密封条用 SEBS 凑合，三年后压得回不来直漏风。TPV 和 TPE 的差别，全在压变那一项。
TPV 的“硫化”技术是它的立身之本：EPDM 橡胶在 PP 里动态硫化，形成微米级交联粒子。
这个工艺让 TPV 有了橡胶的回弹、塑料的加工——“硫化”两个字，是 TPV 和普通 TPE 的分水岭。
TPV 和普通 TPE 的“外观”差异：TPV 表面是橡胶质感，SEBS 基偏塑料质感。包胶件要哪种质感，先定——质感选错，客户一看就退货。
TPV 的“手感”调校：TPV 可以做到软弹，但和 SEBS 的软糯是两种感觉。密封件无所谓，包胶件（方向盘、工具手柄）就讲究——包胶场景，先摸样品再定体系。
TPV 的“硬度范围”：TPV 常见 Shore 40A-50D，比 SEBS 基窄一些。要极软（00-20A）的件，TPV 不一定够软——极软场景，SEBS 基更合适。
TPV 的“重量”优势：TPV 比橡胶轻，密封件减重对汽车油耗、电动车续航有意义。轻量化的账，TPV 帮客户算得动——减重就是降本。
TPV 的“成本”结构：TPV 贵在硫化工艺和交联体系。但密封件寿命长、返修少，总账划算——比单价前，先比寿命。
TPV 的“对比”：TPE 拼手感，TPV 拼耐油，TPEE 拼疲劳——三兄弟各管一摊，按岗位选。
TPV 的“数据”三件套：压变曲线、老化曲线、介质清单——三样齐的 TPV 方案，才算完整。
TPV 的交联度直接反映在压变曲线上：同牌号批间交联度一飘，压变能差出 8-10 个百分点；验收时把 125℃×22h 的高温压变一起要，别只看常温值。
一句话结论：TPV 是 TPE 的“硫化加强版”，密封场景它更稳
TPV（热塑性硫化橡胶）是 TPE 家族里的特殊一员：EPDM 橡胶在 PP 基体里动态硫化，形成交联橡胶微粒。
它保留了 TPE 的热塑性（能注塑、能回收），又拿到了橡胶的交联性能（耐油、耐温、压缩永久变形好）。
| 维度 | TPE（SEBS基） | TPV |
|---|
| 交联 | 物理交联（微区） | 化学交联（硫化） |
| 压缩永久变形 | 中 | 低，回弹好 |
| 耐油 | 中 | 好 |
| 耐温 | 100℃ 级 | 120-135℃ 级 |
| 手感 | 软糯 | 略硬、橡胶感 |
| 价格 | 低 | 高 |
技术金句：TPE 和 TPV 的分界线，是“要不要长期顶着压还回弹”——密封条、减震件，TPV 更稳。
判据一 · 压缩永久变形：密封件的“考试题”
压缩永久变形还有一个“温度”维度：常温下 TPE 和 TPV 差距不大，100℃ 以上差距拉开——交联网络扛高温蠕变，物理交联扛不住。
选密封件料时，把“使用温度下的压变”数据要过来，别只看常温值。
密封件的命门是压缩永久变形：压变形之后，回不回得来。回不来，密封就失效。
- TPV 的优势：交联网络抵抗蠕变，压变形回弹率高——长期受压场景，TPV 明显占优；
- TPE 的短板：物理交联在高温长期受压下会蠕变，回弹下降——普通件没事，精密密封要小心。
测试标准（如 ISO 815）的温度、时间、压缩率要写清——同是“压缩永久变形 30%”，23℃ 和 125℃ 是两个完全不同的结论。
压变验收建议按 ISO 815、压缩率 25%、70℃×22h 取样，长期受压密封件把压缩永久变形压到 25% 以内；户外密封条另留氙灯 500h 后的色差与强度保留率。
判据二 · 耐油和耐温：TPV 的第二主场
TPV 的“耐油”要分介质：矿物油、机油、燃油，对 TPV 的侵蚀不同。
选型时把“接触什么油、多少度、多久”写清，供应商按实际介质给数据——泛泛的“耐油”，没法选料。
TPV 的“耐候”验证：户外密封条，氙灯老化 500-1000h 看色差和强度保留率。供应商给不出老化数据的，户外件别用——耐候不是口头承诺，是数据说话。
TPV 的“耐化学”清单：酸、碱、清洁剂、冷却液，不同介质对 TPV 的影响不同。把介质清单写进工况，供应商按清单给数据——泛泛的“耐化学”，没法选料。
TPV 的“老化”数据：耐臭氧、耐紫外是 EPDM 的底子，但不同牌号差异不小。要求供应商给“老化曲线”（不同时长数据点），比单点数据可靠。
TPV 的“应用”边界：耐温 135℃ 级，超过要换 TPEE 或橡胶。边界外硬用，短期没事长期老化——边界意识，是选型的底线。
TPV 的“提醒”：密封件的命门是压变，压变不过，一切都是白搭——先测压变，再谈其他。
TPV 的“临门一脚”：压变、老化、介质三项数据到手，再摸一次样品。样品手感和数据对齐，就可以拍板了——两手都要硬。
TPV 的“三补”：手感选 SEBS，密封选 TPV——先分岗位，再谈价格。
- 耐油：EPDM 硫化体系的耐油性优于充油 SEBS 体系——接触油液的密封件、软管，TPV 更稳；
- 耐温：TPV 连续使用温度通常 120-135℃ 级，比普通 SEBS 基 TPE 高一档——发动机舱、热水场景，TPV 是常客；
- 耐候：EPDM 本身耐候好，户外密封件、汽车外饰件 TPV 有优势。
判据三 · 工艺和成本：热塑性的效率，橡胶的性能
TPV 的“回收”要注意：TPV 是热塑性，可以回收，但回料的比例和性能下降要控制。
密封件厂回收水口时，建议按固定比例回掺并验证——回料不是不能用，是得管着用。
TPV 的核心价值是工艺红利：橡胶要硫化成型（慢），TPV 直接注塑/挤出（快），还能回收水口。对量产密封件，TPV 的效率优势和橡胶一样，成本却低一截。
| 场景 | 推荐 | 理由 |
|---|
| 汽车门窗密封条 | TPV | 耐候、压缩永久变形好 |
| 厨卫密封圈 | TPE/TPV | 按成本选 |
