策走一遍——TPE 耐温这件事，就再也难不倒你。
总有人问：副牌料到底能不能用。
我们的回答一直没变——能用的地方很多，不能用的地方一处都不能碰。它和回料是两回事：一个是指标偏了，一个是分子链断了。
The part is fine at room temperature, but it becomes soft and deformed under high-temperature conditions. The TPE temperature resistance wasn’t selected according to the actual working conditions, it’s basically a time bomb.
Two types of temperature measurements, what's the difference? Understand first, then choose the material.
The question 'How much temperature can TPE withstand?' will have all wrong answers if the caliber is not specified.
TPE has two temperature ratings: short-term peak temperature and long-term continuous use temperature.
| Caliber | What does it refer to? | Typical test |
|---|
| Short-term peak | Briefly resistant without melting or cracking | Melting Point / Vicat Softening Point |
| long-term continuous | Performance does not degrade after long-term use | Measure strength/hardness/rebound after 1000 hours of heat aging |
The short-term peak looks at 'whether it will melt,' while the long-term continuous view looks at 'whether it will age.'
A TPE can withstand 200℃ for a short period, but for long-term continuous use it may only handle 120℃—because at high temperatures, molecular chains slowly break down, oils gradually separate, and the parts become harder and more brittle.
When selecting a material, consider its long-term continuous use temperature, not the peak value. When a customer says 'this material needs to withstand 150℃,' you need to ask: how long will it be used continuously? 1 hour or 1 year? The answers are completely different.
Technical saying: Don't listen to the melting point for temperature resistance, listen to aging — parts fail by 'gradually becoming brittle', not by 'melting on the spot'.
Criterion one: How to choose below 100℃? Mainstream systems are sufficient.
First, clearly explain the most commonly used settings: a continuous operating temperature below 100°C is the comfort zone for TPE, and most mainstream systems can cover this.
| system | Continuous use temperature limit (reference) | Typical scenario |
|---|
| SBS base | About 60-70℃ | Shoe materials, toys, daily necessities |
| SEBS base | About 80-100℃ | Sheath, sealing strip, handle |
| TPO | About 90-100℃ | Car bumper trim and floor mats |
| TPV | About 125-135°C | Car sealing strips, around the engine compartment |
| TPU | About 80-110°C (depending on hardness) | Cable sheath, caster |
| TPEE | About 125-150°C | Bellows, springs, heat-resistant cables |
Below 100℃, SEBS-based and TPO are already very competitive—cost is controllable, feel is good, and processing window is wide.
When choosing a model and hesitating about "whether to go for a high-temperature system," first ask: can the continuous operating temperature really reach above 100℃? If not, a SEBS base is sufficient; opting for a high-temperature system is a waste of money.
By the way, remember: the premise of 'anything below 100℃ is fine' is continuous use with non-extreme media—if the conditions are relaxed, the system needs to be upgraded.
But pay attention to one detail: 'below 100℃' also depends on the medium. At the same 90℃, the lifespan differs by several times between exposure to air and exposure to machine oil. The medium can accelerate aging, so the temperature needs to be discounted when selecting a model.
Cars are the temperature test for TPE: the engine compartment, wiring harnesses, and seals are all temperature challenges.
In the industry, common requirements for components around the engine compartment include continuous use at 125℃; the wiring harness sheaths follow the standards of the vehicle manufacturer (125℃ is the mainstream level); sealing strips need to be both high-temperature resistant and UV-resistant.
These requirements are not arbitrarily decided; they are derived by the vehicle manufacturers based on aging tests under usage conditions.
When making car parts, first clarify which standard the customer uses for acceptance—different standards mean the same 'temperature resistance' can differ by a grade.
How to test temperature resistance? Understanding the thermal aging report
The temperature resistance data is not made up by the manufacturer; it is measured.
The most common test is the heat aging test: put the material into a constant-temperature oven and continuously age it at a set temperature for 1000 hours (about 42 days), and then measure the performance retention rate—tensile strength,
If any of the four items—elongation at break, hardness, resilience—drop too much, this temperature cannot be considered the 'continuous use temperature'.
