密封条图省事用了SEBS，三年后压得回不来直漏风。TPV的压变数据没看，密封件就是赌。
TPV 和橡胶，差在哪？一句话结论
TPV（热塑性硫化橡胶）是 TPE 家族里的“密封条之王”，它的对手是传统硫化橡胶（EPDM 是代表）。
一句话：TPV 用动态硫化把橡胶交联好了，再塞进塑料的加工体系——弹性接近橡胶，效率吊打橡胶，但极端工况仍要让位给橡胶。
动态硫化是 TPV 的灵魂：EPDM 在 PP 基体里边交联边共混，橡胶微粒均匀分散在塑料相里。
结果是：橡胶的弹性还在，塑料的加工性也有了——能注塑、能挤出、能回收，这是传统硫化橡胶做不到的。
技术金句：TPV 是把橡胶“提前交联好”再卖给注塑机——弹性没少，效率翻倍，这就是它王位的来源。
TPV 的诞生，本质是为了解决橡胶行业的两大痛点：慢和脏。
传统橡胶要硫化，硫化要加热、要等时间，一个密封件从混炼到成品几十分钟起步；硫化过程还会产生气味和废料，
车间环境差。
TPV 把交联这道工序提前做完了——买回来的料，注塑机里一打几十秒出件，废料还能回用。
它能吃掉橡胶市场，靠的不是性能碾压（性能上和 EPDM 半斤八两），而是“把橡胶的活，干出了塑料的速度”。
判据一：硬度与手感，谁更像密封件
| 硬度区间 | TPV 手感 | EPDM 橡胶手感 |
|---|
| Shore A 50-60 | 韧弹，干爽 | 弹，微粘 |
| Shore A 70-80 | 密封条主力，回弹好 | 密封条经典手感 |
| Shore A 90+ | 硬弹，可做垫片 | 少见 |
TPV 的手感偏“干弹”，橡胶偏“糯弹”——TPV 表面不发粘、不析出，这是它敢进汽车密封条的原因之一。
压缩永久变形（CS）是密封件的灵魂指标：TPV 的 CS 一般能到 20-30%（70℃×22h），和 EPDM 同一档，远超普通 SEBS 基。
手感选型提醒：要“橡胶的糯”，选 TPV 要适应它的干爽；要“回弹扛压”，TPV 完全够格。别拿 SEBS 基的软糯预期来要求 TPV——它俩性格不同。
测 TPV 的压缩永久变形，方法和温度一定要对齐。同样是 70℃×22h，A 厂家测出 25%，B 厂家测出 35%，可能不是料差一档，而是样品厚度、预压缩量不同。
行业里常见的坑，是拿不同条件的 CS 数据直接比——选型时一定要确认测试条件一致，建议让供应商按同一标准出数据。
CS 这个数字，条件不对就没有可比性。
判据二：温度、介质、寿命，三张硬牌
| 判据 | TPV | EPDM 橡胶 |
|---|
| 连续耐温 | 125-135℃ | 135-150℃ |
| 峰值耐温 | 150℃ 短时 | 160℃+ |
| 耐油 | 好 | 好 |
| 耐臭氧/耐候 | 好 | 好 |
| 压缩永久变形 | 20-30% | 15-25% |
| 长期寿命 | 好 | 好（略优） |
耐温上，TPV 略逊 EPDM 半档——125℃ 连续是 TPV 的舒适区，往 150℃ 走就要看牌号；但 90% 的密封场景在 135℃ 以内，TPV 完全够用。
耐油是 TPV 的另一张硬牌：发动机舱的油路件、齿轮箱密封，TPV 泡油不溶胀。
要“耐温+耐油+可注塑”三合一，TPV 是现成的答案——橡胶做得到前两项，做不到第三项。
寿命维度：热老化 1000h 测试，TPV 的强度保留率普遍优秀，密封条用 10 年的工况，它接得住。
汽车轻量化和新能源化，正在扩大 TPV 的用量——电池包的密封、电机的减震、线束的护套，新能源车上 TPV 单台用量比燃油车多出不少。
做汽车零部件配套的厂，提前把 TPV 的牌号、认证、量产经验攒起来，能接住这波增长。
TPV 的另一个隐藏优势是耐臭氧。
橡胶怕臭氧，尤其在沿海城市、高压电器附近，臭氧浓度高，普通橡胶几年就龟裂——TPV 因为交联充分、表面致密，
耐臭氧能力明显更好。
这也是为什么户外密封、电气设备密封越来越多地改用 TPV。
选型时如果工况在沿海或户外，把“耐臭氧”作为加分项写进需求，比笼统说“要耐候”更精准。
判据三：工艺与成本，效率账算清楚
| 对比项 | TPV | EPDM 橡胶 |
|---|
| 成型方式 | 注塑/挤出 | 硫化成型 |
| 成型周期 | 秒级 | 分钟级 |
| 废料回收 | 可回用 | 难 |
| 模具 | 注塑模 | 硫化模 |
| 单件成本 | 中 | 高（人工/能耗） |
| 设备投入 | 常规注塑机 | 硫化设备 |
TPV 替代橡胶的核心账在效率：同规格密封条，注塑周期几十秒 vs 硫化几分钟，产能能差好几倍；废料还能回用。
很多厂换 TPV，不是看材料性能，是算完周期和人工的账——省的不只是料钱，是整条产线的产出。
但注意：极端高温（连续 150℃+）、强溶剂、超高回弹要求的件，橡胶仍不可替代——TPV 替代的是“够用”的橡胶，不是全部橡胶。
算一笔设备投入的账：一条 EPDM 硫化线，密炼机、开炼机、硫化机、模具全套下来投资不低，还要养橡胶配方师；换成 TPV，
常规注塑机就能干，模具便宜、周期短、人工省。
很多中小企业就是被设备门槛挡在橡胶门外的——做不了硫化，就只能外购橡胶件，成本高还受制于人。
换成 TPV 之后自己注塑就能做，把供应链掌握在自己手里。
什么时候上TPV、什么时候还用橡胶
| 场景 | 选谁 | 理由 |
|---|
| 汽车门窗密封条 | TPV | 耐候耐温、可注塑 |
| 线束护套、发动机舱件 | TPV | 耐油耐温 125℃ |
| 家电密封圈 | TPV | 压缩变形好 |