| 发动机舱管件 | TPV | 耐油耐温 |
| 一般包胶件 | TPE | 手感成本 |
三个问题定体系：压变、耐油、免硫化
TPV 的“牌号体系”：不同硬度、不同硫化体系，牌号五花八门。
TPV 的“认证”：汽车件要过主机厂标准，食品级要过食品接触认证。TPV 的认证要做在选型前——等订单来了补证，周期等不起。
TPV 的“加工窗口”：熔融温度高、粘度大，模具设计和注塑参数和普通 TPE 不同。换 TPV 先做工艺验证——参数不对，外观和尺寸全变。
TPV 的“模具设计”：收缩率、浇口位置、脱模斜度，和普通 TPE 不同。模具设计阶段把 TPV 的特性算进去——模具定型后再改，时间和钱都浪费。
TPV 的“颜色”稳定性：TPV 着色后长期使用变色，浅色件尤其明显。要求供应商给“耐光色牢度”数据——浅色 TPV 件，色牢度是隐性指标。
- 1. 问受压：长期受压回弹要求高吗？——高，TPV；
- 2. 问介质：接触油、高温吗？——接触，TPV；
- 3. 问成本：一般包胶件、不涉压不涉油？——TPE 更划算。
| 维度 | TPE | TPV | 判断 |
|---|
| 耐温 | 中 | 高 | 高温选TPV |
| 耐油 | 中 | 好 | 油选TPV |
| 价格 | 低 | 高 | 预算选TPE |
| 回弹 | 好 | 好 | 平手 |
科隆客户案例：回弹不足功能件不达标，跟产调试良率稳定
无锡一家汽车零部件厂，TPE/TPV 密封件回弹不足，功能件不达标。科隆配合现场跟产调试，良率稳定，气味等级通过客户验收标准。
回弹不达标的账，多半记在材料上，根子常在工艺上——先跟产，再换料。
小结
TPE 和 TPV 的选型三判据——受压回弹、耐油耐温、成本效率——对着问，方向就清楚。
TPE的选型判断，比料号本身更值钱，也更值得先花时间，别让选型成为量产前的坎。
TPV 的“打样验证”：密封件打样要按实际装配测试——装上、压紧、跑工况，别只看材料数据。实装测试过了，才能谈放量。
TPV 的“备选”牌号：密封件选型要留备选——主选牌号断货，备选能顶上。供应商给“同性能备选方案”的，合作起来心里有底。
TPV 的“一句话”：密封条选它，硫化是秘密——交联网络，是 TPV 的立身之本。
TPV 的“价格账”要算清：TPV 比 SEBS 基贵，但密封件寿命长、返修少。算总账（材料加返修加客诉），密封场景 TPV 往往更省——比价别只比单价。
TPV 的“供应商”选择：TPV 技术门槛高，国产、进口水平差距不小。看三样：硫化工艺稳定性、批次一致性、密封件案例——三样齐的，才敢谈长期合作。
TPV 的“应用扩展”：从汽车密封到家电、卫浴、工业件，TPV 的舞台在扩大。新应用先小批量验证，别直接上量——新场景的坑，小批阶段就能踩完。
TPV 的“成本优化”：TPV 贵，但可以混合 SEBS 基使用（按部位分选）。成本敏感的件用 TPE，关键密封用 TPV——组合方案，是成本和质量的中庸解。
The sealing strip is just acceptable with SEBS, but after three years it gets compressed and cannot return, causing air leakage. The difference between TPV and TPE lies entirely in compression set.
TPV's 'vulcanization' technology is its foundation: EPDM rubber undergoes dynamic vulcanization in PP, forming micron-sized crosslinked particles.
This process gives TPV the rebound of rubber and the processability of plastic— the word 'vulcanization' is the dividing line between TPV and ordinary TPE.
The 'appearance' difference between TPV and ordinary TPE: TPV has a rubber-like surface, while SEBS-based TPE has a more plastic-like feel. For over-molded parts, decide which texture you want first—if the texture is chosen incorrectly, the customer will return it as soon as they see it.
TPV's 'touch' tuning: TPV can be soft and resilient, but it feels different from the soft and smooth texture of SEBS. For seals, it doesn't matter much, but for overmolded parts (steering wheels, tool handles), it is important— in overmolded applications, you should first feel the sample before deciding on the system.