When looking at the heat-aging report, focus on three numbers:
| Indicator | What are you looking at? | reasonable range |
|---|
| Tensile Strength Retention Rate | Too much falling indicates that the molecular chains are broken. | ≥80% (1000h) |
| Retention rate of elongation at break | Signal of becoming brittle | ≥60% |
| Hardness change | Hardening indicates oil separation | ≤ 8A |
The three numbers are direct evidence of whether the temperature can be withstood long-term. The manufacturer says 'resistant to 135°C,' but don’t just look at the label description; ask for the heat aging report—the retention rate in the report is more honest than any slogan.
The testing conditions are also important: continuous 1000h and intermittent 1000h (turning the oven on and off daily) yield different results; aging with load and aging without load are also different. Asking 'how was it tested' appears more professional than asking 'how high can it go'.
Criterion Two: System check above 100℃? Four-level dividing line
Above 100℃, the system begins to differentiate. Pay attention to the four levels:
Top level · 100-110℃: SEBS-based high-end materials are barely sufficient, but the margin is small, and long-term continuous use is not recommended. The truth about this level is: it can be used, but it's easy to push the limits.
Second gear · 110-135°C: The main field of TPV. EPDM crosslinked PP skeleton, resistant to aging, fatigue, and low permanent compression deformation, widely used in automotive seals and harness sheaths.
Continuous use at 125℃ is a common threshold for automotive wiring harnesses and sealing strips, and TPV is the main solution.
Level 3 · 135-150℃: TPEE and high-end TPV. TPEE is a crystalline polyester elastomer, with high temperature resistance, good resilience, and oil resistance. It is commonly used in corrugated tubes, springs, and heat-resistant cables; the drawbacks are that it is expensive and has a narrow processing window.
Level 4 · Above 150℃: High-end grades of TPEE and specialty elastomers (such as polyimide elastomers).
When the continuous usage temperature goes even higher, TPE has to give way to special engineering plastic elastomer systems — this range is not the battlefield of conventional TPE.
| grading | Temperature range | Priority system | Don't use |
|---|
| front page | 100-110℃ | SEBS High-end | SBS |
| Second gear | 110-135℃ | TPV | SEBS General Grade |
| Level 3 | 135-150 °C | TPEE / High-end TPV | TPV Standard grade |
| Level 4 | 150°C + | Special Elastomer | Conventional, TPE |
Mnemonic: SEBS below 100, TPV at 100-135, TPEE above 135, switch to the track above 150.
Criterion 3: Is the low-temperature segment equally important? -40°C is the threshold
Temperature resistance is not just about high temperatures; low temperatures are another key point for TPE. Many parts are not damaged by heat but cracked by freezing.
Industry standard threshold is -40°C: automotive exteriors, outdoor equipment, cold chain seals, generally requiring -40°C not to crack or lose elasticity. At this temperature, mainstream TPE systems can basically pass:
- SEBS base; below -50°C there is still elasticity, with low temperatures being its strength;
- TPV: Around -45°C, cross-linked systems have slightly weaker low temperatures;
- TPEE: Low temperatures are a bit different; -40°C is the boundary, and high crystallinity makes it harder.
Low temperature selection involves two actions: first, test for bending at -40°C (no folding in half, no white marks); second, observe how compression permanent deformation behaves at low temperatures.
High temperature determines lifespan, low temperature determines usability—materials chosen in the south may become brittle in northern winters.
One more reminder: don't just look at whether the material breaks in low temperatures, also look for rebound recovery—if it bends but doesn't bounce back, the seal will still fail.
Temperature resistance× oil resistance×hardness: three things to consider together .
Temperature resistance has never been an isolated indicator; it is linked with two other factors:
Temperature Resistance × Oil resistance: seals in contact with engine oil. For every 10°C increase in temperature, the oil's attack on the material goes up to a new level. TPV has good oil resistance, while SEBS base has average oil resistance—**"120°C resistance" and "120°C engine oil" are two different materials.
** When reporting operating conditions, the medium must be reported together with temperature.
Temperature Resistance × Hardness: In the same system, higher hardness usually means greater temperature resistance margin—soft materials are supported by oil components, and when the temperature rises, oil leaks first.