| 连续 150℃+ 工况 | EPDM/硅胶 | 温度边界外 |
| 强溶剂、超高回弹 | 特种橡胶 | TPV 到顶 |
| 便宜密封（非严苛） | SEBS 基 | 成本更低 |
决策顺序：先问连续温度（135℃ 以内 TPV 胜）、再问介质（耐油 TPV 胜）、三问寿命（两者都好）、最后算效率账（TPV 完胜）。
TPV 的价格和它的交联度、EPDM 含量直接相关——便宜的 TPV，往往是把 EPDM 含量做低、PP 含量做高，弹性打折。
同样标称 70A 的两个牌号，一个 EPDM 含量 60%，一个 40%，TPV 的拉伸强度一般在 8-15 MPa，断裂伸长率 300%-500%，比 EPDM 略低但足够密封条用。
硬度验收每批留样 6mm 厚试片，23℃ 测 Shore A，±3A 以内才放行——同一批硬度波动超 ±3A，装到车上密封条手感就分层。
所以 TPV 的验收，别只看硬度和外观，一定要看 CS 和热老化数据——这两个数，才是 TPV 真材实料的照妖镜。
TPV 和 SEBS 基怎么选？
这两个都是密封条常用料，但定位不同——SEBS 基便宜、手感软，适合门缝条、窗框条这类低应力密封；TPV 耐温高、CS 好，适合汽车密封、
发动机舱件这类严苛工况。
简单记：静态密封、温度低、要便宜的，SEBS 基；动态密封、温度高、要寿命的，TPV。把“动”和“静”两个字记住，密封条选型就赢了一半。
科隆客户案例：收缩率不稳，小批试产先验证
重庆一家汽车零部件厂，TPV 件收缩率不稳，尺寸波动大，客户不敢放量。科隆配合做小批试产验证——先锁牌号、再锁工艺窗口，确认尺寸稳定后再放量，客户连续三个批次续单。
TPV 的尺寸稳定性，一半在料一半在工艺——料定了，模温、保压、冷却时间不锁死，收缩率照样飘。小批试产这一步，是 TPV 件上量前最值钱的动作。
TPV到货三笔账对不对，压变数据必看
- 1. 问牌号体系：EPDM 基 TPV 和 PP 基 TPV 性格不同，先确认是哪个体系；
- 2. 问 CS 数据：压缩永久变形是密封件首要指标，要同温同压的数据；
- 3. 问耐油数据：泡什么油、多少度、多久？数据齐全再下单；
- 4. 验收：批次留样 + 试产验证 + CS/硬度对照 TDS。
TPV 的验收，别只测硬度——CS、热老化保留率、耐油增重率三个数一起看，才是密封件该有的验收。
TPV 的牌号命名各家不同，报硬度时顺便报测试标准，两个牌号才比得起来——标准不一，数字就是数字，不是结论。
TPV 的回收回用，是它成本优势的一部分，但回用比例要控制——业内一般建议回用料掺混比例不超过 15%-20%，掺多了交联度下降，
压缩永久变形变差。
签合同时把“新料/回用料比例”写清楚，别让“可回收”三个字变成品质隐患。
小结
TPV的好材料不难找，难的是判断力——判断力，是拿工况一遍遍喂出来的。
TPV 是密封条之王的底气在动态硫化：弹性靠交联、效率靠注塑、寿命靠耐温耐油。极端工况让位橡胶，常规密封它称王——边界清楚，选型就赢。
三行说清我们是谁：
改性能——改性热塑性弹性体、改性尼龙（PA6 / PA66 / PA46 / PA11 / PA12 / PA6T / PA9T 及尼龙合金）、改性 PPO / PPS；
有货源——各大化工巨头尼龙树脂、副牌料、大包料现货；
给判断——什么件，用什么料。
The seal strip uses SEBS for convenience, but after three years it gets compressed and won't spring back, causing air leaks. I haven't looked at the compression data for TPV; seals are just a gamble.
TPV and rubber, what's the difference? A one-sentence conclusion
TPV (Thermoplastic Vulcanizates) is the 'king of sealing strips' in the TPE family, and its competitor is traditional vulcanized rubber (with EPDM being the representative).
In one sentence: TPV uses dynamic vulcanization to crosslink rubber, then stuffs it into a plastic processing system — elasticity close to rubber, efficiency far surpassing rubber, but in extreme conditions it still yields to rubber.
Dynamic vulcanization is the soul of TPV: EPDM crosslinks while blending in the PP matrix, and the rubber particles are uniformly dispersed in the plastic phase.