TPV's 'hardness range': TPV commonly has a Shore hardness of 40A-50D, which is somewhat narrower than that of SEBS-based materials. For parts that need to be extremely soft (00-20A), TPV may not be soft enough—in extremely soft scenarios, SEBS-based materials are more suitable.
The "weight" advantage of TPV: TPV is lighter than rubber, and weight reduction in seals is meaningful for vehicle fuel consumption and electric vehicle range. When it comes to lightweighting, TPV can do the math for customers—reducing weight means lowering costs.
The 'cost' structure of TPV: TPV is expensive due to the vulcanization process and crosslinking system. However, with long lifespan and few repairs for the seals, it is cost-effective in the overall accounting—compare lifespan before unit price.
Comparison of TPV: TPE focuses on touch, TPV focuses on oil resistance, TPEE focuses on fatigue—each of the three brothers handles their own area, choose according to the job.
The 'data' trilogy of TPV: compression-set curve, aging curve, and dielectric list — a TPV solution is only considered complete when all three are available.
The crosslinking degree of TPV is directly reflected in the compression set curve: variations in crosslinking degree between batches of the same grade can cause an 8-10% difference in compression set; during acceptance, consider the high-temperature compression set at 125℃×22h together, not just the room temperature value.
One-sentence conclusion: TPV is a 'vulcanized enhanced version' of TPE, making it more stable in sealing applications.
TPV (thermoplastic vulcanizate) is a special member of the TPE family: EPDM rubber is dynamically vulcanized in a PP matrix, forming cross-linked rubber microparticles.
It retains the thermoplastic properties of TPE (injectable and recyclable), while also obtaining the cross-linking properties of rubber (oil-resistant, heat-resistant, and good compression set).
| Dimension | TPE (SEBS-based) | TPV |
|---|
| Cross-linking | Physical crosslinking (microregion) | Chemical crosslinking (vulcanization) |
| Compression set | middle | Low, good rebound |
| Oil-resistant | middle | Good |
| Temperature resistant | 100℃ level | 120-135°C grade |
| hand feel | soft and glutinous | Slightly hard, rubbery |
| Price | Low | Tall |
Tech Tip: The dividing line between TPE and TPV is whether it can 'withstand long-term pressure and still rebound'—for sealing strips and shock-absorbing parts, TPV is more stable.