Components that are both soft and temperature-resistant are a major challenge in TPE selection, often requiring sacrifices on hardness or cost.
Temperature Resistance × Rebound: Permanent compression deformation at high temperatures is the key to sealing lifespan. For the same sealing ring, 95% rebound at 25°C, and at 100°C it may only be 70%—material selection focuses on high-temperature rebound, not room temperature rebound.
| Combination | Typical Scenarios | Priority System |
|---|
| High Temperature + Oil Resistance | Engine Peripheral , Gearbox | TPV, TPEE |
| High Temperature + Soft | High-Temperature Sealing, Heat-Resistant Hose | High-end SEBS, TPV soft grades |
| Low Temperature + Oil Resistance | Northern Outdoor Oil Circuit Parts | TPV, Special SEBS |
When reporting operating conditions, explain all three items at once: "temperature + medium + hardness" so suppliers can lock the system within two or three units; If you only mention one temperature, the other party can only guess.
Cologne customer case: cost exceeds standard, rematching substrate and processing temperature
A modified material application factory in Qingdao has material costs exceeding standards, uncompetitive pricing, and nearly losing customer orders. Cologne looked over and found that the system was overperforming—continuous temperature at only 80°C, but using a high-temperature system, with all costs spent on "unusable performance."
Cologne cooperated to rematch the overmolding substrate and processing temperature, downgrading the system without sacrificing temperature resistance margin, bringing costs back within budget. Temperature resistance selection is not about higher quality but "sufficient + margin"—spending extra money to buy unusable temperature resistance is the biggest hidden waste in procurement.
Temperature, oil, and hardness all together: Five steps to set the temperature
Take a piece of paper and follow this order, and the temperature resistance will be selected:
- 1. What is the continuous operating temperature? If unsure, calculate as "ambient temperature + 10°C margin";
- 2. What is the peak temperature, and how long will it last? The peak temperature only affects the lower limit of the selection and does not determine the upper limit;
- 3. What medium will it contact? Oil and acidic bases will accelerate aging, so the temperature should be further reduced;
- 4. What is the minimum temperature requirement? If there is a -40°C requirement, first define the system that can withstand low temperatures;
- 5. How long does it last? Whether it's 3 years or 10 years, the thermal aging margin differs.
After completing five steps, the system is basically locked, then discussing the grade. Discuss temperature resistance based on operating conditions, so suppliers can give accurate answers; If you ask "how many degrees it can withstand," anyone will guess.
Regarding TPE temperature resistance, three frequent misconceptions, all at once:
Misconception 1: "The higher the temperature resistance, the better." "No." High temperature resistance usually means higher costs, narrower processing windows, and a harder feel.
Enough plus a 10-20°C margin is the optimal solution; Blindly pursuing high temperature resistance is like spending real money on unusable performance.
Misconception 2: "Melting point is temperature resistance." " That's not right. Whether a melting-point tube melts or not doesn't matter if it's "brittle or not." Many materials have a melting point of 150°C+, but continuous use temperature is only 90°C—aging occurs before melting and ruining the part. Temperature resistance depends on aging, not melting point.
Misconception 3: "Temperature resistance is fixed right from the factory." " Part of it is correct. Within the same system, fine-tuning the formula (crosslinking, antioxidant, oil content) can change the upper temperature resistance limit by 10-20°C.
Adjusting the formula at a modified factory saves much more than directly changing the system—first ask if adjustment is possible, then consider switching.
After dismantling these three misconceptions, take another step for procurement: conduct a 1000-hour thermal aging pre-test during the sample stage.
Before the whole batch goes into production, take sample materials and run a round of thermal aging (or ask suppliers to provide historical aging data for the same grade), confirm retention rate meets standards, then scale up the volume.
Thermal aging testing fees are dozens of times cheaper than batch returns after production start—this is the most cost-effective investment in purchasing heat-resistant parts.
** adds a detail about low temperatures: not all TPEs can pass -40°C.
SEBS base is fine, but some high-crystalline TPEE grades become hard and brittle at -40°C—for parts with high low-temperature requirements, include low-temperature bending tests in the acceptance criteria when selecting materials.
Don't assume "all elastomers are low-temperature resistant."