The result is: the elasticity of rubber is still there, and the processability of plastic is also achieved—it can be injection molded, extruded, and recycled, which is something traditional vulcanized rubber cannot do.
Tech catchphrase: TPV is rubber that is 'pre-crosslinked' before being sold to injection molding machines — elasticity is not reduced, efficiency is doubled; this is the source of its throne.
The birth of TPV was essentially to address two major pain points in the rubber industry: slow and dirty.
Traditional rubber needs vulcanization, which requires heating and waiting time. It takes at least several tens of minutes for a seal from mixing to finished product; the vulcanization process also produces odors and waste.
The workshop environment is poor.
TPV completed the cross-linking process in advance — the purchased material can be injected in the molding machine in just a few tens of seconds per piece, and the scrap can still be reused.
Its ability to eat into the rubber market doesn't rely on performance domination (performance is roughly on par with EPDM), but on 'doing the work of rubber at the speed of plastic'.
Criterion One: Hardness and Hand Feel, Which Is More Like a Seal
| Hardness range | TPV texture | EPDM rubber feel |
|---|
| Shore A 50-60 | Tough and resilient, dry | Elastic, slightly sticky |
| Shore A 70-80 | Main sealing strip, good resilience | Classic feel of the sealing strip |
| Shore A 90 | Hard spring, can be used as a shim | Rare |
The feel of TPV is relatively 'dry and elastic,' while the rubber is more 'soft and elastic'—TPV surfaces are not sticky and do not exude substances, which is one of the reasons it is used in automotive sealing strips.
Compression set (CS) is the key indicator of a seal: the CS of TPV can generally reach 20-30% (70°C × 22h), on par with EPDM, far exceeding ordinary SEBS-based materials.
Touch selection reminder: For a 'rubbery and soft' feel, choosing TPV requires adapting to its dryness; for 'resilient and pressure-resistant', TPV is fully qualified. Don't expect TPV to meet the soft and sticky expectation of SEBS-based materials—they have different characteristics.
When testing the compression set of TPV, the method and temperature must be aligned. Even at 70°C × 22h, Manufacturer A measured 25% while Manufacturer B measured 35%. The difference may not be due to the material grade, but rather differences in sample thickness or pre-compression amount.
