包胶件误用 TPV，粘不住还手感发硬。SEBS 管手感、TPV 管耐油耐温，按工况分家。
一句话结论：SEBS 管“手感”，TPV 管“耐油耐温”，按工况分家
SEBS 和 TPV 的“出身”不同：SEBS 是“橡胶味”的塑料，TPV 是“塑料味”的橡胶。出身决定性格——手感优先选 SEBS，密封优先选 TPV。
出身的“引申”：SEBS 的“橡胶味”是塑料的加工效率，TPV 的“塑料味”是橡胶的性能底子——一个要效率，一个要性能，按需取。
SEBS 的“韧性”：低温韧性好，-40℃ 不发脆。冬季用品、冷链件，SEBS 基稳——低温场景，先看 SEBS。
SEBS 的“加工”：注塑、挤出都成熟，周期短。TPV 加工窗口窄些——效率账，SEBS 有优势。
SEBS 的“食品级”：SEBS 基是食品级主力，认证逐牌号做。证书覆盖核清楚——覆盖不到，等于没有。
SEBS 的“医疗级”：无 DEHP、生物相容好。医疗项目选 SEBS 基，认证和体系都顺——但超软医疗件，验证要更细。
SEBS 的“配方”：充油量、分子量、助剂三样调手感。要软糯、要爽滑、要磨砂，SEBS 都能调——手感是 SEBS 的主场。
SEBS 的“批次”验证：硬度、回弹、表面三项留样。批次换了先对比——批次稳，客诉少。
SEBS 和 TPV 都是常用 TPE 体系，但基因不同：SEBS 是苯乙烯嵌段共聚物（充油调软），TPV 是 EPDM 动态硫化的交联体系。
体系对比的“提醒”：SEBS 和 TPV 不是谁取代谁，是各管一摊——手感件 SEBS，密封件 TPV。分工明确，选型才快。
| 维度 | SEBS 基 TPE | TPV |
|---|
| 手感 | 软糯细腻 | 偏橡胶感 |
| 压缩永久变形 | 中 | 好 |
| 耐油 | 中 | 好 |
| 耐温 | 100℃ 级 | 120-135℃ 级 |
| 价格 | 低 | 高 |
| 典型场景 | 包胶、日用品 | 密封、汽车件 |
技术金句：SEBS 和 TPV 的分工——“摸起来舒服”找 SEBS，“泡在油里稳”找 TPV。
包胶剥离力是手感件的硬指标：PP 基材配 SEBS 体系典型剥离力 1.0-2.0kN/m，低于 0.5kN/m 别量产；SEBS 超软件 Shore 00-20A 充油多，表面析出测试不能省。
判据一 · 手感和软度：SEBS 的主场
判据一的“实操”：把软度要求量化——Shore 多少、回弹多少、表面要滑还是磨砂。量化写进询价单，供应商才给得出对的数据——要求模糊，报价就模糊。
SEBS 基 TPE 的软度靠充油和分子量调节，可以从 Shore 00 做到 Shore 60A——包胶手柄、奶嘴、牙刷、日用品的手感，是 SEBS 的看家本领。
软度调节的“分寸”：充油多软但析出风险高。软和稳要平衡——超软件的析出测试，不能省。
SEBS 的“配色”：可透明、可彩色，外观自由度高。透明件、彩件优先 SEBS 基——颜色是卖点的产品，别省这个钱。
SEBS 的“超软”：Shore 00 档能做，母婴、个护的手感靠它。超软配方，验证要更细——软不是问题，稳才是。
SEBS 的“耐温”边界：长期 100℃ 级。高温场景（发动机舱、热水件），SEBS 不够——温度不够，就换体系。
SEBS 的“耐候”底子：氢化后无双键，户外件（鞋材、园艺工具）是稳的选择——耐候数据，选型时问供应商要。
SEBS 的“应用”地图：玩具、手柄、包胶、密封圈（非油场景）。地图上的场景，案例多——案例多的体系，踩坑少。
SEBS 的“供应”：SEBS 牌号多，现货备货足。急单项目，现货是硬指标——交期谈不拢，性能再好也白搭。
- 表面触感：细腻、干爽，可以调出亲肤感；
- 配色：易着色，彩色制品好做；
- 成本：原料便宜，量大件有优势。
判据二 · 耐油耐温和压变：TPV 的主场
判据二的“实操”：把介质清单列出来——机油、冷却液、清洁剂，每种接触多久、多少度。清单越细，测试越准——介质不清，数据白测。
TPV 的“耐油”验证：机油、润滑油浸泡测试，看体积变化和强度保留。耐油数据不过的，别拿“名义耐油”当结论。
TPV 的交联网络，带来三个硬指标：
TPV 的“耐候”：EPDM 底子，耐臭氧耐紫外。户外密封件，TPV 的老化数据是卖点——耐候报告，户外件必看。
TPV 的“密封”数据：压缩永久变形是命门。要“压变 30%”这种数据，先对齐温度时间条件——条件不同，数据不可比。
TPV 的“应用”地图：车窗密封、机舱密封、线缆护套。密封场景，TPV 是默认解——应用对位，选型不慌。
TPV 的“认证”：汽车件、户外件，认证各有要求。认证清单提前拉——补证周期，等不起。
TPV 的“硬度”档位：40A-50D 常用。选硬度先定档，再选牌号——档位错，手感全错。
TPV 的“耐候”：EPDM 底子耐臭氧耐紫外。户外密封件，老化数据是卖点——耐候报告，户外件必看。
- 压缩永久变形好：长期受压回弹好——密封件的命门；
- 耐油好：接触油液的密封、软管更稳；
- 耐温高：120-135℃ 级，发动机舱、热水场景更稳。
TPV 耐油看介质：机油浸泡看体积变化率，泡后体积变化超 10% 或强度保留低于 80% 就不行；密封件压变按 125℃×22h、压缩率 25% 验收。
| 场景 | SEBS 基 | TPV |
|---|