Criterion One · Compressive Permanent Deformation: The 'Exam Question' of Seals
Compression set also has a 'temperature' dimension: at room temperature, the difference between TPE and TPV is not significant, but above 100°C the gap widens—the crosslinked network resists high-temperature creep, while physical crosslinking cannot withstand it.
When selecting sealing material, make sure to get the 'compression set at operating temperature' data, not just the room temperature value.
The crucial point of a seal is permanent compression deformation: after it is compressed and deformed, can it return to its original shape. If it can't return, the seal fails.
- Advantages of TPV: The cross-linked network resists creep, and the compression deformation rebound rate is high — in long-term compression scenarios, TPV is significantly superior.
- The drawback of TPE: Physical crosslinking can creep under long-term high temperature pressure, leading to decreased rebound—ordinary parts are fine, but precision seals need to be careful.
The temperature, time, and compression rate according to test standards (such as ISO 815) should be clearly stated — even with the same '30% permanent compression deformation,' 23°C and 125°C are two completely different conclusions.
It is recommended that the compression set acceptance test be conducted according to ISO 815, with a compression rate of 25% and sampling at 70℃ for 22 hours. For long-term compressed seals, the permanent compression deformation should be kept within 25%; for outdoor sealing strips, additionally assess the color difference and strength retention after 500 hours of xenon lamp exposure.
Criterion Two · Oil and Heat Resistance: The Second Stronghold of TPV
The 'oil resistance' of TPV depends on the medium: mineral oil, engine oil, or fuel, which have different effects on TPV erosion.
When selecting a model, clearly specify 'what oil it will contact, at what temperature, and for how long'; the supplier will provide data based on the actual medium—vague terms like 'oil-resistant' make it impossible to choose the material.
TPV 'weather resistance' verification: For outdoor sealing strips, check color difference and strength retention after 500-1000 hours of xenon lamp aging. If the supplier cannot provide aging data, do not use it for outdoor components—weather resistance is not a verbal promise, the data speaks for itself.
TPV's 'chemical resistance' list: acids, bases, detergents, coolants; different media have different effects on TPV. Include the media list in the operating conditions, and the supplier provides data according to the list—vague 'chemical resistance' is not sufficient for material selection.
TPV 'aging' data: Ozone resistance and UV resistance are the foundation of EPDM, but there are significant differences between different grades. It is required that suppliers provide 'aging curves' (data points for different durations), which are more reliable than single-point data.
The 'application' boundary of TPV: temperature resistance up to 135℃; beyond that, switch to TPEE or rubber. Using it beyond the limit may work in the short term, but long-term aging occurs—the awareness of boundaries is the baseline for material selection.
TPV's 'reminder': The key of the seal lies in compression set. If the compression set is not acceptable, everything else is in vain—measure the compression set first, then discuss other matters.
TPV's 'final push': Once the three sets of data—pressure variation, aging, and dielectric—are in hand, touch the sample again. If the feel of the sample aligns with the data, a decision can be made—both hands need to be firm.
The 'three supplements' of TPV: choose SEBS for hand feel, choose TPV for sealing—first divide by role, then discuss the price.
- Oil resistance: The oil resistance of the EPDM vulcanization system is better than that of the oil-filled SEBS system—TPV is more stable for seals and hoses in contact with oil.
- Temperature resistance: TPV continuous use temperature is usually in the 120-135°C range, one level higher than ordinary SEBS-based TPE — in engine compartments and hot water scenarios, TPV is a regular choice;
- Weather resistance: EPDM itself has good weather resistance, while TPV has advantages in outdoor seals and automotive exterior parts.
Criterion Three · Process and Cost: Efficiency of thermoplastics, performance of rubber
Attention should be paid to the 'recycling' of TPV: TPV is thermoplastic and can be recycled, but the proportion of recycled material and the decline in performance need to be controlled.
When the seal factory recycles sprues, it is recommended to mix them back in at a fixed ratio and verify — recycled material is not unusable, it just needs to be properly controlled.