A common pitfall in the industry is directly comparing CS data from different conditions — when selecting products, you must ensure that the test conditions are consistent, and it is recommended to have suppliers provide data according to the same standard.
This CS number is not comparable if the conditions are not right.
Criterion Two: Temperature, medium, lifespan, three hard cards
| Criterion | TPV | EPDM Rubber |
|---|
| Continuous temperature resistance | 125-135℃ | 135-150℃ |
| Peak Temperature Resistance | 150℃ for a short time | 160℃ |
| Oil-resistant | Good | Good |
| Ozone-resistant / Weather-resistant | Good | Good |
| Compression set | 20-30% | 15-25% |
| Long lifespan | Good | Good (slightly better) |
In terms of temperature resistance, TPV is slightly inferior to EPDM by about half a grade—125°C continuous is TPV's comfort zone, and approaching 150°C depends on the grade; however, 90% of sealing scenarios are below 135°C, so TPV is completely sufficient.
Oil resistance is another strong suit of TPV: in the engine compartment's oil circuits and gearbox seals, TPV does not swell when exposed to oil.
If you want 'temperature-resistant, oil-resistant, and moldable' all in one, TPV is the ready-made answer — rubber can achieve the first two, but not the third.
Lifespan dimension: In the 1000-hour thermal aging test, the strength retention rate of TPV is generally excellent. For seals with a 10-year service lifespan, it can handle the conditions.
The lightweighting and electrification of vehicles are increasing the use of TPV — sealing for battery packs, vibration damping for motors, and sheathing for wiring harnesses. The amount of TPV used per new energy vehicle is significantly higher than that in conventional fuel vehicles.
For factories that produce automotive parts, if they accumulate TPV grades, certifications, and mass production experience in advance, they will be able to catch this wave of growth.
Another hidden advantage of TPV is ozone resistance.
Rubber is sensitive to ozone, especially in coastal cities and near high-voltage electrical equipment, where ozone concentrations are high, and ordinary rubber cracks within a few years — TPV, because it is fully cross-linked and has a dense surface,
The resistance to ozone is significantly better.
This is also why outdoor sealing and electrical equipment sealing are increasingly being replaced with TPV.
When selecting models, if the working conditions are coastal or outdoors, including 'ozone resistance' as a bonus requirement in the specifications is more precise than vaguely saying 'should be weather-resistant'.
Criterion Three: Process and Cost, Efficiency Accounted Clearly
| Comparison item | TPV | EPDM Rubber |
|---|
| Molding method | Injection Molding/Extrusion | Vulcanization molding |
| Molding cycle | millisecond-level | minute-level |
| Waste Recycling | Reusable | Difficult |
| Mold | injection mold | vulcanizing mold |
| Unit cost | middle | High (manual/energy consumption) |
| Equipment Investment | Conventional injection molding machine | Sulfurization equipment |
The core advantage of TPV over rubber lies in efficiency: for the same specification of sealing strips, injection molding cycles take tens of seconds versus several minutes for vulcanization, resulting in a production capacity several times higher; waste material can also be recycled.
Many factories switch to TPV not because of the material performance, but after calculating the cycle time and labor costs—it’s not just saving on material costs, but the output of the entire production line.
But note: For extremely high temperatures (continuous 150°C), strong solvents, and parts with ultra-high rebound requirements, rubber still cannot be replaced—TPV replaces rubber that is 'good enough,' not all rubber.
Calculating the investment in equipment: for an EPDM vulcanization line, with a full set of internal mixers, open mill, vulcanizer, and molds, the investment is not small, and you also need to hire a rubber formulist; if you switch to TPV,
A conventional injection molding machine can handle it, the mold is cheap, the cycle is short, and labor is saved.
Many small and medium-sized enterprises are blocked from entering the rubber industry by equipment thresholds — if they can't carry out vulcanization, they can only purchase rubber parts externally, which is costly and leaves them dependent on others.
After switching to TPV, we can do the injection molding ourselves and keep the supply chain under our own control.
When to use TPV, and when to still use rubber
| Scene | Who to choose | Reason |
|---|
| Car door and window seals | TPV | Weather-resistant and temperature-resistant, suitable for injection molding |
| Wiring harness sleeves, engine compartment parts | TPV | Oil-resistant and heat-resistant 125℃ |
| Appliance sealing ring | TPV | Good compression deformation |
| Continuous 150℃ operating condition | EPDM/Silicone | Outside the temperature boundary |
| Strong solvent, ultra-high rebound | Specialty rubber | TPV reached the top |
| Cheap sealing (not strict) | SEBS base | Lower cost |
Decision sequence: first ask about continuous temperature (TPV wins under 135℃), then ask about the medium (oil-resistant TPV wins), third ask about lifespan (both are good), and finally calculate the efficiency account (TPV completely wins).