| 包胶手柄 | 优先 | 备选 |
| 日用品软件 | 优先 | 成本高 |
| 汽车密封条 | 备选 | 优先 |
| 耐油软管 | 备选 | 优先 |
| 食品级件 | 可选 | 可选 |
表格的“用法”：对照场景列，找到你的件在哪一行。行找到了，体系就定了——表格是捷径，不是终点。
判据三 · 成本和工艺：账要算总账
判据三的“实操”：把成本拆成单价、模具、效率、客诉四项。四项加起来才是总账——只比单价，最容易算错账。
两体系的“加工”：SEBS 基注塑效率高，TPV 窗口窄但稳。工艺成本，按产线算——效率差，也是成本差。
两体系的“收尾”：问手感、问介质、问成本——三问答完，体系就定了。
两体系的“别忘”：手感、介质、成本三问定体系，打样验证定牌号——两步走完，选型落地。
两体系的“补一句”：手感找 SEBS，密封找 TPV——一句话，选型定。
两个体系的“成本”定位：SEBS 基便宜，TPV 贵——但密封寿命长。成本账按“件”算，别按“吨”算。
两体系的“耐油”：SEBS 耐油一般，TPV 耐油好。接触油液的件（机舱密封），TPV 优先——介质决定体系。
两体系的“密封”场景：车窗密封、机舱密封用 TPV。密封数据（压变）先对齐条件——条件不同，数据不可比。
- 单价：SEBS 基便宜，TPV 贵——但密封件换 TPV 能降客诉；
- 工艺：两个体系都注塑/挤出，但 TPV 熔融粘度高、加工温度高——模具和工艺参数要按体系调；
- 批次：TPV 交联度批次控制更关键——选供应商要看品控。
三个问题定体系：手感、耐油、成本
决策树的“一问手感”：包胶手柄、玩具、母婴件，手感优先——SEBS 基。问完手感问介质，介质不清就是坑。
两体系的“应用”地图：密封条、线缆护套用 TPV；玩具、手柄、包胶用 SEBS 基。应用地图一画，选择就清楚——岗位分好，材料不吵。
两体系的“外观”：SEBS 基可透明彩色，TPV 以黑色灰色为主。外观要求高的件，SEBS 优先——颜色是卖点，别省。
- 1. 问手感：要软糯亲肤、多彩？——SEBS 基；
- 2. 问介质：接触油、高温、长期受压？——TPV；
- 3. 问成本：一般软件、不涉油不涉压？——SEBS 基更划算。
硬度验收每批留 6mm 试片、23℃ 测 Shore A，波动压在 ±3A 内；SEBS 低温 -40℃ 不发脆，TPV 耐候看氙灯 500h 后的强度保留。
SEBS 与 TPV 的选择，还要看耐油场景：SEBS 耐油一般，TPV 动态硫化后耐油耐温明显提升。
采购把介质写进工况，油品接触的件优先 TPV，成本多花一点，寿命长一截，总账反而划算。
| 维度 | SEBS | TPV | 判断 |
|---|
| 耐油 | 中 | 好 | 油选TPV |
| 耐温 | 中 | 高 | 高温选TPV |
| 价格 | 低 | 高 | 预算选SEBS |
| 包PP | 好 | 好 | 平手 |
| 场景 | 选谁 | 理由 |
|---|
| 油介质 | TPV | 耐油 |
| 日常包胶 | SEBS | 成本 |
| 高温 | TPV | 耐温 |
科隆客户案例：材料成本超标，重新匹配回到预算线
案例的“延伸”：材料成本超标，先看牌号是不是选宽了——按工况匹配，性价比才出得来。这个逻辑，包胶件、密封件都适用。
厦门一家改性料应用厂，SEBS/TPV 项目材料成本超标，报价没竞争力。科隆重新匹配包胶基材与加工温度，成本回到预算线内。
成本超标，先看牌号是不是选宽了——按工况匹配，性价比才出得来。
小结
收尾的“提醒”：本文判据只覆盖常见场景，特殊工况（极温、强介质、高疲劳）要单独验证——判据是起点，不是终点。
SEBS 和 TPV：问手感、问介质、问成本——三问答完，体系就定了。
别急着比较价格，先确认SEBS的工况清单是不是完整的，先对工况再对料。
有些生意我们不做。
Misusing TPV for coated parts causes it to stick and feels hard to the touch. SEBS pipes have a tactile feel, TPV pipes are oil- and temperature-resistant, divided by operating conditions.
One-sentence conclusion: SEBS pipes have a "feel," TPV pipes are "oil and temperature resistant," categorized by operating conditions
SEBS TPV and TPV have different "origins": SEBS is a "rubber-scented" plastic, TPV is a "plastic-scented" rubber. Background determines character — prioritize SEBS for hand feel, TPV for sealing.