The core value of TPV is the process dividend: rubber needs vulcanization molding (slow), while TPV can be directly injection molded/extruded (fast), and the sprues can also be recycled. For mass-produced seals, TPV has the same efficiency advantage as rubber, but the cost is significantly lower.
| Scene | Recommend | Reason |
|---|
| Car door and window seals | TPV | Good weather resistance and permanent compression deformation |
| Kitchen and bathroom sealing ring | TPE/TPV | Select by cost |
| Engine compartment piping | TPV | Oil-resistant and temperature-resistant |
| General coated parts | TPE | Tactile cost |
Three issues define the system: compression set, oil resistance, non-vulcanization
The 'grade system' of TPV: different hardnesses, different vulcanization systems, with a wide variety of grades.
TPV's 'certification': automotive parts need to meet OEM standards, and food-grade ones need to pass food contact certification. TPV certification must be done before selection—waiting to supplement certification after receiving orders is too time-consuming.
The 'processing window' of TPV: high melting temperature, high viscosity, mold design and injection molding parameters are different from ordinary TPE. When switching to TPV, first perform process verification—if the parameters are incorrect, the appearance and dimensions will all change.
TPV's 'mold design': shrinkage rate, gate location, draft angle, are different from ordinary TPE. The characteristics of TPV should be considered during the mold design stage—if changes are made after the mold is set, both time and money are wasted.
Color stability of TPV: TPV tends to discolor over long-term use after coloring, especially for light-colored parts. Suppliers are required to provide 'light fastness' data — for light-colored TPV parts, color fastness is an implicit indicator.
- 1. Compression test: Are the rebound requirements high after long-term compression? — High, TPV;
- 2. Ask about the medium: Does it come into contact with oil or high temperatures? — It comes into contact, TPV;
- 3. Asking about cost: Generally for coated parts, not involving pressure or oil? — TPE is more cost-effective.
| Dimension | TPE | TPV | Judgment |
|---|
| Temperature resistant | middle | Tall | High-temperature selection TPV |
| Oil-resistant | middle | Good | Oil-extended TPV |
| Price | Low | Tall | Choose TPE for budget |
| rebound | Good | Good | Tie |
Cologne client case: rebounding insufficient functional parts fail to meet standards, stable yield during production commissioning
A car parts factory in Wuxi had insufficient rebound in TPE/TPV seals, and functional parts did not meet standards. Cologne cooperated on-site with production debugging, the yield stabilized, and the odor level met the customer's acceptance standards.
Accounts with substandard rebound are mostly recorded under materials, and the root cause is often in the process — first check the production, then change the materials.
Summary
The three criteria for selecting between TPE and TPV—compression set, oil and heat resistance, cost efficiency—pointing these questions in the right direction makes things clear.
The selection judgment of TPE is more valuable than the part number itself, and it is also worth spending time on first. Don’t let the selection become an obstacle before mass production.
TPV's 'sample verification': Seals need to be sampled and tested according to actual assembly—install them, tighten them, run operational conditions, don't just look at material data. Only after real assembly testing can we talk about mass production.
TPV's 'alternative' grades: Keep alternatives in mind when selecting seals—if the primary grade is out of stock, the alternative can take over. If the supplier provides an 'alternative with the same performance,' it gives peace of mind when working together.
TPV's 'one sentence': Choose it for sealing strips, vulcanization is the secret — the cross-linked network is the foundation of TPV.
The 'price account' of TPV needs to be calculated clearly: TPV is more expensive than SEBS, but the seals last longer and require fewer repairs. When calculating the total cost (materials plus repairs plus customer complaints), TPV is often more economical in sealing applications — don't just compare unit prices.
TPV's 'supplier' selection: TPV has high technical barriers, and there is a significant gap between domestic and imported levels. Look at three things: vulcanization process stability, batch consistency, and sealing case studies—only when all three are met will we dare to talk about long-term cooperation.
The "application extension" of TPV: from automotive sealing to home appliances, bathroom fixtures, and industrial parts, TPV's stage is expanding. New applications are first verified in small batches; don't go straight to mass production—the pitfalls of new scenarios can be encountered during the small batch phase.
TPV's 'cost optimization': TPV is expensive, but it can be mixed with SEBS-based materials (sorted by part). Cost-sensitive components use TPE, and critical seals use TPV—a combined solution, which is a moderate compromise between cost and quality.