The price of TPV is directly related to its degree of crosslinking and EPDM content—cheaper TPV often has lower EPDM content and higher PP content, compromising elasticity.
Two grades both labeled 70A, one with 60% EPDM content and the other with 40%, TPV generally has a tensile strength of 8-15 MPa and an elongation at break of 300%-500%, slightly lower than EPDM but sufficient for use in seals.
For hardness acceptance, retain a 6mm thick test piece from each batch, measure Shore A at 23°C, and only release if within ±3A — if the hardness of the same batch fluctuates more than ±3A, the sealing strip installed on the vehicle will feel layered to the touch.
So for the acceptance of TPV, don’t just look at hardness and appearance; you must check CS and heat aging data—these two numbers are the real truth test for TPV.
How to choose between TPV and SEBS base?
These two are both commonly used materials for sealing strips, but they have different positions—SEBS-based is cheap and soft to the touch, suitable for low-stress seals like door gaps and window frames; TPV has high temperature resistance and good compression set, suitable for automotive sealing.
These are harsh operating conditions for engine compartment components.
Simply remember: for static sealing, low temperature, and cheap cost, use SEBS; for dynamic sealing, high temperature, and long life, use TPV. Just remember the words 'dynamic' and 'static,' and you'll have won half the battle in choosing sealing strips.
Cologne Customer Case: Unstable Shrinkage Rate, Small Batch Trial Production First for Verification
A Chongqing auto parts factory had unstable shrinkage rates for TPV parts, with large dimensional fluctuations, so the customer was reluctant to increase orders. Cologne cooperated to conduct small-batch trial production validation — first locking the grade, then locking the process window. After confirming dimensional stability, the customer continued to place orders for three consecutive batches.
The dimensional stability of TPV is half determined by the material and half by the process—once the material is fixed, if mold temperature, holding pressure, and cooling time are not locked, the shrinkage rate will still fluctuate. This step of small-batch trial production is the most valuable action before scaling up TPV parts.
Are the three TPV arrival entries correct? Must check the pressure and transformation data.
- 1. Inquiry about the grade system: EPDM-based TPV and PP-based TPV have different characteristics, so first confirm which system it is;
- 2. Ask CS data: Compressive permanent deformation is the primary indicator for seals, and the data should be at the same temperature and pressure.
- 3. Ask for oil resistance data: what kind of oil to soak, at what temperature, and for how long? Place the order only after all the data is complete;
- 4. Acceptance: batch sample retention, trial production verification, CS/hardness comparison with TDS.
When inspecting TPV, don't just test hardness—look at CS, heat aging retention, and oil resistance weight gain together; only then is it the proper acceptance for sealing parts.
Different manufacturers have different naming conventions for TPV grades. When reporting hardness, the test standard should be reported as well. Only then can two grades be compared—the numbers alone are just numbers, not a conclusion.
The recycling and reuse of TPV is part of its cost advantage, but the reuse ratio needs to be controlled—industry generally recommends that the proportion of recycled material mixed in should not exceed 15%-20%, as adding more will reduce the degree of crosslinking.
Compression permanent deformation deteriorates.
Make sure to clearly state the 'ratio of new material to recycled material' when signing the contract, so that the words 'recyclable' do not become a quality risk.
Summary
Good TPV materials are not hard to find; what is difficult is judgment — judgment comes from repeatedly feeding the working conditions.
TPV is the confidence of the king of sealing strips in dynamic vulcanization: elasticity depends on cross-linking, efficiency depends on injection molding, and durability depends on temperature and oil resistance. Extreme conditions are left to rubber, while for conventional sealing it reigns supreme—boundaries are clear, and choosing the right type guarantees success.
Explain who we are in three lines:
Performance modification — modified thermoplastic elastomers, modified nylon (PA6 / PA66 / PA46 / PA11 / PA12 / PA6T / PA9T and nylon alloys), modified PPO / PPS;
Stock available — major chemical giants' nylon resin, secondary brand materials, and bulk materials are in stock;
To make a judgment—what item, what material to use.