's "extension": SEBS's "rubber flavor" is the processing efficiency of plastics, TPV's "plastic flavor" is the foundation of rubber's performance—one needs efficiency, the other performance, take as needed.
SEBS "toughness": good low-temperature toughness, no brittle at -40°C. Winter goods and cold chain parts, SEBS stable — for low-temperature scenarios, look at SEBS first.
SEBS "processing": injection molding and extrusion are mature, short cycles. TPV has a narrower processing window — efficiency — SEBS has an advantage.
SEBS "Food Grade": SEBS base is the main food-grade standard, with certification done by grade. Certification coverage is clear—if you can't cover it, it's as good as nothing.
SEBS "Medical Grade": No DEHP, good biocompatibility. For medical projects, choose SEBS base—both certification and system are smooth—but ultra-soft medical devices require more detailed verification.
SEBS "Formula": adjust the texture of oil content, molecular weight, and additives. Whether you want it soft, smooth, or matte, SEBS can be adjusted—feel is SEBS's main domain.
SEBS "Batch" verification: hardness, rebound, and surface sample retention. Compare batches first—batch stability, few customer complaints.
SEBS and TPV are commonly used TPE systems, but their genes differ: SEBS is a styrene block copolymer (oil-filled and softened), TPV is an EPDM dynamic vulcanized crosslinked system.
System Comparison's "reminder": SEBS and TPV are not about replacing the other; each has its own role—tactile parts like SEBS, seals like TPV. Clear division of labor makes selection faster.
| Dimension | SEBS base TPE | TPV |
|---|
| Tactile feel | Soft and delicate | Rubbery feel |
| Compression permanent deformation | Medium | Good |
| Oil resistant | Medium | Good |
| Temperature Resistance | 100°C Grade | 120-135°C Grade |
| Price | Low | High |
| Typical Scenarios | Overmolding, Daily Goods | Sealing, automotive parts |
Technical motto: The division between SEBS and TPV — "feels good to the touch" to find SEBS, "stable in oil" to find TPV.
Adhesive Peel Power is a hard metric for tactile feel parts: PP substrate paired with SEBS system typically has peel force of 1.0-2.0kN/m; below 0.5kN/m should not be mass-produced; SEBS Super Software Shore 00-20A has a lot of oil filling, so surface precipitation testing cannot be skipped.