Northern customers, cold chain equipment, outdoor sealing—this is especially important.
** There is also an "invisible indicator" for temperature resistance: ozone resistance and UV resistance.
Outdoor components (automotive seals, outdoor cables) under sunlight accelerate ozone and UV aging—just because the temperature test has passed doesn't mean the weather resistance has passed.
For outdoor scenarios, ask "Is there weather resistance rating/UV aging data?" to look at both data together for complete results.
** Another common purchasing mistake: treating "peak temperature" as "continuous temperature."
The client says "the material must withstand 150°C," but when asked, it's actually instant steam sterilization at 150°C, 5 minutes each time—this is different from continuous 150°C; SEBS high-end materials might be good enough.
Ask clearly about "how often and how long," many "high-temperature problems" are actually false propositions, saving money on switching to high-temperature systems.
The final step: have suppliers write "continuous usage temperature + test basis" on the quotation — if you can't write it, don't rush even if the quote is low. Temperature resistance is a hard indicator and must be documented.
Temperature Resistance Selection, Finally, here's a self-checklist:
| Question | Answer written here |
|---|
| Continuous operating temperature? | ___°C |
| Peak temperature and duration? | ___°C / ___h |
| Contact medium? | Air / Oil / Acids and Alkalis / Water |
| Minimum operating temperature? | ___°C |
| Required lifespan? | ___ year |
| Is there a manufacturer/industry standard? | ___ |
After filling out six lines, take it and ask the supplier; they can't fool you even if they want to. There's no shortcut to selecting a temperature-resistant model, but asking about all operating conditions is the fastest way.
** Here's another set of real-world test concepts: how to interpret temperature resistance data so you don't get misunderstood.
** When you see "125°C endurance," don't misunderstand it as "125°C can be used however you want"—it usually means "after 125°C continuous aging for 1000 hours, performance retention rate meets the standard"; In actual use, temperature fluctuations, medium corrosion, and mechanical stress accumulate , so
engineers tend to leave an extra 10-20% margin.
In other words, for materials rated at 125°C, the design should use them at 100-110°C for stability.
Correspondingly, acceptance requires suppliers to follow this logic: not only must they "withstand 125°C," but also "after aging at 1000 hours at 125°C, the elongation retention rate must be ≥60%"—if the requirements are detailed, suppliers won't be able to fool you with "peak temperature."
** One last thing to the design: temperature resistance is related to wall thickness.
At the same temperature, thin-walled parts dissipate heat quickly and have a lower center layer temperature; thick-walled parts have higher internal temperatures and faster aging—the temperature resistance requirements for thick-walled seals are a notch higher than those for thin-walled parts.
When the drawings specify temperature resistance requirements, don't forget to specify the wall thickness.
** Here's another common application profile: the temperature resistance logic of cable sheaths.
Cable sheaths are classified according to UL/GB standards: 60°C, 70°C, 90°C, 105°C, and 125°C are common temperature grades, each corresponding to a different material system**—90°C SEBS is sufficient, 105°C requires more durable formulas, and 125°C usually requires TPV or cross-linked material.
When reporting a "cable sheath" request, directly state the grade (e.g., "90°C grade"), and the supplier immediately understands, which is much more efficient than saying "heat-resistant sheath."
consolidated the criteria from this article into one sentence: first report the continuous temperature, then look at the system, and finally decide on the grade. If the order is correct, the temperature resistance selection will not be confusing.
**Temperature resistance is selected, not asked—the more specific the operating conditions, the more precise the answer. Remember the four watershed levels: reporting temperature but not system is essentially a wasted report.
Choose the right system and win half the way for temperature resistance. **
Summary
TPE The final step in material selection is simple: discuss with operating conditions in mind, ask without conditions, and feel free to share with colleagues who need it.
Don't mix two temperature standards, remember the four-level watershed, remember the -40°C threshold, go through the five-step decision-making process—TPE temperature resistance is no longer a problem for you.
People always ask: Can secondary grade materials be used?
Our answer has never changed—there are many places where it can be used, but not a single place where it can't be touched. It's different from recycled materials: one is the indicator is off, the other is the molecular chain is broken