Criterion One · Feel and Softness: SEBS's main domain
Criterion One's "Practice": Quantify softness requirements — how much shore, how much rebound, whether the surface should be smooth or matte. Only when quantified and written into the inquiry form can the supplier provide accurate data—if the requirements are vague, the quotation becomes ambiguous.
SEBS The softness of TPE is adjusted by oil filling and molecular weight, from Shore 00 to Shore 60A—the tactile feel of coated handles, pacifiers, toothbrushes, and daily necessities is SEBS's signature skill.
The "balance" of softness adjustment: the softer the oil, the higher the risk of precipitation. Balance between softness and stability—ultra-software precipitation testing, can't be skipped.
SEBS "Color schemes": transparent and colorable, offering high freedom in appearance. Transparent and colored parts are preferred. SEBS base—color is the selling point, don't skimp on that.
SEBS's "ultra-soft": Shore 00 level can do it, and the feel for mothers, babies, and personal care depends on it. Ultra-soft formula requires more detailed verification—softness is not the issue, stability is key.
SEBS "Temperature resistance" boundary: long-term 100°C level. High-temperature scenarios (engine bay, hot water parts): SEBS is insufficient—if temperature is insufficient, change the system.
SEBS "weather resistance" foundation: no double bonds after hydrogenation; outdoor parts (shoe materials, gardening tools) are stable choices—ask the supplier for weather resistance data when choosing.
SEBS "Application" map: toys, handles, rubber coating, sealing rings (non-oil scenarios). Scenarios on the map, many cases—systems with many cases fall into fewer pitfalls.
SEBS "Supply": SEBS grades are diverse, with ample stock in stock. For urgent orders, spot availability is a hard measure—if delivery dates are hard to negotiate, no matter how good the performance is, it's useless.
- Surface Touch: Delicate and dry, can create a skin-friendly feel;
- Color Matching: Easy to color, making colored products easy to make;
- Cost: Cheap raw materials, advantages for large quantities.
Criterion 2 · Oil resistance, temperature resistance, and pressure change: TPV's main domain
Criterion 2's "Practical": List the media list—engine oil, coolant, cleaning agent, how long and how to contact each type, and at what temperature. The more detailed the list, the more accurate the test—if the medium is unclear, the data is wasted.
TPV "oil resistance" verification: oil and lubricating oil soaking tests, observing volume changes and strength retention. If the oil resistance data is not good, don't use "nominal oil resistance" as a conclusion.
TPV cross-linked network provides three hard indicators:
TPV "weather resistance": EPDM base, ozone and UV resistance. For outdoor seals, TPV aging data is a selling point—weather resistance reports are a must-see for outdoor parts.
TPV "sealing" data: compression permanent deformation is the critical point. For data like "30% piezotransformer," first align with temperature and time conditions—different conditions mean data cannot be compared.
TPV "Application" map: window sealing, engine compartment sealing, cable sheaths. For sealing scenarios, TPV is the default solution—use alignment to choose without worry.
TPV "Certification": automotive parts and outdoor parts, each with its own requirements. Certification list is opened early—certification cycle is too late.
TPV "Hardness" range: 40A-50D is commonly used. Set the hardness level first, then select the grade—wrong level, all feel wrong.
TPV "Weather resistance": EPDM substrate is ozone and UV-resistant. For outdoor seals, aging data is a selling point—weather resistance reports, must-see for outdoor parts.
- Good permanent compression deformation: good rebound under long-term pressure—the lifeline of seals;
- Good oil resistance: more stable seals and hoses in contact with oil;
- High temperature resistance: 120-135°C level, more stable in engine compartments and hot water scenarios.
TPV Oil resistance depends on the medium: soak in engine oil by measuring volume change rate; if volume change exceeds 10% or strength retention is below 80%, it is not acceptable; Seal compression change is accepted at 125°C ×22h and compression rate 25%.
| Scenario | SEBS basis | TPV |
|---|
| Rubber-coated handle | Priority | Alternative |
| Daily necessities software | Priority | High cost |
| Car sealing strip | Alternative | Priority |
| Oil-resistant hose | Alternative | priority |
| food-grade parts | optional | optional |
Table "usage": Compare the scenario column to find which row your part is in. Once the line is found, the system is set—the table is a shortcut, not the endpoint.
Criterion 3 · Cost and process: accounting must be calculated as the total ledger
Criterion 3's "practice": break down costs into unit price, mold, efficiency, and customer complaint. Adding these four together forms the general ledger—only comparing unit prices is the easiest to miscalculate.
The "processing" of the two systems: SEBS-based injection molding has high efficiency, TPV has a narrow but stable window. Process cost, calculated by production line—poor efficiency is also a cost difference.
The "finishing" of the two systems: ask about feel, media, and cost—after these three Q&A, the system is set.
Don't forget' the two systems: three key systems: tactile feel, medium, and cost—sampling and verification, and finalizing the grade—two steps done, selection and implementation.
One extra note: for tactile feel, choose SEBS; for sealing, choose TPV—in short, choose the type.
The "cost" positioning of the two systems: SEBS base is cheap, TPV is expensive—but sealing life is long. Cost is calculated by "pieces," not by "tons."
"Oil resistance" of the two systems: SEBS has average oil resistance, TPV has good oil resistance. For parts that come into contact with oil (cabin seals), TPV is prioritized—the medium determines the system.
"Sealing" scenarios for both systems: TPV for window sealing and engine room sealing. Sealing data (transformer) should first be aligned with conditions—different conditions mean data cannot be compared.
- Unit price: SEBS base is cheap, TPV is expensive — but switching seals to TPV can reduce customer complaints;
- Process: Both systems are injection-molded/extrusion, but TPV has high melt viscosity and processing temperature—mold and process parameters must be adjusted according to the system;
- Batch: TPV crosslinking degree and batch control is more critical — choosing suppliers depends on quality control.
Three questions to set the system: hand feel, oil resistance, cost
The decision tree's "one question about feel": rubber handles, toys, mother-and-baby parts, tactile feel first—SEBS base. After asking about feel, ask about the medium; if the medium is unclear, it's a trap.
The "application" map of the two systems: TPV for sealing strips and cable sheaths; SEBS base for toys, handles, and overmolding. Once the application map is drawn, the choice is clear—job assignments are well organized, materials are quiet.
The "appearance" of the two systems: SEBS base can be transparent and colored, TPV mainly black and gray. For parts with high appearance requirements, SEBS is prioritized—color is the selling point, don't skimp.
- 1. Ask about the feel: should it be soft, glutinous, skin-friendly, and colorful? — SEBS base;
- 2. Ask about the medium: contact with oil, high temperatures, long-term pressure? ——TPV；
- 3. Cost question: General software, no oil or pressure? ——SEBS base is more cost-effective.
Hardness acceptance retains 6mm specimens per batch, 23°C Shore A test, fluctuating pressure within ±3A; SEBS does not become brittle at -40°C, TPV weather resistance is retained after 500 hours of xenon lamp strength.
SEBS Choosing between TPV and TPV also depends on oil resistance scenarios: SEBS has average oil resistance, TPV has significantly improved oil and temperature resistance after dynamic vulcanization.
Procurement Write the medium into the operating conditions, prioritize TPV for parts in oil contact, which costs a bit more, extends lifespan, and is actually more cost-effective.
| Dimension | SEBS | TPV | Judgment |
|---|
| Oil Resistance | Medium | Good | Oil Selection TPV |
| Temperature Resistance | Medium | High | High temperature choose TPV |
| Price | Low | High | Budget choose SEBS |
| Wrapped PP | Good | Good | Even |
| Scenario | WhoChoose | Reason |
|---|
| Oil Medium | TPV | Oil Resistance |
| Daily Overmolding | SEBS | Cost |
| High Temperature | TPV | TemperatureResistant |
Cologne Customer Case: Material cost exceeds the standard, rematch back to the budget line
Case "extension": Material cost exceeds the standard, first check if the grade is wider—matching according to operating conditions is the best value. This logic applies to both overmolding and sealing parts.
A modified material application factory in Xiamen has material costs exceeding the standard for SEBS/TPV projects, and the quotation is not competitive. Cologne rematched the overmolding base material and processing temperature, bringing the cost back within the budget line.
Cost exceeds the standard, first check if the grade is too wide—matching according to operating conditions is the best value for money.
Summary
Final "reminder": The criteria in this article only cover common scenarios; special working conditions (extreme temperature, strong media, high fatigue) must be verified separately—the criteria are the starting point, not the endpoint.
SEBS and TPV: ask about feel, medium, cost—after these three Q&A, the system is set.
Don't rush to compare prices; first confirm whether the SEBS operating condition list is complete, then check the operating conditions before the materials.
Some businesses we don't do are available
